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Line 229:
| 5 February 2002
| April 2018
| Deorbited on April 20, April 2023
|-
 
Line 624:
! 11
| [[Explorer 11]] (S 15)
| April 27, April 1961
| [[Juno II]]
| 37
| LEO
| November 17, November 1961
| In orbit
| Gamma ray astronomy<ref>{{cite web |url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1961-013A |title=NASA - NSSDCA - Spacecraft |publisher=National Space Science Data Center |date=2017-03-21 |access-date=2018-04-20}} {{PD-notice}}</ref>
Line 635:
! style="background:#fbb;"| –
| [[S-45A]]
| May 25, May 1961
| [[Juno II]]
| 34
Line 646:
! style="background:#fbb;"| –
| [[S-55 (satellite)]] (Meteoroid Satellite-A, Micrometeorite Explorer)
| June 30, June 1961
| [[Scout (rocket)|Scout X-1]]
| 85
Line 657:
! 12
| [[Explorer 12|EPE-A]] (S 3, Energetic Particle Explorer-A)
| August 16, August 1961
| [[Thor-Delta]]
| 38
| HEO
| December 6, December 1961
| September 1, September 1963
| Energetic particle research<ref>{{cite web |url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1961-020A |title=NASA - NSSDCA - Spacecraft |publisher=National Space Science Data Center |access-date=2018-04-20}} {{PD-notice}}</ref>
|- style="background: #ffb;"
Line 668:
! style="background: #FFB;" | 13
| [[Explorer 13]] (S-55A)
| August 25, August 1961
| [[Scout X-1]]
| 86
| LEO
| August 28, August 1961
| August 28, August 1961
| Micrometeoroid research; partial failure<ref>{{cite web |url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1961-022A |title=NASA - NSSDCA - Spacecraft |publisher=National Space Science Data Center |access-date=2018-04-20}} {{PD-notice}}</ref>
|-
Line 679:
! 14
| [[Explorer 14|EPE-B]] (Energetic Particle Explorer-B)
| October 2, October 1962
| [[Delta A]]
| 40
| HEO
| August 11, August 1963
| July 1, July 1966
| Energetic particle research<ref>{{cite web |url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1962-051A |title=NASA - NSSDCA - Spacecraft |publisher=National Space Science Data Center |access-date=2018-04-20}} {{PD-notice}}</ref>
|-
Line 690:
! 15
| [[Explorer 15|EPE-C]] (S-3B, Energetic Particle Explorer-C)
| October 27, October 1962
| [[Delta A]]
| 44
| HEO
| January 30, January 1963
| January 15, January 1978
| Energetic particle research<ref>{{cite web |url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1962-059A |title=NASA - NSSDCA - Spacecraft |publisher=National Space Science Data Center |date=2017-03-21 |access-date=2018-04-20}} {{PD-notice}}</ref>
|-
Line 701:
! 16
| [[Explorer 16|S-55B]]
| December 16, December 1962
| [[Scout (rocket)|Scout X-3]]
| 101
| LEO
| July 22, July 1963
| In orbit
| Micrometeoroid research<ref>{{cite web |url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1962-070A |title=NASA - NSSDCA - Spacecraft |publisher=National Space Science Data Center |access-date=2018-04-20}} {{PD-notice}}</ref>
Line 712:
! 17
| [[Explorer 17|AE-A (S-6, Atmosphere Explorer-A)]]
| April 3, April 1963
| [[Delta B]]
| 184
| LEO
| July 10, July 1963
| November 24, November 1966
| Atmospheric research<ref>{{cite web |url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1963-009A |title=NASA - NSSDCA - Spacecraft |publisher=National Space Science Data Center |access-date=2018-04-20}} {{PD-notice}}</ref>
|-
Line 723:
! 18
| [[Explorer 18|IMP-A]] (IMP 1, Interplanetary Monitoring Platform-A)
| November 27, November 1963
| [[Delta C]]
| 138
| HEO
| May 10, May 1965
| December 30, December 1965
| Magnetospheric research<ref>{{cite web |url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1963-046A |title=NASA - NSSDCA - Spacecraft |publisher=National Space Science Data Center |access-date=2018-04-20}} {{PD-notice}}</ref>
|-
Line 734:
! 19
| [[Explorer 19|AD-A (Atmospheric Density-A)]]
| December 19, December 1963
| [[Scout (rocket)|Scout X-4]]
| 8
| LEO
| May 10, May 1981
| May 10, May 1981
| Atmospheric density measurements<ref>{{cite web |url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1963-053A |title=NASA - NSSDCA - Spacecraft |publisher=National Space Science Data Center |date=2017-03-21 |access-date=2018-04-20}} {{PD-notice}}</ref>
|- style="background:#fbb;"
Line 745:
! style="background:#fbb;"| –
| BE-A ([[Beacon Explorer-A]], S-66A)
| March 19, March 1964
| [[Delta B]]
| 114
Line 756:
! 20
| [[Explorer 20|IE-A]] (S 48, TOPSI, Ionosphere Explorer-A)
| August 25, August 1964
| [[Scout (rocket)|Scout X-4]]
| 45
| LEO
| December 29, December 1965
| In orbit
