12 Camelopardalis

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12 Camelopardalis
12 Camelopardalis.jpg
12 Camelopardalis in optical light
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Camelopardalis
Right ascension 05h 06m 12.2s
Declination +59° 01′ 16″
Apparent magnitude (V) +6.08
Absolute magnitude (V)−0.332[1]
Distance625 ± 110 ly
(192 ± 34 pc)
Spectral typeK0III
Other designations
BM Camelopardalis, HR 1623, HD 32357, BD+58°805, HIP 23743, SAO 25003, GC 6197, BDS 2480, CCDM 05062+5900

12 Camelopardalis is a spectroscopic binary[2] in the constellation Camelopardalis. It also forms a double star with 11 Camelopardalis, which is only 3 arcminutes away.

12 Camelopardalis is classified as an orange K-type giant with a mean apparent magnitude of +6.08. The binary is an RS Canum Venaticorum type variable star and its brightness varies by 0.14 magnitudes with a period of 82.8 days. The orbital period of the binary is 80.174 days. 12 Camelopardalis is approximately 625 light years from Earth.

X-ray source[edit]

BM Cam also emits X-rays and is the designated X-ray source 1H 0501+592.[3] It has been detected by HEAO 1, the Einstein Observatory, and ROSAT.


  1. ^ Böhm-Vitense, Erika; et al. (December 2000), "Ultraviolet Emission Lines in BA and Non-BA Giants", The Astrophysical Journal, 545 (2): 992–999, Bibcode:2000ApJ...545..992B, doi:10.1086/317850. 
  2. ^ Pourbaix D; Tokovinin AA; Batten AH; Fekel FC; Hartkopf WI; Levato H; et al. (Sep 2004). "SB9: The ninth cataloque of spectroscopic binary orbits". Astron Astrophys. 424 (2): 727–732. arXiv:astro-ph/0406573Freely accessible. Bibcode:2004A&A...424..727P. doi:10.1051/0004-6361:20041213. 
  3. ^ Wood KS; Meekins JF; Yentis DJ; Smathers HW; McNutt DP; Bleach RD (Dec 1984). "The HEAO A-1 X-ray source catalog". Astrophys. J. Suppl. Ser. 56 (12): 507–649. Bibcode:1984ApJS...56..507W. doi:10.1086/190992.