Astronomy:HD 66141

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Short description: Star in the constellation Canis Minor
HD 66141
Location of HD 66141 (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Canis Minor[1]
Right ascension  08h 02m 15.93692s[2]
Declination +02° 20′ 04.4588″[2]
Apparent magnitude (V) +4.39[1]
Characteristics
Spectral type K2IIIbFe-0.5:[3]
B−V color index 1.252±0.008[1]
Astrometry
Radial velocity (Rv)+71.57±0.01[1] km/s
Proper motion (μ) RA: −28.194[2] mas/yr
Dec.: 105.65[2] mas/yr
Parallax (π)12.5234 ± 0.1142[2] mas
Distance260 ± 2 ly
(79.9 ± 0.7 pc)
Absolute magnitude (MV)−0.07[1]
Details[4]
Mass0.98±0.06 M☉
Radius23.57±0.40[5] R☉
Luminosity209±9[5] L☉
Habitable zone inner limit13.45±0.41[5] AU
Habitable zone outer limit26.38±0.77[5] AU
Surface gravity (log g)2.09±0.06 cgs
Temperature4,521±53[5] K
Metallicity [Fe/H]−0.52±0.05 dex
Rotational velocity (v sin i)1.91±0.45 km/s
Age9.18±2.09 Gyr
Other designations
G Canis Minoris, G CMi, 13 Puppis (obsolete), NSV 17713, BD+02°1854, FK5 2623, GC 10891, HD 66141, HIP 39311, HR 3145, SAO 116260, CCDM 08022+0221, WDS J08023+0220A[6][7]
Database references
SIMBADdata
Exoplanet Archive66141 data
Extrasolar Planets
Encyclopaedia		data

HD 66141 is a single[8] star with a substellar companion in the equatorial constellation of Canis Minor. It has the Bayer designation G Canis Minoris,[6] the Gould designation 50 G. Canis Minoris,[7] and has the HR 3145 identifier from the Bright Star Catalogue.[6] When first catalogued it was in the Puppis constellation and was designated "13 Puppis", but it subsequently migrated to Canis Minor.[9] Bode gave it the Bayer designation of Lambda Canis Minoris.[10]

Properties

This star has an orange hue and is bright enough to be faintly visible to the naked eye on a dark night, having an apparent visual magnitude of +4.39.[1] It is located at a distance of approximately 260 light years from the Sun based on parallax,[2] and is drifting further away with a radial velocity of +71.6 km/s.[1] The star is considered a member of the thin disk population.[4] It has one known substellar companion, previously believed to be a planet,[11] but now thought to be a likely brown dwarf, with some caveats.[12]

The stellar classification of HD 66141 is K2IIIbFe-0.5:,[3] which indicates an evolved K-type giant star with a mild underabundance of iron. It is an estimated nine billion years old with 0.98 times the mass of the Sun[4] and has expanded to 23.5 times the Sun's radius.[5] Over 2003 to 2012 a starspot was periodically dimming its light.[11] The star is radiating 209 times the luminosity of the Sun from its photosphere at an effective temperature of 4,521 K.[5]

A magnitude 10.32 visual companion was reported by J. Glaisher in 1842. As of 2015, it was located at an angular separation of 224.90 arcseconds along a position angle of 315°.[13]

Planetary system

From December 2003 to January 2012, the team B.-C. Lee, I. Han, and M.-G. Park observed HD 66141 with "the fiber-fed Bohyunsan Observatory Echelle Spectrograph (BOES) at Bohyunsan Optical Astronomy Observatory (BOAO)".[11]

In 2012, a long-period, wide-orbiting exoplanet was deduced by radial velocity. This was published in November.

However, in 2024, a study using astrometry from the Gaia spacecraft suggest that HD 66141 b is actually a brown dwarf, with a maximum mass estimated at 23.9+7.2
−6.4 MJ, based on a large RUWE in the astrometric solution (which could imply that there is a brown dwarf orbiting HD 66141), but they also note that mechanisms such as calibration errors could also explain the large RUWE. A bayesian analysis combining astrometry and radial velocity also measure an orbital inclination of 17 degrees and an orbital period of 480.7 days (1.316 years).[12]

The HD 66141 planetary system
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b ≤23.9+7.2
−6.4[12] MJ 		1.2 ± 0.1[11] 480.7±0.1[11] 0.07 ± 0.03[11] 17+3
−4[12]° 		—

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A  XHIP record for this object at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  3. ↑ 3.0 3.1 Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars". The Astrophysical Journal Supplement Series 71: 245. doi:10.1086/191373. Bibcode: 1989ApJS...71..245K. 
  4. ↑ 4.0 4.1 4.2 Jofré, E. et al. (2015). "Stellar parameters and chemical abundances of 223 evolved stars with and without planets". Astronomy & Astrophysics 574: A50. doi:10.1051/0004-6361/201424474. Bibcode: 2015A&A...574A..50J. 
  5. ↑ 5.0 5.1 5.2 5.3 5.4 5.5 5.6 Baines, Ellyn K. et al. (January 2025). "Eighteen Exoplanet Host Stars from the NPOI Data Archive" (in en). The Astronomical Journal 169 (2): 83. doi:10.3847/1538-3881/ad9bb1. ISSN 1538-3881. Bibcode: 2025AJ....169...83B. 
  6. ↑ 6.0 6.1 6.2 "G CMi". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=G+CMi. 
  7. ↑ 7.0 7.1 Gould, Benjamin Apthorp (1879). "Uranometria Argentina catalog of bright southern stars". Resultados del Observatorio Nacional Argentino en Cordoba (Buenos Aires) 1. Bibcode: 1879RNAO....1.....G. http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=V%2F135%2Fcatalog. Retrieved 2021-01-27. 
  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. doi:10.1111/j.1365-2966.2008.13596.x. Bibcode: 2008MNRAS.389..869E. 
  9. ↑ Griffin, R. F. (1999). "Spectroscopic binary orbits from photoelectric radial velocities. Paper 148: HR 7955". The Observatory 119: 272–283. Bibcode: 1999Obs...119..272G. 
  10. ↑ Wagman, Morton (2003). Lost Stars: Lost, Missing and Troublesome Stars from the Catalogues of Johannes Bayer, Nicholas Louis de Lacaille, John Flamsteed, and Sundry Others. Blacksburg, VA: The McDonald & Woodward Publishing Company. p. 460. ISBN 978-0-939923-78-6. Bibcode: 2003lslm.book.....W. 
  11. ↑ 11.0 11.1 11.2 11.3 11.4 11.5 Lee, B.-C. et al. (2012). "Detection of an exoplanet around the evolved K giant HD 66141". Astronomy & Astrophysics 548: A118. doi:10.1051/0004-6361/201118014. Bibcode: 2012A&A...548A.118L. 
  12. ↑ 12.0 12.1 12.2 12.3 Wallace, A. L. et al. (November 18, 2024). "Detection and Characterisation of Giant Planets with Gaia Astrometry". Monthly Notices of the Royal Astronomical Society 536 (3): 2485. doi:10.1093/mnras/stae2769. Bibcode: 2025MNRAS.536.2485W. 
  13. ↑ Mason, B. D. et al. (2014). "The Washington Visual Double Star Catalog". The Astronomical Journal 122 (6): 3466–3471. doi:10.1086/323920. Bibcode: 2001AJ....122.3466M. 



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