UX Arietis

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UX Arietis
Observation data
Epoch J2000      Equinox J2000
Constellation Aries
Right ascension 03h 26m 35.38922s[1]
Declination +28° 42′ 54.3169″[1]
Apparent magnitude (V) 6.47[2]
Spectral type G5IV[3]
U−B color index 0.43[2]
B−V color index 0.90[2]
Variable type RS CVn[4]
Radial velocity (Rv) +26.53[5] km/s
Proper motion (μ) RA: +41.65 mas/yr
Dec.: −104.03 mas/yr
Parallax (π) 19.37 ± 0.70[1] mas
Distance 168 ± 6 ly
(52 ± 2 pc)
Period (P) 6.437855 days
Semi-major axis (a) 1.71 mas
Inclination (i) 59.2°
Longitude of the node (Ω) 82°
Periastron epoch (T) 2450642.00075
Argument of periastron (ω)
Mass 5.70[3] M
Temperature 4,750[3] K
Rotation 6.44 d[3]
Other designations
BD+28° 532, CCDM 03266+2843, HD 21242, HIP 16042, SAO 75927.
Database references

UX Arietis is a variable star of the RS CVn type, located in the northern zodiacal constellation of Aries. Based upon parallax measurements from the Hipparcos satellite, it is roughly 168 light years away.[1] The variability of the star is believed due to a combination of cool star spots and warm flares, set against the baseline quiescent temperature of the stellar atmosphere. The variability appears to be cyclical with a period of 8−9 years.[4]


  1. ^ a b c d van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752Freely accessible, doi:10.1051/0004-6361:20078357 Vizier catalog entry
  2. ^ a b c Guetter, H. H.; Hewitt, A. V. (June 1984), "Photoelectric UBV photometry for 317 PZT and VZT stars", Publications of the Astronomical Society of the Pacific, 96: 441–443, Bibcode:1984PASP...96..441G, doi:10.1086/131362 
  3. ^ a b c d Strassmeier, Klaus G. (September 2009), "Starspots", The Astronomy and Astrophysics Review, 17 (3): 251–308, Bibcode:2009A&ARv..17..251S, doi:10.1007/s00159-009-0020-6 
  4. ^ a b Alekseev, I. Yu. (September 2014), "Three-Component Model of Spottedness in the Classical RS CVn System UX Ari", Astrophysics, 57 (3): 344–351, Bibcode:2014Ap.....57..344A, doi:10.1007/s10511-014-9339-4 
  5. ^ Karataş, Y.; et al. (April 2004), "Kinematics of chromospherically active binaries and evidence of an orbital period decrease in binary evolution", Monthly Notices of the Royal Astronomical Society, 349 (3): 1069–1092, Bibcode:2004MNRAS.349.1069K, arXiv:astro-ph/0404219Freely accessible, doi:10.1111/j.1365-2966.2004.07588.x 
  6. ^ "Sixth Catalog of Orbits of Visual Binary Stars". 

Further reading[edit]

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