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 | 2459491.95470 ± 0.00087 | HJD or BJD |
| Orbital period | 15.388927 ± 0.000010 | days |
| Reference for orbital ephemeris | arXiv:2603.14552 |
| 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 | 0.021 +0.015 −0.017 | |
| Orbital semimajor axis | 0.1186 ± 0.0021 | AU |
| Planetary mass | 0.0236 ± 0.0047 ( 7.5 ± 1.5 ) | Mjup Mearth |
| Planetary radius | 0.2030 ± 0.0089 ( 2.275 ± 0.100 ) | Rjup Rearth |
| Planetary surface gravity | 14.2 ± 3.3 3.15 ± 0.09 | m/s2 log(cgs) |
| Planetary mean density | 2.8 +0.7 −0.6 ( 3.71 +0.93 −0.80 ) | ρjup g cm-3 |
| Planetary equilibrium temperature | 803 +24 −25 | K |
| Reference of detailed study | arXiv:2603.14552 |
K2-222 does not have an entry in the catalogue of orbital obliquity measurements.
Page generated on 2026/04/01 John Southworth (Keele University, UK)