This page summarises the information held within TEPCat for the transiting system K2-189b. Please see here for descriptions of the quantities given below.
| Quantity | Value | Unit |
|---|---|---|
| Reference of discovery paper | 2018AJ....156..277L | |
| Date of discovery paper | 2018 / 10 / 10 | y / m / d |
| Data/telescope used for discovery | K2 | |
| Right ascension | 13 34 29.11 | h m s |
| Declination | −15 02 10.8 | d m s |
| Right ascension (decimal) | 203.62129 | degrees |
| Declination (decimal) | -15.03633 | degrees |
| V-band apparent magnitude | 12.06 | mag |
| K-band apparent magnitude | 10.59 | mag |
| Transit duration | 0.0924 ( 2.218 ) | day hour |
| Transit depth | 0.03 | % |
| Time of mid-transit | 2457222.14350 ± 0.00277 | HJD or BJD |
| Orbital period | 2.5883090 ± 0.0002210 | days |
| Reference for orbital ephemeris | 2018AJ....156..277L |
| Quantity | Value | Unit |
|---|---|---|
| Stellar effective temperature | 5519 ± 67 | K |
| Stellar metal abundance ([Fe/H] or [M/H]) | −0.00 ± 0.05 | dex |
| Stellar mass | 0.940 ± 0.030 | Msun |
| Stellar radius | 0.870 ± 0.010 | Rsun |
| Stellar logarithmic surface gravity | 4.530 ± 0.020 | c.g.s. |
| Stellar mean density | 1.006 +0.544 −0.399 ( 1.42 +0.77 −0.56 ) | ρsun g cm-3 |
| Orbital eccentricity | ||
| Orbital semimajor axis | 0.03610 ± 0.00040 | AU |
| Planetary mass | Mjup Mearth | |
| Planetary radius | 0.136 ± 0.008 ( 1.524 ± 0.090 ) | Rjup Rearth |
| Planetary surface gravity | m/s2 log(cgs) | |
| Planetary mean density | ρjup g cm-3 | |
| Planetary equilibrium temperature | 1197 ± 18 | K |
| Reference of detailed study | 2018AJ....156..277L |
K2-189b does not have an entry in the catalogue of orbital obliquity measurements.
Page generated on 2025/08/27 John Southworth (Keele University, UK)