Triangelgalaxen
Triangelgalaxen | |
![]() Messier 33 (M33) | |
Observationsdata | |
---|---|
Stjärnbild | Triangeln[1] |
Rektascension | 01t 33m 50.9s[2] |
Deklination | +30° 39′ 37″[2] |
Avstånd | drygt tre miljoner[1] ljusår |
Typ | SA(s)cd[2] |
Skenbar storlek | 70,8' × 41,7'[2] |
Skenbar magnitud | 6,27[2] |
Andra beteckningar | |
NGC 0598, UGC 01117, CGCG 502-110, CGCG 0131.0+3024, MCG +05-04-069, 2MASX J01335090+3039357, IRAS 01310+3024, IRAS F01310+3024, LDCE 0160 NED001, PGC 005818, RBS 0214, UZC J013351.1+303922, 11HUGS 027, NVSS J013351+303933, HIJASS J0133+30, ChASeM33F 318, ChASeM33F J013350.89+303936.6, ChASeM33 200, CXO J013350.9+303936, CXO J013351.0+303937, RX J0133.8+3039, 1RXS J013350.9+303932, 2XMM J013350.8+303937, 2XMMp J013350.8+303937, 1XMM J013350.9+303937, 1AXG J013351+3039, 1ES 0131+303, CXO J013350.91+303936.7, MESSIER 033:[LDC81] 08, MESSIER 033:[TFP88] X-08, [SPB93] 026, LGG 011:[G93] 002, MESSIER 033:[SB95] 16, [MHH96] J013351+303959, MESSIER 033:[LCB96] 28, NGC 0598:[RPS97] 21, [M98j] 104 NED02, RX J0133.8+3039:[BEV98] 004, MESSIER 033:[GDK99] 102, MESSIER 033:[HP2001] 102, MESSIER 033:[PMH2004] 211, NGC 0598:[FK2005] 03, NGC 0598:[LM2005] ULX01, MESSIER 033:[MPH2006] 182, [BWC2008] U02, NGC 0598:[L2011a] X0001[2] | |
Se även: Galaxer, Lista över galaxer |
Triangelgalaxen[1] är en spiralgalax i stjärnbilden Triangeln.[1] Den är den näst närmaste stora galaxen till Vintergatan och är den tredje största medlemmen av Lokala galaxhopen.[1]
Den observerades av Charles Messier i augusti 1764, men upptäcktes troligen redan hundra år tidigare av Giovanni Battista Hodierna.[1] Under mycket goda förhållanden kan triangelgalaxen ses med blotta ögat och anses vara det mest avlägsna himmelska objektet som kan ses utan optiska hjälpmedel.[1]
I triangelgalaxen finns nebulosan NGC 604. Den har en diameter på närmare 1500 ljusår och är en av de största kända emissionsnebulosorna.[1]
Triangelgalaxen närmar sig Vintergatan med en hastighet på 100 000 km/h.[1]
Referenser
|
|
|
Media som används på denna webbplats
M33, the Triangulum Galaxy, is a perennial favorite of amateur and professional astronomers alike, due to its orientation and relative proximity to us. It is the second nearest spiral galaxy to our Milky Way (after M31, the Andromeda Galaxy) and a prominent member of the "local group" of galaxies. From our Milky Way perspective, M33's stellar disk appears at moderate inclination, allowing us to see its internal structure clearly, whereas M31 is oriented nearly edge-on.
The Galaxy Evolution Explorer imaged M33 as it appears in ultraviolet wavelengths. Ultraviolet imaging primarily traces emission from the atmospheres of hot stars, most of which formed in the past few hundred million years. These data provide a reference point as to the internal composition of a typical star-forming galaxy and will help scientists understand the origin of ultraviolet emission in more distant galaxies.
These observations of M33 allow astronomers to compare the population of young, massive stars with other components of the galaxy, such as interstellar dust and gas, on the scale of individual giant molecular clouds. The clouds contain the raw material from which stars form. This presents direct insight into the star formation process as it occurs throughout an entire spiral galaxy and constitutes a unique resource for broader studies of galaxy evolution.