22 Camelopardalis is a binary star system in the northern circumpolar constellation of Camelopardalis,[1] located 212 light years away from the Sun.[2] It has an apparent visual magnitude of 7.03,[3] 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.[5] It has also been catalogued as a member of the Hyades group. However, Griffin (2005) suggests it belongs to neither.[6]

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),[6] 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.[7] It is an estimated 1.5[8] billion years old with 1.3[8] times the mass of the Sun and 1.7[2] times the Sun's radius. It is radiating 5.2[2] times the Sun's luminosity from its photosphere at an effective temperature of 6,732 K.[8]

References

  1. ^ "22 Cam". Retrieved 2019-04-17.
  2. ^
  3. ^ 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
  4. ^ 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
  5. ^ Eggen, O. J. (December 1991), "The IC 2391 Supercluster", Astronomical Journal. 102: 2028, Bibcode:1991AJ....102.2028E. doi:10.1086/116025
  6. ^ 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
  7. ^ 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
  8. ^ 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