Astronomy:NGC 998
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Short description: Galaxy in the constellation Cetus
| NGC 998 | |
|---|---|
 SDSS image of NGC 998 | |
| Observation data (J2000 epoch) | |
| Constellation | Cetus |
| Right ascension | 02h 37m 16.50891s[1] |
| Declination | +07° 20′ 08.7169″[1] |
| Redshift | 0.02184[2] |
| Helio radial velocity | 6476 km/s[2] |
| Distance | 303.7 ± 21.4 Mly (93.11 ± 6.56 Mpc)[3] |
| Apparent magnitude (B) | 14.6[2] |
| Absolute magnitude (V) | -23.46 +/- 0.51[2] |
| Characteristics | |
| Type | S?[2] |
| Other designations | |
| MCG+01-07-015, PGC 9934[2] | |
NGC 998 is a spiral galaxy in the constellation Cetus. It is estimated to be 294 million light years from the Milky Way and has a diameter of approximately 90,000 ly. Together with NGC 997, it forms a gravitationally bound pair of galaxies. NGC 998 was discovered by astronomer Albert Marth on 10 November 1863 using a 48-inch telescope.[4][5][6]
See also
References
- ↑ 1.0 1.1 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 "NGC 998". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+998.
- ↑ "Results for object NGC 0998 (NGC 998)". NASA/IPAC Extragalactic Database. California Institute of Technology. https://ned.ipac.caltech.edu/byname?objname=NGC%20998&hconst=67.8&omegam=0.308&omegav=0.692&wmap=4&corr_z=1.
- ↑ "Revised NGC Data for NGC 998". http://spider.seds.org/ngc/revngcic.cgi?NGC%20998.
- ↑ "Your NED Search Results". http://ned.ipac.caltech.edu/cgi-bin/objsearch?objname=NGC+998&extend=no&hconst=73&omegam=0.27&omegav=0.73&corr_z=1&out_csys=Equatorial&out_equinox=J2000.0&obj_sort=RA+or+Longitude&of=pre_text&zv_breaker=30000.0&list_limit=5&img_stamp=YES.
- ↑ Ford, Dominic. "The galaxy NGC 998 - In-The-Sky.org" (in en). https://in-the-sky.org/data/object.php?id=1021.
External links
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