Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Camelopardalis |
A | |
Right ascension | 03h 17m 31.527s[1] |
Declination | +65° 39′ 30.11″[1] |
Apparent magnitude (V) | 7.05±0.01[1] |
B | |
Right ascension | 03h 17m 31.593s[1] |
Declination | +65° 39′ 30.26″[1] |
Apparent magnitude (V) | 7.39±0.01[1] |
Characteristics | |
A | |
Spectral type | A2 V[2] |
U−B color index | +0.06[3] |
B−V color index | +0.08[3] |
B | |
Spectral type | A4V[2] |
Astrometry | |
Radial velocity (Rv) | −6±2[4] km/s |
Proper motion (μ) | RA: −10.54 mas/yr[5] Dec.: +5.84 mas/yr[5] |
Parallax (π) | 5.92 ± 0.65 mas[5] |
Distance | approx. 550 ly (approx. 170 pc) |
Absolute magnitude (MV) | +0.3[6] |
Orbit[7] | |
Primary | HD 20104 A |
Companion | HD 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 | |
Mass | 2.46[8] M☉ |
B | |
Mass | 2.27[8] M☉ |
Other designations | |
Database references | |
SIMBAD | The 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,[5] the system is approaching the Sun with a heliocentric radial velocity of −6 km/s.[4]
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]
Fabricius2002
was invoked but never defined (see the help page).Edwards1976
was invoked but never defined (see the help page).Haupt1974
was invoked but never defined (see the help page).Wilson1953
was invoked but never defined (see the help page).vL2007
was invoked but never defined (see the help page).Anderson2012
was invoked but never defined (see the help page).Heintz1998
was invoked but never defined (see the help page).Cvetkovic2010
was invoked but never defined (see the help page).Anders2019
was invoked but never defined (see the help page).Mason2001
was invoked but never defined (see the help page).Zorec2012
was invoked but never defined (see the help page).Royer2007
was invoked but never defined (see the help page).