Kepler-421
Yellow main-sequence star
From Wikipedia, the free encyclopedia
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.[4] The distance to star KOI-1274 A is approximately 1150 light-years, and to KOI-1274 B is about 1900 light-years.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lyra[1] |
| Right ascension | 18h 53m 01.6405s[2] |
| Declination | 45° 5′ 15.977″[2] |
| Apparent magnitude (V) | 13.56±0.04[3] |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | G7V or K9V[4] |
| Astrometry | |
| Proper motion (μ) | RA: −3.889(18) mas/yr[2] Dec.: −20.675(19) mas/yr[2] |
| Parallax (π) | 2.9019±0.0151 mas[2] |
| Distance | 1,124 ± 6 ly (345 ± 2 pc) |
| Details | |
| Mass | 0.76[5] M☉ |
| Radius | 0.83+0.04 −0.03[6] R☉ |
| Luminosity | 0.451[7] L☉ |
| Surface gravity (log g) | 4.54[5] cgs |
| Temperature | 5,308±50[3] K |
| Metallicity [Fe/H] | −0.25±0.08[3] dex |
| Rotation | 28.5±0.3 d[3] |
| Rotational velocity (v sin i) | 1.5±0.5[5] km/s |
| Age | 14.38[5] Gyr |
| Other designations | |
| KOI-1274, KIC 8800954, 2MASS J18530163+4505159, Gaia DR2 2106891671567353728[8] | |
| Database references | |
| SIMBAD | data |
| KIC | data |
Planetary system
Kepler-421 has an exoplanet (Kepler-421b), which is notable for its position near the snow line.[9]
| 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 |
