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HD 204941

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HD 204941
Observation data
Epoch J2000      Equinox J2000
Constellation Capricornus
Right ascension  21h 32m 23.5100s[1]
Declination −20° 57′ 26.7196″[1]
Apparent magnitude (V) 8.48
Spectral type K2V+M0V
Radial velocity (Rv)32.569 km/s
Proper motion (μ) RA: -279.074 mas/yr
Dec.: -124.241 mas/yr
Parallax (π)34.7945 ± 0.0735[2] mas
Distance93.7 ± 0.2 ly
(28.74 ± 0.06 pc)
PrimaryHD 204941
CompanionLP 873-74
Semi-major axis (a)1610±12 AU[3]
HD 204941
Mass0.77±0.02 M
Radius0.71±0.01 R
Luminosity0.297±0.003 L
Surface gravity (log g)4.62±0.02 cgs
Temperature5072±17 K
Rotation43.6±4.88 d
Age3.9±3.3 Gyr
LP 873-74
Other designations
BD−21 6035, HD 204941, HIP 106353, TYC 6373-214-1, 2MASS J21322353-2057264[1]
Database references

HD 204941 is a binary star about 94 light-years away. The primary main-sequence star belongs to the spectral class of K2. Its age is poorly constrained, but is likely to be younger than Sun's. The primary star is slightly depleted of heavy elements, having 65% of solar abundance.[5]

The imaging search for close-in stellar companions have failed to uncover any in 2011.[6] Nonetheless, the stellar companion LP 873-74 was found in 2012 by analysis of stellar proper motions.[7] The projected separation of stars was 53.62″, or over 1500 AU.

Planetary system[edit]

In 2010 one Saturn-sized HD 204941 b on an eccentric orbit was discovered utilising the radial velocity method.[5] Presence of additional gas giants in the system was ruled out in 2013.[8]

The HD 204941 planetary system[5]
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
HD 204941 b [ru] >0.266±0.032 MJ 2.56±0.08 1733.0±74 0.37±0.08


  1. 1.0 1.1 1.2 "HD 204941". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 1 October 2020.
  2. 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.
  3. Montes, D.; González-Peinado, R.; Tabernero, H. M.; Caballero, J. A.; Marfil, E.; Alonso-Floriano, F. J.; Cortés-Contreras, M.; González Hernández, J. I.; Klutsch, A.; Moreno-Jódar, C. (2018), "Calibrating the metallicity of M dwarfs in wide physical binaries with F-, G-, and K-primaries - I: High-resolution spectroscopy with HERMES: stellar parameters, abundances, and kinematics", Monthly Notices of the Royal Astronomical Society, 479 (1): 1332, arXiv:1805.05394, Bibcode:2018MNRAS.479.1332M, doi:10.1093/mnras/sty1295 Unknown parameter |s2cid= ignored (help)
  4. Bonfanti, A.; Ortolani, S.; Nascimbeni, V. (2016), "Age consistency between exoplanet hosts and field stars", Astronomy & Astrophysics, 585: A5, arXiv:1511.01744, Bibcode:2016A&A...585A...5B, doi:10.1051/0004-6361/201527297 Unknown parameter |s2cid= ignored (help)
  5. 5.0 5.1 5.2 5.3 Dumusque, X.; Lovis, C.; Ségransan, D.; Mayor, M.; Udry, S.; Benz, W.; Bouchy, F.; Lo Curto, G.; Mordasini, C.; Pepe, F.; Queloz, D.; Santos, N. C.; Naef, D. (2011), "The HARPS search for southern extra-solar planets. XXX. Planetary systems around stars with solar-like magnetic cycles and short-term activity variation", Astronomy & Astrophysics, 535: A55, arXiv:1107.1748, Bibcode:2011A&A...535A..55D, doi:10.1051/0004-6361/201117148 Unknown parameter |s2cid= ignored (help)
  6. Mason, Brian D.; Hartkopf, William I.; Raghavan, Deepak; Subasavage, John P.; Roberts, Lewis C.; Turner, Nils H.; Ten Brummelaar, Theo A. (2011), "Know the Star, Know the Planet. II. Speckle Interferometry of Exoplanet Host Stars", The Astronomical Journal, 142 (5): 176, arXiv:1109.4569, Bibcode:2011AJ....142..176M, doi:10.1088/0004-6256/142/5/176 Unknown parameter |s2cid= ignored (help)
  7. Roell, T.; Neuhäuser, R.; Seifahrt, A.; Mugrauer, M. (2012), "Extrasolar planets in stellar multiple systems", Astronomy & Astrophysics, 542: A92, arXiv:1204.4833, Bibcode:2012A&A...542A..92R, doi:10.1051/0004-6361/201118051 Unknown parameter |s2cid= ignored (help)
  8. Wittenmyer, Robert A.; Wang, Songhu; Horner, Jonathan; Tinney, C. G.; Butler, R. P.; Jones, H. R. A.; O'Toole, S. J.; Bailey, J.; Carter, B. D.; Salter, G. S.; Wright, D.; Zhou, Ji-Lin (2013), "Forever alone? Testing single eccentric planetary systems for multiple companions", The Astrophysical Journal Supplement Series, 208 (1): 2, arXiv:1307.0894, Bibcode:2013ApJS..208....2W, doi:10.1088/0067-0049/208/1/2 Unknown parameter |s2cid= ignored (help)

Coordinates: Sky map 21h 32m 23.5100s, −20° 57′ 26.7196″

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