31 Camelopardalis

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31 Camelopardalis
Observation data
Epoch J2000      Equinox J2000
Constellation Camelopardalis
Right ascension 05h 54m 57.828s[1]
Declination +59° 53′ 18.12″[1]
Apparent magnitude (V) 5.197
Spectral type A2V
U−B color index 0.03
B−V color index 0.02
Variable type Beta Lyrae variable
Radial velocity (Rv) -2.9 km/s
Proper motion (μ) RA: 2.30 ± 0.54[1] mas/yr
Dec.: -18.43 ± 0.38[1] mas/yr
Parallax (π) 6.96 ± 0.51[1] mas
Distance 470 ± 30 ly
(140 ± 10 pc)
Absolute magnitude (MV) 5.214
Mass 3,1 M
Radius 2,1 R
Luminosity 40 L
Temperature 7,500–10,000 K
Rotation 76 Km/s
0,0080219 Year
Other designations
TU Camelopardalis, HR 2027, HD 39220, BD+59°920, FK5 2446, HIP 27971, SAO 25447, GC 7402.
Database references
Data sources:
Hipparcos Catalogue,
CCDM (2002),
Bright Star Catalogue (5th rev. ed.)

31 Camelopardalis is an eclipsing spectroscopic binary in the constellation Camelopardalis. It is approximately 470 light years from Earth.[1]

The binary system is classified as a white A-type main sequence dwarf with a mean apparent magnitude of +5.20. Both component stars are detached main sequence stars which do not fill their Roche lobes. Because the components regularly eclipse each other, 31 Camelopardalis is classified as a variable star and its brightness varies from magnitude +5.12 to +5.29 with a period of 2.93 days, which is the orbital period of the binary.


  1. ^ a b c d e f van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.  Vizier catalog entry