| Ionosphere research<ref>{{cite web |url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1964-051A |title=NASA - NSSDCA - Spacecraft |publisher=National Space Science Data Center |access-date=2018-04-20}} {{PD-notice}}</ref>
Line 767:
! 21
| [[Explorer 21|IMP-B]] (IMP 2, Interplanetary Monitoring Platform-B)
| October 4, October 1964
| [[Delta C]]
| 135
| HEO
| October 13, October 1965
| January 30, January 1966
| Magnetospheric research<ref>{{cite web |url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1964-060A |title=NASA - NSSDCA - Spacecraft |publisher=National Space Science Data Center |access-date=2018-04-20}} {{PD-notice}}</ref>
|-
Line 778:
! 22
| [[Explorer 22|BE-B]] (Beacon Explorer-B, S-66B)
| October 10, October 1964
| [[Scout (rocket)|Scout X-4]]
| 53
Line 789:
! 23
| [[Explorer 23|S 55C]]
| November 6, November 1964
| [[Scout (rocket)|Scout X-4]]
| 134
| LEO
| November 7, November 1965
| June 29, June 1983
| Micrometeoric research<ref>{{cite web |url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1964-074A |title=NASA - NSSDCA - Spacecraft |publisher=National Space Science Data Center |access-date=2018-04-20}} {{PD-notice}}</ref>
|-
Line 800:
! 24
| [[Explorer 24|AD-B]] (Atmospheric Density-B)
| November 21, November 1964
| [[Scout (rocket)|Scout X-4]]
| 9
| MEO
| October 18, October 1968
| October 18, October 1968
| Atmospheric density measurements<ref>{{cite web |url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1964-076A |title=NASA - NSSDCA - Spacecraft |publisher=National Space Science Data Center |access-date=2018-04-20}} {{PD-notice}}</ref>
|-
Line 811:
! 25
| [[Injun (satellite)|Injun 4]] (IE-B, Ionosphere Explorer-B)
| November 21, November 1964
| [[Scout (rocket)|Scout X-4]]
| 40
Line 822:
! 26
| [[Explorer 26|EPE-D (Energetic Particle Explorer-D)]]
| December 21, December 1964
| [[Delta C]]
| 46
| MEO
| December 27, December 1967
| August 23, August 2021
| High energy particle observations<ref>{{cite web |url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1964-086A |title=NASA - NSSDCA - Spacecraft |publisher=National Space Science Data Center |access-date=2018-04-20}} {{PD-notice}}</ref>
|-
Line 833:
! 27
| [[Explorer 27|BE-C (Beacon Explorer-C, S-66C)]]
| April 29, April 1965
| [[Scout (rocket)|Scout X-4]]
| 61
| LEO
| July 20, July 1973
| In orbit
| Magnetospheric research<ref>{{cite web |url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1965-032A |title=NASA - NSSDCA - Spacecraft |publisher=National Space Science Data Center |access-date=2018-04-20}} {{PD-notice}}</ref>
Line 844:
! 28
| [[Explorer 28|IMP-C]] (IMP 3, Interplanetary Monitoring Platform-C)
| May 29, May 1965
| [[Delta C]]
| 128
| HEO
| May 12, May 1967
| July 4, July 1968
| Magnetospheric research<ref>{{cite web |url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1965-042A |title=NASA - NSSDCA - Spacecraft |publisher=National Space Science Data Center |access-date=2018-04-20}} {{PD-notice}}</ref>
|-
Line 855:
! 29
| [[Explorer 29|GEOS 1]] (GEOS-A, Geodetic Earth Orbiting Satellite-1)
| November 6, November 1965
| [[Delta E]]
| 387
| LEO
| June 23, June 1978
| In orbit
| Geodetic Earth monitoring<ref>{{cite web |url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1965-089A |title=NASA - NSSDCA - Spacecraft |publisher=National Space Science Data Center |date=2017-03-21 |access-date=2018-04-20}} {{PD-notice}}</ref>
Line 866:
! 30
| [[Solrad 8|SOLRAD 8]] (SE-A)
| November 19, November 1965
| [[Scout (rocket family)|Scout X-4]]
| 57
| LEO
| November 5, November 1967
| In orbit
| Solar radiation monitoring (Cover for covert [[Signals intelligence|ELINT]] mission)<ref>{{cite web |url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1965-093A |title=NASA - NSSDCA - Spacecraft |publisher=National Space Science Data Center |access-date=2018-04-20}} {{PD-notice}}</ref>
Line 877:
! 31
| [[Explorer 31|DME-A]] (Direct Measurements Explorer)
| November 29, November 1965
| [[Thor-Agena]] B
| 99
| LEO
| October 1, October 1969
| In orbit
| Ionospheric research<ref>{{cite web|url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1965-098B |title=NASA - NSSDCA - Spacecraft - Details |publisher=National Space Science Data Center |access-date=2018-04-20}}</ref>
Line 888:
! 32
| [[Explorer 32|AE-B (Atmosphere Explorer-B)]]
| May 25, May 1966
| [[Delta C]]1
| 225
| LEO
| March 1967
| February 22, February 1985
| Atmospheric research<ref>{{cite web|url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1966-044A |title=NASA - NSSDCA - Spacecraft - Details |publisher=National Space Science Data Center |date=2017-03-21 |access-date=2018-04-20}}</ref>
