R Ursae Minoris
| 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] |
| 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 | |
| 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
[edit]- ^ "Download Data". aavso.org. AAVSO. Retrieved 1 October 2021.
- ^ 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.
- ^ a b c d Watson, Christopher (4 January 2010). "RR Ursae Minoris". AAVSO Website. American Association of Variable Star Observers. Retrieved 10 March 2015.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ "R UMi". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-10-10.
- ^ 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.
- ^ 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.
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