Astronomy:GJ 3379

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Short description: Nearest star in the constellation Orion
GJ 3379
Observation data
Equinox J2000.0]] (ICRS)
Constellation Orion
Right ascension  06h 00m 03.50386s[1]
Declination +02° 42′ 23.5968″[1]
Apparent magnitude (V) +11.307[2]
Characteristics
Spectral type M3.5Ve[3] or dM4.0[4]
B−V color index 1.667[2]
Astrometry
Radial velocity (Rv)+30.228±0.0038[5] km/s
Proper motion (μ) RA: +309.487[1] mas/yr
Dec.: −40.640[1] mas/yr
Parallax (π)192.0135 ± 0.0310[6] mas
Distance16.986 ± 0.003 ly
(5.2080 ± 0.0008 pc)
Absolute magnitude (MV)+12.71[3]
Details[4]
Mass0.2312±0.0058 M☉
Radius0.2457±0.0078 R☉
Luminosity0.006329±0.000088 L☉
Luminosity (bolometric)0.0086[7] L☉
Surface gravity (log g)5.10±0.07 cgs
Temperature3,284±51 K
Metallicity [Fe/H]−0.12±0.16 dex
Rotation1.809 d[8]
Rotational velocity (v sin i)5.8±0.3 km/s[3] km/s
Other designations
GJ 3379, WDS J06001+0242A, G 99-49, G 106-17, LTT 17897, NLTT 15908, PLX 1383.02, TYC 134-605-1, 2MASS J06000351+0242236[9]
Database references
SIMBADdata
GJ 3379 is located in the constellation Orion
GJ 3379 is located in the constellation Orion
GJ 3379
Location of GJ 3379 in the constellation Orion

GJ 3379 (Giclas 99-49) is the nearest star in the Orion constellation, located at a distance of 17 light years from the Sun based on parallax. It is a single star[3] with an apparent visual magnitude of +11.31[2] and an absolute magnitude of +12.71,[3] therefore, the star is not visible with the naked eye. It is positioned in the upper left part of the Orion constellation, to the SSE of Betelgeuse. This star is drifting further away with a radial velocity of +30.0 kilometers per second.[5] In the past, this star had a relatively close encounter with the Solar System. Some 161,000±6,000 years ago, it achieved a minimum distance of 4.08 ± 0.20 ly (1.25 ± 0.06 pc).[10]

Physical characteristics

This star is a small red dwarf with a stellar classification of M3.5V[3] – an M-type main-sequence star. It is much smaller, cooler, and less massive than the Sun, radiating only 0.6% of the Sun's luminosity.[4] This is a very active[11] star that varies in brightness with an amplitude of 0.0074±0.0029 magnitude, modulated by a rapid rotation period of 1.8 days.[8] The magnetic field strength has been measured as 2.3 kG. It is a source of X-ray emission with a luminosity of 9.5×1027 erg s−1.[12]

According to the SIMBAD database, the star is classified as an eruptive variable.[9]

References

  1. ↑ 1.0 1.1 1.2 1.3 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. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  2. ↑ 2.0 2.1 2.2 Zacharias, N. et al. (2012). "The fourth US Naval Observatory CCD Astrograph Catalog (UCAC4)". VizieR On-line Data Catalog 1322. Bibcode: 2012yCat.1322....0Z. 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 Davison, Cassy L. et al. (March 2015). "A 3D Search for Companions to 12 Nearby M-Dwarfs". The Astronomical Journal 149 (3): 106. doi:10.1088/0004-6256/149/3/106. Bibcode: 2015AJ....149..106D. 
  4. ↑ 4.0 4.1 4.2 Schweitzer, A. et al. (May 2019). "The CARMENES search for exoplanets around M dwarfs. Different roads to radii and masses of the target stars". Astronomy & Astrophysics 625: 16. doi:10.1051/0004-6361/201834965. A68. Bibcode: 2019A&A...625A..68S. 
  5. ↑ 5.0 5.1 Soubiran, C. et al. (2018). "Gaia Data Release 2. The catalogue of radial velocity standard stars". Astronomy and Astrophysics 616: A7. doi:10.1051/0004-6361/201832795. Bibcode: 2018A&A...616A...7S. 
  6. ↑ Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G.  Gaia EDR3 record for this source at VizieR.
  7. ↑ Khata, Dhrimadri et al. (April 2020). "Understanding the physical properties of young M dwarfs: NIR spectroscopic studies". Monthly Notices of the Royal Astronomical Society 493 (3): 4533–4550. doi:10.1093/mnras/staa427. Bibcode: 2020MNRAS.493.4533K. 
  8. ↑ 8.0 8.1 Newton, Elisabeth R. et al. (April 2016). "The Rotation and Galactic Kinematics of Mid M Dwarfs in the Solar Neighborhood". The Astrophysical Journal 821 (2): 21. doi:10.3847/0004-637X/821/2/93. 93. Bibcode: 2016ApJ...821...93N. 
  9. ↑ 9.0 9.1 "G 99-49". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=G+99-49. 
  10. ↑ Bobylev, V. V. (2017). "Search for close stellar encounters with the solar system from data on nearby dwarfs". Astronomy Reports 61 (10): 883–890. doi:10.1134/S106377291710002X. ISSN 1063-7729. Bibcode: 2017ARep...61..883B. 
  11. ↑ Zechmeister, M. et al. (January 2018). "Spectrum radial velocity analyser (SERVAL). High-precision radial velocities and two alternative spectral indicators". Astronomy & Astrophysics 609: 13. doi:10.1051/0004-6361/201731483. A12. Bibcode: 2018A&A...609A..12Z. 
  12. ↑ Feiden, Gregory A.; Chaboyer, Brian (December 2013). "Magnetic Inhibition of Convection and the Fundamental Properties of Low-mass Stars. I. Stars with a Radiative Core". The Astrophysical Journal 779 (2): 25. doi:10.1088/0004-637X/779/2/183. 183. Bibcode: 2013ApJ...779..183F. 

External links

Coordinates: Sky map 06h 00m 3.495s, +02° 42′ 23.67″



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