Kepler-385
F-type main-sequence star in the constellation Cygnus
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Kepler-385 (also designated KOI-2433) is an F-type main-sequence star located about 4,900 light-years (1,500 parsecs) away from Earth in the constellation of Cygnus. The star is 10% larger and 5% hotter than the Sun. The star has at least three, and potentially up to seven, exoplanets discovered orbiting it.[7][8]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cygnus[1] |
| Right ascension | 19h 37m 21.23819s[2] |
| Declination | +50° 20′ 11.5477″[2] |
| Apparent magnitude (V) | 15.76[3] |
| Astrometry | |
| Proper motion (μ) | RA: 2.738 mas/yr[2] Dec.: -5.398 mas/yr[2] |
| Parallax (π) | 0.6597±0.0183 mas[2] |
| Distance | 4,900 ± 100 ly (1,520 ± 40 pc) |
| Details | |
| Mass | 0.99±0.03[4] M☉ |
| Radius | 1.09±0.05[4] R☉ |
| Luminosity | 1.5[2] L☉ |
| Surface gravity (log g) | 4.19±0.10[4] cgs |
| Temperature | 5835±64[4] K |
| Metallicity [Fe/H] | 0.010±0.037[4] dex |
| Rotation | 25.11 days[5] |
| Rotational velocity (v sin i) | 2.80[5] km/s |
| Age | 7.6[5] Gyr |
| Other designations | |
| Kepler-385, KOI-2433, KIC 11968463, TIC 27082352, 2MASS J19372123+5020115[6] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
The star has a mass of 1.05 solar masses, a radius of 1.157 solar radii, a temperature of 5829 Kelvin and a luminosity of 1.39 times the solar luminosity.[3]
Planetary system
Kepler-385 was observed by the Kepler space telescope, which initially detected a total of seven planet candidates. Two of these, KOI-2433.01 & .02, were confirmed in 2014 as Kepler-385 b & c,[9] and a third, KOI-2433.03, was confirmed in 2020 as Kepler-385 d.[10] These confirmations were part of studies using statistical validation to confirm large numbers of Kepler candidates. The candidate KOI-2433.05 was shown to be a false positive.[4]
In 2023, a new updated catalog of Kepler candidates was presented, including an eighth candidate around Kepler-385, KOI-2433.08, making it a candidate seven-planet system.[4][7] Kepler-385 is tied with Kepler-90 - a confirmed eight-planet system - as the Kepler system with the most planet candidates.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| .08 (unconfirmed) | — | — | 3.37376±0.00003 | — | — | 1.206+0.110 −0.101 R🜨 |
| .06 (unconfirmed) | — | 0.067 | 6.06325±0.00006 | — | — | 1.441+0.129 −0.106 R🜨 |
| b | — | 0.097 | 10.04381±0.00008 | — | — | 2.313+0.210 −0.162 R🜨 |
| c | — | 0.127 | 15.16213±0.00014 | — | — | 2.406+0.549 −0.146 R🜨 |
| .04 (unconfirmed) | — | 0.189 | 27.90426±0.00040 | — | — | 1.903+0.184 −0.142 R🜨 |
| d | — | 0.302 | 56.41581±0.00135 | — | — | 2.423+0.210 −0.161 R🜨 |
| .07 (unconfirmed) | — | 0.402 | 86.43086±0.00205 | — | — | 2.252±0.199 R🜨 |