RR Ursae Minoris

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RR Ursae Minoris
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Ursa Minor
Right ascension 14h 57m 35.00729s [1]
Declination +65° 55′ 56.8569″ [1]

RR Ursae Minoris (RR UMi, also this is, probably, Tau Ursae Minoris) is a star in the constellation Ursa Minor. A red giant of spectral type M5III, it is a semiregular variable ranging from magnitude 4.44 to 4.85 over a period of 43.3 days.[2] It has been speculated that it might be a spectroscopic binary, but no evidence of a companion has been confirmed.[3]


  1. ^ a b c SIMBAD, RR Ursae Minoris (accessed 3 March 2013)
  2. ^ Otero, Sebastian Alberto (16 November 2009). "RR Ursae Minoris". AAVSO Website. American Association of Variable Star Observers. Retrieved 18 May 2014. 
  3. ^ Batten, A. H.; Fletcher, J. M. (1985). "A revised spectroscopic orbit for RR Ursae Minoris". Astronomical Society of the Pacific 98: 647–50. Bibcode:1986PASP...98..647B. doi:10.1086/131808.