Astronomy:HD 141937

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Short description: Star in the constellation Libra
HD 141937
Observation data
Equinox J2000.0]] (ICRS)
Constellation Libra
Right ascension  15h 52m 17.54814s[1]
Declination −18° 26′ 09.7939″[1]
Apparent magnitude (V) 7.25[2]
Characteristics
Spectral type G1V[3]
B−V color index +0.628±0.002[2]
Astrometry
Radial velocity (Rv)−2.20±0.68[2] km/s
Proper motion (μ) RA: +97.231±0.133[1] mas/yr
Dec.: +19.113±0.116[1] mas/yr
Parallax (π)29.9453 ± 0.0640[1] mas
Distance108.9 ± 0.2 ly
(33.39 ± 0.07 pc)
Absolute magnitude (MV)4.71[2]
Details
Mass1.03[4] M
Radius1.05[1] R
Luminosity1.202±0.003[1] L
Surface gravity (log g)4.44[4] cgs
Temperature5,890+15
−30
[1] K
Metallicity [Fe/H]+0.10±0.01[2] dex
Rotational velocity (v sin i)6.0[2] km/s
Age3.82[4] Gyr
Other designations
BD−17° 4442, HD 141937, HIP 77740, SAO 159551[5]
Database references
SIMBADdata
Extrasolar Planets
Encyclopaedia
data

HD 141937 is a star in the southern zodiac constellation of Libra, positioned a couple of degrees to the north of Lambda Librae. It is a yellow-hued star with an apparent visual magnitude of 7.25,[2] which means it is too faint to be seen with the naked eye. This object is located at a distance of 108.9 light years from the Sun based on parallax,[1] but is drifting closer with a radial velocity of −2.2 km/s.[2] It has an absolute magnitude of 4.71.[2]

This is a G-type main-sequence star with a stellar classification of G1V.[3] It is a solar-type star with slightly higher mass and radius compared to the Sun. The metallicity is higher than solar. It is an estimated 3.8[4] billion years old and is spinning with a projected rotational velocity of 6 km/s.[6] The star is radiating 1.2 times the luminosity of the Sun from its photosphere at an effective temperature of 5,890 K.[1]

The star has a substellar companion (HD 141937 b) announced in April 2001 by the European Southern Observatory. It has a minimum mass of 9.7 ||J}}}}}}. In 2020, the inclination of the orbit was measured, revealing its true mass to be 27.4 ||J}}}}}}, which makes it a brown dwarf. A 653-day orbit places the orbital distance 1.5 times farther away from the star as Earth is from the Sun, with a high eccentricity of 41%.[7][8]

The HD 141937 planetary system[9][10][8]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b 27.42+6.78
−9.86
 MJ
1.4877±0.0018 653.22±1.21 0.41±0.01 20.52+12.47
−4.16
°

See also

References

  1. 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  2. 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode2012AstL...38..331A. 
  3. 3.0 3.1 Gray, R. O. et al. (July 2006). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 parsecs: The Northern Sample I". The Astronomical Journal 132 (1): 161–170. doi:10.1086/504637. Bibcode2006AJ....132..161G. 
  4. 4.0 4.1 4.2 4.3 Luck, R. Earle (January 2017). "Abundances in the Local Region II: F, G, and K Dwarfs and Subgiants". The Astronomical Journal 153 (1): 19. doi:10.3847/1538-3881/153/1/21. 21. Bibcode2017AJ....153...21L. 
  5. "HD 117207". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+117207. 
  6. Delgado Mena, E. et al. (February 2014). "Li depletion in solar analogues with exoplanets. Extending the sample". Astronomy & Astrophysics 562: 17. doi:10.1051/0004-6361/201321493. A92. Bibcode2014A&A...562A..92D. 
  7. "Exoplanets: The Hunt Continues!" (Press release). Garching, Germany: European Southern Observatory. April 4, 2001. Retrieved December 29, 2012.
  8. 8.0 8.1 Kiefer, F. et al. (January 2021). "Determining the true mass of radial-velocity exoplanets with Gaia. Nine planet candidates in the brown dwarf or stellar regime and 27 confirmed planets". Astronomy & Astrophysics 645. doi:10.1051/0004-6361/202039168. Bibcode2021A&A...645A...7K. 
  9. Udry, S. et al. (2002). "The CORALIE survey for southern extra-solar planets VIII. The very low-mass companions of HD141937, HD162020, HD168443, HD202206: brown dwarfs or superplanets?". Astronomy and Astrophysics 390 (1): 267–279. doi:10.1051/0004-6361:20020685. Bibcode2002A&A...390..267U. http://www.aanda.org/articles/aa/full/2002/28/aa2416/aa2416.html. 
  10. Liu, Kang et al. (November 2014). "Precise determination of fundamental parameters of six exoplanet host stars and their planets". Research in Astronomy and Astrophysics 14 (11): 1447–1457. doi:10.1088/1674-4527/14/11/008. 1447-1457. Bibcode2014RAA....14.1447L. 

Coordinates: Sky map 15h 52m 17.5474s, −18° 26′ 09.834″