87 Pegasi

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87 Pegasi
Pegasus constellation map.svg
Red circle.svg
Location of 87 Pegasi (circled in red)
Observation data
Epoch J2000.0       Equinox J2000.0
Constellation Pegasus [1]
Right ascension 00h 09m 02.42s [2]
Declination +18° 12′ 43.1″ [2]
Apparent magnitude  (V)5.53 [3]
Characteristics
Evolutionary stage horizontal branch [4]
Spectral type G9III [5]
B−V color index +1.04 [1]
Astrometry
Radial velocity (Rv)−19.85±0.13 [2] km/s
Proper motion (μ)RA: +140.876 [2] mas/yr
Dec.: −25.250 [2] mas/yr
Parallax (π)10.8284±0.0698  mas [2]
Distance 301 ± 2  ly
(92.3 ± 0.6  pc)
Absolute magnitude  (MV)+0.86 [1]
Details
Mass 1.81 [6]   M☉
Radius 9.8 [7]   R☉
Luminosity 56 [7]   L☉
Surface gravity (log g)2.70 [7]   cgs
Temperature 4,811 [6]   K
Metallicity [Fe/H]+0.04 [6]   dex
Age 1.77 [6]   Gyr
Other designations
87 Pegasi, AG+17 13, BD+17 7, Gaia DR3 2797074778388646016, HD 448, HIP 729, HR 22, SAO 91734, PPM 116172, TIC 258877786, TYC 1181-1782-1, GCRV 68, GSC 01181-01782, IRAS 00064+1756, 2MASS J00090243+1812432 [8]
Database references
SIMBAD data

87 Pegasi (also known as HD 448) is a red giant star located in the northern constellation of Pegasus. With an apparent visual magnitude of 5.56, it is faintly visible to the naked eye under dark skies but requires good conditions or binoculars for reliable observation. [3]

Observation

The star was observed in ultraviolet by NASA's GALEX satellite to find correlation between chromosphere and coronal activity with many other red giant stars. [9]

Reference

  1. 1 2 3 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters . 38 (5): 331. arXiv: 1108.4971 . Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.
  2. 1 2 3 4 5 6 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211 . Bibcode:2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940 . S2CID   244398875. Gaia DR3 record for this source at VizieR.
  3. 1 2 "87 Pegasi - Star in Pegasus | TheSkyLive". theskylive.com. Retrieved 2025-12-14.
  4. ↑ Tautvaišienė, G.; Barisevičius, G.; Chorniy, Y.; Ilyin, I.; Puzeras, E. (2013). "Red clump stars of the Milky Way - laboratories of extra-mixing". Monthly Notices of the Royal Astronomical Society. 430 (1): 621. arXiv: 1304.4393 . Bibcode:2013MNRAS.430..621T. doi: 10.1093/mnras/sts663 .
  5. ↑ Cenarro, A. J.; Peletier, R. F.; Sánchez-Blázquez, P.; Selam, S. O.; Toloba, E.; Cardiel, N.; Falcón-Barroso, J.; Gorgas, J.; Jiménez-Vicente, J.; Vazdekis, A. (2007). "Medium-resolution Isaac Newton Telescope library of empirical spectra - II. The stellar atmospheric parameters". Monthly Notices of the Royal Astronomical Society. 374 (2): 664. arXiv: astro-ph/0611618 . Bibcode:2007MNRAS.374..664C. doi: 10.1111/j.1365-2966.2006.11196.x .
  6. 1 2 3 4 Maldonado, J.; Mirouh, G. M.; Mendigutía, I.; Montesinos, B.; Gragera-Más, J. L.; Villaver, E. (2025). "Intermediate-mass stars and the origin of the gas-giant planet-metallicity correlation". Astronomy and Astrophysics. 695: A27. arXiv: 2501.19074 . Bibcode:2025A&A...695A..27M. doi:10.1051/0004-6361/202453328.
  7. 1 2 3 Maldonado, J.; Villaver, E.; Eiroa, C. (2013). "The metallicity signature of evolved stars with planets". Astronomy and Astrophysics. 554: A84. arXiv: 1303.3418 . Bibcode:2013A&A...554A..84M. doi:10.1051/0004-6361/201321082.
  8. ↑ "87 Pegasi". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2025-12-14.
  9. ↑ Crandall, Sara; Smith, Graeme H. (2023-02-01). "Correlations in Chromospheric and Coronal Activity Indicators of Giant Stars". The Astronomical Journal. 165 (2): 70. Bibcode:2023AJ....165...70C. doi: 10.3847/1538-3881/aca150 . ISSN   0004-6256.
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