Astronomy:K2-58

From HandWiki
Short description: Star in the constellation Aquarius

Coordinates: Sky map 22h 15m 17.2364s, −14° 02′ 59.3151″

K2-58
Observation data
Equinox J2000.0]] (ICRS)
Constellation Aquarius
Right ascension  22h 15m 17.2364s[1]
Declination −14° 02′ 59.3151″[1]
Apparent magnitude (V) 12.13
Characteristics
Evolutionary stage Main sequence
Spectral type K2
Astrometry
Radial velocity (Rv)6.5±0.8 km/s
Proper motion (μ) RA: 4.67±0.02[2] mas/yr
Dec.: -11.11±0.02[2] mas/yr
Parallax (π)5.4932 ± 0.0194[2] mas
Distance594 ± 2 ly
(182.0 ± 0.6 pc)
Details[3]
Mass0.858+0.022−0.027[4] M
Radius0.803+0.034−0.020[4] R
Surface gravity (log g)4.5 cgs
Temperature5038 K
Metallicity [Fe/H]0.25 dex
Rotational velocity (v sin i)2.2±0.5 km/s
Other designations
EPIC 206026904, 2MASS J22151722-1402593, Gaia DR2 2599975224481836672
Database references
SIMBADdata

K2-58 (also designated as EPIC 206026904) is G-type main-sequence star in the constellation of Aquarius, approximately 596 light-years from Solar System. The star is metal-rich, having 155% of Solar abundance of elements heavier than helium.[3] The star is located in the region allowing to see Venus transiting the Sun for hypothetical observer located in K2-58 system.[5]

Planetary system

The planetary system has three confirmed exoplanets (named as K2-58 b, K2-58 c, K2-58 d),[6][7][8] discovered in 2016.[9]

The K2-58 planetary system[9][4]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
K2-58c 0.0350 2.53726 86.1+2.8−7.3° 1.62 R
K2-58b 0.0692 7.05254 88.9+0.8−1.6° 2.68 R
K2-58d 0.1517 22.8827 89.43+0.41−0.81° 1.71 R

References

  1. 1.0 1.1 "K2-58". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=K2-58. 
  2. 2.0 2.1 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode2021A&A...649A...1G.  Gaia EDR3 record for this source at VizieR.
  3. 3.0 3.1 Brewer, John M.; Fischer, Debra A. (2018), "Spectral Properties of Cool Stars: Extended Abundance Analysis of Kepler Objects of Interest", The Astrophysical Journal Supplement Series 237 (2): 38, doi:10.3847/1538-4365/aad501, Bibcode2018ApJS..237...38B 
  4. 4.0 4.1 4.2 Mayo, Andrew W.; Vanderburg, Andrew; Latham, David W.; Bieryla, Allyson; Morton, Timothy D.; Buchhave, Lars A.; Dressing, Courtney D.; Beichman, Charles et al. (2018), "275 Candidates and 149 Validated Planets Orbiting Bright Stars inK2 Campaigns 0–10", The Astronomical Journal 155 (3): 136, doi:10.3847/1538-3881/aaadff, Bibcode2018AJ....155..136M 
  5. Kruse, Ethan; Agol, Eric; Luger, Rodrigo; Foreman-Mackey, Daniel (2019), "Detection of Hundreds of New Planet Candidates and Eclipsing Binaries in K2 Campaigns 0–8", The Astrophysical Journal Supplement Series 244 (1): 11, doi:10.3847/1538-4365/ab346b, Bibcode2019ApJS..244...11K 
  6. "Exoplanet-catalog". https://exoplanets.nasa.gov/exoplanet-catalog/3323/k2-58-c/. 
  7. "EPIC 206026904". https://www.cfa.harvard.edu/~avanderb/k2c3/ep206026904.html. 
  8. "Open Exoplanet Catalogue - K2-58 b". http://www.openexoplanetcatalogue.com/planet/K2-58%20b/. 
  9. 9.0 9.1 Crossfield, Ian J. M. et al. (2021), "197 CANDIDATES AND 104 VALIDATED PLANETS IN K2 's FIRST FIVE FIELDS", The Astrophysical Journal Supplement Series 226: 7, doi:10.3847/0067-0049/226/1/7