Gliese 402

Gliese 402

A visual band light curve for EE Leonis, adapted from Weis (1994)[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Leo[2]
Right ascension 10h 50m 52.03124s[3]
Declination +06° 48′ 29.2596″[3]
Apparent magnitude (V) 11.64 - 11.70[4]
Characteristics
Spectral type M4.0V[5]
U−B color index +1.16[6]
B−V color index +1.66[6]
V−R color index +1.24[6]
R−I color index +1.57[6]
Variable type BY Dra[4]
Astrometry
Radial velocity (Rv)−1.24±0.23[3] km/s
Proper motion (μ) RA: −856.289 mas/yr[3]
Dec.: −818.583 mas/yr[3]
Parallax (π)143.5391±0.0286 mas[3]
Distance22.722 ± 0.005 ly
(6.967 ± 0.001 pc)
Absolute magnitude (MV)12.47[6]
Details
Mass0.268+0.007
−0.006[7] M☉
Radius0.284±0.011[7] R☉
Luminosity0.00728±0.00025[8] L☉
Surface gravity (log g)4.5[9] cgs
Temperature3,240+65
−60[7] K
Metallicity [Fe/H]−0.06[10] dex
Other designations
EE Leo, GJ 402, HIP 53020, G 45-8, G 44-40, LFT 742, LHS 294, LTT 12891, PLX 2524, Wolf 358[11]
Database references
SIMBADdata
ARICNSdata

Gliese 402 is a star located 22.722 light-years from the Solar System. Located in the constellation of Leo, it is also known as Wolf 358 from its entry in Max Wolf's star catalogue.

Gliese 402 is a BY Draconis variable, with its apparent magnitude varying between 11.64 and 11.70. The brightness changes are due to starspots and chromospheric activity combined with the rotation of the star. It has been given the variable star designation EE Leonis.[4]

Like the vast majority of stars in the Solar neighborhood, Gliese 402 is a dim red dwarf. With an apparent magnitude +11.66, it is far too dim to be seen with the naked eye; it can only be seen with a telescope. Its luminosity is only 0.73% that of the Sun.[8] Its spectral type is M4V[5] and its effective temperature is 3,240 K.[7] Its physical characteristics are quite similar to those of Ross 128 or Kruger 60 B, with a radius of about 26.8% of the Sun.[7] Its projected rotation speed is at most 2.3 km/s or less,[10] while its metallicity is slightly lower than that of the Sun.[10]

The stars nearest to Gliese 402 are Gliese 393, at 3.43 light years, Gliese 408, at 6.26 light years, and Gliese 382 at 6.66 light years.[12]

See also

References

  1. ^ Weis, Edward W. (March 1994). "Long Term Variability in Dwarf M Stars". The Astronomical Journal. 107 (3): 1135–1140. Bibcode:1994AJ....107.1135W. doi:10.1086/116925. Archived from the original on 1 March 2022. Retrieved 19 January 2022.
  2. ^ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.
  3. ^ a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  4. ^ a b c Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
  5. ^ a b Alonso-Floriano, F. J.; Morales, J. C.; Caballero, J. A.; Montes, D.; Klutsch, A.; Mundt, R.; Cortés-Contreras, M.; Ribas, I.; Reiners, Ansgar; Amado, P. J.; Quirrenbach, A.; Jeffers, S. V. (2015). "CARMENES input catalogue of M dwarfs" (PDF). Astronomy & Astrophysics. 577: A128. arXiv:1502.07580. Bibcode:2015A&A...577A.128A. doi:10.1051/0004-6361/201525803. S2CID 53135130.
  6. ^ a b c d e "ARICNS 4C00824". ARICNS. Archived from the original on 31 August 2021. Retrieved 23 January 2017.
  7. ^ a b c d e Pineda, J. Sebastian; et al. (September 2021). "The M-dwarf Ultraviolet Spectroscopic Sample. I. Determining Stellar Parameters for Field Stars". The Astrophysical Journal. 918 (1): 23. arXiv:2106.07656. Bibcode:2021ApJ...918...40P. doi:10.3847/1538-4357/ac0aea. S2CID 235435757. 40.
  8. ^ a b Hardegree-Ullman, Kevin K.; Apai, Dániel; Bergsten, Galen J.; Pascucci, Ilaria; López-Morales, Mercedes (2023-06-01). "Bioverse: A Comprehensive Assessment of the Capabilities of Extremely Large Telescopes to Probe Earth-like O2 Levels in Nearby Transiting Habitable-zone Exoplanets". The Astronomical Journal. 165 (6): 267. arXiv:2304.12490. Bibcode:2023AJ....165..267H. doi:10.3847/1538-3881/acd1ec. ISSN 0004-6256.
  9. ^ Lépine, Sébastien; et al. (2013). "A Spectroscopic Catalog of the Brightest (J < 9) M Dwarfs in the Northern Sky". The Astronomical Journal. 145 (4): 102. arXiv:1206.5991. Bibcode:2013AJ....145..102L. doi:10.1088/0004-6256/145/4/102. S2CID 117144290.
  10. ^ a b c Jenkins, J. S.; Ramsey, L. W.; Jones, H. R. A.; Pavlenko, Y.; Gallardo, J.; Barnes, J. R.; Pinfield, D. J. (2009). "Rotational Velocities for M Dwarfs". The Astrophysical Journal. 704 (2): 975–988. arXiv:0908.4092. Bibcode:2009ApJ...704..975J. doi:10.1088/0004-637X/704/2/975. S2CID 119203469.
  11. ^ "Wolf 358". SIMBAD. Centre de données astronomiques de Strasbourg.
  12. ^ "Stars within 15 light-years of Wolf 358". The Internet Stellar Database.
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