|-
Line 899:
! 33
| [[Explorer 33|IMP-D (AIMP 1, Interplanetary Monitoring Platform-D)]]
| July 1, July 1966
| [[Delta E]]1
| 212
| HEO
| September 21, September 1971<ref>{{cite web| url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1966-058A| title=Explorer 33 (NSSDC ID: 1966-058A)| publisher=NASA / National Space Science Data Center| date=2008-04-02| access-date=2008-07-04}}</ref>
| In orbit
| Magnetospheric research
Line 910:
! 34
| [[Explorer 34|IMP-F]] (IMP 4, Interplanetary Monitoring Platform-F)
| May 24, May 1967
| [[Delta E]]1
| 163
| MEO
| May 3, May 1969
| May 3, May 1969
| Magnetospheric research<ref>{{cite web|url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1967-051A |title=NASA - NSSDCA - Spacecraft - Details |publisher=National Space Science Data Center|access-date=2018-04-20}}</ref>
|-
Line 921:
! 35
| [[Explorer 35|IMP-E (AIMP 2, Interplanetary Monitoring Platform-E)]]
| July 19, July 1967
| [[Delta E]]1
| 230
| [[Lunar orbit|Lunar]]
| June 24, June 1973
| Lunar orbit
| Magnetospheric research<ref>{{cite web|url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1967-070A |title=NASA - NSSDCA - Spacecraft - Details |publisher=National Space Science Data Center |access-date=2018-04-20}}</ref>
Line 932:
! 36
| [[GEOS 2]] (GEOS-B, Geodetic Earth Orbiting Satellite-2)
| January 11, January 1968
| [[Delta E]]1
| 469
| LEO
| July 1, July 1982
| In orbit
| Geodetic Earth monitoring<ref>{{cite web|url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1968-002A |title=NASA - NSSDCA - Spacecraft - Details |publisher=National Space Science Data Center |date=2017-03-21 |access-date=2018-04-20}}</ref>
Line 943:
! 37
| [[SOLRAD 9]] (SE B)
| March 5, March 1968
| [[Scout B]]
| 198
| LEO
| April 30, April 1974
| November 16, November 1990
| Solar radiation monitoring<br>(Cover for covert [[ELINT]] mission)<ref>{{cite web|url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1968-017A |title=NASA - NSSDCA - Spacecraft - Details |publisher=National Space Science Data Center|access-date=2018-04-20}}</ref>
|-
Line 954:
! 38
| [[Explorer 38|RAE-A (RAE 1, Radio Astronomy Explorer-A)]]
| July 4, July 1968
| [[Delta J]]
| 602
Line 965:
! 39
| [[Explorer 39|AD-C]] (Atmospheric Density-C)
| August 8, August 1968
| [[Scout B]]
| 9
| LEO
| June 23, June 1971
| June 22, June 1981
| Atmospheric density measurements<ref>{{cite web|url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1968-066A |title=NASA - NSSDCA - Spacecraft - Details |publisher=National Space Science Data Center |date=2017-03-21 |access-date=2018-04-20}}</ref>
|-
Line 976:
! 40
| [[Injun (satellite)|Injun 5]] (Injun C, IE-C, Ionosphere Explorer-C)
| August 8, August 1968
| [[Scout B]]
| 71
Line 987:
! 41
| [[Explorer 41|IMP-G]] (IMP 5, Interplanetary Monitoring Platform-G)
| June 21, June 1969
| [[Delta E]]1
| 145
| HEO
| December 23, December 1972
| December 23, December 1972
| Magnetospheric research<ref>{{cite web|url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1969-053A |title=NASA - NSSDCA - Spacecraft - Details |publisher=National Space Science Data Center |access-date=2018-04-20}}</ref>
|-
Line 998:
! 42
| [[Uhuru (satellite)|Uhuru]] (SAS-A, SAS 1)
| December 12, December 1970
| [[Scout B]]
| 142
| LEO
| January 4, January 1975
| April 5, April 1979
| X-ray astronomy<ref>{{cite web|url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1970-107A |title=NASA - NSSDCA - Spacecraft - Details |publisher=National Space Science Data Center |access-date=2018-04-20}}</ref>
|-
Line 1,009:
! 43
| [[Explorer 43|IMP-H]] (IMP 7, Interplanetary Monitoring Platform-H)
| March 13, March 1971
| [[Delta M]]6
| 635
| MEO
| October 2, October 1974
| October 2, October 1974
| Magnetospheric research<ref>{{cite web|url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1971-019A |title=NASA - NSSDCA - Spacecraft - Details |publisher=National Space Science Data Center |access-date=2018-04-20}}</ref>
|-
Line 1,020:
! 44
| [[SOLRAD 10]] (SE-C, SOLRAD-C)
| July 8, July 1971
| [[Scout B]]
| 260
| LEO
| June 30, June 1973
| December 15, December 1979
| Solar radiation monitoring<br>(Cover for covert [[ELINT]] mission)<ref>{{cite web|url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1971-058A |title=NASA - NSSDCA - Spacecraft - Details |publisher=National Space Science Data Center |date=2017-03-21 |access-date=2018-04-20}}</ref>
|-
Line 1,031:
! 45
| [[Explorer 45|SSS-A]] (S-Cubed A)
