HD 99922

Double star in the constellation Crater From Wikipedia, the free encyclopedia

HD 99922 is a double star system in the constellation of Crater. It shines with an apparent visual magnitude of 5.77 from a distance of about 377 light years (116 parsecs) away from the Earth. The primary star is an A-type main sequence star; the secondary star is located about 8 arcseconds away.[16]

Apparentmagnitude(V)5.813[3]
Apparentmagnitude(V)8.543[3]
Evolutionarystagemain sequence[2][5]
SpectraltypeA0V[6]
Quick facts Apparent magnitude (V), Characteristics ...
HD 99922
Observation data
Epoch J2000      Equinox J2000
Constellation Crater[1]
HD 99922 A
Right ascension 11h 29m 38.619s[2]
Declination −24° 27′ 50.48″[2]
Apparent magnitude (V) 5.813[3]
HD 99922 B
Right ascension 11h 29m 39.219s[4]
Declination −24° 27′ 49.40″[4]
Apparent magnitude (V) 8.543[3]
Characteristics
HD 99922 A
Evolutionary stage main sequence[2][5]
Spectral type A0V[6]
B−V color index +0.07[7]
HD 99922 B
Evolutionary stage main sequence[4]
Spectral type F1V[8]
Astrometry
HD 99922 A
Radial velocity (Rv)−2.50[9] km/s
Proper motion (μ) RA: −44.450[2] mas/yr
Dec.: +15.779[2] mas/yr
Parallax (π)8.6451±0.0395 mas[2]
Distance377 ± 2 ly
(115.7 ± 0.5 pc)
HD 99922 B
Proper motion (μ) RA: −50.386[4] mas/yr
Dec.: +19.267[4] mas/yr
Parallax (π)9.2333±0.0678 mas[4]
Distance353 ± 3 ly
(108.3 ± 0.8 pc)
Details
HD 99922 A
Mass2.2[10] M☉
Radius3.2[10] R☉
Luminosity55[10] L☉
Surface gravity (log g)4.05[11] cgs
Temperature10,186[11] K
Metallicity [Fe/H]+0.25[11] dex
Rotation1.39 days[12]
Rotational velocity (v sin i)65[5] km/s
Age510[2] Myr
HD 99922 B
Mass1.3[10] M☉
Radius1.4[10] R☉
Surface gravity (log g)4.23[10] cgs
Temperature6,449[10] K
Age4.7[13] Gyr
Other designations
CD−23°10009, HD 99922, HR 4428, ADS 8183 AB[14]
HD 99922 A: HIP 56078, SAO 179935[15]
HD 99922 B: SAO 179936[16]
Database references
SIMBADAB
A
B
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Other designations include HR 4428 and HIP 56078.[14]

References

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