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.
| 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] |
| Distance | 590 ± 10 ly (180 ± 3 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 |
Planetary system
editThe 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
edit- ^ 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.
- ^ a b "Notes on Kepler-438 b". Extrasolar Planets Encyclopaedia. Retrieved 21 January 2017.
- ^ 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.
- ^ "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
editNASA's Kepler Marks 1,000th Exoplanet Discovery, Uncovers More Small Worlds in Habitable Zones
 | This article about a red dwarf is a stub. You can help Wikipedia by expanding it. |