S Ursae Minoris
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ursa Minor |
| Right ascension | 15h 29m 34.5775s[2] |
| Declination | +78° 38′ 00.2742″[2] |
| Apparent magnitude (V) | 7.5-<13.2[3] |
| Characteristics | |
| Evolutionary stage | AGB[4] |
| Spectral type | M6e-M9e[3] |
| Variable type | Mira[3] |
| Astrometry | |
| Proper motion (μ) | RA: −30.986±0.303[2] mas/yr Dec.: 7.006±0.309[2] mas/yr |
| Parallax (π) | 2.5455±0.1578 mas[2] |
| Distance | 1,280 ± 80 ly (390 ± 20 pc) |
| Details | |
| Mass | 2.3[5] M☉ |
| Radius | 744[6] R☉ |
| Luminosity | 3,896[4] L☉ |
| Surface gravity (log g) | 1.63[5] cgs |
| Temperature | 3,457[5] K |
| Other designations | |
| S UMi, HD 139492, HIP 75847[7] | |
| Database references | |
| SIMBAD | data |
S Ursae Minoris (S UMi) is a Mira variable star in the constellation Ursa Minor, ranging from magnitude 7.5 to fainter than 13.2 over a period of 331 days.[3]
Williamina Fleming discovered that the star's brightness varies, in 1895.[8]
References
[edit]- ^ "Download Data". aavso.org. AAVSO. Retrieved 1 October 2021.
- ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ a b c d Watson, Christopher (4 January 2010). "S Ursae Minoris". AAVSO Website. American Association of Variable Star Observers. Retrieved 25 August 2025.
- ^ a b López Martí, B.; Jiménez-Esteban, F. M.; Engels, D.; García-Lario, P. (2025). "The Gaia Catalogue of Galactic AGB Stars: I. OH/IR stars". Astronomy and Astrophysics. 698. arXiv:2504.20475. Bibcode:2025A&A...698A.109L. doi:10.1051/0004-6361/202453125.
- ^ a b c Khalatyan, A.; Anders, F.; Chiappini, C.; Queiroz, A. B. A.; Nepal, S.; Dal Ponte, M.; Jordi, C.; Guiglion, G.; Valentini, M.; Torralba Elipe, G.; Steinmetz, M.; Pantaleoni-González, M.; Malhotra, S.; Jiménez-Arranz, Ó.; Enke, H.; Casamiquela, L.; Ardèvol, J. (2024). "Transferring spectroscopic stellar labels to 217 million Gaia DR3 XP stars with SHBoost". Astronomy and Astrophysics. 691: A98. arXiv:2407.06963. Bibcode:2024A&A...691A..98K. doi:10.1051/0004-6361/202451427.
- ^ Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (2022). "Stellar and substellar companions from Gaia EDR3. Proper-motion anomaly and resolved common proper-motion pairs". Astronomy and Astrophysics. 657. arXiv:2109.10912. Bibcode:2022A&A...657A...7K. doi:10.1051/0004-6361/202142146.
- ^ "S UMi". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-10-10.
- ^ Cannon, Annie J. (1907). "Second catalogue of variable stars". Annals of Harvard College Observatory. 55: 1–94. Bibcode:1907AnHar..55....1C. Retrieved 24 August 2025.
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