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]
| 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 | |
References
edit- ^ a b c "NED results for UGC 8331". NED via University of California. Retrieved 2009-03-08.
- ^ a b I.D. Karachentsev; I.O. Drovdozsky (July 1998). "Distances to five resolved galaxies in the Canes Venatici cloud" (PDF). Astronomy and Astrophysics Supplement Series. Retrieved 2009-03-08.[permanent dead link]
- ^ a b 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. arXiv:0901.4222. Bibcode:2009A&A...493..871S. doi:10.1051/0004-6361:200810516. S2CID 14143255.