Kepler-438 is a red dwarf in the constellation Lyra, about 590 light years from Earth.[1] It is notable for its planetary system, which includes Kepler-438b, a possibly Earth-size planet within Kepler-438's habitable zone.

Kepler-438
Observation data
Epoch J2000      Equinox J2000
Constellation Lyra
Right ascension 18h 46m 34.9968s[1]
Declination +41° 57′ 03.934″[1]
Apparent magnitude (V) 15.0[2]
Astrometry
Proper motion (μ) RA: −16.649(115) mas/yr[1]
Dec.: −5.614(111) mas/yr[1]
Parallax (π)5.5592 ± 0.0984 mas[1]
Distance590 ± 10 ly
(180 ± 3 pc)
Absolute magnitude (MV)9.55+0.54
−0.44
[3]
Details[3]
Mass0.544+0.061
−0.041
 M
Radius0.52+0.061
−0.038
 R
Luminosity0.044+0.017
−0.012
 L
Surface gravity (log g)4.74 cgs
Temperature3748±112 K
Metallicity [Fe/H]0.16±0.14 dex
Age4.4+0.7
−0.8
 Gyr
Other designations
KIC 6497146, KOI-3284, 2MASS J18463499+4157039[4]
Database references
SIMBADdata
KICdata

Planetary system

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The system has one confirmed planet however transit timing observations of Kepler-438b indicate the possible presence of additional planets.[5]

The Kepler-438 planetary system[3][2]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b 0.166 +0.051
−0.042
35.23319 +0.00025
−0.00029
0.03 +0.10
−0.03
89.86 +0.14
−0.32
°
1.12 +0.16
−0.17
 R🜨

References

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  1. ^ a b c d e 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.
  2. ^ a b "Notes on Kepler-438 b". Extrasolar Planets Encyclopaedia. Retrieved 21 January 2017.
  3. ^ a b c Torres, Guillermo; et al. (2015). "Validation of Twelve Small Kepler Transiting Planets in the Habitable Zone". American Astronomical Society. 225: 438.02. arXiv:1501.01101. Bibcode:2015AAS...22543802C. doi:10.1088/0004-637X/800/2/99. S2CID 8512655.
  4. ^ "KOI-3284". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 21 January 2017.
  5. ^ Kipping, D. M.; et al. (2014). "The Hunt for Exomoons with Kepler (HEK). IV. A Search for Moons around Eight M Dwarfs". The Astrophysical Journal. 784 (1). 28. arXiv:1401.1210. Bibcode:2014ApJ...784...28K. doi:10.1088/0004-637X/784/1/28.
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NASA's Kepler Marks 1,000th Exoplanet Discovery, Uncovers More Small Worlds in Habitable Zones