NGC 809
| NGC 809 | |
|---|---|
 NGC 809 by Sloan Digital Sky Survey | |
| Observation data (J2000 epoch) | |
| Constellation | Cetus |
| Right ascension | 02h 04m 18.97s[1] |
| Declination | −08° 44′ 07.06″[1] |
| Redshift | 0.01781±0.00001[2] |
| Heliocentric radial velocity | 5,292 km/s[2] |
| Distance | 245.14 ± 0.29 Mly (75.16 ± 0.09 Mpc)[3] |
| Apparent magnitude (B) | 14.66[4] |
| Characteristics | |
| Type | (R)S0^+?[5] |
| Size | ~108,500 ly (33.27 kpc) (estimated)[5] |
| Apparent size (V) | 1.23′ × 0.92′[6] |
| Other designations | |
| 6dF J0204190-084407, NGC 809, MCG -02-06-023, PGC 7889[7] | |
NGC 809 is a lenticular galaxy located in the constellation Cetus about 245 million light-years (75 Mpc) away from the Milky Way.[3] It was discovered by the American astronomer Lewis Swift in November 1886.[8] The galaxy is receding from the Milky Way with a line of sight velocity component of 5,292 km/s.[2]
The morphological classification of NGC 809 is (R)S0+:, indicating an outer ring structure (R) around a lenticular galaxy (S0). The galaxy has a miniature central bar structure with weakly-developed spiral arms. There is a very red ring structure that is likely dust rich. This symmetrical ring was probably formed by the impact of a satellite on the central part of the galaxy.[4]
Supernovae
[edit]Two supernovae have been observed in NGC 809:
- SN 2006ef (Type Ia, mag. 15.6) was discovered by the Lick Observatory Supernova Search (LOSS) on 18 August 2006.[9][10]
- SN 2025yn (Type II, mag. 18.978) was discovered by ATLAS on 21 January 2025.[11]
References
[edit]- ^ a b Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b c Ahumada, Romina; et al. (July 2020). "The 16th Data Release of the Sloan Digital Sky Surveys: First Release from the APOGEE-2 Southern Survey and Full Release of eBOSS Spectra". The Astrophysical Journal Supplement Series. 249 (1). id. 3. arXiv:1912.02905. Bibcode:2020ApJS..249....3A. doi:10.3847/1538-4365/ab929e.
- ^ a b Tully, R. Brent; et al. (October 2013). "Cosmicflows-2: The Data". The Astronomical Journal. 146 (4): 25. arXiv:1307.7213. Bibcode:2013AJ....146...86T. doi:10.1088/0004-6256/146/4/86. S2CID 118494842. 86.
- ^ a b Ilyina, M. A.; Sil'Chenko, O. K. (September 2011). "Lenticular galaxies with ultraviolet rings". Astronomy Letters. 37 (9): 589–596. arXiv:1105.3147. Bibcode:2011AstL...37..589I. doi:10.1134/S0320010811090051.
- ^ a b "NED Search results for NGC 809". NASA/IPAC Extragalactic Database. Retrieved 2025-12-30.
- ^ Moustakas, John; et al. (2023). "Siena Galaxy Atlas 2020". The Astrophysical Journal Supplement Series. 269 (1): 3. arXiv:2307.04888. Bibcode:2023ApJS..269....3M. doi:10.3847/1538-4365/acfaa2.
- ^ "NGC 809". SIMBAD. Centre de données astronomiques de Strasbourg.
- ^ Seligman, Courtney. "New General Catalog Objects: NGC 800 - 849". Retrieved 29 December 2025.
- ^ Puckett, T.; et al. (2006). "Supernovae 2006ed-2006en". International Astronomical Union Circular (8741): 1. Bibcode:2006IAUC.8741....1P. Retrieved 2026-04-19.
- ^ "SN 2006ef". Transient Name Server. IAU. Retrieved 29 December 2025.
- ^ "SN 2025yn". Transient Name Server. IAU. Retrieved 29 December 2025.
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