This page summarises the information held within TEPCat for the transiting planetary system Kepler-138d. Please see here for descriptions of the quantities given below.
| Quantity | Value | Unit |
|---|---|---|
| Reference of discovery paper | 2014ApJ...784...28K | |
| Date of discovery paper | 2014 / 3 / 20 | y / m / d |
| Data/telescope used for discovery | Kepler | |
| Right ascension | 19 21 31.56 | h m s |
| Declination | +43 17 34.8 | d m s |
| Right ascension (decimal) | 290.38150 | degrees |
| Declination (decimal) | 43.29300 | degrees |
| V-band apparent magnitude | 13.34 | mag |
| K-band apparent magnitude | 9.51 | mag |
| Transit duration | 0.0750 ( 1.800 ) | day hour |
| Transit depth | 0.07 | % |
| Time of mid-transit | 2454957.8160 ± 0.0009 | HJD or BJD |
| Orbital period | 23.0923 ± 0.0006 | days |
| Reference for orbital ephemeris | 2023NatAs...7..206P |
| Quantity | Value | Unit |
|---|---|---|
| Stellar effective temperature | 3841 +50 −51 | K |
| Stellar metal abundance ([Fe/H] or [M/H]) | −0.18 ± 0.10 | dex |
| Stellar mass | 0.535 ± 0.012 | Msun |
| Stellar radius | 0.535 +0.013 −0.014 | Rsun |
| Stellar logarithmic surface gravity | 4.71 ± 0.03 | c.g.s. |
| Stellar mean density | 3.5 ± 0.3 ( 4.94 ± 0.42 ) | ρsun g cm-3 |
| Orbital eccentricity | 0.010 ± 0.005 | |
| Orbital semimajor axis | 0.1288 ± 0.0010 | AU |
| Planetary mass | 0.0066 +0.0019 −0.0022 ( 2.10 +0.60 −0.70 ) | Mjup Mearth |
| Planetary radius | 0.135 ± 0.004 ( 1.513 ± 0.045 ) | Rjup Rearth |
| Planetary surface gravity | 9.8 +2.8 −2.9 3.0 +0.1 −0.2 | m/s2 log(cgs) |
| Planetary mean density | 2.7 ± 0.8 ( 3.6 ± 1.1 ) | ρjup g cm-3 |
| Planetary equilibrium temperature | 345 ± 7 | K |
| Reference of detailed study | 2023NatAs...7..206P |
Kepler-138d does not have an entry in the catalogue of orbital obliquity measurements.
Page generated on 2025/03/17 John Southworth (Keele University, UK)