Kepler-421
Observation data
Epoch J2000      Equinox J2000
Constellation Lyra
Right ascension 18h 53m 01.6406s[1]
Declination 45° 5′ 15.9725″[1]
Apparent magnitude (V) 13.56±0.04[2]
Characteristics
Evolutionary stage main sequence
Spectral type G7V or K9V[3]
Astrometry
Proper motion (μ) RA: −4.010±0.032[1] mas/yr
Dec.: −20.398±0.037[1] mas/yr
Parallax (π)2.8401 ± 0.0166 mas[1]
Distance1,148 ± 7 ly
(352 ± 2 pc)
Details
Mass0.76[4] M☉
Radius0.83+0.04
−0.03[5] R☉
Luminosity0.451[1] L☉
Surface gravity (log g)4.54[4] cgs
Temperature5,308±50[2] K
Metallicity [Fe/H]−0.25±0.08[2] dex
Rotation28.5±0.3 d[2]
Rotational velocity (v sin i)1.5±0.5[4] km/s
Age14.38[4] Gyr
Other designations
Gaia DR2 2106891671567353728, KOI-1274, KIC 8800954, 2MASS J18530163+4505159[6]
Database references
SIMBADdata
KICdata

Kepler-421 (KOI-1274 A) is a yellow main sequence star, being of spectral class G7V. Orange star of spectral class K9V (KOI-1274 B), projected on sky plane just 1.085″ away, is not physically associated to it.[3] The distance to star KOI-1274 A is approximately 1150 light-years, and to KOI-1274 B is about 1900 light-years.

Planetary system

Kepler-421 has an exoplanet (Kepler-421b), which is notable for its position near the snow line.[7]

The Kepler-421 planetary system[5][8]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b — 1.219+0.089
−0.106 		704.20±0.01 0.041+0.095
−0.034 		89.965+0.024
−0.031° 		0.411+0.021
−0.016 RJ

References

  1. ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. ^ a b c d Kipping, D. M.; Torres, G.; Buchhave, L. A.; Kenyon, S. J.; Henze, C.; Isaacson, H.; Kolbl, R.; Marcy, G. W.; Bryson, S. T.; Stassun, K.; Bastien, F. (9 October 2014). "Discovery of a Transiting Planet Near the Snow-Line". The Astrophysical Journal. 795 (1): 25. arXiv:1407.4807. Bibcode:2014ApJ...795...25K. doi:10.1088/0004-637X/795/1/25. S2CID 119240746.
  3. ^ a b Atkinson, Dani; Baranec, Christoph; Ziegler, Carl; Law, Nicholas; Riddle, Reed; Morton, Tim (2016), "Probability of the Physical Association of 104 Blended Companions To Kepler Objects of Interest Using Visible and Near-Infrared Adaptive Optics Photometry", The Astronomical Journal, 153: 25, arXiv:1609.09512, doi:10.3847/1538-3881/153/1/25, S2CID 119307017
  4. ^ a b c d 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. arXiv:1804.00673. Bibcode:2018ApJS..237...38B. doi:10.3847/1538-4365/aad501. S2CID 119431797.
  5. ^ a b Herman, Miranda K.; Zhu, Wei; Wu, Yanqin (2019), "Revisiting the Long-period Transiting Planets from Kepler", The Astronomical Journal, 157 (6): 248, arXiv:1901.01974, Bibcode:2019AJ....157..248H, doi:10.3847/1538-3881/ab1f70, S2CID 119550672
  6. ^ "Kepler-421". SIMBAD. Centre de données astronomiques de Strasbourg.
  7. ^ Kawahara, Hajime; Masuda, Kento (2019), "Transiting Planets near the Snow Line from Kepler. I. Catalog", The Astronomical Journal, 157 (6): 218, arXiv:1904.04980, Bibcode:2019AJ....157..218K, doi:10.3847/1538-3881/ab18ab, S2CID 119099510
  8. ^ Planet Kepler-421 b at exoplanets.eu


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