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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]
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