31 Camelopardalis

31 Camelopardalis

A visual band light curve for TU Camelopardalis, adapted from West (1968)[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Camelopardalis
Right ascension 05h 54m 57.82481s[2]
Declination +59° 53′ 18.1314″[2]
Apparent magnitude (V) 5.20[3]
Characteristics
Spectral type A2V[4] (A0IV + F0)[5]
U−B color index +0.03[6]
B−V color index +0.010[3]
Variable type β Lyr[7]
Astrometry
Radial velocity (Rv)−2.9±0.9[8] km/s
Proper motion (μ) RA: +1.488[2] mas/yr
Dec.: −17.928[2] mas/yr
Parallax (π)7.1562 ± 0.2336 mas[2]
Distance460 ± 10 ly
(140 ± 5 pc)
Orbit[9]
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[10] M☉
Luminosity179.8+31.7
−26.9 L☉
Temperature9,183+149
−147 K
Rotational velocity (v sin i)75[10] km/s
Other designations
31 Cam, TU Cam, BD+59°920, FK5 2446, GC 7402, HD 214993, HIP 27971, HR 2027, SAO 25447[4]
Database references
SIMBADdata

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.[7] Parallax measurements provide a distance estimate of approximately 460 light years away from the Sun,[2] and the system is drifting closer to the Earth with a radial velocity of −3 km/s.[8]

This is a single-lined spectroscopic binary in a circular orbit with an orbital period of 2.93 days.[9] 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.[4] The primary eclipse lowers the visual magnitude to 5.29, while the secondary eclipse lowers it to 5.22.[7]

  1. ^ Cite error: The named reference West was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference Simbad was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Mezzetti1980 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference EgUBV was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference Avvakumova2013 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference GCRV was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Lucy1971 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Zorec2012 was invoked but never defined (see the help page).