This page summarises the information held within TEPCat for the transiting planetary system K2-21b. Please see here for descriptions of the quantities given below.
Quantity | Value | Unit |
---|---|---|
Reference of discovery paper | 2015ApJ...811..102P | |
Date of discovery paper | 2015 / 7 / 30 | y / m / d |
Data/telescope used for discovery | K2 | |
Right ascension | 22 41 12.89 | h m s |
Declination | −14 29 20.4 | d m s |
Right ascension (decimal) | 340.30371 | degrees |
Declination (decimal) | -14.48900 | degrees |
V-band apparent magnitude | 12.85 | mag |
K-band apparent magnitude | 9.42 | mag |
Transit duration | 0.096 ( 2.30 ) | day hour |
Transit depth | 0.07 | % |
Time of mid-transit | 2456989.4239 ± 0.0023 | HJD or BJD |
Orbital period | 9.32414 ± 0.00061 | days |
Reference for orbital ephemeris | 2015ApJ...811..102P |
Quantity | Value | Unit |
---|---|---|
Stellar effective temperature | 4043 ± 375 | K |
Stellar metal abundance ([Fe/H] or [M/H]) | −0.11 ± 0.13 | dex |
Stellar mass | 0.64 ± 0.11 | Msun |
Stellar radius | 0.60 ± 0.10 | Rsun |
Stellar logarithmic surface gravity | c.g.s. | |
Stellar mean density | ρsun g cm-3 | |
Orbital eccentricity | ||
Orbital semimajor axis | 0.0731 +0.0057 −0.0067 | AU |
Planetary mass | 0.0050 +0.0016 −0.0014 ( 1.59 +0.51 −0.45 ) | Mjup Mearth |
Planetary radius | 0.142 +0.037 −0.039 ( 1.59 +0.41 −0.44 ) | Rjup Rearth |
Planetary surface gravity | m/s2 log(cgs) | |
Planetary mean density | 0.91 +0.21 −0.170 ( 1.21 +0.28 −0.23 ) | ρjup g cm-3 |
Planetary equilibrium temperature | 500 | K |
Reference of detailed study | 2023MNRAS.520.4226M |
K2-21b does not have an entry in the catalogue of orbital obliquity measurements.
Page generated on 2024/11/01 John Southworth (Keele University, UK)