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Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Camelopardalis |
Right ascension | 03h 42m 09.32470s[2] |
Declination | +63° 13′ 00.4977″[2] |
Apparent magnitude (V) | 5.11[3] |
Characteristics | |
Spectral type | S3.5/2 (M4III)[3] |
U−B color index | 1.82[4] |
B−V color index | 1.63[4] |
R−I color index | 1.39 |
Variable type | Lb[5] |
Astrometry | |
Radial velocity (Rv) | -22.28[3] km/s |
Proper motion (μ) | RA: -17.27[2] mas/yr Dec.: 18.94[2] mas/yr |
Parallax (π) | 6.28 ± 0.34 mas[2] |
Distance | 520 ± 30 ly (159 ± 9 pc) |
Absolute magnitude (MV) | -0.90 |
Orbit[6] | |
Primary | BD Cam A |
Companion | BD Cam B |
Period (P) | 596.2 days |
Eccentricity (e) | 0.088 |
Inclination (i) | 105.6° |
Longitude of the node (Ω) | 162.1° |
Periastron epoch (T) | 2442794.5 |
Argument of periastron (ω) (secondary) | 334.3° |
Details | |
Red giant primary | |
Radius | 135 R☉ |
Luminosity | 185(v)/1600(bol) L☉ |
Surface gravity (log g) | 0.9 cgs |
Temperature | 3250 K |
Metallicity | 0.0 |
Other designations | |
Database references | |
SIMBAD | data |
BD Camelopardalis is an S star and symbiotic star in the constellation Camelopardalis. It was recognized as a spectroscopic binary star in 1922, and its orbital solution published in 1984;[7] it has a 596-day orbital period. A spectroscopic composition analysis was done of the red giant primary star in 1986.[8]