| November 15, November 1971
| [[Scout B]]
| 52
| MEO
| September 30, September 1974
| January 10, January 1992
| Magnetospheric research<ref>{{cite web |url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1971-096A |title=NASA - NSSDCA - Spacecraft - Details |publisher=National Space Science Data Center |access-date=2018-04-20 }}</ref>
|-
Line 1,042:
! 46
| MTS ([[Meteoroid Technology Satellite]], METEC)<ref>{{cite web|url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1972-061A |title=NASA - NSSDCA - Spacecraft - Details |website=National Space Science Data Center |date=2016-02-12 |access-date=2016-02-24}}</ref>
| August 13, August 1972
| [[Scout (rocket)|Scout D-1]]
| 90
| LEO
| November 4, November 1974
| November 2, November 1979
| Micrometeoroids research<ref>{{cite web|url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1972-061A |title=NASA - NSSDCA - Spacecraft - Details |publisher=National Space Science Data Center |date=2017-03-21 |access-date=2018-04-20}}</ref>
|-
Line 1,053:
! 47
| [[Explorer 47|IMP-I]] (IMP 6, Interplanetary Monitoring Platform-I)
| September 23, September 1972
| [[Delta 1000|Delta 1604]]
| 635
| HEO
| October 31, October 1978
| In orbit
| Magnetospheric research<ref>{{cite web|url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1972-073A |title=NASA - NSSDCA - Spacecraft - Details |publisher=National Space Science Data Center |access-date=2018-04-20}}</ref>
Line 1,064:
! 48
| [[Second Small Astronomy Satellite|SAS-B (Small Astronomy Satellite-B, SAS 2)]]
| November 15, November 1972
| [[Scout (rocket)|Scout D-1]]
| 166
| LEO
| June 8, June 1973
| August 20, August 1980
| X-ray astronomy<ref>{{cite web|url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1972-091A |title=NASA - NSSDCA - Spacecraft - Details |publisher=National Space Science Data Center |access-date=2018-04-20}}</ref>
|-
Line 1,075:
! 49
| [[Explorer 49|RAE-B (RAE 2, Radio Astronomy Explorer-B)]]
| June 10, June 1973
| [[Delta 1000|Delta 1913]]
| 328
| [[Lunar orbit|Lunar]]
| April 26, April 1977
| Presumed crashed into Moon sometime after August 1977<ref name="explorer49nssdc"/>
| Radio astronomy<ref name="explorer49nssdc">{{cite web|url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1973-039A|title=NASA - NSSDCA - Spacecraft - Details |publisher=National Space Science Data Center |access-date=2018-04-20}}</ref>
Line 1,086:
! 50
| [[Explorer 50|IMP-J]] (IMP 8, Interplanetary Monitoring Platform-J)
| October 26, October 1973
| [[Delta 1000|Delta 1604]]
| 371
| HEO
| October 7, October 2006
| In orbit
| Magnetospheric research<ref>{{cite web|url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1973-078A |title=NASA - NSSDCA - Spacecraft - Details |publisher=National Space Science Data Center |access-date=2018-04-20}}</ref>
Line 1,097:
! 51
| [[Explorer 51|AE-C]] (Atmosphere Explorer-C)
| December 16, December 1973
| [[Delta 1000|Delta 1900]]
| 658
| LEO
| (December 12, December 1978)
| December 12, December 1978
| Atmospheric research<ref>{{cite web|url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1973-101A |title=NASA - NSSDCA - Spacecraft - Details |publisher=National Space Science Data Center |date=2017-03-21 |access-date=2018-04-20}}</ref>
|-
Line 1,108:
! 52
| [[Explorer 52|Hawkeye 1]] (Injun-F, Injun 6, IE-D, Ionosphere Explorer-D)
| June 3, June 1974
| [[Scout (rocket)|Scout E-1]]
| 23
| HEO
| April 28, April 1978
| April 28, April 1978
| Magnetospheric research<ref>{{cite web|url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1974-040A |title=NASA - NSSDCA - Spacecraft - Details |publisher=National Space Science Data Center |access-date=2018-04-20}}</ref>
|-
Line 1,119:
! 53
| [[Third Small Astronomy Satellite|SAS-C (Small Astronomy Satellite-C, SAS 3)]]
| May 7, May 1975
| [[Scout (rocket)|Scout F-1]]
| 197
| LEO
| April 7, April 1979
| April 9, April 1979
| X-ray astronomy<ref>{{cite web|url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1975-037A |title=NASA - NSSDCA - Spacecraft - Details |publisher=National Space Science Data Center |date=2017-03-21 |access-date=2018-04-20}}</ref>
|-
Line 1,130:
! 54
| [[Explorer 54|AE-D]] (Atmosphere Explorer-D)
| October 6, October 1975
| [[Delta 2000|Delta 2910]]
| 681
| LEO
| January 29, January 1976
| March 12, March 1976
| Atmospheric research<ref>{{cite web|url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1975-096A |title=AE-D |publisher=National Space Science Data Center |access-date=2018-04-20}}</ref>
|-
Line 1,141:
! 55
