Tau Pegasi

Tau Pegasi
Location of τ Pegasi (circled)
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) +4.58[2]
Characteristics
Spectral type A5 Vp[3]
A8V(n)kA5mA5 (λ Boo)[4]
U−B color index +0.13[5]
B−V color index +0.17[5]
Variable type δ Sct[6]
Astrometry
Radial velocity (Rv)+15.20±1.6[7] 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 mas[1]
Distance162 ± 3 ly
(49.6 ± 1.0 pc)
Absolute magnitude (MV)1.10[2]
Details
Mass2.14[8] M☉
Radius2.8[9] R☉
Luminosity32[8] L☉
Surface gravity (log g)3.88[10] cgs
Temperature7,709[8] K
Metallicity [Fe/H]−0.28[2] dex
Rotational velocity (v sin i)149[8] km/s
Other designations
Salm, 62 Pegasi, BD+22°4810, FK5 880, GC 32503, HIP 115250, HR 8880, HD 220061, SAO 91186
Database references
SIMBADdata

Tau Pegasi (τ Pegasi, abbreviated Tau Peg, τ Peg), formally named Salm /ˈsɑːm/,[11] is a magnitude 4.6 star 162 light years away in the constellation of Pegasus. With about twice the mass of the Sun and thirty times as luminous, it is a δ Scuti variable star with its brightness changing by a few hundredths of a magnitude over about an hour.

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