| 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 |
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.
Planetary system
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🜨 |
References
- 1 2 3 4 5 6 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.
- 1 2 "Notes on Kepler-438 b". Extrasolar Planets Encyclopaedia. Retrieved 21 January 2017.
- 1 2 3 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.
- ↑ "KOI-3284". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 21 January 2017.
- ↑ 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.
External links
NASA's Kepler Marks 1,000th Exoplanet Discovery, Uncovers More Small Worlds in Habitable Zones
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