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| NGC 721 | |
|---|---|
 Pan-STARRS image of NGC 721 | |
| Observation data (J2000 epoch) | |
| Constellation | Andromeda |
| Right ascension | 01h 54m 45.45687s[1] |
| Declination | +39° 23′ 00.7702″[1] |
| Redshift | 0.018566[2] |
| Heliocentric radial velocity | 5514 km/s[2] |
| Distance | 182.6 Mly (55.98 Mpc)[3] |
| Apparent magnitude (B) | 13.8[2] |
| Characteristics | |
| Type | SB(rs)bc[4] |
| Other designations | |
| UGC 1376, MCG 06-05-043, PGC 7097[2] | |
NGC 721 is a barred spiral galaxy located in the constellation Andromeda about 250 million light years from the Milky Way. It was discovered by the Prussian astronomer Heinrich d'Arrest in 1862.[5][6][7]
- ^ a b Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051.
- ^ a b c d "NGC 721". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-05-20.
- ^ Tully, R. Brent; Courtois, Hélène M.; Sorce, Jenny G. (2016). "Cosmicflows-3". The Astronomical Journal. 152 (2): 21. arXiv:1605.01765. Bibcode:2016AJ....152...50T. doi:10.3847/0004-6256/152/2/50. S2CID 250737862. 50.
- ^ "Results for object NGC 0721 (NGC 721)". NASA/IPAC Extragalactic Database. California Institute of Technology. Retrieved 2020-05-24.
- ^ Ford, Dominic. "The galaxy NGC 721 - In-The-Sky.org". in-the-sky.org. Retrieved 2020-04-09.
- ^ "Revised NGC Data for NGC 721". spider.seds.org. Retrieved 2020-04-09.
- ^ "Your NED Search Results". ned.ipac.caltech.edu. Retrieved 2020-04-09.