R Ursae Minoris

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	16^h 29^m 57.8923^s[2]
Declination	+72° 16′ 49.166″[2]
Apparent magnitude (V)	8.5-11.5[3]
Characteristics
Spectral type	M7IIIe[3]
Variable type	semiregular variable[3]
Astrometry
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]
Distance	1,220 ± 30 ly (375 ± 9 pc)
Absolute magnitude (MV)	+2.461[4] (var)
Details
Mass	1.71[5] M☉
Radius	686[6] R☉
Surface gravity (log g)	−0.46[5] cgs
Temperature	2,875[5] K
Metallicity [Fe/H]	+0.07[5] dex
Other designations
R UMi, BD+72°732a, HD 149683, HIP 80802[7]
Database references
SIMBAD	data

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]

In 1881, Edward Charles Pickering announced that the star, at that time unnamed, is a variable star.^[8] It was listed with its variable star designation, R Ursae Minoris, in Annie Jump Cannon's 1907 work Second Catalog of Variable Stars.^[9]

References

1. "Download Data". aavso.org. AAVSO. Retrieved 1 October 2021.
2. 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. 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. 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. arXiv:2109.10912. 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.
8. Pickering, Edward C. (November 1881). "Stars with peculiar spectra, discovered at the Astronomical Observatory of Harvard College". Astronomische Nachrichten. 101 (5): 73. Bibcode:1881AN....101...73P. doi:10.1002/asna.18821010504. Retrieved 16 December 2024.
9. Cannon, Annie J. (1907). "Second catalogue of variable stars". Annals of Harvard College Observatory. 55: 1–94. Bibcode:1907AnHar..55....1C. Retrieved 16 December 2024.