| Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 20h 31m 18.81663s [1] |
| Declination | +49° 13′ 13.0656″ [1] |
| Apparent magnitude (V) | 5.5292±0.0013 [2] |
| Characteristics | |
| Spectral type | M2 III [3] |
| Astrometry | |
| 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] |
| Details | |
| Luminosity | 301 [5] L☉ |
| Temperature | 3,847 [5] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
Omega2 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]
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
- ^ a b c d e f 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.
- ^ a b c d e 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.
- ^ a b 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.
- ^ a b 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.
| Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 20h 31m 18.81663s [1] |
| Declination | +49° 13′ 13.0656″ [1] |
| Apparent magnitude (V) | 5.5292±0.0013 [2] |
| Characteristics | |
| Spectral type | M2 III [3] |
| Astrometry | |
| 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] |
| Details | |
| Luminosity | 301 [5] L☉ |
| Temperature | 3,847 [5] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
Omega2 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]
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
- ^ a b c d e f 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.
- ^ a b c d e 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.
- ^ a b 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.
- ^ a b 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.