Astronomy:DDO 169
From HandWiki
| DDO 169 | |
|---|---|
 DDO 169 | |
| Observation data (J2000 epoch) | |
| Constellation | Canes Venatici |
| Right ascension | 13h 15m 30.31s |
| Declination | +47° 29′ 56.2″ |
| Redshift | +260 km/s |
| Distance | 6.03 / 8.23 Mpc[1][2] (19.7 / 26.8 million ly) |
| Apparent magnitude (V) | 14.61 |
| Characteristics | |
| Type | IAm |
| Apparent size (V) | 2.7′ × 0.9' |
| Other designations | |
| UGC 8331, PGC 46127 | |
DDO 169 (also known as UGC 8331) is an irregular galaxy located in the constellation Canes Venatici. It is a member of the M51 Group of galaxies and measures approximately 5 × 1.5 kiloparsecs (16,000 × 5,000 lightyears).[1] The galaxy's large-scale structure is very unorganized and it has two clusters of stars in its outer portions in addition to the cluster in the center.[3] These clusters make it practically impossible to determine the galaxy's rotation curve and contributes to a large variation in distance figures that are derived with different methods.[1][3] The exact distance to the galaxy is not known, although a 1998 paper estimated the distance as 8.23 megaparsecs.[2]
References
- ↑ 1.0 1.1 1.2 "NED results for UGC 8331". NED via University of California. http://nedwww.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=UGC+8331&extend=no&hconst=73&omegam=0.27&omegav=0.73&corr_z=1&out_csys=Equatorial&out_equinox=J2000.0&obj_sort=RA+or+Longitude&of=pre_text&zv_breaker=30000.0&list_limit=5&img_stamp=YES.
- ↑ 2.0 2.1 "Distances to five resolved galaxies in the Canes Venatici cloud". Astronomy and Astrophysics Supplement Series. July 1998. http://aas.aanda.org/index.php?option=article&access=standard&Itemid=129&url=/articles/aas/pdf/1998/13/ds7328.pdf.
- ↑ 3.0 3.1 R.A. Swaters; R. Sancisi; T.S. van Albada; J.M. van der Hulst (2009-01-27). "The rotation curves shapes of late-type dwarf galaxies". Astronomy and Astrophysics 493 (3): 871–892. doi:10.1051/0004-6361:200810516. Bibcode: 2009A&A...493..871S.
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