| [[Explorer 55|AE-E]] (Atmosphere Explorer-E)
| November 20, November 1975
| [[Delta 2000|Delta 2910]]
| 735
| LEO
| September 25, September 1980
| June 10, June 1981
| Atmospheric research<ref>{{cite web|url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1975-107A |title=AE-E |publisher=National Space Science Data Center |access-date=2018-04-20}}</ref>
|- style="background:#fbb;"
Line 1,152:
! style="background:#fbb;"| —
| [[Dual Air Density Explorer|DADE-A]] (Dual Air Density Explorer-A)
| December 5, December 1975
| [[Scout (rocket)|Scout F-1]]
| 40
Line 1,163:
! style="background:#fbb;"| —
| [[Dual Air Density Explorer|DADE-B]] (Dual Air Density Explorer-B)
| December 5, December 1975
| [[Scout (rocket)|Scout F-1]]
| 43
Line 1,174:
! 56
| [[ISEE-1]] (ISEE-A)
| October 22, October 1977
| [[Delta 2000|Delta 2914]]
| 340
| HEO
| September 26, September 1987
| September 26, September 1987
| Magnetospheric research; launched with ESA's [[ISEE-2]]; co-mission with ISEE 3<ref>{{cite web|url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1977-102A |title=ISEE 1 |publisher=NASA - NSSDCA |access-date=2018-04-20}}</ref>
|-
Line 1,185:
! 57
| [[International Ultraviolet Explorer|IUE]]
| January 26, January 1978
| [[Delta 2000|Delta 2914]]
| 669
| MEO
| September 30, September 1996
| In orbit
| Ultraviolet astronomy<ref>{{cite web|url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1978-012A |title=IUE |publisher=NASA - NSSDCA |access-date=2018-04-20}}</ref>
Line 1,196:
! 58
| [[Heat Capacity Mapping Mission|HCMM]] (AEM-A)
| April 26, April 1978
| [[Scout (rocket)|Scout F]]
| 117
| LEO
| September 30, September 1980
| December&nbsp;22, 1981
| Thermal mapping of the Earth<ref>{{cite web|url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1978-041A |title= HCMM |publisher=NASA - NSSDCA |access-date=2018-04-20}}</ref>
Line 1,207:
! 59
| [[International Cometary Explorer|ICE]] (ISEE 3, ISEE-C)
| August 12, August 1978
| [[Delta 2000|Delta 2914]]
| 390
| [[Lissajous orbit|Sun–Earth L<sub>1</sub>]]
| September 16, September 2014
| [[Heliocentric orbit]]
| Magnetospheric research; heliocentric mission, re-purposed in 1982 as a cometary probe (renamed International Cometary Explorer). First spacecraft to be placed at a libration point, and first one to perform a flyby of a comet.<ref>{{cite web|url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1978-079A |title= ISEE 3 |publisher=NASA - NSSDCA |access-date=2018-04-20}}</ref><ref name="space-timeline" />
Line 1,218:
! 60
| [[Stratospheric Aerosol and Gas Experiment|SAGE]] (AEM-B)
| February 18, February 1979
| [[Scout (rocket)|Scout D-1]]
| 149
| LEO
| January 7, January 1982
| April 11, April 1989
| Stratospheric aerosol and ozone data<ref>{{cite web |url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1979-013A |title= SAGE |publisher=NASA - NSSDCA |access-date=2018-04-20 }}</ref>
|-
Line 1,229:
! 61
| [[Magsat|MAGSAT]] (AEM-C)
| October 30, October 1979
| [[Scout (rocket)|Scout G-1]]
| 158
| LEO
| May 6, May 1980
| June 11, June 1980
| Mapped the near surface magnetic field of the Earth<ref>{{cite web|url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1979-094A |title=Magsat |publisher=NASA - NSSDCA |access-date=2018-04-20}}</ref>
|-
Line 1,262:
! 64
| [[Solar Mesosphere Explorer|SME]]
| October 6, October 1981
| [[Delta (rocket)|Delta 2310]]
| 145
| LEO
| April 4, April 1989
| March 5, March 1991
| Atmospheric research<ref>{{cite web |url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1981-100A |title= SME |publisher=NASA - NSSDCA |access-date=2018-04-20 |url-status=live |archive-url=https://web.archive.org/web/20200404213307/https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1981-100A |archive-date= 4 April 2020 }}</ref>
|-
Line 1,284:
! 66
| [[Cosmic Background Explorer|COBE]]
| November 18, November 1989
| [[Delta (rocket)|Delta 5920]]
| 2,206
| LEO
| December 23, December 1993
| In orbit
| Microwave astronomy<ref>{{cite web|url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1989-089A |title=NASA - NSSDCA - Spacecraft - Details |publisher=Nssdc.gsfc.nasa.gov |access-date=2018-04-20}}</ref>
Line 1,295:
! 67
| [[Extreme Ultraviolet Explorer|EUVE]] (BERKSAT)
| June 7, June 1992
| [[Delta II]] 6920-X
| 3,275
| LEO
| January 31, January 2001
| January 30, January 2002
| Ultraviolet astronomy<ref>{{cite web|url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1992-031A |title=NASA - NSSDCA - Spacecraft - Details |publisher=Nssdc.gsfc.nasa.gov |access-date=2018-04-20}}</ref>
