Tau Pegasi
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Pegasus |
| Right ascension | 23h 20m 38.24188s[1] |
| Declination | +23° 44′ 25.2098″[1] |
| Apparent magnitude (V) | +4.59[2] |
| Characteristics | |
| Spectral type | G6 III |
| Astrometry | |
| Radial velocity (Rv) | +15.20 ± 1.6 km/s |
| Proper motion (μ) | RA: 29.45 ± 0.33[1] mas/yr Dec.: –9.53 ± 0.27[1] mas/yr |
| Parallax (π) | 20.17 ± 0.40[1] mas |
| Distance | 162 ± 3 ly (49.6 ± 1.0 pc) |
| Other designations | |
Tau Pegasi (τ Peg, τ Pegasi) is a 4.6 magnitude star in the constellation Pegasus. The star has also the traditional names Salm,[3][4] Kerb[4] (or El Khereb[4]) and Markab, a name shared with α Pegasi, k Puppis and κ Velorum. τ Pegasi belongs to the spectral class A5 Vp, making it an A-type main sequence star.
This is a Delta Scuti variable star with a pulsation period of 0.94 hours. It is rotating rapidly with a projected rotational velocity of 150 km s−1. Tau Pegasi is radiating nearly 30 times the luminosity of the Sun from its outer atmosphere at an effective temperature of 7,762 K.[5]
References
- 1 2 3 4 5 van Leeuwen, F. (November 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
- 1 2 SIMBAD, Tau Pegasi (accessed 16 March 2016)
- ↑ Allen, Richard Hinckley (1899). Star-names and their meanings. New York, Leipzig [etc.] G.E. Stechert. p. 329.
- 1 2 3 HD-DM-GC-HR-HIP-Bayer-Flamsteed Cross Index (Kostjuk, 2002)
- ↑ Balona, L. A.; Dziembowski, W. A. (October 1999), "Excitation and visibility of high-degree modes in stars", Monthly Notices of the Royal Astronomical Society 309 (1): 221–232, Bibcode:1999MNRAS.309..221B, doi:10.1046/j.1365-8711.1999.02821.x
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