Kepler-1625
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 19h 41m 43.0402s[1] |
| Declination | 39° 53′ 11.4990″[1] |
| Characteristics | |
| Apparent magnitude (K) | 13.916[2] |
| Astrometry | |
| Proper motion (μ) | RA: −2.145±0.064[1] mas/yr Dec.: −4.799±0.068[1] mas/yr |
| Parallax (π) | 0.4065 ± 0.0358[1] mas |
| Distance | 8,000 ± 700 ly (2,500 ± 200 pc) |
| Details | |
| Mass | 1.04±0.08[3] M☉ |
| Radius | 1.73±0.24[3] R☉ |
| Luminosity (bolometric) | 2.57±0.68[3] L☉ |
| Surface gravity (log g) | 3.99±0.10[3] cgs |
| Temperature | 5563±86[3] K |
| Metallicity [Fe/H] | 0.06±0.13[3] dex |
| Age | 8.7±2.1[3] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| [5][6] | |
Kepler-1625 is a 14th-magnitude solar-mass star located in the constellation of Cygnus approximately 8,000 light years away. Its mass is within 5% of that of the Sun, but its radius is approximately 70% larger reflecting its more evolved state. A candidate gas giant exoplanet was detected by the Kepler Mission around the star in 2015,[7] which was later validated as a likely real planet to >99% confidence in 2016.[8] In 2018, the Hunt for Exomoons with Kepler project reported that this exoplanet has evidence for a Neptune-sized exomoon around it, based on observations from NASA’s Kepler Mission.[9] Subsequent observations by the larger Hubble Space Telescope provided compounding evidence for a Neptune-sized satellite, with an on-going debate about the reality of this exomoon candidate.[10][11][12]
Stellar characteristics[]
Kepler-1625 is an approximately solar-mass star and yet is 1.7 times larger in diameter.[3] Its effective temperature is around 5,550 K, slightly lower than that of the Sun.[13][3] These parameters suggest that Kepler-1625 may be a yellow subgiant nearing the end of its life, with an age of approximately 8.7 billion years.[3] The star has been observed to be photometrically quiet, with periodic variability below 0.02%.[12] Kepler-1625 is located approximately 8,000 light-years away[1] in the constellation Cygnus.[13]
Planetary system[]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≤11.6[14] MJ | 0.98±0.14 | 287.3727±0.0022 | — | 89.97±0.02° | 11.4±1.6 R
|