|-
Line 1,306:
! 68
| [[Solar Anomalous and Magnetospheric Particle Explorer|SAMPEX]]
| July 3, July 1992
| [[Scout (rocket)|Scout G-1]]
| 158
| LEO
| June 30, June 2004<ref>{{cite web|url=http://www.srl.caltech.edu/sampex/DataCenter/ |title=The SAMPEX Data Center |website=Srl.caltech.edu |access-date=2016-02-24}}</ref>
| November 13, November 2012.<ref>{{cite web |url=http://www.aerospace.org/cords/reentry-predictions/upcoming-reentries/1992-038a/ |archive-url=https://archive.today/20130224130248/http://www.aerospace.org/cords/reentry-predictions/upcoming-reentries/1992-038a/ |url-status=dead |archive-date=2013-02-24 |title=SAMPEX &#124; The Aerospace Corporation |website=Aerospace.org |access-date=2016-02-24 }}</ref>
| SMEX: magnetospheric research<ref>{{cite web|url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1992-038A |title=NASA - NSSDCA - Spacecraft - Details |publisher=Nssdc.gsfc.nasa.gov |access-date=2018-04-20}}</ref>
|-
Line 1,317:
! 69
| [[Rossi X-ray Timing Explorer|RXTE]]
| December 30, December 1995
| [[Delta II]] 7920
| 3,200
| LEO
| January 3, January 2012
| April 30, April 2018<ref>{{cite web |last=Reddy |first=Francis |url=https://phys.org/news/2018-05-nasa-rossi-x-ray-explorer-scientific.html |title=Nasa's Rossi X-ray Timing Explorer leaves scientific legacy |website=[[Phys.org]] |date=2018-05-04 |access-date=2019-02-18}}</ref>
| MIDEX: X-ray astronomy<ref>{{cite web |url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1995-074A |title=NASA - NSSDCA - Spacecraft - Details |publisher=Nssdc.gsfc.nasa.gov |date=2017-03-21 |access-date=2018-04-20 }}</ref>
|-
Line 1,328:
! 70
| [[Fast Auroral Snapshot Explorer|FAST]]
| August 21, August 1996
| [[Pegasus XL]]
| 187
| LEO
| May 4, May 2009
| In orbit
| SMEX: auroral phenomena<ref>{{cite web|url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1996-049A |title=NASA - NSSDCA - Spacecraft - Details |publisher=Nssdc.gsfc.nasa.gov |access-date=2018-04-20}}</ref>
Line 1,339:
! style="background:#fbb;"| —
| [[High Energy Transient Explorer|HETE 1]]
| November 4, November 1996
| [[Pegasus XL]]
| 128
| LEO
| —
| April 7, April 2002
| Separation failure, mission relaunched as HETE 2<ref>{{cite web|url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1996-061A |title=NASA - NSSDCA - Spacecraft - Details |publisher=Nssdc.gsfc.nasa.gov |date=2017-03-21 |access-date=2018-04-20}}</ref>
|- style="background:#bfb;"
Line 1,350:
! style="background:#bfb;"| 71
| [[Advanced Composition Explorer|ACE]]
| August 25, August 1997
| [[Delta II]] 7920
| 596
Line 1,361:
! 72
| [[Student Nitric Oxide Explorer|SNOE]]
| February 26, February 1998
| [[Pegasus XL]]
| 120
| LEO
| December 13, December 2003
| December 13, December 2003
| STEDI, UNEX: atmospheric research<ref>{{cite web |url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1998-012A |title=NASA - NSSDCA - Spacecraft - Details |publisher=Nssdc.gsfc.nasa.gov |access-date=2018-04-20 }}</ref>
|-
Line 1,372:
! 73
| [[TRACE]]
| April 2, April 1998
| [[Pegasus XL]]
| 250
| LEO
| June 21, June 2010<ref>{{cite web|url=http://trace.lmsal.com/ |title=< Welcome to T R A C E on-line > |website=Trace.lmsal.com |date=2010-06-21 |access-date=2016-02-24}}</ref> <!-- (Hibernation) ({{For year month day| year=1998 | month=04 | day=02}}) -->
| In orbit
| SMEX: solar observatory<ref>{{cite web |url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1998-020A |title=NASA - NSSDCA - Spacecraft - Details |publisher=Nssdc.gsfc.nasa.gov |date=2017-03-21 |access-date=2018-04-20 }}</ref>
Line 1,383:
! 74
| [[Submillimeter Wave Astronomy Satellite|SWAS]]
| December 6, December 1998
| [[Pegasus XL]]
| 288
| LEO
| September 1, September 2005 <!-- (hiberation) -->
| In orbit
| SMEX: submillimeter astronomy<ref>{{cite web|url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1998-071A |title=NASA - NSSDCA - Spacecraft - Details |publisher=Nssdc.gsfc.nasa.gov |access-date=2018-04-20}}</ref>
Line 1,394:
! style="background: #FFB;" | 75
| [[Wide Field Infrared Explorer|WIRE]]
| March 5, March 1999
| [[Pegasus XL]]
| 250
| [[Sun-synchronous orbit|SSO]]
| September 30, September 2000<ref>{{cite web |url=http://spider.ipac.caltech.edu/staff/laher/asteroseismology/wireobs2.html |title=Complete WIRE Star-Camera Observation History |publisher=Spider.ipac.caltech.edu |access-date=2018-04-20 |archive-date=6 August 2020 |archive-url=https://web.archive.org/web/20200806214243/http://spider.ipac.caltech.edu/staff/laher/asteroseismology/wireobs2.html |url-status=dead }}</ref>
