NGC 2805 is a intermediate spiral galaxy in the constellation of Ursa Major. Its velocity with respect to the cosmic microwave background is 1834 ± 7 km/s, which corresponds to a Hubble distance of 27.05 ± 1.90 Mpc (∼88.2 million light-years).[1] However, 11 non redshift measurements give a distance of 12.76 ± 11.89 Mpc (41.6 million light-years).[2] (Note: this sample of measurements is inconsistent: seven values between 3.03 Mpc and 5.13 Mpc are reported in publications from 1984 to 1985, then four values between 26.8 Mpc and 28.8 Mpc.) The galaxy was discovered by German-British astronomer William Herschel on 2 April 1791.[3]
| NGC 2805 | |
|---|---|
 The intermediate spiral galaxy NGC 2805, imaged by the Hubble Space Telescope. | |
| Observation data (J2000 epoch) | |
| Constellation | Ursa Major |
| Right ascension | 09h 20m 20.41s[1] |
| Declination | +64° 06′ 10.0″[1] |
| Redshift | 0.005779 [1] |
| Heliocentric radial velocity | 1733 ± 1 km/s[1] |
| Distance | 88.2 ± 6.2 Mly (27.05 ± 1.90 Mpc)[1] |
| Apparent magnitude (V) | 11.0[1] |
| Characteristics | |
| Type | SAB(rs)d[1] |
| Size | ~90,800 ly (27.84 kpc) (estimated)[1] |
| Apparent size (V) | 6.3' x 4.8'[1] |
| Other designations | |
| PGC 26410, UGC 4936, CGCG 312-002, MCG +11-12-003, IRAS 09162+6418, 2MASX J09202040+6406099[1] | |
One supernova has been observed in NGC 2805: SN 2019hsw (type II, mag. 15.4).[4]
NGC 2805 Group
editNGC 2805 is the namesake of the NGC 2805 group (also known as LGG 173), which includes at least 4 other galaxies: NGC 2814, NGC 2820, NGC 2880, and IC 2458.[5] This group, minus NGC 2880, are also collectively called Holmberg 124.[6]
See also
editReferences
edit- ^ a b c d e f g h i j k "NASA/IPAC Extragalactic Database". Results for NGC 2805. Retrieved 15 August 2024.
- ^ "Distance Results for NGC 2805". NASA/IPAC EXTRAGALACTIC DATABASE. NASA. Retrieved 15 August 2024.
- ^ Seligman, Courtney. "NGC 2805". Celestial Atlas. Retrieved 15 August 2024.
- ^ "SN 2019hsw". Transient Name Server. IAU. Retrieved 15 August 2024.
- ^ Garcia, A. M. (1993). "General study of group membership. II. Determination of nearby groups". Astronomy and Astrophysics Supplement Series. 100: 47. Bibcode:1993A&AS..100...47G.
- ^ Holmberg, Erik (1937). "A Study of Double and Multiple Galaxies Together with Inquiries into some General Metagalactic Problems". Annals of the Observatory of Lund. 6: 1. Bibcode:1937AnLun...6....1H.
External links
edit
Media related to NGC 2805 at Wikimedia Commons- NGC 2805 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
