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HD 72922 is a solitary[8] star in the circumpolar constellation Chamaeleon. It has an apparent magnitude of 5.67,[2] allowing it to be viewed with the naked eye under ideal conditions. Located 274 light years away,[1] it is receding with a heliocentric radial velocity of 27.5 km/s.[5]

HD 72922
Observation data
Epoch J2000      Equinox J2000
Constellation Chamaeleon
Right ascension 08h 24m 19.8867s[1]
Declination −80° 54′ 51.2175″[1]
Apparent magnitude (V) 5.67[2]
Characteristics
Spectral type G8 III[3]
U−B color index +0.74[4]
B−V color index +1.02[4]
Astrometry
Radial velocity (Rv)27.5±0.6[5] km/s
Proper motion (μ) RA: −149.123[1] mas/yr
Dec.: +226.547[1] mas/yr
Parallax (π)11.8882 ± 0.111 mas[1]
Distance274 ± 3 ly
(84.1 ± 0.8 pc)
Absolute magnitude (MV)+1.27[2]
Details[6]
Mass0.96±0.04 M☉
Radius9.65±0.17 R☉
Luminosity41.2±0.9 L☉
Surface gravity (log g)2.56±0.12 cgs
Temperature4,708±34 K
Metallicity [Fe/H]−0.43±0.03 dex
Rotational velocity (v sin i)<1[7] km/s
Other designations
6 G. Chamaeleontis, CD−80°290, CPD−80°258, GC 11625, HD 72922, HIP 41191, HR 3393, SAO 258496
Database references
SIMBADdata

This object is a yellow giant with 96% the mass of the Sun and an enlarged diameter of 9.65 solar radii.[6] It radiates at 41.2 times the luminosity of the Sun from its photosphere at an effective temperature of 4,708 K, giving a yellow orange glow.[6] HD 72922 is metal deficient due to a metallicity only 37% that of the Sun[6] and spins too slowly to be measured.[7]


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. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  2. 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. 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. Hoffleit, Dorrit; Jaschek, Carlos (1991). "The Bright star catalogue". New Haven, Conn.: Yale University Observatory, 5th Rev.ed. Bibcode:1991bsc..book.....H.
  5. Gontcharov, G. A. (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. Retrieved 12 December 2016.
  6. Ottoni, G.; Udry, S.; Ségransan, D.; Buldgen, G.; Lovis, C.; Eggenberger, P.; Pezzotti, C.; Adibekyan, V.; Marmier, M.; Mayor, M.; Santos, N. C.; Sousa, S. G.; Lagarde, N.; Charbonnel, C. (January 2022). "CORALIE radial-velocity search for companions around evolved stars (CASCADES): I. Sample definition and first results: Three new planets orbiting giant stars,". Astronomy & Astrophysics. 657: A87. arXiv:2201.01528. Bibcode:2022A&A...657A..87O. doi:10.1051/0004-6361/202040078. ISSN 0004-6361.
  7. 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.
  8. Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976


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