31 Camelopardalis

31 Camelopardalis is a binary star system in the northern circumpolar constellation of Camelopardalis. It is visible to the naked eye as a dim point of light with a peak apparent visual magnitude of +5.12.[9] Parallax measurements provide a distance estimate of approximately 460 light years away from the Sun,[1] and the system is drifting closer to the Earth with a radial velocity of −3 km/s.[6]

31 Camelopardalis
Observation data
Epoch J2000      Equinox J2000
Constellation Camelopardalis
Right ascension  05h 54m 57.82481s[1]
Declination +59° 53′ 18.1314″[1]
Apparent magnitude (V) 5.20[2]
Characteristics
Spectral type A2V[3] (A0IV + F0)[4]
U−B color index +0.03[5]
B−V color index +0.010[2]
Variable type β Lyr
Astrometry
Radial velocity (Rv)−2.9±0.9[6] km/s
Proper motion (μ) RA: +1.488[1] mas/yr
Dec.: −17.928[1] mas/yr
Parallax (π)7.1562 ± 0.2336[1] mas
Distance460 ± 10 ly
(140 ± 5 pc)
Orbit[7]
Period (P)2.9333 d
Eccentricity (e)0.00
Longitude of the node (Ω)0.00°
Periastron epoch (T)2,423,443.05±10.00 JD
Semi-amplitude (K1)
(primary)		78.0 km/s
Details
31 Cam A
Mass3.03±0.08[8] M☉
Luminosity179.8+31.7
−26.9 L☉
Temperature9,183+149
−147 K
Rotational velocity (v sin i)75[8] km/s
Other designations
31 Cam, TU Cam, BD+59°920, FK5 2446, GC 7402, HD 214993, HIP 27971, HR 2027, SAO 25447[3]
Database references
SIMBADdata

This is a single-lined spectroscopic binary in a circular orbit with an orbital period of 2.93 days.[7] It is a detached binary with two main sequence components that do not fill their Roche lobes. The orbital plane is oriented near the line of sight from the Earth, making this a Beta Lyrae–type eclipsing binary variable star. It has the variable star designation TU Cameleopardis, while 31 Camelopardalis is the Flamsteed designation.[3] The primary eclipse lowers the visual magnitude to 5.29, while the secondary eclipse lowers it to 5.22.[9]

References
  1. 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.
  2. 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.
  3. "31 Cam". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 29 April 2017.
  4. Mezzetti, M.; et al. (1980). "Revised photometric elements of eight eclipsing binaries". Astronomy and Astrophysics Supplement Series. 42: 15–22. Bibcode:1980A&AS...42...15M.
  5. Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
  6. Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Carnegie Institute Washington D.C. Publication. Bibcode:1953GCRV..C......0W.
  7. Lucy, L. B.; Sweeney, M. A. (August 1971). "Spectroscopic binaries with circular orbits". Astronomical Journal. 76: 544–556. Bibcode:1971AJ.....76..544L. doi:10.1086/111159.
  8. Zorec, J.; Royer, F. (January 2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy & Astrophysics. 537: A120. arXiv:1201.2052. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691.
  9. Avvakumova, E. A.; et al. (October 2013). "Eclipsing variables: Catalogue and classification". Astronomische Nachrichten. 334 (8): 860. Bibcode:2013AN....334..860A. doi:10.1002/asna.201311942. hdl:10995/27061.
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