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Triangulum Galaxy
| Triangulum Galaxy | |
|---|---|
 Galaxy Messier 33 in Triangulum (the Triangulum Galaxy) | |
| Observation data (J2000 epoch) | |
| Pronunciation | /traɪˈæŋɡjʊləm/ |
| Constellation | Triangulum |
| Right ascension | 01h 33m 50.02s[1] |
| Declination | +30° 39′ 36.7″[1] |
| Redshift | -0.000607 ± 0.000010[1] |
| Heliocentric radial velocity | -179 ± 3 km/s[2] |
| Galactocentric velocity | -44 ± 6 km/s[2] |
| Distance | 970 kpc (3.2 Mly)[3] |
| Apparent magnitude (V) | 5.72[1] |
| Characteristics | |
| Type | SA(s)cd[2] |
| Mass | 5×1010[4] M☉ |
| Number of stars | 40 billion (4×1010)[6] |
| Size | 18.74 kpc (61,120 ly) (diameter; 25.0 mag/arcsec2 B-band isophote)[5][6] |
| Apparent size (V) | 70.8 × 41.7 arcminutes[1] |
| Other designations | |
| IRAS 01310+3024, NGC 598, UGC 1117, MCG +05-04-069, PGC 5818, CGCG 502-110[2] | |
The Triangulum Galaxy is a spiral galaxy 2.73 million light-years (ly) from Earth in the constellation Triangulum. It is catalogued as Messier 33 or NGC 598. With the D25 isophotal diameter of 18.74 kiloparsecs (61,100 light-years), the Triangulum Galaxy is the third-largest member of the Local Group of galaxies, behind the Andromeda Galaxy and the Milky Way.
The galaxy is the second-smallest spiral galaxy in the Local Group after the Large Magellanic Cloud, which is a Magellanic-type spiral galaxy.[7] It is believed to be a satellite of the Andromeda Galaxy or on its rebound into the latter due to their interactions, velocities,[8] and proximity to one another in the night sky. It also has an H II nucleus.[9]
- ^ a b c d e Cite error: The named reference
SIMBAD-M33was invoked but never defined (see the help page). - ^ a b c d Cite error: The named reference
nedwas invoked but never defined (see the help page). - ^ Cite error: The named reference
vivianwas invoked but never defined (see the help page). - ^ Cite error: The named reference
mnras342_1was invoked but never defined (see the help page). - ^ De Vaucouleurs, Gerard; De Vaucouleurs, Antoinette; Corwin, Herold G.; Buta, Ronald J.; Paturel, Georges; Fouque, Pascal (1991). Third Reference Catalogue of Bright Galaxies. Bibcode:1991rc3..book.....D.
- ^ a b Cite error: The named reference
michonwas invoked but never defined (see the help page). - ^ Ryden, Barbara; Peterson, Bradley M. (2010). Foundations of astrophysics. San Francisco: Addison-Wesley. ISBN 978-0-321-59558-4.
- ^ Cite error: The named reference
science307_5714was invoked but never defined (see the help page). - ^ Ho, Luis C.; Filippenko, Alexei V.; Sargent, Wallace L. W. (October 1997). "A Search for Dwarf Seyfert Nuclei. III. Spectroscopic Parameters and Properties of the Host Galaxies". The Astrophysical Journal Supplement Series. 112 (2): 315–390. arXiv:astro-ph/9704107. Bibcode:1997ApJS..112..315H. doi:10.1086/313041. ISSN 0067-0049. S2CID 17086638.
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