This page summarises the information held within TEPCat for the transiting system Kepler-257b. Please see here for descriptions of the quantities given below.
| Quantity | Value | Unit |
|---|---|---|
| Reference of discovery paper | 2014ApJ...784...45R | |
| Date of discovery paper | 2014 / 3 / 20 | y / m / d |
| Data/telescope used for discovery | Kepler | |
| Right ascension | 19 49 15.83 | h m s |
| Declination | +46 01 23.7 | d m s |
| Right ascension (decimal) | 297.31596 | degrees |
| Declination (decimal) | 46.02325 | degrees |
| V-band apparent magnitude | 15.74 | mag |
| K-band apparent magnitude | 13.37 | mag |
| Transit duration | 0.0755 ( 1.812 ) | day hour |
| Transit depth | 0.07 | % |
| Time of mid-transit | 2455003.66330 ± 0.00125 | HJD or BJD |
| Orbital period | 2.382667 ± 0.000006 | days |
| Reference for orbital ephemeris | 2014ApJ...784...45R |
| Quantity | Value | Unit |
|---|---|---|
| Stellar effective temperature | 5180 ± 200 | K |
| Stellar metal abundance ([Fe/H] or [M/H]) | 0.32 ± 0.50 | dex |
| Stellar mass | 0.898 | Msun |
| Stellar radius | 1.037 ± 0.518 | Rsun |
| Stellar logarithmic surface gravity | 4.360 ± 0.300 | c.g.s. |
| Stellar mean density | 1.136 ± 0.749 ( 1.6 ± 1.1 ) | ρsun g cm-3 |
| Orbital eccentricity | ||
| Orbital semimajor axis | AU | |
| Planetary mass | Mjup Mearth | |
| Planetary radius | 0.233 ± 0.117 ( 2.6 ± 1.3 ) | Rjup Rearth |
| Planetary surface gravity | m/s2 log(cgs) | |
| Planetary mean density | ρjup g cm-3 | |
| Planetary equilibrium temperature | K | |
| Reference of detailed study | 2014ApJ...784...45R |
Kepler-257b does not have an entry in the catalogue of orbital obliquity measurements.
Page generated on 2025/08/27 John Southworth (Keele University, UK)