GJ 3379
Nearest star 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
^ a b c d 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 .
^ a b c Zacharias, N.; et al. (2012). "The fourth US Naval Observatory CCD Astrograph Catalog (UCAC4)". VizieR On-line Data Catalog . 1322 . Bibcode :2012yCat.1322....0Z .
^ a b c d e f Davison, Cassy L.; et al. (March 2015). "A 3D Search for Companions to 12 Nearby M-Dwarfs". The Astronomical Journal . 149 (3): 106. arXiv :1501.05012 . Bibcode :2015AJ....149..106D . doi :10.1088/0004-6256/149/3/106 . S2CID 9719725 .
^ a b c 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. arXiv :1904.03231 . Bibcode :2019A&A...625A..68S . doi :10.1051/0004-6361/201834965 . S2CID 102351979 . A68.
^ a b Soubiran, C.; et al. (2018). "Gaia Data Release 2. The catalogue of radial velocity standard stars". Astronomy and Astrophysics . 616 : A7. arXiv :1804.09370 . Bibcode :2018A&A...616A...7S . doi :10.1051/0004-6361/201832795 . S2CID 52952408 .
^ Brown, A. G. A. ; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties" . Astronomy & Astrophysics . 649 : A1. arXiv :2012.01533 . Bibcode :2021A&A...649A...1G . doi :10.1051/0004-6361/202039657 . S2CID 227254300 . (Erratum: doi :10.1051/0004-6361/202039657e ) . Gaia EDR3 record for this source at VizieR .
^ 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. arXiv :2002.05762 . Bibcode :2020MNRAS.493.4533K . doi :10.1093/mnras/staa427 .
^ a b 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. arXiv :1511.00957 . Bibcode :2016ApJ...821...93N . doi :10.3847/0004-637X/821/2/93 . S2CID 89615849 . 93.
^ a b "G 99-49" . SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 18 August 2017 .
^ Bobylev, V. V. (2017). "Search for close stellar encounters with the solar system from data on nearby dwarfs". Astronomy Reports . 61 (10): 883–890. arXiv :1708.03300 . Bibcode :2017ARep...61..883B . doi :10.1134/S106377291710002X . ISSN 1063-7729 . S2CID 119424830 .
^ Zechmeister, M.; et al. (January 2018). "Spectrum radial velocity analyser (SERVAL). High-precision radial velocities and two alternative spectral indicators". Astronomy & Astrophysics . 609 : 13. arXiv :1710.10114 . Bibcode :2018A&A...609A..12Z . doi :10.1051/0004-6361/201731483 . S2CID 59449762 . A12.
^ 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. arXiv :1309.0033 . Bibcode :2013ApJ...779..183F . doi :10.1088/0004-637X/779/2/183 . S2CID 118558471 . 183.
External links
Primary member type
Celestial objects by systems. Secondary members are listed in small print.
Main-sequence stars
G-type
Tau Ceti (11.9118± 0.0074 ly)
4 (8?) planets: (b), (c), (d), e, f, g, h, (i)
K-type M-type(red dwarfs)
Ross 248 (10.3057± 0.0014 ly)
Lacaille 9352 (10.7241± 0.0007 ly)
2 (3?) planets: b, c, d?
Ross 128 (11.0074± 0.0011 ly)
planet b
EZ Aquarii (11.109± 0.034 ly)
2 red dwarfs: B, C
Struve 2398 (11.4908± 0.0009 ly)
red dwarf B
2? planets: Bb?, Bc?
Groombridge 34 (11.6191± 0.0008 ly)
red dwarf B
2 planets: Ab , Ac
DX Cancri (11.6797± 0.0027 ly)
GJ 1061 (11.9839± 0.0014 ly)
3 planets: b, c, d
YZ Ceti (12.1222± 0.0015 ly)
3 planets: b, c, d
Luyten's Star (12.3485± 0.0019 ly)
2 (4?) planets: b , c, d?, e?
Teegarden's Star (12.4970± 0.0045 ly)
2 planets: b , c
Kapteyn's Star (12.8308± 0.0008 ly)
Lacaille 8760 (12.9472± 0.0018 ly)
SCR 1845−6357 (13.0638± 0.0070 ly)
T-type brown dwarf B
Kruger 60 (13.0724± 0.0052 ly)
red dwarf B
DENIS J1048−3956 (13.1932± 0.0027 ly)
Ross 614 (13.363± 0.040 ly)
red dwarf B
Wolf 1061 (14.0500± 0.0016 ly)
3 planets: b , c , d
Gliese 1 (14.1747± 0.0022 ly)
TZ Arietis (14.5780± 0.0046 ly)
planet b
Wolf 424 (14.595± 0.031 ly)
red dwarf B
Gliese 687 (14.8395± 0.0014 ly)
2 planets: b, c
Gliese 674 (14.8492± 0.0018 ly)
planet b
LHS 292 (14.8706± 0.0041 ly)