| The Star | |||||
|---|---|---|---|---|---|
| Simbad GAIA 2MASS |
K2-21 DR2 2596888100773300224 J22411288-1429202 |
||||
| RA | 22:41:12.8862 | DEC | -14:29:20.349 | ||
| Parallax 11.927 mas |
P.M. RA 20.736 mas/y |
P.M. DEC -78.905 mas/y |
|||
| MagV 12.85 |
MagR* 12.018 |
MagI* 11.321 |
MagJ 10.251 |
MagH 9.633 |
MagK 9.417 |
| MagG 12.278 |
MagGBP 13.103 |
MagGRP 11.401 |
|||
| *Calculated from GAIA magnitudes. | |||||
Ephemeris
- Verified 
|
|||||
|---|---|---|---|---|---|
| Kokori et al. 2025 | |||||
| Mid-time 2457608.4506 ± 0.004 BJDTDB |
|||||
| Period 15.499471 ± 9.8e-05 days |
|||||
| Transit Parameters | |||||
| Dressing et al. 2017 | |||||
| Rp/Rs 0.03533 ± 0.00174 |
a/Rs 35.5 +1.6 -1.6 |
i 88.85 +0.4 -0.15 deg |
|||
| e 0.21 +0.20677 -0.173719 |
ω 59.96 +75.6752 -120.5778 deg |
||||
| DepthR* 1.52 mmag |
Duration* 2.37 hours |
||||
|
*Calculated from the other parameters, using PyLightcurve.
**Adjusted based on the space observations. |
|||||
| Limb Darkening Parameters | |||||
| Petigura et al. 2015 | |||||
| Teff 4043.0 +375.0 -375.0 K |
Log(g) 4.687628036036988 +0.16287613794534334 -0.16287613794534334 cm/s2 |
Fe/H -0.11 +0.13 -0.13 dex |
|||
| ExoClock Status | |||||
|---|---|---|---|---|---|
| Observing Priority | HIGH | ||||
| Minimum aperture | 50.79" | ||||
| Total Observations (Recent) | 9 (0) | ||||
| O-C | - | ||||
| ExoClock Observations (Recent) | 0 (0) | ||||
| Space Observations (Recent) | 4 (0) | ||||
| ETD Observations (Recent) | 0 (0) | ||||
| Literature Mid-times (Recent) | 5 (0) | ||||
| Kepler Rp/Rs | 0.03555 ± 0.00086 | ||||
| TESS Rp/Rs | - | ||||
Space Observations |
||||
| Planet Observation Date |
Mission | O-C minutes |
||
|---|---|---|---|---|
| K2-21c (HIGH) 2015-01-12 | K2 | 5.37 ± 5.18 | ||
| K2-21c (HIGH) 2014-12-27 | K2 | 5.04 ± 2.88 | ||
| K2-21c (HIGH) 2014-12-12 | K2 | 2.26 ± 2.74 | ||
| K2-21c (HIGH) 2014-11-26 | K2 | -0.37 ± 2.59 | ||
Literature Mid-times |
||||
| Planet Observation Date |
Reference | O-C minutes |
||
| 2019-09-28 | El Moutamid et al. 2023 | -18.06 ± 2.56 | ||
| 2018-03-04 | El Moutamid et al. 2023 | 28.8 ± 2.12 | ||
| 2017-02-25 | El Moutamid et al. 2023 | -20.19 ± 3.89 | ||
| 2016-09-07 | El Moutamid et al. 2023 | -29.72 ± 4.03 | ||
| 2016-02-03 | El Moutamid et al. 2023 | -7.41 ± 2.17 | ||