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1 Arietis

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Double star in the constellation Aries
1 Arietis
Observation data
Epoch J2000      Equinox J2000
Constellation Aries
Right ascension 01 50 08.56984
Declination +22° 16′ 31.2100″
Apparent magnitude (V) 5.86 (6.4/7.2)
Characteristics
Spectral type K1 III + A6 V
U−B color index +0.5
B−V color index +0.74
Astrometry
Radial velocity (Rv)6.95±0.13 km/s
Proper motion (μ) RA: –16.52 mas/yr
Dec.: –8.25 mas/yr
Parallax (π)5.57 ± 0.75 mas
Distanceapprox. 590 ly
(approx. 180 pc)
Absolute magnitude (MV)−0.39
Details
Luminosity141.51 L
Other designations
1 Ari, BD+21°243, HIP 8544, HR 530, SAO 74966, ADS 1457, WDS J01501+2217
1 Ari A: HD 11154.
1 Ari B: HD 11155.
Database references
SIMBADdata

1 Arietis is a double star in the northern constellation of Aries. 1 Arietis is the Flamsteed designation. The pair have a combined visual magnitude of 5.86, making it faintly visible to the naked eye. Based upon an annual parallax shift of 5.57 mas, the distance to the two stars is approximately 590 light-years (180 parsecs). As of 2016, the secondary had an angular separation of 2.90 along a position angle of 165° from the primary. They are moving further from the Earth with a heliocentric radial velocity of +7 km/s.

The brighter star, designated component A, is a magnitude 6.40 giant star with a stellar classification of K1 III. The companion star, component B, is a magnitude 7.20 A-type main sequence star with a classification of A6 V. Helmut Abt (1985) had this star classified as A3 IV, matching a more evolved subgiant.

References

  1. ^ 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. S2CID 18759600.
  2. ^ Nicolet, B. (1978). "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System". Astronomy and Astrophysics Supplement Series. 34: 1–49. Bibcode:1978A&AS...34....1N.
  3. ^ Eggleton, P. P.; Tokovinin, A. A. (2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. S2CID 14878976.
  4. ^ 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.
  5. "* 1 Ari". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-07-18.
  6. Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466–3471, Bibcode:2001AJ....122.3466M, doi:10.1086/323920.
  7. Abt, H. A. (September 1985), "Visual multiples. VIII - 1000 MK types", Astrophysical Journal Supplement Series, 59: 95–112, Bibcode:1985ApJS...59...95A, doi:10.1086/191064

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