Omicron Cephei, Latinized from ο Cephei, is a binary star in the constellation of Cepheus.[5] It consists of a less massive F-type main sequence star in orbit with a more massive G-type giant star.[4] The overall apparent visual magnitude of the system is 4.75.[2]
The pair was first determined to be binary by F. G. W. Struve in 1832. Since then, the secondary has been seen to revolve approximately 45 degrees around the primary. A number of orbits have been computed, the most recent giving a period of approximately 1500 years.[4]
Visual companion
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Cepheus |
| Right ascension | 23h 18m 37.5s[8] |
| Declination | +68° 07′ 26″[8] |
| Apparent magnitude (V) | 12.8[8] |
| Position (relative to A) | |
| Epoch of observation | 1912 |
| Angular distance | 45.6″ [7] |
| Position angle | 4° [7] |
| Other designations | |
| Database references | |
| SIMBAD | data |
There is a visual companion, CCDM J23186+6807C, to the binary star. It has an approximate apparent visual magnitude of 12.8 and is located approximately 45 arcseconds away from it.[7][8]
References
- ^ a b c Component 1, HIP 115088, database entry, The Hipparcos and Tycho Catalogues, 1997, CDS ID I/239.
- ^ a b c d e f g HR 8872, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line November 24, 2008.
- ^ a b c Component 2, HIP 115088, database entry, The Hipparcos and Tycho Catalogues, 1997, CDS ID I/239.
- ^ a b c d e f Docobo, Jos A. (2003). "Orbit and System Mass for the Visual Binary WDS 23186+6807AB". The Astronomical Journal. 126 (3): 1522–1525. Bibcode:2003AJ....126.1522D. doi:10.1086/377319. S2CID 54769846..
- ^ a b c "* omi Cep". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved November 24, 2008.
- ^ a b c Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
- ^ a b c d e Entry 23186+6807, The Washington Double Star Catalog, United States Naval Observatory. Accessed on line November 24, 2008.
- ^ a b c d e "UCAC3 317-95637". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved November 24, 2008.
This page was last edited on 24 February 2023, at 09:33