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NGC 2804
The lenticular galaxy NGC 2804
Observation data (J2000 epoch)
Constellation	Cancer
Right ascension	09 16 50.0173
Declination	+20° 11′ 54.631″
Redshift	0.027662
Heliocentric radial velocity	8293 ± 3 km/s
Distance	412.8 ± 28.9 Mly (126.55 ± 8.86 Mpc)
Apparent magnitude (V)	12.8
Characteristics
Type	S0
Size	~226,100 ly (69.31 kpc) (estimated)
Apparent size (V)	1.4′ × 1.2′
Other designations
2MASX J09165000+2011548, IC 2455, UGC 4901, MCG +03-24-028, PGC 26196, CGCG 091-047

NGC 2804 is a lenticular galaxy in the constellation of Cancer. Its velocity with respect to the cosmic microwave background is 8580 ± 20 km/s, which corresponds to a Hubble distance of 126.55 ± 8.86 Mpc (∼413 million light-years). It was discovered by British astronomer John Herschel on 24 February 1827. This galaxy was also observed by the French astronomer Stéphane Javelle on 9 April 1896, and was later added to the Index Catalogue as IC 2455.

According to the SIMBAD database, NGC 2804 is a LINER galaxy, i.e. a galaxy whose nucleus has an emission spectrum characterized by broad lines of weakly ionized atoms.

One supernova has been observed in NGC 2804: SN 2023ftr (type Ia, mag. 18.51) was discovered by the Zwicky Transient Facility on 16 April 2023.

See also

• List of NGC objects (2001–3000)

References

1. ^ "Results for object NGC 2804". NASA/IPAC Extragalactic Database. NASA and Caltech. Retrieved 10 August 2024.
2. ^ Seligman, Courtney. "NGC 2804". Celestial Atlas. Retrieved 10 August 2024.
3. "NGC 2804". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 16 December 2024.
4. "SN 2023ftr". Transient Name Server. IAU. Retrieved 16 December 2024.

External links

• Media related to NGC 2804 at Wikimedia Commons
• NGC 2804 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images

v t e Constellation of Cancer
Cancer in Chinese astronomy List of stars in Cancer
Stars	Bayer α (Acubens) β (Tarf) γ (Asellus Borealis) δ (Asellus Australis) ε (Meleph) ζ (Tegmine) ζ η θ ι κ λ (Piautos) μ μ ν ξ (Nahn) ο ο π π ρ (Copernicus) ρ σ σ σ τ υ υ φ φ χ ψ ψ ω ω Flamsteed 1 3 5 7 8 11 12 15 20 (d) 21 24 25 (d) 27 28 (CX) 29 34 35 36 (c) 37 38 39 40 42 44 45 (A) 46 49 (b) 50 (A) 53 54 57 60 61 66 67 68 70 71 75 78 79 80 83 Variable R X RS VZ AZ DX EI HL HM HD 72945 72946 73534 (Gakyid) 79498 Other GJ 3470 (Kaewkosin) HIP 41378 K2-187 LHS 2090 Pr0211 WD J0914+1914 YBP 1194
Exoplanets 55 Cancri b c d e f β Cancri b GJ 3470 b HD 73534 b HIP 41378 b c d e f Pr0201 b
Star clusters Beehive Cluster Messier 67
Nebulae Abell 30 Abell 31
Galaxies	NGC 2503 2535 2536 2608 2623 2648 2775 2801 2803 2804 2812 Other 3C 191 3C 212 3C 215 DLA0817g IC 2431 OJ 287 QSO B0839+187 UGC 4457 4C +29.30 SDSS J0849+1114
Galaxy clusters Abell 671 Musket Ball Cluster
Category

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• IC objects
• NGC objects
• Principal Galaxies Catalogue objects
• MCG objects
• UGC objects
• Cancer (constellation)
• Astronomical objects discovered in 1827
• Discoveries by John Herschel
• Lenticular galaxies
• LINER galaxies
• Lenticular galaxy stubs