S Pegasi

S Pegasi
	; The visual band light curve of S Pegasi, from AAVSO data
Observation data; Epoch J2000 Equinox J2000
Constellation	Pegasus
Right ascension	23h 20m 32.61407s
Declination	+08° 55′ 08.1398″
Apparent magnitude (V)	6.9 - 13.8
Characteristics
Spectral type	M5e - M8.5e
Variable type	Mira
Astrometry
Parallax (π)	2.52 ± 2.26 mas
Distance	approx. 1,000 ly ; (approx. 400 pc)
Details
Radius	459 - 574 R☉
Luminosity	3,221 L☉
Temperature	2,107 K
Other designations
	S Peg, BD+08° 5047a, HD 220033, HIP 115242
Database references
SIMBAD	data

S Pegasi (S Peg) is a Mira variable star in the constellation Pegasus. It varies between magnitude 7 and 13 with a period of 319.22 days.^[3] It is believed to be pulsating in the first overtone. First overtone pulsators have masses less than 1.8 M_☉ at a temperature of 2,107 K, and less than 1.4 M_☉ at the luminosity of S Pegasi.^[5]

References

^ "Download Data". aavso.org. AAVSO. Retrieved 1 October 2021.
^ ^a ^b ^c Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv: 0708.1752. Bibcode: 2007A&A...474..653V. doi: 10.1051/0004-6361:20078357. S2CID 18759600.
^ ^a ^b ^c ^d Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode: 2009yCat....102025S.
^ Van Belle, G. T.; Thompson, R. R.; Creech-Eakman, M. J. (2002). "Angular Size Measurements of Mira Variable Stars at 2.2 Microns. II". The Astronomical Journal. 124 (3): 1706–1715. arXiv: astro-ph/0210167. Bibcode: 2002AJ....124.1706V. doi: 10.1086/342282. S2CID 33832649.
^ ^a ^b ^c Serkowski, Krzysztof; Shawl, Stephen J. (2001). "Polarimetry of 167 Cool Variable Stars: Data". The Astronomical Journal. 122 (4): 2017. Bibcode: 2001AJ....122.2017S. doi: 10.1086/323105.

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

[hipparcos-2] Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv: 0708.1752. Bibcode: 2007A&A...474..653V. doi: 10.1051/0004-6361:20078357. S2CID 18759600.

[gcvs-3] Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode: 2009yCat....102025S.

[vanbelle-4] Van Belle, G. T.; Thompson, R. R.; Creech-Eakman, M. J. (2002). "Angular Size Measurements of Mira Variable Stars at 2.2 Microns. II". The Astronomical Journal. 124 (3): 1706–1715. arXiv: astro-ph/0210167. Bibcode: 2002AJ....124.1706V. doi: 10.1086/342282. S2CID 33832649.

[serkowski-5] Serkowski, Krzysztof; Shawl, Stephen J. (2001). "Polarimetry of 167 Cool Variable Stars: Data". The Astronomical Journal. 122 (4): 2017. Bibcode: 2001AJ....122.2017S. doi: 10.1086/323105.

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Observation data Epoch J2000 Equinox J2000
The visual band light curve of S Pegasi, from AAVSO data^[1]
Constellation	Pegasus
Right ascension	23^h 20^m 32.61407^s^[2]
Declination	+08° 55′ 08.1398″^[2]
Apparent magnitude (V)	6.9 - 13.8^[3]
Characteristics
Spectral type	M5e - M8.5e^[3]
Variable type	Mira^[3]
Astrometry

Parallax (π)	2.52 ± 2.26 mas^[2]
Distance	approx. 1,000 ly (approx. 400 pc)

Details

Radius	459 - 574^[4] `R`_☉
Luminosity	3,221^[5] `L`_☉
Temperature	2,107^[5] K

Other designations
S Peg, BD+08° 5047a, HD 220033, HIP 115242
Database references
SIMBAD	data