Xi Pegasi

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 87% larger and 15% more massive that the Sun, radiating 4.55 times the solar luminosity.^[8] Based upon parallax measurements taken with the Hipparcos spacecraft, it is located 53.2 ± 0.2 light years from the Sun.^[1]

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 mas[1]
Distance	53.2 ± 0.2 ly (16.30 ± 0.05 pc)
Absolute magnitude (MV)	3.25[7]
Details
Xi Peg A
Mass	1.16+0.07 −0.05[8] M☉
Radius	1.87±0.04[8] R☉
Luminosity	4.55+0.26 −0.25[8] L☉
Surface gravity (log g)	3.97±0.07[9] cgs
Temperature	6,155+60 −53[8] K
Metallicity [Fe/H]	−0.27±0.03[9] dex
Rotational velocity (v sin i)	12.67[10] km/s
Age	5.0±0.5[9] Gyr
Xi Peg B
Mass	0.32[11] M☉
Temperature	3,569[3] K
Metallicity [Fe/H]	−0.25[3] dex
Other designations
46 Peg, Gl 872, BD+11°4875, HD 215648, HIP 112447, HR 8665, SAO 108165.[12]
Database references
SIMBAD	data

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.^[13] 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°.^[14] This corresponds to a projected physical separation of 192.3 AU.^[13]