HD 122862

HD 122862
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Apus
Right ascension 14h 08m 27.1634s[1]
Declination −74° 51′ 01.0329″[1]
Apparent magnitude (V) 6.02[2]
Characteristics
Spectral type G2/3 IV[3]
U−B color index +0.06[4]
B−V color index +0.58[4]
Astrometry
Radial velocity (Rv)−21.11±0.16[5] km/s
Proper motion (μ) RA: −243.574[1] mas/yr
Dec.: +179.540[1] mas/yr
Parallax (π)34.1491 ± 0.0256 mas[1]
Distance95.51 ± 0.07 ly
(29.28 ± 0.02 pc)
Absolute magnitude (MV)+3.75[2]
Details[6]
Mass1.08+0.02
−0.01 M☉
Radius1.58+0.03
−0.05[5] R☉
Luminosity2.87±0.01[5] L☉
Surface gravity (log g)4.10±0.03 cgs
Temperature5,943±50 K
Metallicity [Fe/H]−0.15±0.04 dex
Rotational velocity (v sin i)3.1±1[7] km/s
Age6.83+0.39
−0.57 Gyr
Other designations
5 G. Apodis, CD−74°865, CPD−74°1142, GC 19036, GJ 539.1, HD 122862, HIP 69090, HR 5279, SAO 257116
Database references
SIMBADdata

HD 122862 (HR 5279) is a solitary star in the southern circumpolar constellation Apus. It has an apparent magnitude of 6.02,[2] allowing it to be faintly seen with the naked eye under ideal conditions. The star is relatively close at a distance of 95 light years,[1] but is approaching the Sun with a radial velocity of −21.11 km/s.[5]

HD 122862 is a G-type subgiant[3] with 1.08 times the mass of the Sun[6] and a diameter of 1.58 R☉.[5] It shines at 2.87 times the luminosity of the Sun[5] from its photosphere at an effective temperature of 5,943 K,[6] giving it a yellow glow. HD 122862 has an iron abundance 71% that of the Sun[6] and, at an age of 6.83 billion years,[6] it spins slowly with a projected rotational velocity of 3.1 km/s.[7]

References

  1. ^ a b c d e f 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. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  2. ^ a b c Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. ISSN 1063-7737. S2CID 119257644.
  3. ^ a b Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations -90_ to -53_ƒ0. Bibcode:1975mcts.book.....H.
  4. ^ a b Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1 January 1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J.
  5. ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  6. ^ a b c d e Aguilera-Gómez, Claudia; Ramírez, Iván; Chanamé, Julio (June 2018). "Lithium abundance patterns of late-F stars: an in-depth analysis of the lithium desert". Astronomy and Astrophysics. 614: A55. arXiv:1803.05922. Bibcode:2018A&A...614A..55A. doi:10.1051/0004-6361/201732209. ISSN 0004-6361.
  7. ^ a b 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.