Gliese 486

Gliese 486, also known as Wolf 437, is a M-type main-sequence star in the constellation Virgo. Its surface temperature is 3340±54 K. Gliese 486 is similar to the Sun in its concentration of heavy elements, with a metallicity Fe/H index of 0.07±0.16. It was suspected to be a flare star,[6] although measurements available in 2019 did not reveal any flares.[7]

Gliese 486

Observation data
Epoch J2000      Equinox J2000
Constellation Virgo
Right ascension 12h 47m 56.6249s[1]
Declination +09° 45′ 05.0319″[1]
Apparent magnitude (V) 11.395
Characteristics
Evolutionary stage main-sequence star
Spectral type M3.5V[2]
Astrometry
Radial velocity (Rv)19.106 km/s
Proper motion (μ) RA: -1008.267[3] mas/yr
Dec.: -460.034[3] mas/yr
Parallax (π)123.776 ± 0.0329 mas[3]
Distance26.351 ± 0.007 ly
(8.079 ± 0.002 pc)
Details[4]
Mass0.323±0.015 M☉
Radius0.328±0.011 R☉
Luminosity0.01210±0.00023 L☉
Temperature3340±54 K
Metallicity [Fe/H]0.07±0.16 dex
Rotation130.1+1.6
−1.2 d
Rotational velocity (v sin i)<2[5] km/s
Other designations
Gaia DR2 3735000631158990976, GJ 486, HIP 62452, Wolf 437, TOI-1827, TYC 882-1111-1, 2MASS J12475664+0945050[1]
Database references
SIMBADdata

The star has an unremarkable magnetic field in the chromosphere of about 1.6 kilogauss.[5] It is rotating very slowly and is likely to be very old, belonging kinematically to the old thin disk of the Milky Way.[8]

Multiplicity surveys did not detect any stellar companions to Gliese 486 as at 2020.[9]

Planetary system
Artistic impression of the surface of the hot super-Earth Gliese 486b.

In 2021, one planet, named Gliese 486 b, was discovered on a tight, circular orbit.[4] It represents a rare class of rocky exoplanet suitable for spectroscopic characterization in the near future,[10] as soon as the James Webb Space Telescope is launched.[11]


The Gliese 486 planetary system[4]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b 2.82+0.11
−0.12 M🜨		 0.01734+0.00026
−0.00027		 1.467119+0.000031
−0.000030		 <0.05 88.4+1.1
−1.4°		 1.305+0.063
−0.067 R🜨

References
  1. "Wolf 437". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-03-10.
  2. Bozhinova, I.; Helling, Ch.; Scholz, A. (2014), "Planetary host stars: Evaluating uncertainties in cool model atmospheres", Monthly Notices of the Royal Astronomical Society, 450: 160–182, arXiv:1405.5416, doi:10.1093/mnras/stv613
  3. 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. Gaia EDR3 record for this source at VizieR.
  4. Trifonov, T.; et al. (2021), "A nearby transiting rocky exoplanet that is suitable for atmospheric investigation", Science, 371 (6533): 1038–1041, arXiv:2103.04950, Bibcode:2021Sci...371.1038T, doi:10.1126/science.abd7645, PMID 33674491, S2CID 232124642
  5. Moutou, Claire; Hébrard, Élodie M.; Morin, Julien; Malo, Lison; Fouqué, Pascal; Torres-Rivas, Andoni; Martioli, Eder; Delfosse, Xavier; Artigau, Étienne; Doyon, René (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, doi:10.1093/mnras/stx2306
  6. O'Donoghue, D.; Koen, C.; Kilkenny, D.; Stobie, R. S.; Koester, D.; Bessell, M. S.; Hambly, N.; MacGillivray, H. (2003), "The DA+d Me eclipsing binary EC13471-1258: its cup runneth over ... Just", Monthly Notices of the Royal Astronomical Society, 345 (2): 506–528, arXiv:astro-ph/0307144, Bibcode:2003MNRAS.345..506O, doi:10.1046/j.1365-8711.2003.06973.x, S2CID 17408072
  7. Vida, Krisztián; Leitzinger, Martin; Kriskovics, Levente; Seli, Bálint; Odert, Petra; Kovács, Orsolya Eszter; Korhonen, Heidi; Van Driel-Gesztelyi, Lidia (2019), "The quest for stellar coronal mass ejections in late-type stars", Astronomy & Astrophysics, 623: A49, arXiv:1901.04229, doi:10.1051/0004-6361/201834264, S2CID 119095055
  8. ROTATION AND MAGNETIC ACTIVITY IN A SAMPLE OF M-DWARFS
  9. Lamman, Claire; Baranec, Christoph; Berta-Thompson, Zachory K.; Law, Nicholas M.; Schonhut-Stasik, Jessica; Ziegler, Carl; Salama, Maïssa; Jensen-Clem, Rebecca; Duev, Dmitry A.; Riddle, Reed; Kulkarni, Shrinivas R.; Winters, Jennifer G.; Irwin, Jonathan M. (2020), "Robo-AO M-dwarf Multiplicity Survey: Catalog", The Astronomical Journal, 159 (4): 139, arXiv:2001.05988, Bibcode:2020AJ....159..139L, doi:10.3847/1538-3881/ab6ef1, S2CID 210718832
  10. Hot Super-Earth Discovered 26 Light-Years Away
  11. Newfound exoplanet could be 'Rosetta Stone' for studies of alien atmospheres

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