From Wikipedia, the free encyclopedia
R Ursae Minoris
A visual band light curve for R Ursae Minoris, plotted from AAVSO data [1]
Observation data
Epoch J2000       Equinox J2000
Constellation Ursa Minor
Right ascension 16h 29m 57.8923s [2]
Declination +72° 16′ 49.166″ [2]
Apparent magnitude (V) 8.5-11.5 [3]
Spectral type M7IIIe [3]
Variable type semiregular variable [3]
Proper motion (μ) RA: 11.973±0.085 [2]  mas/ yr
Dec.: 13.976±0.092 [2]  mas/ yr
Parallax (π)2.6648 ± 0.0629  mas [2]
Distance1,220 ± 30  ly
(375 ± 9  pc)
Absolute magnitude (MV)+2.461 [4] (var)
Mass1.71 [5]  M
Radius686 [6]  R
Surface gravity (log g)−0.46 [5]  cgs
Temperature2,875 [5]  K
Metallicity [Fe/H]+0.07 [5]  dex
Other designations
R UMi, BD+72°732a, HD 149683, HIP 80802 [7]
Database references

R Ursae Minoris is a star in the constellation Ursa Minor. A red giant of spectral type M7IIIe, it is a semiregular variable ranging from magnitude 8.5 to 11.5 over a period of 325 days. [3]


  1. ^ "Download Data". AAVSO. Retrieved 1 October 2021.
  2. ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv: 2012.01533. Bibcode: 2021A&A...649A...1G. doi: 10.1051/0004-6361/202039657. S2CID  227254300. (Erratum:  doi: 10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  3. ^ a b c d Watson, Christopher (4 January 2010). "RR Ursae Minoris". AAVSO Website. American Association of Variable Star Observers. Retrieved 10 March 2015.
  4. ^ Gontcharov, G. A. (2017). "VizieR Online Data Catalog: Tycho-2 red giant branch and carbon stars (Gontcharov, 2011)". VizieR On-Line Data Catalog. Bibcode: 2017yCat..90370769G.
  5. ^ a b c d Anders, F.; Khalatyan, A.; Queiroz, A. B. A.; Chiappini, C.; Ardevol, J.; Casamiquela, L.; Figueras, F.; Jimenez-Arranz, O.; Jordi, C.; Monguio, M.; Romero-Gomez, M.; Altamirano, D.; Antoja, T.; Assaad, R.; Cantat-Gaudin, T.; Castro-Ginard, A.; Enke, H.; Girardi, L.; Guiglion, G.; Khan, S.; Luri, X.; Miglio, A.; Minchev, I.; Ramos, P.; Santiago, B. X.; Steinmetz, M. (2022). "VizieR Online Data Catalog: StarHorse2, Gaia EDR3 photo-astrometric distances (Anders+, 2022)". Vizier Online Data Catalog. Bibcode: 2022yCat.1354....0A.
  6. ^ Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (2022). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics. 657: A7. Bibcode: 2022A&A...657A...7K. doi: 10.1051/0004-6361/202142146. S2CID  237605138.
  7. ^ "R UMi". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-10-10.