| May 10, May 2011<ref>{{cite web|author=WIRE Web Team |url=http://www.ipac.caltech.edu/wire/ |title=WIRE: The Wide Field Infrared Explorer |website=Ipac.caltech.edu |access-date=2016-02-24}}</ref>
| SMEX, Infrared astronomy, primary mission failed due to loss of coolant<ref>{{cite web |url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1999-011A |title=NASA - NSSDCA - Spacecraft - Details |publisher=Nssdc.gsfc.nasa.gov |date=2017-03-21 |access-date=2018-04-20 }}</ref>
|- style="background:#fbb;"
Line 1,405:
! style="background:#fbb;"| 76
| TERRIERS
| May 18, May 1999
| [[Pegasus XL]]
| 120
| Polar LEO
| May 18, May 1999
| In orbit
| STEDI: atmospheric research, satellite failed shortly after achieving orbit<ref>{{cite web|url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1999-026A |title=NASA - NSSDCA - Spacecraft - Details |publisher=Nssdc.gsfc.nasa.gov |access-date=2018-04-20}}</ref>
Line 1,416:
! 77
| [[Far Ultraviolet Spectroscopic Explorer|FUSE]]
| June 23, June 1999
| [[Delta II]] 7320
| 1,400
| LEO
| October 18, October 2007
| In orbit
| MIDEX: ultraviolet astronomy<ref>{{cite web|url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1999-035A |title=NASA - NSSDCA - Spacecraft - Details |publisher=Nssdc.gsfc.nasa.gov |access-date=2018-04-20}}</ref>
Line 1,427:
! 78
| [[IMAGE (spacecraft)|IMAGE]]
| March 25, March 2000
| [[Delta II]] 7326
| 536
| Polar MEO
| December 18, December 2005<ref>{{cite web|url=http://image.gsfc.nasa.gov/ |title=NASA - IMAGE Science Center |website=Image.gsfc.nasa.gov |access-date=2016-02-24}}</ref>
| In orbit
| MIDEX: magnetospheric research<ref>{{cite web|url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=2000-017A |title=NASA - NSSDCA - Spacecraft - Details |publisher=Nssdc.gsfc.nasa.gov |access-date=2018-04-20}}</ref>
Line 1,438:
! 79
| [[High Energy Transient Explorer|HETE-2]]
| October 9, October 2000
| [[Pegasus (rocket)|Pegasus-H]]
| 124
| LEO
| March 28, March 2007<ref>{{cite web |url=https://science.nasa.gov/missions/hete-2/ |title=Missions - HETE-2 - NASA Science |website=Science.nasa.gov |access-date=2016-02-24 |archive-date=22 July 2016 |archive-url=https://web.archive.org/web/20160722132241/http://science.nasa.gov/missions/hete-2/ |url-status=dead }}</ref>
| In orbit
| MO: UV, X-ray, and gamma ray astronomy<ref>{{cite web|url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=2000-061A |title=NASA - NSSDCA - Spacecraft - Details |publisher=Nssdc.gsfc.nasa.gov |date=2017-03-21 |access-date=2018-04-20}}</ref>
Line 1,449:
! 80
| [[WMAP]]
| June 30, June 2001
| [[Delta II]] 7425-10
| 840
Line 1,460:
! 81
| [[RHESSI]]
| February 5, February 2002
| [[Pegasus XL]]
| 230
| LEO
| August 16, August 2018
| Deorbited
| SMEX: X-ray and gamma ray solar flare imaging<ref>{{cite web|url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=2002-004A |title=NASA - NSSDCA - Spacecraft - Details |publisher=Nssdc.gsfc.nasa.gov |access-date=2018-04-20}}</ref>
Line 1,472:
! style="background:#bfb;"| —
| [[INTEGRAL]]
| October 17, October 2002
| [[Proton-K]] [[Blok D|Blok DM-2]]
| 4,000
Line 1,483:
! 82
| [[CHIPSat]]
| January 13, January 2003
| [[Delta II]] 7320-10
| 60
| LEO
| April 11, April 2008<ref>{{cite web|last=Savage |first=Sam |url=http://www.redorbit.com/news/space/1417075/chipsat_quietly_shut_down/ |title=CHIPSat Quietly Shut Down |website=Redorbit.com |date=2008-06-04 |access-date=2016-02-24}}</ref>
| In orbit
| UNEX: ultraviolet spectroscopy and astronomy<ref>{{cite web|url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=2003-002B |title=NASA - NSSDCA - Spacecraft - Details |publisher=Nssdc.gsfc.nasa.gov |access-date=2018-04-20}}</ref>
Line 1,494:
! 83
| [[GALEX]]
| April 28, April 2003
| [[Pegasus XL]]
| 280
| LEO
| June 28, June 2013<ref>{{cite web|url=http://www.galex.caltech.edu/newsroom/glx2013-03r.html |title=Press Release: NASA Decommissions Its Galaxy Hunter Spacecraft |website=Galex.caltech.edu |date=2013-06-28 |access-date=2016-02-24}}</ref>
| In orbit
| SMEX: ultraviolet astronomy<ref>{{cite web|url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=2003-017A |title=NASA - NSSDCA - Spacecraft - Details |publisher=Nssdc.gsfc.nasa.gov |date=2017-03-21 |access-date=2018-04-20}}</ref>
Line 1,505:
! style="background:#bfb;"| 84
| [[Neil Gehrels Swift Observatory|Swift]]
| November 20, November 2004
| [[Delta II]] 7320-10C
| 1,470
Line 1,516:
! —
| [[Suzaku (satellite)|Suzaku]] (Astro E2)
| July 10, July 2005
| [[M-V]]
