This page summarises the information held within TEPCat for the transiting planetary system K2-138c. 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 | 0.0970 ( 2.328 ) | day hour |
| Transit depth | 0.05 | % |
| Time of mid-transit | 2457740.3217 ± 0.0003 | HJD or BJD |
| Orbital period | 3.559823 ± 0.000050 | days |
| Reference for orbital ephemeris | 2024A+A...688A.192V |
| Quantity | Value | Unit |
|---|---|---|
| Stellar effective temperature | 5350 ± 80 | K |
| Stellar metal abundance ([Fe/H] or [M/H]) | +0.14 ± 0.10 | dex |
| Stellar mass | 0.93 ± 0.02 | Msun |
| Stellar radius | 0.86 +0.03 −0.02 | Rsun |
| Stellar logarithmic surface gravity | 4.54 +0.02 −0.04 | c.g.s. |
| Stellar mean density | 1.46 +0.10 −0.19 ( 2.06 +0.14 −0.27 ) | ρsun g cm-3 |
| Orbital eccentricity | 0.0 +0.192 −0.0 | |
| Orbital semimajor axis | 0.04461 +0.00030 −0.00038 | AU |
| Planetary mass | 0.0198 +0.0035 −0.0038 ( 6.3 +1.1 −1.2 ) | Mjup Mearth |
| Planetary radius | 0.205 +0.011 −0.008 ( 2.298 +0.123 −0.090 ) | Rjup Rearth |
| Planetary surface gravity | m/s2 log(cgs) | |
| Planetary mean density | 2.10 +0.51 −0.46 ( 2.79 +0.68 −0.61 ) | ρjup g cm-3 |
| Planetary equilibrium temperature | 1140 +21 −17 | K |
| Reference of detailed study | 2019A+A...631A..90L |
K2-138c does not have an entry in the catalogue of orbital obliquity measurements.
Page generated on 2025/03/24 John Southworth (Keele University, UK)