| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Eridanus |
| Right ascension | 03 38 15.69799 |
| Declination | −11° 29′ 13.5050″ |
| Apparent magnitude (V) | +13.010 |
| Characteristics | |
| Spectral type | M2.5VI |
| U−B color index | +1.385 |
| B−V color index | +1.605 |
| R−I color index | 1.184 |
| Astrometry | |
| Radial velocity (Rv) | −84.88±0.56 km/s |
| Proper motion (μ) | RA: 1,458.201 mas/yr Dec.: −2,696.545 mas/yr |
| Parallax (π) | 61.8861 ± 0.0220 mas |
| Distance | 52.70 ± 0.02 ly (16.159 ± 0.006 pc) |
| Absolute magnitude (MV) | 10.608 |
| Details | |
| Mass | 0.255 M☉ |
| Radius | 0.411±0.051 R☉ 0.372±0.076 R☉ 0.202±0.012 R☉ |
| Luminosity | 0.0055 L☉ |
| Temperature | 3,488±50 K |
| Metallicity | −0.28±0.15 dex |
| Rotational velocity (v sin i) | 9.80 km/s |
| Other designations | |
| GJ 1062, LHS 20, LTT 1717, Ross 578, 2MASS J03381558-1129102 | |
| Database references | |
| SIMBAD | data |
| ARICNS | data |
GJ 1062 is a single red dwarf star in the constellation Eridanus, positioned about two degrees to the SSE of Epsilon Eridani. 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, requiring a telescope with at least a 25 cm (10 in) aperture to view. 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. The star has a high proper motion, traversing the sky at the rate of 3.033 arcseconds per year.
This is an M-type subdwarf star with a stellar classification of M2.5VI. 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. GJ 1062 is considered a likely member of the halo population, and thus is a MACHO.
References
- ^ 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.
- ^ 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.
- ^ 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.
- ^ Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
- ^ 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.
- ^ 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.
- ^ 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.
