Astronomy:HD 101930

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Short description: Star in the constellation Centaurus
HD 101930
Observation data
Equinox J2000.0]] (ICRS)
Constellation Centaurus
Right ascension  11h 43m 30.11338s[1]
Declination –58° 00′ 24.7787″[1]
Apparent magnitude (V) 8.21[2]
Characteristics
Spectral type K2 V+[3]
B−V color index +0.91[4]
Astrometry
Radial velocity (Rv)+18.36[5] km/s
Proper motion (μ) RA: +16.680[1] mas/yr
Dec.: +349.125[1] mas/yr
Parallax (π)33.3814 ± 0.0180[1] mas
Distance97.71 ± 0.05 ly
(29.96 ± 0.02 pc)
Absolute magnitude (MV)+5.88[2]
Details
Mass0.82[6] M☉
Radius0.87+0.05−0.04[7] R☉
Luminosity0.43±0.01[8] L☉
Surface gravity (log g)4.40±0.11[9] cgs
Temperature5,079±62[5] K
Metallicity [Fe/H]+0.1±0.03[10] dex
Rotational velocity (v sin i)2[11] km/s
Age5.4±4.4[8] Gyr
Other designations
CD-57°4096, GJ 3683, HIP 57172, LTT 4350, NLTT 28356, SAO 239322[12]
Database references
SIMBADdata
ARICNSdata
Extrasolar Planets
Encyclopaedia		data

HD 101930, also known as Gliese 3683, is an orange hued star with an orbiting exoplanet located in the southern constellation Centaurus. It has an apparent magnitude of 8.21,[2] making it faintly visible in binoculars but not to the naked eye. The system is located relatively close at a distance of 98 light years[1] but is receding with a heliocentric radial velocity of 18.4 km/s.[5] It has a relatively large proper motion, traversing the celestial sphere with an angular velocity of 0.320″·yr−1.[13]

HD 101930 has a stellar classification of K2 V+,[3] indicating that it is an ordinary K-type main-sequence star. It has a current mass of 0.82 M☉[6] and is said to be 5.4 billion years old,[8] which is slightly older than the Sun. The object has 87% the radius of the Sun[7] and an effective temperature of 5,079 K.[5] When combined, these parameters yield a luminosity 43% that of the Sun from its photosphere.[8] As expected with planetary hosts, HD 101930 is metal enriched, having a metallicity 26% above solar levels.[10] The star's projected rotational velocity is similar to the Sun's, having a value of 2 km/s.[11]

A 2007 multicity survey found a co-moving companion located 73″ away,[14] making it a binary star. It has a class of M0-1[15] and a mass of 0.7 M☉.[14]

Planetary system

In 2005, the discovery of an exoplanet orbiting the star was announced. This is another discovery using the radial velocity method with the HARPS spectrograph. As the inclination of the orbital plane is unknown, only a lower bound on the mass can be determined. It has at least 30% of the mass of Jupiter.[5]

The HD 101930 planetary system[5]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b ≥ 0.30 MJ 0.302 70.46 ± 0.18 0.11 ± 0.02 — —

See also

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 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.
  2. ↑ 2.0 2.1 2.2 Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A. 
  3. ↑ 3.0 3.1 Gray, R. O.; Corbally, C. J.; Garrison, R. F.; McFadden, M. T.; Bubar, E. J.; McGahee, C. E.; O'Donoghue, A. A.; Knox, E. R. (2 June 2006). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc--The Southern Sample". The Astronomical Journal 132 (1): 161–170. doi:10.1086/504637. ISSN 0004-6256. Bibcode: 2006AJ....132..161G. 
  4. ↑ Cousins, A. W. J.; Stoy, R. H. (1963). Photoelectric magnitudes and colours of southern stars. Bibcode: 1963pmcs.book.....C. 
  5. ↑ 5.0 5.1 5.2 5.3 5.4 5.5 Lovis, C.; Mayor, M.; Bouchy, F.; Pepe, F.; Queloz, D.; Santos, N. C.; Udry, S.; Benz, W. et al. (30 June 2005). "The HARPS search for southern extra-solar planets". Astronomy & Astrophysics 437 (3): 1121–1126. doi:10.1051/0004-6361:20052864. ISSN 0004-6361. Bibcode: 2005A&A...437.1121L. 
  6. ↑ 6.0 6.1 Margaret C Turnbull (2015). "ExoCat-1: The Nearby Stellar Systems Catalog for Exoplanet Imaging Missions". arXiv:1510.01731 [astro-ph.SR].
  7. ↑ 7.0 7.1 Stassun, Keivan G. et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S. 
  8. ↑ 8.0 8.1 8.2 8.3 Bonfanti, A.; Ortolani, S.; Piotto, G.; Nascimbeni, V. (12 February 2015). "Revising the ages of planet-hosting stars". Astronomy & Astrophysics 575: A18. doi:10.1051/0004-6361/201424951. ISSN 0004-6361. Bibcode: 2015A&A...575A..18B. 
  9. ↑ Sousa, S. G.; Santos, N. C.; Mayor, M.; Udry, S.; Casagrande, L.; Israelian, G.; Pepe, F.; Queloz, D. et al. (4 June 2008). "Spectroscopic parameters for 451 stars in the HARPS GTO planet search program". Astronomy & Astrophysics 487 (1): 373–381. doi:10.1051/0004-6361:200809698. ISSN 0004-6361. Bibcode: 2008A&A...487..373S. 
  10. ↑ 10.0 10.1 Tsantaki, M.; Sousa, S. G.; Santos, N. C.; Montalto, M.; Delgado-Mena, E.; Mortier, A.; Adibekyan, V.; Israelian, G. (October 2014). "Spectroscopic parameters for solar-type stars with moderate-to-high rotation". Astronomy & Astrophysics 570: A80. doi:10.1051/0004-6361/201424257. ISSN 0004-6361. Bibcode: 2014A&A...570A..80T. 
  11. ↑ 11.0 11.1 Llorente de Andrés, F.; Chavero, C.; de la Reza, R.; Roca-Fàbrega, S.; Cifuentes, C. (October 2021). "The evolution of lithium in FGK dwarf stars". Astronomy & Astrophysics 654: A137. doi:10.1051/0004-6361/202141339. ISSN 0004-6361. Bibcode: 2021A&A...654A.137L. 
  12. ↑ "HD 101930". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+101930. 
  13. ↑ Luyten, W. J. (June 1995). "NLTT Catalogue (Luyten, 1979)". VizieR On-line Data Catalog: I/98A. Originally published in: 1979nltt.book.....L. Bibcode: 1995yCat.1098....0L. 
  14. ↑ 14.0 14.1 Mugrauer, M.; Seifahrt, A.; Neuhauser, R. (11 July 2007). "The multiplicity of planet host stars - new low-mass companions to planet host stars". Monthly Notices of the Royal Astronomical Society 378 (4): 1328–1334. doi:10.1111/j.1365-2966.2007.11858.x. ISSN 0035-8711. Bibcode: 2007MNRAS.378.1328M. 
  15. ↑ Lindgren, Sara; Heiter, Ulrike; Seifahrt, Andreas (February 2016). "Metallicity determination of M dwarfs". Astronomy & Astrophysics 586: A100. doi:10.1051/0004-6361/201526602. ISSN 0004-6361. Bibcode: 2016A&A...586A.100L. 

External links

Coordinates: Sky map 11h 43m 30.11s, −58° 00′ 24.793″



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