This page summarises the information held within TEPCat for the transiting planetary system K2-138d. 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 | 0.124 ( 2.98 ) | day hour |
| Transit depth | 0.08 | % |
| Time of mid-transit | 2458791.7962 ± 0.0054 | HJD or BJD |
| Orbital period | 5.405362 ± 0.000038 | 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 +0.144 −0.0 | |
| Orbital semimajor axis | 0.05893 +0.00040 −0.00050 | AU |
| Planetary mass | 0.0249 +0.0044 −0.0041 ( 7.9 +1.4 −1.3 ) | Mjup Mearth |
| Planetary radius | 0.213 +0.009 −0.007 ( 2.388 +0.101 −0.078 ) | Rjup Rearth |
| Planetary surface gravity | m/s2 log(cgs) | |
| Planetary mean density | 2.37 +0.52 −0.45 ( 3.14 +0.69 −0.60 ) | ρjup g cm-3 |
| Planetary equilibrium temperature | 992 +18 −15 | K |
| Reference of detailed study | 2019A+A...631A..90L |
K2-138d does not have an entry in the catalogue of orbital obliquity measurements.
Page generated on 2024/09/10 John Southworth (Keele University, UK)