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]
| 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 | |
| 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
edit- ^ a b c d e f 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.
- ^ a b c d e f g 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.
- ^ a b 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.
- ^ a b Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
- ^ a b 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.
- ^ a b 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.
- ^ a b 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.
- ^ "GJ 1062". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 4 December 2016.
- ^ 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.
- ^ "The astronomical magnitude scale". International Comet Quarterly. Retrieved 2020-12-31.
- ^ Luyten, W. J. (June 1995). "NLTT Catalogue". VizieR Online Data Catalog. Bibcode:1995yCat.1098....0L.
- ^ 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.
- ^ 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.