Kepler-438 is a red dwarf in the constellation Lyra, about 640 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.
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Lyra |
Right ascension | 18h 46m 34.9970s[1] |
Declination | +41° 57′ 03.9233″[1] |
Apparent magnitude (V) | 15.0[2] |
Astrometry | |
Proper motion (μ) | RA: −16.762±0.282[1] mas/yr Dec.: −4.921±0.243[1] mas/yr |
Parallax (π) | 5.1035 ± 0.1232 mas[1] |
Distance | 640 ± 20 ly (196 ± 5 pc) |
Absolute magnitude (MV) | 9.55+0.54 −0.44[3] |
Details[3] | |
Mass | 0.544+0.061 −0.041 M☉ |
Radius | 0.52+0.061 −0.038 R☉ |
Luminosity | 0.044+0.017 −0.012 L☉ |
Surface gravity (log g) | 4.74 cgs |
Temperature | 3748±112 K |
Metallicity [Fe/H] | 0.16±0.14 dex |
Age | 4.4+0.7 −0.8 Gyr |
Other designations | |
Database references | |
SIMBAD | data |
KIC | data |
The system has one confirmed planet however transit timing observations of Kepler-438b indicate the possible presence of additional planets.[5]
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🜨 |
NASA's Kepler Marks 1,000th Exoplanet Discovery, Uncovers More Small Worlds in Habitable Zones
Constellation of Lyra | |||||||||||||
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Stars |
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