Utente:Paperoastro/Sandbox3: differenze tra le versioni
Contenuto cancellato Contenuto aggiunto
NGC 6/20 |
Nessun oggetto della modifica |
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Riga 49:
|nomi = [[New General Catalogue|NGC]] 20, [[Uppsala General Catalogue|UGC]] 84, [[Morphological Catalogue of Galaxies|MCG]] +05-01-036, [[2MASS|2MASX]] J00093270+3318310, [[Principal Galaxies Catalogue|PGC]] 679
}}
'''NGC
==Storia delle osservazioni==
NGC 20 fu scoperta il [[18 settembre]] [[1857]] da [[William Parsons]] con un [[telescopio]] [[telescopio riflettore|riflettore]] da 72 [[pollice (unità di misura)|pollici]] (182,9 [[centimetro|cm]]). Nel [[1888]] [[John Dreyer]] la incluse nel [[catalogo NGC]] con il nome di NGC 20 e la descrisse come una debole galassia. Dreyer annotò inoltre la presenza di una [[stella]] di decima magnitudine apparentemente attaccata all'oggetto<ref name="ngc">{{en}} {{cita libro
| autore=J.L.E. Dreyer | wkautore=John Dreyer
| titolo=New general catalogue of nebulæ and clusters of stars (1888) - Index catalogue (1895) - Second index catalogue (1908)
| url=http://www.ngcicproject.org/legacy/ngconline/default.htm | formato=jpg | datadiaccesso=2010-01-24
| annooriginale=1888 | anno=1962 | editore=Memoirs of the Royal Astronomical Society | città=Londra | pagine=14
}}</ref>.
(Lo stesso oggetto fu osservato)
L'oggetto identificato inizialmente come NGC 6 fu osservato la notte del [[20 settembre]] [[1885]] da [[Lewis Swift]].
Oltre ad esso, Swift osservò quella notte
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NGC 6 = NGC 20. On the night of 20 September 1885, Lewis Swift found▼
six objects. Four of these (NGC 19, NGC 21, NGC 7831, and NGC 7836; see the▼
notes for these, too) have mean offsets in their positions as published by▼
Swift, from the correct positions, of +1m 10s in RA and +8m 08s in Dec. A▼
fifth found later in the night, NGC 801, has offsets of -19s and -0.9m; Swift▼
clearly ``re-zeroed'' his telescope in the interim.▼
Found by Swift (List #2 on 20 Sept 1885) but his position was 1.1 tmin W and 47'
Riga 77 ⟶ 97:
--
▲NGC 6 = NGC 20. On the night of 20 September 1885, Lewis Swift found
▲six objects. Four of these (NGC 19, NGC 21, NGC 7831, and NGC 7836; see the
▲notes for these, too) have mean offsets in their positions as published by
▲Swift, from the correct positions, of +1m 10s in RA and +8m 08s in Dec. A
▲fifth found later in the night, NGC 801, has offsets of -19s and -0.9m; Swift
▲clearly ``re-zeroed'' his telescope in the interim.
The sixth object, NGC 6, shares the right ascension offsets of the first four,
Riga 127 ⟶ 140:
== Altri progetti ==
{{interprogetto|commons=Category:NGC
==Collegamenti esterni==
{{LinksNGC|
{{NavNGC|6}}{{NavNGC|20}}
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