1 Camelopardalis

1 Camelopardalis
Location of 1 Camelopardalis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Camelopardalis
1 Cam A
Right ascension 04h 32m 01.841s[1]
Declination +53° 54′ 39.02″[1]
Apparent magnitude (V) 5.77[2]
1 Cam B
Right ascension 04h 32m 00.915s[3]
Declination +53° 54′ 45.35″[3]
Apparent magnitude (V) 6.803[2]
Characteristics
1 Cam A
Spectral type O9.7IIn[4]
U−B color index −0.73[5]
B−V color index +0.18[5]
Variable type SPB?[6]
1 Cam B
Spectral type B1IV:[7]
U−B color index −0.70[5]
B−V color index +0.16[5]
Astrometry
1 Cam A
Proper motion (μ) RA: +2.775[1] mas/yr
Dec.: −3.783[1] mas/yr
Parallax (π)1.2630 ± 0.0486 mas[1]
Distance2,580 ± 100 ly
(790 ± 30 pc)
1 Cam B
Proper motion (μ) RA: +0.775[3] mas/yr
Dec.: −3.211[3] mas/yr
Parallax (π)1.1211 ± 0.0462 mas[3]
Distance2,900 ± 100 ly
(890 ± 40 pc)
Absolute magnitude (MV)−5.53[8]
Details
1 Cam A
Luminosity4,365[9] L☉
Surface gravity (log g)3.65[9] cgs
Temperature29,800[9] K
Rotational velocity (v sin i)275[10] km/s
1 Cam B
Luminosity1,995[11] L☉
Temperature29,512[11] K
Rotational velocity (v sin i)11[11] km/s
Age<20[8] Myr
Other designations
DL Camelopardalis, HR 1417, HD 28446, SAO 24672, BD+53°779, FK5 165, WDS J04320+5355, HIP 21148
Database references
SIMBADdata
1 Cam A
1 Cam B

1 Camelopardalis (1 Cam) is a double star system in the constellation Camelopardalis. Its combined apparent magnitude is 5.56 and it is approximately 800 parsecs (2,600 ly) away.

The 1 Camelopardalis system is part of the Camelopardalis OB1 stellar association, which is 820 pc away.[12] 1 Camelopardalis A is a hot massive star which has evolved away from the main sequence to become a giant. 1 Camelopardalis B is 10" away and is probably an early B class subgiant.

There is an 11th magnitude star 150" away.[13] It has been considered to be a member of a triple system,[12] but Gaia observations show it to be an unrelated background object.[14]

A light curve for DL Camelopardalis, plotted from TESS data[15]

1 Camelopardalis A is a variable star with a small amplitude. It has a likely period of 0.22132 days and is thought to be a β Cephei variable or slowly pulsating B-type star.[16] Hipparcos photometry shows an amplitude of 0.035 magnitudes.[17] It has a rotational velocity of 275 km/s, one of the highest known.[10]

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