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HD 12139 is an orange-hued star in the northern zodiac constellation of Aries. With an apparent visual magnitude of 5.89, it is a dim star that is just visible to the naked eye under good viewing conditions. It is located approximately 351 light-years (107.5 pc) distant from the Sun, based on parallax, but is drifting closer with a radial velocity of −2 km/s. With high probability, it is considered a member of the Hercules stream.

This object is an aging red giant with a stellar classification of K0III-IV, meaning that it has used up its core hydrogen and is expanding. At present it has 11 times the girth of the Sun. The star is about two billion years old with 1.7 times the mass of the Sun. It is radiating 58 times the luminosity of the Sun from its photosphere at an effective temperature of 4,780 K.

A magnitude 9.36 companion is located at an angular separation of 199.70″ from the primary along a position angle of 9°, as of 2015. It is unclear if the two are physically associated.

References

1. ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
2. ^ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
3. ^ Yoss, Kenneth M. (November 1961). "Spectral and Luminosity Classifications and Measurements of the Strength of Cyanogen Absorption for Late-Type Stars from Objective-Prism Spectra". Astrophysical Journal. 134: 809. Bibcode:1961ApJ...134..809Y. doi:10.1086/147209.
4. ^ Feuillet, Diane K.; et al. (2016). "Determining Ages of APOGEE Giants with Known Distances". The Astrophysical Journal. 817 (1): 40. arXiv:1511.04088. Bibcode:2016ApJ...817...40F. doi:10.3847/0004-637X/817/1/40. S2CID 118675933.
5. "HD 12139". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-11-13.
6. Ramya, P.; et al. (August 2016). "Chemical compositions and kinematics of the Hercules stream". Monthly Notices of the Royal Astronomical Society. 460 (2): 1356−1370. arXiv:1604.04821. Bibcode:2016MNRAS.460.1356R. doi:10.1093/mnras/stw852.
7. Takeda, Yoichi; Tajitsu, Akito (2014). "Spectroscopic study on the beryllium abundances of red giant stars". Publications of the Astronomical Society of Japan. 66 (5): 91. arXiv:1406.7066. Bibcode:2014PASJ...66...91T. doi:10.1093/pasj/psu066.
8. Mason, B. D.; et al. (2014). "The Washington Visual Double Star Catalog". The Astronomical Journal. 122 (6): 3466. Bibcode:2001AJ....122.3466M. doi:10.1086/323920.

v t e Constellation of Aries
Aries in Chinese astronomy List of stars in Aries
Stars	Bayer α (Hamal) β (Sheratan) γ (Mesarthim) δ (Botein) ε ζ η θ ι κ λ μ ν ξ ο π ρ ρ ρ σ τ τ Flamsteed 1 4 7 10 11 14 15 16 19 20 21 23 26 27 29 30 31 33 35 36 38 39 (Lilii Borea) 40 41 (Bharani) 47 49 50 51 52 53 54 55 56 59 60 62 64 65 66 54 Cet 85 Cet Variable TZ UX VZ (16 Tri) HR 577 728 803 952 999 HD 12661 20367 Other BD+20°307 HIP 14810 HAT-P-25 Teegarden's Star WASP-11/HAT-P-10 WD 0145+234
Exoplanets α Arietis b HD 12661 b c HIP 14810 b c d Teegarden's Star b c WASP-11b/HAT-P-10b
Galaxies	NGC 677 680 691 694 695 716 765 770 772 781 803 817 820 821 871 877 900 901 903 904 918 935 938 972 990 992 1024 1134 1156 Other 1ES 0229+200 3C 79 4C +28.07 AO 0235+164 IC 167 IC 1801 PSO J0309+27 Segue 2 UGC 2140
Galaxy clusters MS 0302+17
Astronomical events GRB 060218
Category

• K-type giants
• Double stars
• Aries (constellation)
• Durchmusterung objects
• Henry Draper Catalogue objects
• Hipparcos objects
• Bright Star Catalogue objects