BD Camelopardalis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Camelopardalis |
| Right ascension | 03h 42m 09.32551s |
| Declination | +63° 13′ 00.4686″ |
| Apparent magnitude (V) | 5.11 |
| Characteristics | |
| Evolutionary stage | AGB |
| Spectral type | S3.5/2 (M4III) |
| U−B color index | 1.82 |
| B−V color index | 1.63 |
| R−I color index | 1.39 |
| Variable type | Lb |
| Astrometry | |
| Radial velocity (Rv) | −22.28 km/s |
| Proper motion (μ) | RA: −17.877 mas/yr Dec.: +20.052 mas/yr |
| Parallax (π) | 4.2671±0.2581 mas |
| Distance | 750+36 −49 ly (231+11 −15 pc) |
| Absolute magnitude (MV) | −0.90 |
| Orbit | |
| 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 | |
| Mass | 2.68 M☉ |
| Radius | 148+8 −10 R☉ |
| Luminosity | 2,000 L☉ |
| Surface gravity (log g) | 1.5 cgs |
| Temperature | 3,600±150 K |
| Metallicity | −0.25 |
| Other designations | |
| BD Cam, SAO 12874, BD+62°597, HD 22649, HIP 17296, FK5 129, HR 1105 | |
| Database references | |
| SIMBAD | data |
BD Camelopardalis is an S star and symbiotic star in the constellation Camelopardalis. It is a 5th magnitude star, and is visible to the naked eye under good observing conditions. It was recognized as a spectroscopic binary star in 1922, and its orbital solution published in 1984; it has a 596-day orbital period. A spectroscopic composition analysis was done of the red giant primary star in 1986.