Tau Pegasi
Star in the constellation Pegasus / From Wikipedia, the free encyclopedia
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.
Quick Facts Constellation, Right ascension ...
Observation data Epoch J2000.0 Equinox J2000.0 | |
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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] |
Distance | 162 ± 3 ly (49.6 ± 1.0 pc) |
Absolute magnitude (MV) | 1.10[2] |
Details | |
Mass | 2.14[8] M☉ |
Radius | 2.8[9] R☉ |
Luminosity | 32[8] L☉ |
Surface gravity (log g) | 3.88[10] cgs |
Temperature | 7,709[8] K |
Metallicity [Fe/H] | −0.28[2] dex |
Rotational velocity (v sin i) | 149[8] km/s |
Other designations | |
Database references | |
SIMBAD | data |
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