Xi Pegasi

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]
Distance53.2 ± 0.2 ly
(16.30 ± 0.05 pc)
Absolute magnitude (MV)3.25[7]
Details
Xi Peg A
Mass1.17[8] M☉
Radius1.86[8] R☉
Luminosity4.5[8] L☉
Surface gravity (log g)3.97±0.07[8] cgs
Temperature6,178±26[8] K
Metallicity [Fe/H]−0.27±0.03[8] dex
Rotational velocity (v sin i)12.67[9] km/s
Age5.0±0.5[8] Gyr
Xi Peg B
Mass0.32[10] M☉
Temperature3,569[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.[11]
Database references
SIMBADdata

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.[8] 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.[12] 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°.[13] This corresponds to a projected physical separation of 192.3 AU.[12]

  1. ^ a b c d e f Cite error: The named reference van Leeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference aass61_387 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference apj748_2_934 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference aj121_4_2159 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference apjss59_197 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference gcsrv was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference huang2012 was invoked but never defined (see the help page).
  8. ^ a b c d e f g h Cite error: The named reference apj720_2_1290 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference MartínezArnáiz2010 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference aj147_4_87 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  12. ^ a b Cite error: The named reference apj801_2_143 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference apjss150_2_455 was invoked but never defined (see the help page).