Z Ursae Minoris

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Z Ursae Minoris
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Ursa Minor
Right ascension 15h 02m 01.477s [1]
Declination +83° 03′ 48.66″ [1]
Spectral typeC

Z Ursae Minoris (Z UMi) is a star in the constellation Ursa Minor. It was confirmed to be one of a rare class of stars—R Coronae Borealis variables—after its spectrum was analysed in 2006.[2] Initially observed to be variable in 1934, it suddenly dropped 6 magnitudes in 1992 and was subsequently diagnosed as an RcB star.[3] Up till this point it was thought to have been a long period (Mira) variable.[2]


  1. ^ a b SIMBAD, Z Ursae Minoris (accessed 18 May 2014)
  2. ^ a b Kipper, Tõnu; Klochkova, Valentina G. (2006). "A Cool R Coronae Borealis Star Z UMi". Baltic Astronomy. 15: 531–37. arXiv:0706.3271Freely accessible. Bibcode:2006BaltA..15..531K. 
  3. ^ Benson, Priscilla J.; Clayton, Geoffrey C.; Garnavich, Peter; Szkody, Paula. "Z Ursa Minoris -- a new R Coronae Borealis variable". The Astronomical Journal. 108 (1): 247–50. Bibcode:1994AJ....108..247B. doi:10.1086/117063.