S Ursae Minoris

S Ursae Minoris
	; The visual band light curve of S Ursae Minoris, from AAVSO data
Observation data; Epoch J2000 Equinox J2000
Constellation	Ursa Minor
Right ascension	15h 29m 34.5775s
Declination	+78° 38′ 00.2742″
Apparent magnitude (V)	7.5-<13.2
Characteristics
Evolutionary stage	AGB
Spectral type	M6e-M9e
Variable type	Mira
Astrometry
Proper motion (μ)	RA: −30.986±0.303 mas/yr ; Dec.: 7.006±0.309 mas/yr
Parallax (π)	2.5455±0.1578 mas
Distance	1,280 ± 80 ly ; (390 ± 20 pc)
Details
Mass	2.3 M☉
Radius	744 R☉
Luminosity	3,896 L☉
Surface gravity (log g)	1.63 cgs
Temperature	3,457 K
Other designations
	S UMi, HD 139492, HIP 75847
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

^ "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.

This variable star–related article is a stub. You can help Wikipedia by expanding it.

[aavso-1] "Download Data". aavso.org. AAVSO. Retrieved 1 October 2021.

[Gaia_DR2-2] 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.

[AAVSOs-3] Watson, Christopher (4 January 2010). "S Ursae Minoris". AAVSO Website. American Association of Variable Star Observers. Retrieved 25 August 2025.

[lm2025-4] 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.

[khalatyan2024-5] 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.

[kervella2022-6] 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.

[Simbad-7] "S UMi". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-10-10.

[AHCO1907-8] 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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Observation data Epoch J2000 Equinox J2000
The visual band light curve of S Ursae Minoris, from AAVSO data^[1]
Constellation	Ursa Minor
Right ascension	15^h 29^m 34.5775^s^[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

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