Xi Pegasi
| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Pegasus |
| Right ascension | 22h 46m 41.58118s[1] |
| Declination | +12° 10′ 22.3854″[1] |
| Apparent magnitude (V) | 4.195[2] + 11.70[3] |
| Characteristics | |
| Spectral type | F6V[4] + M3.5[5] |
| U−B color index | −0.015[2] |
| B−V color index | +0.502[2] |
| Astrometry | |
| Radial velocity (Rv) | −5.3[6] km/s |
| Proper motion (μ) | RA: +234.18[1] mas/yr Dec.: −493.29[1] mas/yr |
| Parallax (π) | 61.36 ± 0.19[1] mas |
| Distance | 53.2 ± 0.2 ly (16.30 ± 0.05 pc) |
| Details | |
| Xi Peg A | |
| Mass | 1.17[7] M☉ |
| Radius | 1.86[7] R☉ |
| Luminosity | 4.5[7] L☉ |
| Surface gravity (log g) | 3.97 ± 0.07[7] cgs |
| Temperature | 6,178 ± 26[7] K |
| Metallicity [Fe/H] | −0.27 ± 0.03[7] dex |
| Rotational velocity (v sin i) | 12.67[8] km/s |
| Age | 5.0±0.5[7] Gyr |
| Xi Peg B | |
| Mass | 0.32[9] M☉ |
| Temperature | 3,569[3] K |
| Metallicity [Fe/H] | −0.25[3] dex |
| Other designations | |
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.[2] It is 86% larger and 17% more massive that the Sun, radiating 4.5 times the solar luminosity.[7] Based upon parallax measurements taken with the Hipparcos spacecraft, it is located 53.2 ± 0.2 light years from the Sun.[1]
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.[11] 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°.[12] This corresponds to a projected physical separation of 192.3 AU.[11]
References
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