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F-type main-sequence star in the constellation Cygnus From Wikipedia, the free encyclopedia
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.[6][7]
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[4] | |
Mass | 0.99±0.03 M☉ |
Radius | 1.09±0.05 R☉ |
Surface gravity (log g) | 4.19±0.10 cgs |
Temperature | 5835±64 K |
Metallicity [Fe/H] | 0.010±0.037 dex |
Other designations | |
Database references | |
SIMBAD | 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]
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,[8] and a third, KOI-2433.03, was confirmed in 2020 as Kepler-385 d.[9] 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][6] 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🜨 |
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