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Binary star system in the constellation Camelopardalis From Wikipedia, the free encyclopedia
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]
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] |
Distance | 460 ± 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 | |
Mass | 3.03±0.08[10] M☉ |
Luminosity | 179.8+31.7 −26.9 L☉ |
Temperature | 9,183+149 −147 K |
Rotational velocity (v sin i) | 75[10] km/s |
Other designations | |
Database references | |
SIMBAD | data |
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]
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