87 Pegasi
Variable Star in the constellation Pegasus
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87 Pegasi (also known as HD 448) is a red giant star located in the northern constellation of Pegasus. With an apparent visual magnitude of 5.56, it is faintly visible to the naked eye under dark skies but requires good conditions or binoculars for reliable observation.[3]
 | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Pegasus[1] |
| Right ascension | 00h 09m 02.42s[2] |
| Declination | +18° 12′ 43.1″[2] |
| Apparent magnitude (V) | 5.53[3] |
| Characteristics | |
| Evolutionary stage | horizontal branch[4] |
| Spectral type | G9III[5] |
| B−V color index | +1.04[1] |
| Astrometry | |
| Radial velocity (Rv) | −19.85±0.13[2] km/s |
| Proper motion (μ) | RA: +140.876[2] mas/yr Dec.: −25.250[2] mas/yr |
| Parallax (π) | 10.8284±0.0698 mas[2] |
| Distance | 301 ± 2 ly (92.3 ± 0.6 pc) |
| Absolute magnitude (MV) | +0.86[1] |
| Details | |
| Mass | 1.81[6] M☉ |
| Radius | 9.8[7] R☉ |
| Luminosity | 56[7] L☉ |
| Surface gravity (log g) | 2.70[7] cgs |
| Temperature | 4,811[6] K |
| Metallicity [Fe/H] | +0.04[6] dex |
| Age | 1.77[6] Gyr |
| Other designations | |
| 87 Pegasi, AG+17 13, BD+17 7, HD 448, HIP 729, HR 22, SAO 91734, PPM 116172, TIC 258877786, TYC 1181-1782-1, GCRV 68, GSC 01181-01782, IRAS 00064+1756, 2MASS J00090243+1812432, Gaia DR3 2797074778388646016[8] | |
| Database references | |
| SIMBAD | data |
Observation
The star was observed in ultraviolet by NASA's GALEX satellite to find correlation between chromosphere and coronal activity with many other red giant stars.[9]
