| The Star | |||||
|---|---|---|---|---|---|
| Simbad GAIA 2MASS |
K2-18 DR2 3910747531814692736 J11301450+0735180 |
||||
| RA | 11:30:14.5177 | DEC | +07:35:18.255 | ||
| Parallax 26.269 mas |
P.M. RA -80.377 mas/y |
P.M. DEC -133.142 mas/y |
|||
| MagV 13.5 |
MagR 13.24 |
MagI* 11.166 |
MagJ 9.763 |
MagH 9.135 |
MagK 8.899 |
| MagG 12.415 |
MagGBP 13.733 |
MagGRP 11.291 |
|||
| *Calculated from GAIA magnitudes. | |||||
Ephemeris
- Verified 
|
|||||
|---|---|---|---|---|---|
| Kokori et al. 2025 | |||||
| Mid-time 2457692.61141 ± 0.00017 BJDTDB |
|||||
| Period 32.940065 ± 2.5e-05 days |
|||||
| Transit Parameters | |||||
| Benneke et al. 2017 | |||||
| Rp/Rs 0.05295 ± 0.00061 |
a/Rs 81.8 +3.1 -3.4 |
i 89.579 +0.008 -0.009 deg |
|||
| e - |
ω - deg |
||||
| DepthR* 3.38 mmag |
Duration* 2.66 hours |
||||
|
*Calculated from the other parameters, using PyLightcurve.
**Adjusted based on the space observations. |
|||||
| Limb Darkening Parameters | |||||
| Montet et al. 2015 | |||||
| Teff 3503.0 +60.0 -60.0 K |
Log(g) 4.868405205487125 +0.09864865511848639 -0.09864865511848639 cm/s2 |
Fe/H 0.09 +0.09 -0.09 dex |
|||
| ExoClock Status | |||||
|---|---|---|---|---|---|
| Observing Priority | HIGH | ||||
| Minimum aperture | 33.35" | ||||
| Total Observations (Recent) | 13 (0) | ||||
| O-C | - | ||||
| ExoClock Observations (Recent) | 0 (0) | ||||
| Space Observations (Recent) | 4 (0) | ||||
| ETD Observations (Recent) | 0 (0) | ||||
| Literature Mid-times (Recent) | 9 (0) | ||||
| Kepler Rp/Rs | 0.0443 ± 0.0016 | ||||
| TESS Rp/Rs | 0.0499 ± 0.0031 | ||||
Space Observations |
||||
| Planet Observation Date |
Mission | O-C minutes |
||
|---|---|---|---|---|
| K2-18b (HIGH) 2021-12-21 | TESS | -8.81 ± 3.31 | ||
| K2-18b (HIGH) 2021-11-18 | TESS | -2.81 ± 4.9 | ||
| K2-18b (HIGH) 2014-07-30 | K2 | 0.02 ± 3.02 | ||
| K2-18b (HIGH) 2014-06-27 | K2 | -4.06 ± 5.33 | ||
Literature Mid-times |
||||
| Planet Observation Date |
Reference | O-C minutes |
||
| 2017-11-30 | Tsiaras et al. 2019 | -0.27 ± 0.43 | ||
| 2017-04-13 | Tsiaras et al. 2019 | 0.7 ± 0.23 | ||
| 2017-02-06 | Tsiaras et al. 2019 | 1.0 ± 0.58 | ||
| 2017-01-04 | Tsiaras et al. 2019 | -0.84 ± 0.3 | ||
| 2016-12-03 | Tsiaras et al. 2019 | -0.4 ± 0.43 | ||
| 2016-05-19 | Tsiaras et al. 2019 | 0.6 ± 0.29 | ||
| 2016-03-14 | Tsiaras et al. 2019 | -1.39 ± 0.33 | ||
| 2015-12-06 | Tsiaras et al. 2019 | 0.2 ± 0.43 | ||
| 2015-08-29 | Benneke et al. 2017 | 1.2 ± 0.86 | ||