This page summarises the information held within TEPCat for the transiting planetary system KELT-21. Please see here for descriptions of the quantities given below.
| Quantity | Value | Unit |
|---|---|---|
| Reference of discovery paper | arXiv:1712.03241 | |
| Date of discovery paper | 2017 / 12 / 12 | y / m / d |
| Right ascension | 20 19 12.00 | h m s |
| Declination | +32 34 51.8 | d m s |
| V-band apparent magnitude | 10.48 | mag |
| K-band apparent magnitude | 10.09 | mag |
| Transit duration | 0.17106 ( 4.1054 ) | day hour |
| Transit depth | 1.1 | % |
| Time of mid-transit | 2457382.64073 ± 0.00041 | HJD or BJD |
| Orbital period | 3.6127628 ± 0.0000028 | days |
| Reference for orbital ephemeris | arXiv:1712.03241 |
| Quantity | Value | Unit |
|---|---|---|
| Stellar effective temperature | 7598 +81 −84 | K |
| Stellar metal abundance ([Fe/H] or [M/H]) | −0.405 +0.032 −0.033 | dex |
| Stellar mass | 1.458 +0.029 −0.028 | Msun |
| Stellar radius | 1.638 ± 0.034 | Rsun |
| Stellar logarithmic surface gravity | 4.173 +0.015 −0.014 | c.g.s. |
| Stellar mean density | 0.332 +0.018 −0.017 ( 0.468 +0.025 −0.024 ) | ρsun g cm-3 |
| Orbital eccentricity | 0.0 | |
| Orbital semimajor axis | 0.05224 +0.00035 −0.00034 | AU |
| Planetary mass | 0.0 +3.9 −0.0 ( 0 +1239 −0 ) | Mjup Mearth |
| Planetary radius | 1.586 +0.039 −0.040 ( 17.78 + 0.44 − 0.45 ) | Rjup Rearth |
| Planetary surface gravity | 0.0 +38.9 −0.0 **0000000000000000000000000000000000000000000000000 +**0000000000000000000000000000000000000000000000000 −**0000000000000000000000000000000000000000000000000 | m/s2 log(cgs) |
| Planetary mean density | 0.0 +0.93 −0.0 ( 0.0 +1.2 −0.0 ) | ρjup g cm-3 |
| Planetary equilibrium temperature | 2051 +29 −30 | K |
| Reference of detailed study | arXiv:1712.03241 |
| Reference | λ (degrees) |
|---|---|
| Johnson et al. (2017) | −5.6 + 1.7 - 1.9 |
KELT-21 has not been analysed as part of the Homogeneous Studies of Transiting Extrasolar Planets project.
Page generated on 2021/01/04 John Southworth (Keele University, UK)