CQ Camelopardalis
Star in the constellation Camelopardalis
From Wikipedia, the free encyclopedia
CQ Camelopardalis, abbreviated as CQ Cam, is a solitary[13] variable star in the northern circumpolar constellation Camelopardalis. It has an apparent magnitude of 5.19,[3] making it visible to the naked eye under ideal conditions. The object is relatively far at a distance of about 2,000 light years[2] but is drifting closer with a heliocentric radial velocity of −22 km/s.[7] It has a peculiar velocity of 21.8+2.1
−1.9 km/s, making it a runaway star.[8]
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Camelopardalis |
| Right ascension | 03h 24m 40.5567s[2] |
| Declination | +64° 35′ 09.580″[2] |
| Apparent magnitude (V) | 5.19[3] |
| Characteristics | |
| Evolutionary stage | AGB[4] |
| Spectral type | M0 II[5] |
| B−V color index | +2.05[3] |
| R−I color index | +1.23[3] |
| Variable type | Lc?[6] |
| Astrometry | |
| Radial velocity (Rv) | −22.2±0.5[7] km/s |
| Proper motion (μ) | RA: −3.734 mas/yr[2] Dec.: −0.171 mas/yr[2] |
| Parallax (π) | 1.6385±0.1030 mas[2] |
| Distance | 2,000 ± 100 ly (610 ± 40 pc) |
| Details | |
| Mass | 12.7±0.5[8] M☉ |
| Radius | 333[9] R☉ |
| Luminosity | 13,236[10] L☉ |
| Surface gravity (log g) | 0.48±0.08[11] cgs |
| Temperature | 3,790±122[9] K |
| Metallicity [Fe/H] | +0.17±0.04[11] dex |
| Age | 15.8±0.3[8] Myr |
| Other designations | |
| CQ Cam, NSV 1121, AG+64°221, BD+64°391, FK5 1096, GC 4034, HD 20797, HIP 15890, HR 1009, SAO 12743[12] | |
| Database references | |
| SIMBAD | data |
CQ Cam has a stellar classification of M0 II,[5] indicating that it is a red bright giant. CQ Cam is currently on the asymptotic giant branch, fusing hydrogen and helium shells around an inert carbon core. At present it has 12.7 times the mass of the Sun but, at the age of 16 million years,[8] it has expanded to 333 times the radius of the Sun.[9] The object is a luminous star, with a bolometric luminosity over 10,000 times that of the Sun.[10] Despite this brightness, CQ Cam's large diameter yields an effective temperature of 3,790 K[9] from its photosphere, giving a red hue.
CQ Cam has been classified as a low amplitude slow irregular variable based on Hipparcos photometry.[6] However, there have not been enough observations to confirm this.[14]