NGC 87
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| NGC 87 | |
|---|---|
 NGC 87, a warped galaxy in Robert's Quartet | |
| Observation data (J2000 epoch) | |
| Constellation | Phoenix |
| Right ascension | 00h 21m 14.2133s[1] |
| Declination | −48° 37′ 42.81″[1] |
| Redshift | 0.011391[1] |
| Heliocentric radial velocity | 3415 ± 23 km/s[1] |
| Distance | 154.7 ± 11.0 Mly (47.44 ± 3.36 Mpc)[1] |
| Apparent magnitude (V) | 14.1 |
| Characteristics | |
| Type | IBm pec[1] |
| Size | ~51,500 ly (15.80 kpc) (estimated)[1] |
| Apparent size (V) | 0.9′ × 0.7′ |
| Other designations | |
| ESO 194-G008, PGC 1357 | |
NGC 87 is a diffuse, irregular galaxy located approximately 155 million light-years away in the southern constellation of Phoenix.[2] It was discovered on September 30, 1834, by the English astronomer John Herschel.[3]
Physical characteristics
[edit]NGC 87 is classified morphologically as a diffuse irregular galaxy, displaying a lack of a distinct central nucleus or organized spiral structure.[2] At its distance of 155 million light-years, its angular size corresponds to a physical diameter of roughly 42,000 light-years, making it about 40% the size of the Milky Way.[2]
Unlike its spiral and lenticular companions, NGC 87 contains significant reservoirs of cold neutral hydrogen gas and active H II regions.[4] Its asymmetric appearance and chaotic star-forming areas are driven by tidal interactions with nearby galactic companions.[4]
Group membership
[edit]The galaxy is a member of Robert's Quartet, a compact galaxy group located in Phoenix that also includes NGC 88, NGC 89, and NGC 90.[5] The four member galaxies reside within a region spanning roughly 150,000 light-years across and exhibit active gravitational interactions.[5]
See also
[edit]References
[edit]- 1 2 3 4 5 6 7 "NED results for object NGC 0087". National Aeronautics and Space Administration / Infrared Processing and Analysis Center. Retrieved 19 February 2017.
- 1 2 3 "NASA/IPAC Extragalactic Database Results for NGC 0087". NASA/IPAC. Retrieved 19 February 2017.
- ↑ Sinnott, Roger W. (1988). NGC 2000.0: The Complete New General Catalogue and Index Catalogues of Nebulae and Star Clusters by J. L. E. Dreyer. Sky Publishing Corporation. ISBN 978-0-933346-51-2.
- 1 2 Madore, Barry F.; Nelson, Eric; Petrillo, Kristen (May 2009). "Atlas and Catalog of Collisional Ring Galaxies". The Astrophysical Journal Supplement Series. 181 (2): 572–604. Bibcode:2009ApJS..181..572M. doi:10.1088/0067-0049/181/2/572.
- 1 2 "Cosmic Portrait of a Perturbed Family". ESO News. European Southern Observatory. November 4, 2005. Retrieved August 16, 2026.
External links
[edit]- NGC 87[link removed]
- http://www.astro.pef.zcu.cz/[link removed]
- NGC 87 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
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