Xi Pegasi
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Pegasus |
| Right ascension | 22h 46m 41.58118s |
| Declination | +12° 10′ 22.3854″ |
| Apparent magnitude (V) | 4.195 + 11.70 |
| Characteristics | |
| Spectral type | F6V + M3.5 |
| U−B color index | −0.015 |
| B−V color index | +0.502 |
| Astrometry | |
| Radial velocity (Rv) | −5.3 km/s |
| Proper motion (μ) | RA: +234.18 mas/yr Dec.: −493.29 mas/yr |
| Parallax (π) | 61.36±0.19 mas |
| Distance | 53.2 ± 0.2 ly (16.30 ± 0.05 pc) |
| Absolute magnitude (MV) | 3.25 |
| Details | |
| Xi Peg A | |
| Mass | 1.16+0.07 −0.05 M☉ |
| Radius | 1.87±0.04 R☉ |
| Luminosity | 4.55+0.26 −0.25 L☉ |
| Surface gravity (log g) | 3.97±0.07 cgs |
| Temperature | 6,155+60 −53 K |
| Metallicity [Fe/H] | −0.27±0.03 dex |
| Rotational velocity (v sin i) | 12.67 km/s |
| Age | 5.0±0.5 Gyr |
| Xi Peg B | |
| Mass | 0.32 M☉ |
| Temperature | 3,569 K |
| Metallicity [Fe/H] | −0.25 dex |
| Other designations | |
| 46 Peg, Gl 872, BD+11°4875, HD 215648, HIP 112447, HR 8665, SAO 108165. | |
| Database references | |
| SIMBAD | data |
Xi Pegasi (ξ Peg, ξ Pegasi) is the Bayer designation for a double star in the northern constellation of Pegasus, the winged horse. Located in the horse's neck, the primary component is an F-type main sequence star that is visible to the naked eye with an apparent visual magnitude of 4.2. It is 87% larger and 15% more massive that the Sun, radiating 4.55 times the solar luminosity. Based upon parallax measurements taken with the Hipparcos spacecraft, it is located 53.2 ± 0.2 light years from the Sun.
The primary has been examined for the presence of an infrared excess that might indicate the presence of a debris disk, but none has been discovered. The common proper motion companion, NLTT 54820, is a twelfth magnitude red dwarf located at an angular separation of 11.4″ along a position angle of 96.9°. This corresponds to a projected physical separation of 192.3 AU.