S Ursae Minoris

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S Ursae Minoris
SUMiLightCurve.png
The visual band light curve of S Ursae Minoris, from AAVSO data [1]
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

  1. ↑ "Download Data". aavso.org. AAVSO. Retrieved 1 October 2021.
  2. 1 2 3 4 5 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.
  3. 1 2 3 4 Watson, Christopher (4 January 2010). "S Ursae Minoris". AAVSO Website. American Association of Variable Star Observers . Retrieved 25 August 2025.
  4. 1 2 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.
  5. 1 2 3 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.
  6. ↑ 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.
  7. ↑ "S UMi". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2019-10-10.
  8. ↑ 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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