10 Arietis

10 Arietis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Aries
Right ascension  02h 03m 39.34547s[1]
Declination +25° 56′ 07.7129″[1]
Apparent magnitude (V) 5.63[2]
Spectral type F8 IV + F9 V[2]
Radial velocity (Rv)+12.9[3] km/s
Proper motion (μ) RA: +128.01[1] mas/yr
Dec.: +11.19[1] mas/yr
Parallax (π)20.53 ± 0.67[1] mas
Distance159 ± 5 ly
(49 ± 2 pc)
Absolute magnitude (MV)2.21[3]
Period (P)325 yr
Semi-major axis (a)1.39″
Eccentricity (e)0.59
Inclination (i)51°
Longitude of the node (Ω)20.5°
Periastron epoch (T)B1931.6
Argument of periastron (ω)
Metallicity [Fe/H]–0.10[3] dex
Age1.9[3] Gyr
Other designations
10 Ari, BD+25°341, HD 12558, HIP 9621, HR 605, SAO 75114, ADS 1631, WDS 02037+2556AB[5]
Database references

10 Arietis is a binary star[6] system in the northern constellation of Aries. 10 Arietis is the Flamsteed designation. It is visible to the naked eye as a dim, yellow-white hued star with a combined apparent visual magnitude of 5.63.[2] Based upon parallax measurements, it is located around 159 light years away from the Sun. The system is receding from the Earth with a heliocentric radial velocity of +12.9 km/s.[3]

The pair orbit each other with a period of approximately 325 years and an eccentricity of 0.59. The semimajor axis of the orbit has an angular size of 1.39.[4] The magnitude 5.92[6] primary, designated component A, is an aging F-type subgiant star with a stellar classification of F8 IV.[2] The secondary star, component B, is a magnitude 7.95[6] F-type main-sequence star with a stellar classification of F9 V.[2] There is a magnitude 13.5 visual companion, designated component C, at an angular separation of 95.30″ along a position angle of 150°, as of 2001.[7]


  1. ^ a b c d e van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
  2. ^ a b c d e Edwards, T. W. (April 1976), "MK classification for visual binary components", Astronomical Journal, 81: 245–249, Bibcode:1976AJ.....81..245E, doi:10.1086/111879.
  3. ^ a b c d e Holmberg, J.; Nordström, B.; Andersen, J. (July 2009), "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics", Astronomy and Astrophysics, 501 (3): 941–947, arXiv:0811.3982, Bibcode:2009A&A...501..941H, doi:10.1051/0004-6361/200811191.
  4. ^ a b Heintz, W. D. (August 1996), "Observations of Double Stars and New Pairs. XVII", Astrophysical Journal Supplement, 105: 475, Bibcode:1996ApJS..105..475H, doi:10.1086/192324
  5. ^ "10 Ari". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-06-02.
  6. ^ a b c Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
  7. ^ Mason, B. D.; et al. (2014), The Washington Visual Double Star Catalog, Bibcode:2001AJ....122.3466M, doi:10.1086/323920, retrieved 2015-07-22

External links[]

Coordinates: Sky map 02h 03m 39.344s, +25° 56′ 07.70″