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== Launch, trajectory, and orbit ==

[[Image:WMAP orbit.jpg|thumb|WMAP's orbit and sky scan strategy]]

The satellite's orbit at Lagrange 2, (1.5 million kilometers from Earth) minimizes the amount of contaminating solar, terrestrial, and lunar emissions registered, and to thermally stabilize it. To view the entire sky, without looking to the sun, the WMAP orbits around L2 in a [[Lissajous orbit]] ca. 1.0 degree to 10 degrees,<ref name="2003Bennett" /> with a 6-month period.<ref name="news_facts" /> The telescope rotates once every 2 minutes, 9 seconds" (0.464 rpm) and processes at the rate of 1 revolution per hour.<ref name="2003Bennett" /> WMAP measures the entire sky every six months, and completed its first, full-sky observation in April 2002.<ref name="news_events" />

[[File:Orbita WMAP.png|thumb|The WMAP's trajectory and orbit.]]

<nowiki>==Lancio, traiettoria e orbita==</nowiki>

The WMAP satellite arrived at the Kennedy Space Center on 20 April 2001, was tested for two months, mounted atop a Delta II 7425 rocket, and fired to outer space on 30 June 2001.<ref name="2008Limon" /><ref name="news_facts" /> It began operating on its internal power five minutes before its launching, and so continued operating until the solar panel array deployed. The WMAP was activated and monitored while it cooled. On 2 July, it began working, first with in-flight testing (from launching 'til 17 August), then began constant, formal work.<ref name="2008Limon" /> Afterwards, it effected three Earth-Moon phase loops, measuring its [[sidelobe]]s, then flew by the Moon on 30 July, enroute to the the L2 Sun-Earth [[Lagrangian point]], arriving there on 1 October 2001, becoming, thereby, the first CMB observation mission permanently posted there.<ref name="news_facts" />

[[ImageFile:Orbita WMAP orbit.jpgpng|thumb|WMAP'sTraiettoria orbite andorbita skydel scan strategyWMAP]]

Il WMAP, una volta completata la sua costruzione, è arrivato al [[John F. Kennedy Space Center]] il [[20 aprile]] [[2001]], dopodichè, dopo un test durato 2 mesi, è stato spedito in orbita tramite un razzo ''Delta II 7425'' il [[30 giugno]] [[2001]].<ref name="2008Limon" /><ref name="news_facts" /> La sonda ha iniziato ad usare la propria scorta di energia interna da 5 minuti prima del lancio fino al completo dispiegamento del pannello solare. L'attivazione completa della sonda, e il suo monitoraggio, sono partiti al raggiungimento della temperatura di raffreddamento operativa. Dopodichè, la sonda ha effettuato 3 [[loop]] graduali tra la [[Terra]] e la [[Luna]] quindi, il [[30 luglio]], ha iniziato il viaggio verso il [[Punti di Lagrange|punto di Lagrange]] L2 Sole-Terra, raggiungendolo in data [[1º ottobre]] [[2001]]. In questo modo, il WMAP è diventato il primo satellite per la scansione della radiazione di fondo a trovarsi permanentemente in tale punto.<ref name="news_facts" />

The satellite's orbit at Lagrange 2, (1.5 million kilometers from Earth) minimizes the amount of contaminating solar, terrestrial, and lunar emissions registered, and to thermally stabilize it. To view the entire sky, without looking to the sun, the WMAP orbits around L2 in a [[Lissajous orbit]] ca. 1.0 degree to 10 degrees,<ref name="2003Bennett" /> with a 6-month period.<ref name="news_facts" /> The telescope rotates once every 2 minutes, 9 seconds" (0.464 rpm) and processes at the rate of 1 revolution per hour.<ref name="2003Bennett" /> WMAP measures the entire sky every six months, and completed its first, full-sky observation in April 2002.<ref name="news_events" />

== Foreground radiation subtraction ==