Nu Pegasi
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Pegasus |
| Right ascension | 22h 05m 40.75170s |
| Declination | +05° 03′ 30.7201″ |
| Apparent magnitude (V) | 4.84 |
| Characteristics | |
| Evolutionary stage | red giant branch |
| Spectral type | K4III |
| U−B color index | +1.80 |
| B−V color index | +1.44 |
| Variable type | suspected |
| Astrometry | |
| Radial velocity (Rv) | −18.90 km/s |
| Proper motion (μ) | RA: +101.759 mas/yr Dec.: +100.923 mas/yr |
| Parallax (π) | 12.4810±0.3322 mas |
| Distance | 261 ± 7 ly (80 ± 2 pc) |
| Absolute magnitude (MV) | 0.26 |
| Details | |
| Mass | 1.13 M☉ |
| Radius | 24.57 R☉ |
| Luminosity | 149 L☉ |
| Surface gravity (log g) | 1.72 cgs |
| Temperature | 4,073 K |
| Metallicity [Fe/H] | +0.02 dex |
| Rotational velocity (v sin i) | 2.3 km/s |
| Age | 8.1+2.3 −0.4 Gyr |
| Other designations | |
| ν Peg, 22 Pegasi, NSV 14020, BD+04°4800, GC 30894, HD 209747, HIP 109068, HR 8413, SAO 127285 | |
| Database references | |
| SIMBAD | data |
ν Pegasi, Latinized as Nu Pegasi is a single star in the northern constellation of Pegasus. It is an orange-hued star that is faintly visible to the naked eye with an apparent visual magnitude of 4.84. The star is located approximately 261 light years away based on parallax, but is drifting closer with a radial velocity of −19 km/s.
This is an aging giant star, most likely (94% chance) on the red giant branch, with a stellar classification of K4III. It is a suspected variable, with a magnitude range observed from 4.83 to 4.86. With the supply of hydrogen at its core exhausted, the star has cooled and expanded to 24.6 times the Sun's radius. It is 13% more massive than the Sun and is radiating 149 times the Sun's luminosity from its swollen photosphere at an effective temperature of 4,073 K.