CS Camelopardalis
Binary star in the constellation Camelopardalis
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CS Camelopardalis (CS Cam; HD 21291) is a binary star in reflection nebula VdB 14, in the constellation Camelopardalis. It is a 4th magnitude star, and is visible to the naked eye under good observing conditions.
 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Camelopardalis |
| A | |
| Right ascension | 03h 29m 04.13196s[1] |
| Declination | +59° 56′ 25.1970″[1] |
| Apparent magnitude (V) | 4.22[2] (4.19 - 4.23[3]) |
| B | |
| Right ascension | 03h 29m 04.22561s[4] |
| Declination | +59° 56′ 25.9860″[4] |
| Apparent magnitude (V) | 7.75[5] |
| Characteristics | |
| A | |
| Spectral type | B9 Ia[6] |
| U−B color index | −0.23[2] |
| B−V color index | +0.41[2] |
| Variable type | α Cyg[7] |
| B | |
| Spectral type | B2III[8] |
| Astrometry | |
| A | |
| Radial velocity (Rv) | −5.10[9] km/s |
| Proper motion (μ) | RA: −2.751[1] mas/yr Dec.: −1.066[1] mas/yr |
| Parallax (π) | 1.0527±0.1311 mas[1] |
| Distance | approx. 3,100 ly (approx. 900 pc) |
| Absolute magnitude (MV) | −7.10[10] |
| B | |
| Proper motion (μ) | RA: −1.702[4] mas/yr Dec.: −0.646[4] mas/yr |
| Parallax (π) | 0.9642±0.0601 mas[4] |
| Distance | 3,400 ± 200 ly (1,040 ± 60 pc) |
| Details | |
| Mass | 19[11] M☉ |
| Radius | 85.7[11] R☉ |
| Luminosity | 75,900[12] L☉ |
| Surface gravity (log g) | 1.65[6] cgs |
| Temperature | 10,800[6] K |
| Rotational velocity (v sin i) | 30[13] km/s |
| Age | 16.5[14] Myr |
| Other designations | |
| ADS 2544, BD+59°660, CCDM 03291+5956, GC 4113, HD 21291, HIP 16228, HR 1035, SAO 24054, WDS J03291+5956 | |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) | |
It forms a group of stars known as the Camelopardalis R1 association, part of the Cam OB1 association. The near-identical supergiant CE Camelopardalis is located half a degree to the south.
As a binary star, CS Cam is designated as Struve 385 (STF 385, Σ385).[15]
The primary component, CS Camelopardalis A, is a blue-white B-type supergiant with a mean apparent magnitude of 4.21m. The star was found to be a variable star when the Hipparcos data was analyzed. It was given its variable star designation in 1999.[17] It is classified as an Alpha Cygni type variable star and its brightness varies from magnitude 4.19m to 4.23m. Its companion, CS Camelopardalis B, is a magnitude 8.7m blue giant star located 2.4 arcseconds from the primary.[18]