This page summarises the information held within TEPCat for the transiting planetary system K2-28. Please see here for descriptions of the quantities given below.
| Quantity | Value | Unit |
|---|---|---|
| Reference of discovery paper | 2016ApJ...820...41H | |
| Date of discovery paper | 2015 / 11 / 30 | y / m / d |
| Data/telescope used for discovery | K2 | |
| Right ascension | 22 22 29.85 | h m s |
| Declination | −07 57 19.3 | d m s |
| Right ascension (decimal) | 335.62438 | degrees |
| Declination (decimal) | -7.95536 | degrees |
| V-band apparent magnitude | 16.06 | mag |
| K-band apparent magnitude | 10.75 | mag |
| Transit duration | 0.04 ( 1.0 ) | day hour |
| Transit depth | 0.06 | % |
| Time of mid-transit | 2457931.89780 ± 0.00037 | HJD or BJD |
| Orbital period | 2.2604455 ± 0.0000010 | days |
| Reference for orbital ephemeris | 2018AJ....156..266S |
| Quantity | Value | Unit |
|---|---|---|
| Stellar effective temperature | 3214 ± 60 | K |
| Stellar metal abundance ([Fe/H] or [M/H]) | +0.26 ± 0.05 | dex |
| Stellar mass | 0.257 ± 0.048 | Msun |
| Stellar radius | 0.288 ± 0.028 | Rsun |
| Stellar logarithmic surface gravity | 4.93 ± 0.04 | c.g.s. |
| Stellar mean density | 10.4 ± 2.8 ( 14.7 ± 4.0 ) | ρsun g cm-3 |
| Orbital eccentricity | 0.0 | |
| Orbital semimajor axis | 0.0191 +0.0037 −0.0029 | AU |
| Planetary mass | Mjup Mearth | |
| Planetary radius | 0.229 ± 0.024 ( 2.57 ± 0.27 ) | Rjup Rearth |
| Planetary surface gravity | m/s2 log(cgs) | |
| Planetary mean density | ρjup g cm-3 | |
| Planetary equilibrium temperature | 421 +29 −32 | K |
| Reference of detailed study | 2018AJ....156..266S |
K2-28 does not have an entry in the catalogue of orbital obliquity measurements.
Page generated on 2025/03/24 John Southworth (Keele University, UK)