47 Arietis

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47 Arietis
Observation data
Epoch J2000      Equinox J2000
Constellation Aries
Right ascension  02h 58m 05.22219s[1]
Declination +20° 40′ 07.4544″[1]
Apparent magnitude (V) 5.80[2]
Spectral type F5 V(e)[3] or F5 IV[4]
U−B color index 0.01[2]
B−V color index 0.41[2]
Radial velocity (Rv)+26.6±0.4[5] km/s
Proper motion (μ) RA: +235.57[1] mas/yr
Dec.: −30.09[1] mas/yr
Parallax (π)30.15 ± 0.30[1] mas
Distance108 ± 1 ly
(33.2 ± 0.3 pc)
Absolute magnitude (MV)+3.28[6]
Mass1.55[7] M
Luminosity4.43[8] L
Surface gravity (log g)4.19±0.14[7] cgs
Temperature6,633±226[7] K
Metallicity [Fe/H]+0.09[9] dex
Rotational velocity (v sin i)25[10] km/s
Age2.052[7] Gyr
Other designations
47 Aqr, BD+20° 480, FK5 1081, HD 18404, HIP 13834, HR 878, SAO 75662, WDS J02581+2040A, GSC 1230:1425[11]
Database references

47 Arietis is a single[12] star in the northern constellation of Aries. The designation is from the star catalogue of English astronomer John Flamsteed, first published in 1712, it is faintly visible to the naked eye with an apparent visual magnitude of 5.80.[2] It has an annual parallax shift of 30.15 ± 0.30 mas,[1] which is equivalent to a physical distance of approximately 108 light-years (33 parsecs) from Earth.

The star is moving further from the Sun with a radial velocity of +26.6 km/s.[5] It has a relatively high proper motion, traversing the celestial sphere at the rate of 0.237 arc seconds per year.[13] The combination of these movements indicate this star is a member of the Hyades supercluster.[14][15]

Li et al. (2000) categorized this as an F-type main-sequence star with a stellar classification of F5 V(e).[3] Previously, Cowley (1976) listed a class of F5 IV, which would indicate it is a subgiant star,[4][15] it is most likely (97.8% chance) the source of X-ray emission that is detected at these coordinates,[16] and it is a radio source.[17] The star has 1.55[7] times the mass of the Sun and is radiating 4.43[8] times the Sun's luminosity from its photosphere at an effective temperature of roughly 6,633 K.[7]

47 Arietis has a red dwarf companion at an angular separation of 14.8 arc seconds along a position angle of 113°, as of 1998. This star has a class of M3.5 and an infrared J-band magnitude of 10.47.[18]


  1. ^ a b c d e f van Leeuwen, F. (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 Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99), Bibcode:1966CoLPL...4...99J.
  3. ^ a b Li, J. Z.; et al. (April 2000), "New discovery of weak-line T Tauri stars in high-Galactic latitude molecular clouds", Astronomy and Astrophysics, 356: 157–162, Bibcode:2000A&A...356..157L.
  4. ^ a b Cowley, A. P. (April 1976), "Spectral classification of the bright F stars", Publications of the Astronomical Society of the Pacific, 88: 95–110, Bibcode:1976PASP...88...95C, doi:10.1086/129905.
  5. ^ a b Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, arXiv:1606.08053, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065.
  6. ^ Eggen, Olin J. (July 1998), "The Age Range of Hyades Stars", The Astronomical Journal, 116 (1): 284–292, Bibcode:1998AJ....116..284E, doi:10.1086/300413.
  7. ^ a b c d e f David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146.
  8. ^ a b 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.
  9. ^ Casagrande, L.; et al. (June 2011), "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey", Astronomy and Astrophysics, 530: A138, arXiv:1103.4651, Bibcode:2011A&A...530A.138C, doi:10.1051/0004-6361/201016276.
  10. ^ Mizusawa, Trisha F.; et al. (November 2012), "Exploring the Effects of Stellar Rotation and Wind Clearing: Debris Disks around F Stars", The Astronomical Journal, 144 (5): 16, arXiv:1208.6248, Bibcode:2012AJ....144..135M, doi:10.1088/0004-6256/144/5/135, 135.
  11. ^ "47 Ari". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-02-06.
  12. ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
  13. ^ Lépine, Sébastien; Shara, Michael M. (March 2005), "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)", The Astronomical Journal, 129 (3): 1483–1522, arXiv:astro-ph/0412070, Bibcode:2005AJ....129.1483L, doi:10.1086/427854.
  14. ^ de Bruijne, J. H. J.; et al. (February 2001), "A Hipparcos study of the Hyades open cluster. Improved colour-absolute magnitude and Hertzsprung-Russell diagrams", Astronomy and Astrophysics, 367 (1): 111–147, arXiv:astro-ph/0011565, Bibcode:2001A&A...367..111D, doi:10.1051/0004-6361:20000410.
  15. ^ a b Montes, D.; et al. (November 2001), "Late-type members of young stellar kinematic groups – I. Single stars" (PDF), Monthly Notices of the Royal Astronomical Society, 328 (1): 45–63, arXiv:astro-ph/0106537, Bibcode:2001MNRAS.328...45M, doi:10.1046/j.1365-8711.2001.04781.x.
  16. ^ Haakonsen, Christian Bernt; Rutledge, Robert E. (September 2009), "XID II: Statistical Cross-Association of ROSAT Bright Source Catalog X-ray Sources with 2MASS Point Source Catalog Near-Infrared Sources", The Astrophysical Journal Supplement, 184 (1): 138–151, arXiv:0910.3229, Bibcode:2009ApJS..184..138H, doi:10.1088/0067-0049/184/1/138.
  17. ^ Wendker, H. J. (June 2015), VizieR Online Data Catalog VIII/99: Catalogue of Radio Stars (Wendker, 2001), Bibcode:2015yCat.8099....0W.
  18. ^ Scholz, R. -D. (March 2016), "Overlooked wide companions of nearby F stars", Astronomy & Astrophysics, 587: 8, arXiv:1601.01896, Bibcode:2016A&A...587A..51S, doi:10.1051/0004-6361/201527965, A51

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