Tau Pegasi

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Tau Pegasi
Observation data
Epoch 2000      Equinox 2000
Constellation Pegasus
Right ascension 23h 20m 38.24188s
Declination +23° 44′ 25.2098″
Apparent magnitude (V) +4.59
Distance 165.9 ly
(50.9 pc)
Spectral type G0
Other designations
HD 220061, HIP 115250, SAO 91186
Database references

Tau Pegasi (τ Peg, τ Pegasi) is a 4.6 magnitude star in the constellation Pegasus. The star has also the traditional names Salm,[1][2] Kerb[2] (or El Khereb[2]) 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.[3]


  1. ^ Allen, Richard Hinckley (1899). Star-names and their meanings. New York, Leipzig [etc.] G.E. Stechert. p. 329. 
  2. ^ a b c HD-DM-GC-HR-HIP-Bayer-Flamsteed Cross Index (Kostjuk, 2002)
  3. ^ 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