HD 12139

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HD 12139
Observation data
Epoch J2000      Equinox J2000
Constellation Aries
Right ascension 01h 59m 35.68295s[1]
Declination 21° 03′ 30.8402″[1]
Apparent magnitude (V) 5.89[2]
Spectral type K0III-IV[2]
B−V color index 1.03[2]
Radial velocity (Rv) -1.97[2] km/s
Proper motion (μ) RA: 140.10[1] mas/yr
Dec.: -15.68[1] mas/yr
Parallax (π) 8.34 ± 0.84[1] mas
Distance approx. 390 ly
(approx. 120 pc)
Absolute magnitude (MV) 0.50
Other designations
BD+20° 322, HIP 9307, HR 577, SAO 75077.
Database references
Data sources:
Hipparcos Catalogue,
CCDM (2002),
Bright Star Catalogue (5th rev. ed.)
Database references

HD 12139 is a double star in the constellation Aries. With an apparent magnitude of 5.89, the stars can be seen by the naked eye under good conditions in rural areas. The system is located approximately 120 parsecs (390 ly) distant, and the brighter star is a red giant, meaning that it has used up its core hydrogen and is expanding.[2]


  1. 1.0 1.1 1.2 1.3 1.4 Lua error in Module:Citation/CS1/Identifiers at line 47: attempt to index field 'wikibase' (a nil value).Vizier catalog entry
  2. 2.0 2.1 2.2 2.3 2.4 "HR 378". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 22 June 2014.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>