31 Camelopardalis

31 Camelopardalis

Observation data Epoch J2000      Equinox J2000
Constellation	Camelopardalis
Right ascension	05^h 54^m 57.828^s[1]
Declination	+59° 53′ 18.12″[1]
Apparent magnitude (V)	5.197
Characteristics
Spectral type	A2V
U−B color index	0.03
B−V color index	0.02
Variable type	Beta Lyrae variable
Astrometry
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
Details
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
SIMBAD	data
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.

References

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

• HR 2027
• Image 31 Camelopardalis