22 Camelopardalis is a binary star system in the northern circumpolar constellation of Camelopardalis,[7] located 212 light years away from the Sun.[1] It has an apparent visual magnitude of 7.03,[2] which is below the normal limit for visibility with the naked eye. This object is moving further from the Earth with a mean heliocentric radial velocity of +10 km/s.[4] Eggen (1991) listed it as a member of the IC 2391 supercluster.[8] It has also been catalogued as a member of the Hyades group. However, Griffin (2005) suggests it belongs to neither.[5]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Camelopardalis |
| Right ascension | 05h 39m 05.40416s[1] |
| Declination | +56° 21′ 36.1540″[1] |
| Apparent magnitude (V) | 7.03[2] |
| Characteristics | |
| Spectral type | F5 V[3] |
| B−V color index | 0.411±0.004[2] |
| Astrometry | |
| Radial velocity (Rv) | +10.3±1.8[4] km/s |
| Proper motion (μ) | RA: +10.514[1] mas/yr Dec.: −131.789[1] mas/yr |
| Parallax (π) | 15.4048 ± 0.1014 mas[1] |
| Distance | 212 ± 1 ly (64.9 ± 0.4 pc) |
| Absolute magnitude (MV) | 3.14[3] |
| Orbit[5] | |
| Period (P) | 81.463±0.005 d |
| Eccentricity (e) | 0.136±0.024 |
| Periastron epoch (T) | 51969.9±2.2 MJD |
| Argument of periastron (ω) (secondary) | 0±10° |
| Semi-amplitude (K1) (primary) | 9.52±0.24 km/s |
| Details | |
| Mass | 1.34[6] M☉ |
| Radius | 1.68[1] R☉ |
| Luminosity | 5.215[1] L☉ |
| Surface gravity (log g) | 4.26[6] cgs |
| Temperature | 6,732±229[6] K |
| Metallicity [Fe/H] | 0.01[4] dex |
| Age | 1.515[6] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is a single-lined spectroscopic binary system with an orbital period of 81.5 days and a significant eccentricity of 0.14. It has an 'a sin i' value of 10.57 ± 0.27 Gm (0.0707 ± 0.0018 AU),[5] where a is the semimajor axis and i is the orbital inclination to the line of sight from the Earth. This value provides a lower bound on the true semimajor axis of their orbit.
The visible component is an F-type main-sequence star with a stellar classification of F5 V.[3] It is an estimated 1.5[6] billion years old with 1.3[6] times the mass of the Sun and 1.7[1] times the Sun's radius. It is radiating 5.2[1] times the Sun's luminosity from its photosphere at an effective temperature of 6,732 K.[6]
References
edit- ^ a b c d e f g h i j Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ 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 Abt, Helmut A. (2004), "Spectral Classification of Stars in A Supplement to the Bright Star Catalogue", The Astrophysical Journal Supplement Series, 155 (1): 175–177, Bibcode:2004ApJS..155..175A, doi:10.1086/423803
- ^ a b c Casagrande, L.; et al. (June 2011), "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey", Astronomy and Astrophysics, 530: A138, arXiv:1103.4651, Bibcode:2011A&A...530A.138C, doi:10.1051/0004-6361/201016276, S2CID 56118016.
- ^ a b c Griffin, R. F. (June 2005), "Spectroscopic binary orbits from photoelectric radial velocities. Paper 182: 22 Camelopardalis, HD 156051, HR 6890, & HD 221757", The Observatory, 125: 134–152, Bibcode:2005Obs...125..134G.
- ^ a b c d e f g David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID 33401607.
- ^ a b "22 Cam". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-04-17.
- ^ Eggen, O. J. (December 1991), "The IC 2391 Supercluster", Astronomical Journal, 102: 2028, Bibcode:1991AJ....102.2028E, doi:10.1086/116025.