HD 20104

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Apparentmagnitude(V)7.05±0.01[2]
Apparentmagnitude(V)7.39±0.01[2]
SpectraltypeA2 V[3]
U−B color index+0.06[4]
HD 20104
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Camelopardalis[1]
A
Right ascension 03h 17m 31.527s[2]
Declination +65° 39′ 30.11″[2]
Apparent magnitude (V) 7.05±0.01[2]
B
Right ascension 03h 17m 31.593s[2]
Declination +65° 39′ 30.26″[2]
Apparent magnitude (V) 7.39±0.01[2]
Characteristics
A
Spectral type A2 V[3]
U−B color index +0.06[4]
B−V color index +0.08[4]
B
Spectral type A4V[3]
Astrometry
Radial velocity (Rv)−6±2[5] km/s
Proper motion (μ) RA: −10.54 mas/yr[6]
Dec.: +5.84 mas/yr[6]
Parallax (π)5.92±0.65 mas[6]
Distanceapprox. 550 ly
(approx. 170 pc)
Absolute magnitude (MV)+0.3[1]
Orbit[7]
PrimaryHD 20104 A
CompanionHD 20104 B
Period (P)350 yr
Semi-major axis (a)0.46″
Eccentricity (e)0.4
Inclination (i)135°
Longitude of the node (Ω)58°
Periastron epoch (T)2055.0
Argument of periastron (ω)
(secondary)		100°
Details
A
Mass2.46[8] M☉
B
Mass2.27[8] M☉
Other designations
BD+65°338, GC 3893, HD 20104, HIP 15309, HR 967, SAO 12686, ADS 2436, WDS J03175+6540
Database references
SIMBADThe system
A
B

HD 20104 (HR 967) is a visual binary in the northern circumpolar constellation Camelopardalis. The system has a combined apparent magnitude of 6.41,[9] making it near naked eye visibility. When resolved in a large telescope, HD 20104 appears to be a pair of 7th magnitude A-type main-sequence stars with a separation of about 0.5″.[10] Located approximately 550 light years away,[6] the system is approaching the Sun with a heliocentric radial velocity of −6 km/s.[5]

The system's stars have masses twice that of the Sun[8] and effective temperatures ranging from 8,100 to 8,700 K,[9][11] typical of stars their type. The primary radiates at 71.3 L☉[11] − over luminous for its class − and spins with a projected rotational velocity of 159 km/s.[12] HD 20104 has an age of 313 million years.[11]

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