| 1,706
| LEO
| September 2, September 2015
| In orbit
| MO: instrument on JAXA's Suzaku mission<ref>{{cite web|url=https://heasarc.gsfc.nasa.gov/docs/astroe/astroegof.html |title=HEASARC: Suzaku Guest Observer Facility |publisher=Heasarc.gsfc.nasa.gov |access-date=2018-04-28}}</ref>
Line 1,527:
! style="background:#bfb;"| —
| [[TWINS]] A
| June 28, June 2006
| [[Delta IV]] M+(4,2)
| ''classified''
Line 1,538:
! style="background:#bfb;"| 85
| [[THEMIS (satellite)|THEMIS]] A
| February 17, February 2007
| [[Delta II]] 7925
| 77
Line 1,548:
! style="background:#bfb;"| 86
| [[THEMIS (satellite)|THEMIS]] B (ARTEMIS P1)
| February 17, February 2007
| [[Delta II]] 7925
| 77
Line 1,558:
! style="background:#bfb;"| 87
| [[THEMIS (satellite)|THEMIS]] C (ARTEMIS P2)
| February 17, February 2007
| [[Delta II]] 7925
| 77
Line 1,568:
! style="background:#bfb;"| 88
| [[THEMIS (satellite)|THEMIS]] D
| February 17, February 2007
| [[Delta II]] 7925
| 77
Line 1,578:
! style="background:#bfb;"| 89
| [[THEMIS (satellite)|THEMIS]] E
| February 17, February 2007
| [[Delta II]] 7925
| 77
Line 1,589:
! 90
| [[Aeronomy of Ice in the Mesosphere|AIM]]
| April 25, April 2007
| [[Pegasus XL]]
| 197
Line 1,600:
! style="background:#bfb;"| —
| [[TWINS]] B
| March 13, March 2008
| [[Atlas V]] 411
| ''classified''
Line 1,611:
! —
| [[CINDI]]
| April 16, April 2008
| [[Pegasus XL]]
| 395
| LEO
| November 28, November 2015
| November 28, November 2015
| MO: instruments on [[C/NOFS]]
 
Line 1,622:
! style="background:#bfb;"| 91
| [[Interstellar Boundary Explorer|IBEX]]
| October 19, October 2008
| [[Pegasus XL]]
| 107
Line 1,633:
! 92
| [[Wide-field Infrared Survey Explorer|WISE]]
| December 14, December 2009
| [[Delta II]] 7320
| 661
Line 1,644:
! style="background:#bfb;"| 93
| [[Nuclear Spectroscopic Telescope Array|NuSTAR]]
| June 13, June 2012
| [[Pegasus XL]]
| 350
Line 1,655:
! style="background:#bfb;"| 94
| [[Interface Region Imaging Spectrograph|IRIS]]
| June 27, June 2013
| [[Pegasus XL]]
| 183
Line 1,666:
! —
| [[Hitomi (satellite)|Hitomi]] (NeXT, ASTRO-H)
| February 7, February 2016
| [[H-2A]]-202
| 2,700
| LEO
| March 26, March 2016
| In orbit
| MO: X-ray instrument on JAXA's Hitomi, but spacecraft failed after initial checkouts<ref>{{cite web|url=http://global.jaxa.jp/press/2016/03/20160327_hitomi.html |title=JAXA &#124; Communication anomaly of X-ray Astronomy Satellite "Hitomi" (ASTRO-H) |publisher=Global.jaxa.jp |access-date=2018-04-28}}</ref>
Line 1,677:
! style="background:#bfb;"| —
| [[NICER]]
| May 3, May 2017
| [[Falcon 9]] FT
| 372
Line 1,688:
! style="background:#bfb;"| —
| [[Global-scale Observations of the Limb and Disk|GOLD]]
| January 25, January 2018
| [[Ariane 5]] ECA
| 37
Line 1,699:
! style="background:#bfb;"| 95
| [[Transiting Exoplanet Survey Satellite|TESS]]
| April 18, April 2018
| [[Falcon 9]] FT
| 362
Line 1,710:
! style="background:#bfb;"| 96
| [[Ionospheric Connection Explorer|ICON]]
| October 11, October 2019
| [[Pegasus (rocket)|Pegasus]] XL
| 287
Line 1,721:
! style="background:#bfb;"| 97
| [[IXPE]]
| December 9, December 2021
| [[Falcon 9]] Block 5
| 330
Line 1,732:
! style="background:#bfb;"| —
| [[X-Ray Imaging and Spectroscopy Mission|XRISM]]
| September 6, September 2023
| [[H-IIA]] 202
| 2,300
Line 1,745:
[[File:Thor-Able III Explorer 6.jpg|thumb|right|200px|[[Explorer 6]] on a [[Thor-Able|Thor-Able III]] launch in August 1959]]
[[File:ISEE-C (ISEE 3) in dynamic test chamber.jpg|thumb|200px|right|ISEE-C in a dynamic test chamber, 1978]]
Many missions are proposed, but not selected. For example, in 2011, the Explorers Program received 22 full missions solicitations, 20 Missions of Opportunity, and 8 USPI.<ref>{{cite web|url=http://explorers.larc.nasa.gov/EX/ |title=Science Office for Mission Assessments: Explorer 2011 |website=Explorers.larc.nasa.gov |access-date=2016-02-24}}</ref> <!-- Missions of Opportunity (MO) are small collaborative missions with spacecraft not operated by NASA, such as an additional instrument. Examples of this include [[Astro-H]], [[CINDI]], [[TWINS]], and [[HETE-2]]. -->Sometimes mission are only partially developed but must be stopped for financial, technological, or bureaucratic reasons. Some missions failed upon reaching orbit including WIRE and TERRIERS.{{fact}}
 
Examples of missions that were not developed or cancelled were:<ref name=skyrocket/>
Line 1,800:
 
==References==
{{reflist|colwidth=30em}}
 
==External links==
Retrieved from "https://en.wikipedia.org/wiki/Explorers_Program"