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Xi Pegasi

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Xi Pegasi
Location of ξ Pegasi (circled in red)
Observation data
Epoch J2000.0      Equinox ICRS
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
Mass1.16+0.07
−0.05[8] M☉
Radius1.87±0.04[8] R☉
Luminosity4.55+0.26
−0.25[8] L☉
Surface gravity (log g)3.97±0.07[9] cgs
Temperature6,155+60
−53[8] K
Metallicity [Fe/H]−0.27±0.03[9] dex
Rotational velocity (v sin i)12.67[10] km/s
Age5.0±0.5[9] Gyr
Xi Peg B
Mass0.32[11] M☉
Temperature3,569[3] K
Metallicity [Fe/H]−0.25[3] dex
Other designations
Tugongli, ξ Peg, 46 Peg, BD+11°4875, GJ 872, HD 215648, HIP 112447, HR 8665, SAO 108165[12]
Database references
SIMBADA
B

Xi Pegasi (ξ Peg, ξ Pegasi), also named Tugongli,[13] is 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]

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.[14] 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°.[15] This corresponds to a projected physical separation of 192.3 AU.[14]

In Chinese astronomy, this star is part of the asterism Tǔ Gōng Lì (Clerks of the Earth Official, 土公吏). The IAU Working Group on Star Names adopted the name Tugongli for this star on 13 August 2026, after this Chinese constellation.[13]

References

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  1. 1 2 3 4 5 6 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
  2. 1 2 3 4 Kozok, J. R. (September 1985), "Photometric observations of emission B-stars in the southern Milky Way", Astronomy and Astrophysics Supplement Series, 61: 387–405, Bibcode:1985A&AS...61..387K.
  3. 1 2 3 Rojas-Ayala, Bárbara; et al. (April 2012), "Metallicity and Temperature Indicators in M Dwarf K-band Spectra: Testing New and Updated Calibrations with Observations of 133 Solar Neighborhood M Dwarfs", The Astrophysical Journal, 748 (2): 93, arXiv:1112.4567, Bibcode:2012ApJ...748...93R, doi:10.1088/0004-637X/748/2/93, S2CID 41902340.
  4. ↑ Gray, R. O.; Graham, P. W.; Hoyt, S. R. (April 2001), "The Physical Basis of Luminosity Classification in the Late A-, F-, and Early G-Type Stars. II. Basic Parameters of Program Stars and the Role of Microturbulence", The Astronomical Journal, 121 (4): 2159–2172, Bibcode:2001AJ....121.2159G, doi:10.1086/319957, S2CID 250878890.
  5. ↑ Bidelman, W. P. (October 1985), "G. P. Kuiper's spectral classifications of proper-motion stars", Astrophysical Journal Supplement Series, 59: 197–227, Bibcode:1985ApJS...59..197B, doi:10.1086/191069.
  6. ↑ Wilson, R. E. (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication, Carnegie Institute of Washington D.C., Bibcode:1953GCRV..C......0W.
  7. ↑ Huang, W.; et al. (2012), "A catalogue of Paschen-line profiles in standard stars", Astronomy & Astrophysics, 547: A62, arXiv:1210.7893, Bibcode:2012A&A...547A..62H, doi:10.1051/0004-6361/201219804, S2CID 119286159.
  8. 1 2 3 4 5 Harada, Caleb K.; et al. (June 2024), "Setting the Stage for the Search for Life with the Habitable Worlds Observatory: Properties of 164 Promising Planet-survey Targets", The Astrophysical Journal Supplement Series, 272 (2), id. 30, arXiv:2401.03047, Bibcode:2024ApJS..272...30H, doi:10.3847/1538-4365/ad3e81.
  9. 1 2 3 Ghezzi, L.; et al. (September 2010), "Stellar Parameters and Metallicities of Stars Hosting Jovian and Neptunian Mass Planets: A Possible Dependence of Planetary Mass on Metallicity", The Astrophysical Journal, 720 (2): 1290–1302, arXiv:1007.2681, Bibcode:2010ApJ...720.1290G, doi:10.1088/0004-637X/720/2/1290, S2CID 118565025.
  10. ↑ Martínez-Arnáiz, R.; et al. (September 2010), "Chromospheric activity and rotation of FGK stars in the solar vicinity. An estimation of the radial velocity jitter" (PDF), Astronomy and Astrophysics, 520: A79, arXiv:1002.4391, Bibcode:2010A&A...520A..79M, doi:10.1051/0004-6361/200913725, S2CID 43455849, archived from the original (PDF) on 2017-09-22, retrieved 2018-11-04.
  11. ↑ Tokovinin, Andrei (April 2014), "From Binaries to Multiples. II. Hierarchical Multiplicity of F and G Dwarfs", The Astronomical Journal, 147 (4): 14, arXiv:1401.6827, Bibcode:2014AJ....147...87T, doi:10.1088/0004-6256/147/4/87, S2CID 56066740, 87.
  12. ↑ "ksi Peg". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2015-12-10.
  13. 1 2 "IAU Catalog of Star Names". Retrieved 16 August 2026.
  14. 1 2 Moro-Martín, A.; et al. (March 2015), "Does the Presence of Planets Affect the Frequency and Properties of Extrasolar Kuiper Belts? Results from the Herschel Debris and Dunes Surveys", The Astrophysical Journal, 801 (2): 28, arXiv:1501.03813, Bibcode:2015ApJ...801..143M, doi:10.1088/0004-637X/801/2/143, S2CID 55170390, 143.
  15. ↑ Gould, Andrew; Chanamé, Julio (February 2004), "New Hipparcos-based Parallaxes for 424 Faint Stars", The Astrophysical Journal Supplement Series, 150 (2): 455–464, arXiv:astro-ph/0309001, Bibcode:2004ApJS..150..455G, doi:10.1086/381147, S2CID 8494577.
[edit]
  • Kaler, James B., "Xi Pegasi", Stars, University of Illinois, retrieved 2016-01-07.
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