HD 161988

HD 161988 is a solitary star in the southern circumpolar constellation Apus. It has an apparent magnitude of 6.07, allowing it to be faintly visible to the naked eye. Located 621 light years away, it is receding with a heliocentric radial velocity of 36.8 km/s.

HD 161988
Observation data
Epoch J2000      Equinox J2000
Constellation Apus
Right ascension 17h 57m 41.686s[1]
Declination −76° 10′ 40.62″[1]
Apparent magnitude (V) 6.07[2]
Characteristics
Spectral type K2III[3]
U−B color index +1.28[2]
B−V color index +1.20[2]
Astrometry
Radial velocity (Rv)+36.8[4] km/s
Proper motion (μ) RA: 2.464[1] mas/yr
Dec.: −1.867[1] mas/yr
Parallax (π)5.2546 ± 0.0220 mas[1]
Distance621 ± 3 ly
(190.3 ± 0.8 pc)
Absolute magnitude (MV)−0.26[5]
Details
Mass1.2[6] M☉
Radius21[7] R☉
Luminosity185[8] L☉
Surface gravity (log g)1.78[6] cgs
Temperature4,310[6] K
Metallicity [Fe/H]−0.13[6] dex
Rotational velocity (v sin i)2.1[9] km/s
Other designations
CD−76°919, HD 161988, HIP 87926, HR 6635, SAO 257542
Database references
SIMBADdata

The object is an early K-type giant with 120% the mass of the Sun and an enlarged radius of 21 R☉. It shines at 185 times the luminosity of the Sun from its photosphere at an effective temperature of 4,310 K, which gives it an orange glow. HD 161988 has an iron abundance 74% that of the Sun and spins modestly with a projected rotational velocity of 2.1 km/s.

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. Gaia EDR3 record for this source at VizieR.
  2. Johnson, H. L.; et al. (1966). "UBVRIJKL photometry of the bright stars". Communications of the Lunar and Planetary Laboratory. 4 (99). Bibcode:1966CoLPL...4...99J.
  3. Houk, Nancy; Cowley, A. P. (1979). Michigan catalogue of two-dimensional spectral types for the HD stars. Vol. 1. Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan. Bibcode:1978mcts.book.....H.
  4. Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
  5. 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. S2CID 119257644.
  6. Anders, F.; Khalatyan, A.; Chiappini, C.; Queiroz, A. B.; Santiago, B. X.; Jordi, C.; Girardi, L.; Brown, A. G. A.; Matijevič, G.; Monari, G.; Cantat-Gaudin, T.; Weiler, M.; Khan, S.; Miglio, A.; Carrillo, I.; Romero-Gómez, M.; Minchev, I.; de Jong, R. S.; Antoja, T.; Ramos, P.; Steinmetz, M.; Enke, H. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy & Astrophysics. 628: A94. arXiv:1904.11302. Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765. ISSN 0004-6361.
  7. Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467. ISSN 0004-6256.
  8. McDonald, I.; et al. (2012). "Fundamental Parameters and Infrared Excesses of Hipparcos Stars". Monthly Notices of the Royal Astronomical Society. 427 (1): 343–57. arXiv:1208.2037. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x. S2CID 118665352.
  9. De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (January 2014). "A catalog of rotational and radial velocities for evolved stars: V. Southern stars⋆⋆⋆". Astronomy & Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. ISSN 0004-6361.
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