This page summarises the information held within TEPCat for the transiting planetary system K2-222. Please see here for descriptions of the quantities given below.
| Quantity | Value | Unit |
|---|---|---|
| Reference of discovery paper | 2018AJ....155..136M | |
| Date of discovery paper | 2018 / 2 / 14 | y / m / d |
| Data/telescope used for discovery | K2 | |
| Right ascension | 01 05 50.95 | h m s |
| Declination | +11 45 12.3 | d m s |
| Right ascension (decimal) | 16.46229 | degrees |
| Declination (decimal) | 11.75342 | degrees |
| V-band apparent magnitude | 9.54 | mag |
| K-band apparent magnitude | 8.11 | mag |
| Transit duration | 0.1836 ( 4.406 ) | day hour |
| Transit depth | 0.04 | % |
| Time of mid-transit | 2457399.0595 ± 0.0016 | HJD or BJD |
| Orbital period | 15.38857 ± 0.00088 | days |
| Reference for orbital ephemeris | 2022AJ....163...41N |
| Quantity | Value | Unit |
|---|---|---|
| Stellar effective temperature | 5942 ± 119 | K |
| Stellar metal abundance ([Fe/H] or [M/H]) | −0.315 ± 0.06 | dex |
| Stellar mass | 0.94 ± 0.05 | Msun |
| Stellar radius | 1.072 ± 0.043 | Rsun |
| Stellar logarithmic surface gravity | 4.35 ± 0.02 | c.g.s. |
| Stellar mean density | 0.76 +0.05 −0.04 ( 1.072 +0.071 −0.056 ) | ρsun g cm-3 |
| Orbital eccentricity | 0.16 +0.09 −0.10 | |
| Orbital semimajor axis | AU | |
| Planetary mass | 0.025 ± 0.006 ( 7.9 ± 1.9 ) | Mjup Mearth |
| Planetary radius | 0.210 +0.007 −0.006 ( 2.354 +0.078 −0.067 ) | Rjup Rearth |
| Planetary surface gravity | 14.2 ± 3.3 3.15 ± 0.09 | m/s2 log(cgs) |
| Planetary mean density | 2.6 ± 0.6 ( 3.45 ± 0.80 ) | ρjup g cm-3 |
| Planetary equilibrium temperature | 878 +17 −16 | K |
| Reference of detailed study | 2022AJ....163...41N |
K2-222 does not have an entry in the catalogue of orbital obliquity measurements.
Page generated on 2025/11/11 John Southworth (Keele University, UK)