LP 816-60

LP 816-60 is a single^[3] red dwarf star of spectral type M4, located in constellation Capricornus at 18.6 light-years from Earth.^[1]

LP 816-60

Observation data Epoch J2000      Equinox J2000
Constellation	Capricornus
Right ascension	20h 52m 33.01679s[1]
Declination	−16° 58′ 29.0249″[1]
Apparent magnitude (V)	11.458[2]
Characteristics
Spectral type	M4[3]
Astrometry
Radial velocity (Rv)	8.5[4] km/s
Proper motion (μ)	RA: -309.115 mas/yr[5] Dec.: 37.051 mas/yr[5]
Parallax (π)	177.9312 ± 0.0365 mas[5]
Distance	18.330 ± 0.004 ly (5.620 ± 0.001 pc)
Details[6]
Mass	0.224±0.022 M☉
Radius	0.266±0.012 R☉
Surface gravity (log g)	4.584[7] cgs
Temperature	3030±27[8] K
Metallicity [Fe/H]	-0.11±0.07[8] dex
Rotation	67.6±0.1 d.[9]
Rotational velocity (v sin i)	2.70±0.66[7] km/s
Age	2.57+8.15 −1.95 Gyr
Other designations
HIP 103039[1], LP 816-60, NLTT 50038[10], TYC 6348-400-1[11], 2MASS J20523304-1658289
Database references
SIMBAD	data
LP 816-60 Location of LP 816-60 in the constellation Capricornus

The discovery name of this star is LP 816-60,^[12] which indicates that its discovery was published between 1963 and 1981 in University of Minnesota, Minneapolis.^[13] LP 816-60 is known at least from 1979, when it was included to Luyten's catalogue NLTT.^[10]

No massive planets were detected around LP 816-60 as in 2013.^[3] The star has a magnetic starspot cycle of 10.6±1.7 years,^[9] and weak magnetic fields in chromosphere averaging 4.4 G.^[14]

References

1. Perryman; et al. (1997). "HIP 103039". The Hipparcos and Tycho Catalogues. Retrieved 2014-11-29.
2. Koen, C.; Kilkenny, D.; van Wyk, F.; Marang, F. (2010). "UBV(RI)C JHK observations of Hipparcos-selected nearby stars". Monthly Notices of the Royal Astronomical Society. 403 (4): 1949–1968. Bibcode:2010MNRAS.403.1949K. doi:10.1111/j.1365-2966.2009.16182.x.
3. Montet, Benjamin T.; Crepp, Justin R.; Johnson, John Asher; Howard, Andrew W.; Marcy, Geoffrey W. (2013), "The Trends High-Contrast Imaging Survey. Iv. The Occurrence Rate of Giant Planets Around M Dwarfs", The Astrophysical Journal, 781: 28, arXiv:1307.5849, doi:10.1088/0004-637X/781/1/28, S2CID 26620552
4. Henry, Todd J.; Jao, Wei-Chun; Winters, Jennifer G.; Dieterich, Sergio B.; Finch, Charlie T.; Ianna, Philip A.; Riedel, Adric R.; Silverstein, Michele L.; Subasavage, John P.; Vrijmoet, Eliot Halley (2018), "The Solar Neighborhood XLIV: RECONS Discoveries within 10 parsecs", The Astronomical Journal, 155 (6): 265, arXiv:1804.07377, Bibcode:2018AJ....155..265H, doi:10.3847/1538-3881/aac262, S2CID 53983430
5. 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.
6. Mann, Andrew W.; Feiden, Gregory A.; Gaidos, Eric; Boyajian, Tabetha; Braun, Kaspar von (2015), "How to Constrain Your M Dwarf: Measuring Effective Temperature, Bolometric Luminosity, Mass, and Radius", The Astrophysical Journal, 804 (1): 64, arXiv:1501.01635, Bibcode:2015ApJ...804...64M, doi:10.1088/0004-637X/804/1/64, S2CID 19269312
7. Hojjatpanah, S.; Figueira, P.; Santos, N. C.; Adibekyan, V.; Sousa, S. G.; Delgado-Mena, E.; Alibert, Y.; Cristiani, S.; González Hernández, J. I.; Lanza, A. F.; Di Marcantonio, P.; Martins, J. H. C.; Micela, G.; Molaro, P.; Neves, V.; Oshagh, M.; Pepe, F.; Poretti, E.; Rojas-Ayala, B.; Rebolo, R.; Suárez Mascareño, A.; Zapatero Osorio, M. R. (2019), "Catalog for the ESPRESSO blind radial velocity exoplanet survey", Astronomy & Astrophysics, 629: A80, arXiv:1908.04627, Bibcode:2019A&A...629A..80H, doi:10.1051/0004-6361/201834729, S2CID 199552090
8. Antoniadis-Karnavas, A.; Sousa, S. G.; Delgado-Mena, E.; Santos, N. C.; Teixeira, G. D. C.; Neves, V. (2020), "ODUSSEAS: A machine learning tool to derive effective temperature and metallicity for M dwarf stars", Astronomy & Astrophysics, 636: A9, arXiv:2002.09367, Bibcode:2020A&A...636A...9A, doi:10.1051/0004-6361/201937194, S2CID 211252698
9. Suárez Mascareño, A.; Rebolo, R.; González Hernández, J. I. (2016), "Magnetic cycles and rotation periods of late-type stars from photometric time series", Astronomy & Astrophysics, 595: A12, arXiv:1607.03049, Bibcode:2016A&A...595A..12S, doi:10.1051/0004-6361/201628586, S2CID 118555782
10. Luyten, Willem Jacob (1979). "NLTT 50038". NLTT Catalogue.
11. Perryman; et al. (1997). "HIP 103039". The Hipparcos and Tycho Catalogues. Retrieved 2014-11-29.
12. Kirkpatrick, J. Davy; Gelino, Christopher R.; Cushing, Michael C.; Mace, Gregory N.; Griffith, Roger L.; Skrutskie, Michael F.; Marsh, Kenneth A.; Wright, Edward L.; Eisenhardt, Peter R.; McLean, Ian S.; Mainzer, Amy K.; Burgasser, Adam J.; Tinney, Chris G.; Parker, Stephen; Salter, Graeme (2012). "Further Defining Spectral Type "Y" and Exploring the Low-mass End of the Field Brown Dwarf Mass Function". The Astrophysical Journal. 753 (2): 156. arXiv:1205.2122. Bibcode:2012ApJ...753..156K. doi:10.1088/0004-637X/753/2/156. S2CID 119279752.
13. Dictionary of Nomenclature of Celestial Objects. LP entry. SIMBAD. Centre de Données astronomiques de Strasbourg.
14. Moutou, C.; Hébrard, E. M.; Morin, J.; Malo, L.; Fouqué, P.; Torres-Rivas, A.; Martioli, E.; Delfosse, X.; Artigau, E.; Doyon, R. (2017), "SPIRou input catalogue: Activity, rotation and magnetic field of cool dwarfs", Monthly Notices of the Royal Astronomical Society, 472 (4): 4563–4586, arXiv:1709.01650, Bibcode:2017MNRAS.472.4563M, doi:10.1093/mnras/stx2306