Tau Pegasi
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Pegasus |
| Right ascension | 23h 20m 38.24188s |
| Declination | +23° 44′ 25.2098″ |
| Apparent magnitude (V) | +4.58 |
| Characteristics | |
| Spectral type | A5 Vp A8V(n)kA5mA5 (λ Boo) |
| U−B color index | +0.13 |
| B−V color index | +0.17 |
| Variable type | δ Sct |
| Astrometry | |
| Radial velocity (Rv) | +15.20±1.6 km/s |
| Proper motion (μ) | RA: 29.45±0.33 mas/yr Dec.: −9.53±0.27 mas/yr |
| Parallax (π) | 20.17±0.40 mas |
| Distance | 162 ± 3 ly (49.6 ± 1.0 pc) |
| Absolute magnitude (MV) | 1.10 |
| Details | |
| Mass | 2.14 M☉ |
| Radius | 2.8 R☉ |
| Luminosity | 32 L☉ |
| Surface gravity (log g) | 3.88 cgs |
| Temperature | 7,709 K |
| Metallicity [Fe/H] | −0.28 dex |
| Rotational velocity (v sin i) | 149 km/s |
| Other designations | |
| Salm, 62 Pegasi, BD+22°4810, FK5 880, GC 32503, HIP 115250, HR 8880, HD 220061, SAO 91186 | |
| Database references | |
| SIMBAD | data |
Tau Pegasi (τ Pegasi, abbreviated Tau Peg, τ Peg), formally named Salm /ˈsɑːm/, 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.