This page summarises the information held within TEPCat for the transiting planetary system K2-138f. Please see here for descriptions of the quantities given below.
| Quantity | Value | Unit |
|---|---|---|
| Reference of discovery paper | 2018AJ....155...57C | |
| Date of discovery paper | 2018 / 1 / 12 | y / m / d |
| Data/telescope used for discovery | K2 | |
| Right ascension | 23 15 47.77 | h m s |
| Declination | −10 50 58.9 | d m s |
| Right ascension (decimal) | 348.94904 | degrees |
| Declination (decimal) | -10.84969 | degrees |
| V-band apparent magnitude | 12.21 | mag |
| K-band apparent magnitude | 10.31 | mag |
| Transit duration | 0.133 ( 3.19 ) | day hour |
| Transit depth | 0.08 | % |
| Time of mid-transit | 2457738.7053 ± 0.0051 | HJD or BJD |
| Orbital period | 12.756618 ± 0.000061 | days |
| Reference for orbital ephemeris | 2024A+A...688A.192V |
| Quantity | Value | Unit |
|---|---|---|
| Stellar effective temperature | 5275 ± 67 | K |
| Stellar metal abundance ([Fe/H] or [M/H]) | +0.06 ± 0.05 | dex |
| Stellar mass | 0.862 ± 0.034 | Msun |
| Stellar radius | 0.845 ± 0.006 | Rsun |
| Stellar logarithmic surface gravity | 4.51 ± 0.03 | c.g.s. |
| Stellar mean density | 1.429 ± 0.064 ( 2.016 ± 0.090 ) | ρsun g cm-3 |
| Orbital eccentricity | 0.0014 +0.0017 −0.0009 | |
| Orbital semimajor axis | 0.10447 +0.00070 −0.00088 | AU |
| Planetary mass | 0.0181 +0.0021 −0.0019 ( 5.75 +0.67 −0.60 ) | Mjup Mearth |
| Planetary radius | 0.2535 +0.0047 −0.0054 ( 2.841 +0.053 −0.061 ) | Rjup Rearth |
| Planetary surface gravity | m/s2 | |
| Planetary mean density | 1.05 +0.14 −0.13 ( 1.39 +0.19 −0.17 ) | ρjup g cm-3 |
| Planetary equilibrium temperature | 745 +14 −11 | K |
| Reference of detailed study | 2026A+A...711A.221L |
K2-138f does not have an entry in the catalogue of orbital obliquity measurements.
Page generated on 2026/10/04 John Southworth (Keele University, UK)