NGC 2805

NGC 2805
NGC 2805 imaged by the Hubble Space Telescope
Observation data (J2000 epoch)
ConstellationUrsa Major
Right ascension09h 20m 20.3551s[1]
Declination+64° 06′ 10.771″[1]
Redshift0.005779 [1]
Heliocentric radial velocity1733 ± 1 km/s[1]
Distance88.2 ± 6.2 Mly (27.05 ± 1.90 Mpc)[1]
Apparent magnitude (V)11.0[1]
Characteristics
TypeSAB(rs)d[1]
Size~90,800 ly (27.84 kpc) (estimated)[1]
Apparent size (V)6.3′ × 4.8′[1]
Other designations
IRAS 09162+6418, 2MASX J09202040+6406099, UGC 4936, MCG +11-12-003, PGC 26410, CGCG 312-002[1]

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]

One supernova has been observed in NGC 2805: SN 2019hsw (type II, mag. 15.4) was discovered by ASAS-SN on 18 June 2019.[4]

NGC 2805 Group

NGC 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

References

  1. ^ a b c d e f g h i j k "Results for object NGC 2805". NASA/IPAC Extragalactic Database. NASA and Caltech. Retrieved 15 August 2024.
  2. ^ "Distance Results for NGC 2805". NASA/IPAC EXTRAGALACTIC DATABASE. NASA. Retrieved 15 August 2024.
  3. ^ Seligman, Courtney. "NGC 2805". Celestial Atlas. Retrieved 15 August 2024.
  4. ^ "SN 2019hsw". Transient Name Server. IAU. Retrieved 15 August 2024.
  5. ^ 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.
  6. ^ 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.