astro.wikisort.org - StarOmega2 Cygni, Latinized from ω2 Cygni, is the Bayer designation for a solitary[7] star in the northern constellation of Cygnus. It has an apparent visual magnitude of 5.5,[2] which is faintly visible to the naked eye on a dark night. Based upon an annual parallax shift of 8.17 mas,[1] it is located roughly 399 light years from the Sun. At that distance, the visual magnitude is diminished by an extinction factor of 0.08 due to interstellar dust.[2]
Star in the constellation Cygnus
Omega2 Cygni
Observation data
Epoch J2000.0 Equinox J2000.0 (ICRS) |
| Constellation |
Cygnus |
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| Right ascension |
20h 31m 18.81663s[1] |
| Declination |
+49° 13′ 13.0656″[1] |
| Apparent magnitude (V) |
5.5292±0.0013[2] |
| Characteristics |
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| Spectral type |
M2 III[3] |
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| Astrometry |
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| Radial velocity (Rv) | −64.15±0.20[2] km/s |
| Proper motion (μ) | RA: +9.21[1] mas/yr
Dec.: −31.88[1] mas/yr |
| Parallax (π) | 8.17 ± 0.19 mas[1] |
| Distance | 399 ± 9 ly
(122 ± 3 pc) |
| Absolute magnitude (MV) | +0.00[4] |
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| Details |
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| Luminosity | 301[5] L☉ |
| Temperature | 3,847[5] K |
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| SIMBAD | data |
This is a red giant star on the asymptotic giant branch, with a stellar classification of M2 III.[3] It is a suspected variable star, although the evidence is considered "doubtful or erroneous". If it does exist, the variability is small with an amplitude of 0.05 magnitude and a timescale of around 30 days.[8] There is a 58.3% chance that this star is a member of the Hercules stream.[2]
See also
References
- van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
- Famaey, B.; et al. (January 2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", Astronomy and Astrophysics, 430 (1): 165–186, arXiv:astro-ph/0409579, Bibcode:2005A&A...430..165F, doi:10.1051/0004-6361:20041272, S2CID 17804304.
- Eggen, Olin J. (July 1992), "Asymptotic giant branch stars near the sun", Astronomical Journal, 104 (1): 275–313, Bibcode:1992AJ....104..275E, doi:10.1086/116239.
- 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.
- McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
- "ome02 Cyg". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-02-22.
{{cite web}}: CS1 maint: postscript (link) - Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
- Percy, John R.; Fleming, David E. B. (February 1992), "A photometric survey of suspected small-amplitude red variables", Publications of the Astronomical Society of the Pacific, 104: 96–100, Bibcode:1992PASP..104...96P, doi:10.1086/132963.
На других языках
[de] Omega2 Cygni
ω2 Cygni (Omega2 Cygni) ist ein 500 Lichtjahre von der Sonne entfernter Doppelstern im Sternbild Schwan, bestehend aus einem +5,44m hellen Hauptstern der Spektralklasse M2 und einem +6,6m hellem Begleitstern der Spektralklasse A0. Der Begleitstern befindet sich bei einem Positionswinkel von 265 Grad 256" vom Hauptstern entfernt. Er kann schon im kleinen Prismenfernglas oder Opernglas gesehen werden. Wegen des Farbkontrastes (roter Hauptstern und blauer Begleiter) ist ω2 Cygni ein schönes Objekt für Amateurastronomen. Der Stern wird auch als Rukbat / Ruchbah / Ruchba (arabisch ركبة, DMG Rukbah ‚Knie‘) bezeichnet.
- [en] Omega2 Cygni
[es] Ruchba
Ruchba o Rucba (ω2 Cyg / 46 Cygni / HD 195774 / BD+48 3154)[1] es una estrella en la constelación del Cisne de magnitud aparente +5,47.
No debe ser confundida con Ruchbah, nombre utilizado en ocasiones para designar a la estrella δ Cassiopeiae, ni con Rukbat (α Sagittarii).
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