GJ 1062

GJ 1062 is a single^[6] red dwarf star in the constellation Eridanus, positioned about two degrees to the SSE of Epsilon Eridani.^[9] It is also known as LHS 20 and Ross 578. The star is invisible to the naked eye with an apparent visual magnitude of +13.0,^[2] requiring a telescope with at least a 25 cm (10 in) aperture to view.^[10] It is located at a distance of 52.7 light years from the Sun based on parallax, but is drifting closer with a radial velocity of −85 km/s.^[1] The star has a high proper motion, traversing the sky at the rate of 3.033 arcseconds per year.^[11]

GJ 1062

Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Eridanus
Right ascension	03h 38m 15.69799s[1]
Declination	−11° 29′ 13.5050″[1]
Apparent magnitude (V)	+13.010[2]
Characteristics
Spectral type	M2.5VI[3]
U−B color index	+1.385[4]
B−V color index	+1.605[4]
R−I color index	1.184[2]
Astrometry
Radial velocity (Rv)	−84.88±0.56[1] km/s
Proper motion (μ)	RA: 1,458.201 mas/yr[1] Dec.: −2,696.545 mas/yr[1]
Parallax (π)	61.8861 ± 0.0220 mas[1]
Distance	52.70 ± 0.02 ly (16.159 ± 0.006 pc)
Absolute magnitude (MV)	10.608[5]
Details
Mass	0.255[6] M☉
Radius	0.411±0.051 R☉[2] 0.372±0.076 R☉[5] 0.202±0.012[7] R☉
Luminosity	0.0055[2] L☉
Temperature	3,488±50[2] K
Metallicity [Fe/H]	−0.28±0.15[7] dex
Rotational velocity (v sin i)	9.80[2] km/s
Other designations
GJ 1062, LHS 20, LTT 1717, Ross 578, 2MASS J03381558-1129102[8]
Database references
SIMBAD	data
ARICNS	data

This is an M-type subdwarf star with a stellar classification of M2.5VI.^[3] It was one of the first three subdwarfs to be definitively identified by G. Kuiper in 1940, the other two being Kapteyn's Star and Wolf 1106.^[12] GJ 1062 is considered a likely member of the halo population, and thus is a MACHO.^[13]

References

1. 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.
2. Houdebine, E. R. (2010). "Observation and modelling of main-sequence star chromospheres - XIV. Rotation of dM1 stars". Monthly Notices of the Royal Astronomical Society. 407 (3): 1657. Bibcode:2010MNRAS.407.1657H. doi:10.1111/j.1365-2966.2010.16827.x.
3. Gizis, John E. (1997). "M-Subdwarfs: Spectroscopic Classification and the Metallicity Scale". Astronomical Journal. 113: 806–822. arXiv:astro-ph/9611222. Bibcode:1997AJ....113..806G. doi:10.1086/118302. S2CID 16863021.
4. Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
5. Houdebine, E. R.; et al. (May 2016). "Rotation-Activity Correlations in K and M Dwarfs. I. Stellar Parameters and Compilations of v sin I and P/sin I for a Large Sample of Late-K and M Dwarfs". The Astrophysical Journal. 822 (2): 38. arXiv:1604.07920. Bibcode:2016ApJ...822...97H. doi:10.3847/0004-637X/822/2/97. S2CID 119118088. 97.
6. Winters, Jennifer G.; et al. (June 2019). "The Solar Neighborhood. XLV. The Stellar Multiplicity Rate of M Dwarfs Within 25 pc". The Astronomical Journal. 157 (6): 32. arXiv:1901.06364. Bibcode:2019AJ....157..216W. doi:10.3847/1538-3881/ab05dc. S2CID 86859146. 216.
7. Kesseli, Aurora Y.; et al. (February 2019). "Radii of 88 M Subdwarfs and Updated Radius Relations for Low-metallicity M-dwarf Stars". The Astronomical Journal. 157 (2): 17. arXiv:1810.07702. Bibcode:2019AJ....157...63K. doi:10.3847/1538-3881/aae982. S2CID 119325209. 63.
8. "GJ 1062". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 4 December 2016.
9. Sinnott, Roger W.; Perryman, Michael A. C. (1997). Millennium Star Atlas. Vol. 1. Sky Publishing Corporation and the European Space Agency. p. 308. ISBN 0-933346-84-0.
10. "The astronomical magnitude scale". International Comet Quarterly. Retrieved 2020-12-31.
11. Luyten, W. J. (June 1995). "NLTT Catalogue". VizieR Online Data Catalog. Bibcode:1995yCat.1098....0L.
12. Kotoneva, E.; et al. (August 2005). "A study of Kapteyn's star". Astronomy and Astrophysics. 438 (3): 957–962. Bibcode:2005A&A...438..957K. doi:10.1051/0004-6361:20042287.
13. Fuchs, B.; Jahreiß, H. (January 1998). "Halo stars in the immediate solar neighbourhood". Astronomy and Astrophysics. 329: 81. arXiv:astro-ph/9708209. Bibcode:1998A&A...329...81F.