Astronomy:S Pegasi
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Short description: Variable star in the constellation Pegasus
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Pegasus |
| Right ascension | 23h 20m 32.61474s[2] |
| Declination | +08° 55′ 08.1627″[2] |
| Apparent magnitude (V) | 6.9–13.8[3][4] |
| Characteristics | |
| Spectral type | M5e – M8.5e[4] |
| Variable type | Mira[4] |
| Astrometry | |
| Radial velocity (Rv) | 5.0±4.6[5] km/s |
| Proper motion (μ) | RA: −18.494[2] mas/yr Dec.: −17.197[2] mas/yr |
| Parallax (π) | 1.399 ± 0.083[6] mas |
| Distance | 2,300 ± 100 ly (710 ± 40 pc) |
| Details | |
| Radius | 278–316[6] R☉ |
| Luminosity | 6,545+583 −531[6] L☉ |
| Surface gravity (log g) | −0.45 to −0.39[6] cgs |
| Temperature | 2,910–2,932[6] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
S Pegasi (S Peg) is a Mira variable star in the constellation Pegasus located about 2,300 light-years away. It varies between apparent magnitude 6.9 and 13.8 with a period of 319 days (10 months),[3][4] representing a nearly 600–fold change in brightness. S Pegasi enters solar conjunction and is hidden by the Sun's glare each year from late February through late March. It reaches opposition in mid-September, when it is visible all night.
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.[7]
References
- ↑ "Download Data". AAVSO. https://www.aavso.org/data-download.
- ↑ 2.0 2.1 2.2 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 3.0 3.1 "S Peg". AAVSO Website. American Association of Variable Star Observers. http://www.aavso.org/vsx/index.php?view=detail.top&oid=25124. Retrieved 30 June 2026.
- ↑ 4.0 4.1 4.2 4.3 Samus, N. N. 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.
- ↑ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. Bibcode: 2006AstL...32..759G.
- ↑ 6.0 6.1 6.2 6.3 6.4 Béguin, E.; Chiavassa, A.; Ahmad, A.; Freytag, B.; Uttenthaler, S. (2024-10-01). "Retrieving stellar parameters and dynamics of AGB stars with Gaia parallax measurements and CO5BOLD RHD simulations" (in en). Astronomy & Astrophysics 690: A125. doi:10.1051/0004-6361/202450245. ISSN 0004-6361.
- ↑ Serkowski, Krzysztof; Shawl, Stephen J. (2001). "Polarimetry of 167 Cool Variable Stars: Data". The Astronomical Journal 122 (4): 2017. doi:10.1086/323105. Bibcode: 2001AJ....122.2017S.
External links
- S Peg lightcurve at AAVSO
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