HD 224635 and HD 224636

Binary star system in the constellation Andromeda From Wikipedia, the free encyclopedia

HD 224635 and HD 224636 is a pair of stars comprising a binary star system in the constellation Andromeda. They are located approximately 94 light years away[8] and they orbit each other every 1,200 years.[9]

ConstellationAndromeda[1]
Right ascension23h 59m 29.2915s[2]
Declination+33° 43′ 25.8773″[2]
Apparentmagnitude(V)6.46[3]
Quick facts Constellation, Right ascension ...
HD 224635/HD 224636
Observation data
Epoch J2000      Equinox ICRS
Constellation Andromeda[1]
HD 224635
Right ascension 23h 59m 29.2915s[2]
Declination +33° 43′ 25.8773″[2]
Apparent magnitude (V) 6.46[3]
HD 224636
Right ascension 23h 59m 29.2054s[4]
Declination +33° 43′ 27.6539″[4]
Apparent magnitude (V) 6.72[3]
Characteristics
HD 224635
Evolutionary stage main sequence[2]
Spectral type F8[5]
B−V color index 0.51[6]
HD 224636
Evolutionary stage main sequence[4]
Spectral type G1[5]
B−V color index 0.55[6]
Astrometry
Radial velocity (Rv)−7.90±0.2[7] km/s
Proper motion (μ) RA: −59.68±0.65[8] mas/yr
Dec.: −113.19±0.35[8] mas/yr
Parallax (π)34.57±0.51 mas[8]
Distance94 ± 1 ly
(28.9 ± 0.4 pc)
Absolute magnitude (MV)+3.5[1]
Orbit[9]
Period (P)1,224±320 yr
Semi-major axis (a)5.048±0.849″
Eccentricity (e)0.449±0.066
Inclination (i)58.9±1.0°
Longitude of the node (Ω)4.8±1.4°
Periastron epoch (T)1973±12
Argument of periastron (ω)
(secondary)		282±10°
Details
HD 224635
Mass1.19[10] M☉
Radius1.20[11] R☉
Luminosity1.90[11] L☉
Surface gravity (log g)4.36[11] cgs
Temperature6,191[11] K
Metallicity−0.070[12]
Age1.42[13] Gyr
HD 224636
Mass1.13[10] M☉
Radius1.15[11] R☉
Luminosity1.58[11] L☉
Surface gravity (log g)4.36[11] cgs
Temperature6,023[11] K
Metallicity−0.070[12]
Age1.46[13] Gyr
Other designations
BD+32 4747, HIP 118281, SAO 73656, ADS 17149, WDS J23595+3343
HD 224635: HR 9074
HD 224636: HR 9075
Database references
SIMBADHD 224635
HD 224636
Close

The primary star is HD 224635, a magnitude 6.46[3] star (making it visible by the naked eye under very favourable conditions) with a spectral type F8[5] that is 1.19 times more massive than the Sun.[10]

The secondary star is the slightly fainter HD 224636, with an apparent visual magnitude of 6.72,[3] a spectral type G1,[5] and 1.13 times more massive than the Sun.[10]

References

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