| The Star | |||||
|---|---|---|---|---|---|
| Simbad GAIA 2MASS |
CD-23 12854 DR2 6050191241556876672 J16214578-2332520 |
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| RA | 16:21:45.7780 | DEC | -23:32:52.289 | ||
| Parallax 9.019 mas |
P.M. RA -40.23 mas/y |
P.M. DEC -96.332 mas/y |
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| MagV 10.8 |
MagR* 10.292 |
MagI* 9.941 |
MagJ 9.318 |
MagH 8.942 |
MagK 8.866 |
| MagG 10.537 |
MagGBP 10.967 |
MagGRP 9.974 |
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| *Calculated from GAIA magnitudes. | |||||
Ephemeris
- Verified 
|
|||||
|---|---|---|---|---|---|
| Kokori et al. 2025 | |||||
| Mid-time 2456952.71787 ± 6.4e-05 BJDTDB |
|||||
| Period 1.25784901 ± 3.6e-07 days |
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| Transit Parameters | |||||
| Grziwa et al. 2016 | |||||
| Rp/Rs** 0.13748 ± 0.00015 |
a/Rs** 5.642 +0.007 -0.007 |
i 79.9 +0.8 -0.8 deg |
|||
| e - |
ω - deg |
||||
| DepthR* 7.96 mmag |
Duration* 0.97 hours |
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|
*Calculated from the other parameters, using PyLightcurve.
**Adjusted based on the space observations. |
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| Limb Darkening Parameters | |||||
| Grziwa et al. 2016 | |||||
| Teff 5280.0 +70.0 -70.0 K |
Log(g) 4.6 +0.07 -0.07 cm/s2 |
Fe/H 0.08 +0.05 -0.05 dex |
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| ExoClock Status | |||||
|---|---|---|---|---|---|
| Observing Priority | LOW | ||||
| Minimum aperture | 8.02" | ||||
| Total Observations (Recent) | 53 (3) | ||||
| O-C | 6.46 ± 0.61 minutes | ||||
| ExoClock Observations (Recent) | 14 (3) | ||||
| Space Observations (Recent) | 38 (0) | ||||
| ETD Observations (Recent) | 0 (0) | ||||
| Literature Mid-times (Recent) | 1 (0) | ||||
| Kepler Rp/Rs | 0.13748 ± 0.00015 | ||||
| TESS Rp/Rs | - | ||||
ExoClock Observations |
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| Planet Observation Date |
Observer Observatory |
Telescope Camera / Filter / Exp [s] |
O-C minutes |
|
|---|---|---|---|---|
| K2-31b (LOW) 2026-06-24 | Daniele Gasparri Observatorio Desierto Cosmico | Skywatcher Explorer 200PDS ZWO ASI 2600MC / V / 120.0 | 4.95 ± 1.58 | |
| K2-31b (LOW) 2026-05-22 | Zlatko Orbanić Explorer Observatory | Ritchey-Chrétien 16" F6.4 400/2560 Zwo 2600MM / Clear / 30.0 | 12.69 ± 2.88 | |
| K2-31b (LOW) 2025-06-28 | Yves Jongen Deep Sky Chile | Plane Wave CDK 17" Moravian 4G / Lum / 45.0 | 3.14 ± 0.86 | |
| K2-31b (LOW) 2025-04-22 | Darryl Madison Ajijic Observatory | Celestron CPC 800 Edge HD ZWO2400MC / Clear / 90.0 | 0.14 ± 3.6 | |
| K2-31b (LOW) 2024-07-09 | Yen-Hsing Lin NTHU Observatory | Showa 10" ASI6200MM Pro / Lum / 60.0 | 8.46 ± 2.59 | |
| K2-31b (LOW) 2024-07-02 | Jean-Pascal Vignes Deep Sky Chile | Planewave CDK400 QHYCCD 600M / rpr / 45.0 | 14.58 ± 1.34 | |
| K2-31b (LOW) 2024-06-16 | Mercedes Correa Calar Alto | CAHA 1.23m ZWO ASI 461 / R / 40.0 | 8.86 ± 4.61 | |
| K2-31b (LOW) 2024-05-29 | Fred Denjean Cerro Tololo Observatory | LCO Meade SBIG STX6303 / rpr / 14.999 | 5.1 ± 1.18 | |
| K2-31b (LOW) 2024-05-14 | Deborah Smith Complejo Astronomico Los Coloraos, Gorafe | Celestron C11 EdgeHD ASI2600MM / R / 120.0 | 0.11 ± 3.17 | |
| K2-31b (LOW) 2023-03-08 | Jean-Pascal Vignes Deep Sky Chile | Planewave CDK400 QHYCCD 600M / Lum / 30.0 | -0.52 ± 1.02 | |
| K2-31b (LOW) 2022-05-05 | Yves Jongen Deep Sky Chile | Plane Wave CDK 17" Moravian 4G / R / 60.0 | 3.02 ± 1.58 | |
| K2-31b (LOW) 2022-04-25 | Yves Jongen Deep Sky Chile | Plane Wave CDK 17" Moravian 4G / R / 60.0 | -0.16 ± 0.86 | |
| K2-31b (LOW) 2021-10-01 | Yves Jongen Deep Sky Chile | Plane Wave CDK 17" Moravian 4G / R / 60.0 | 1.05 ± 1.87 | |
| K2-31b (LOW) 2021-09-26 | Yves Jongen Deep Sky Chile | Plane Wave CDK 17" Moravian 4G / R / 40.0 | -0.69 ± 2.59 | |
Space Observations |
||||
| Planet Observation Date |
Mission | O-C minutes |
||
| K2-31b (LOW) 2014-11-08 | K2 | 1.53 ± 0.89 | ||
| K2-31b (LOW) 2014-11-07 | K2 | -2.24 ± 0.68 | ||
| K2-31b (LOW) 2014-11-06 | K2 | -0.28 ± 0.12 | ||
| K2-31b (LOW) 2014-11-03 | K2 | 2.94 ± 4.18 | ||
| K2-31b (LOW) 2014-10-31 | K2 | 0.37 ± 0.17 | ||
| K2-31b (LOW) 2014-10-29 | K2 | 0.77 ± 2.02 | ||
| K2-31b (LOW) 2014-10-22 | K2 | 1.25 ± 0.48 | ||
| K2-31b (LOW) 2014-10-20 | K2 | -1.76 ± 2.16 | ||
| K2-31b (LOW) 2014-10-19 | K2 | -1.26 ± 1.87 | ||
| K2-31b (LOW) 2014-10-18 | K2 | -0.87 ± 0.76 | ||
| K2-31b (LOW) 2014-10-17 | K2 | 0.06 ± 0.13 | ||
| K2-31b (LOW) 2014-10-15 | K2 | -0.78 ± 0.39 | ||
| K2-31b (LOW) 2014-10-12 | K2 | -2.13 ± 3.46 | ||
| K2-31b (LOW) 2014-10-10 | K2 | -2.43 ± 1.4 | ||
| K2-31b (LOW) 2014-10-09 | K2 | 4.64 ± 2.74 | ||
| K2-31b (LOW) 2014-10-05 | K2 | -4.51 ± 4.46 | ||
| K2-31b (LOW) 2014-10-04 | K2 | 0.2 ± 0.19 | ||
| K2-31b (LOW) 2014-10-03 | K2 | -3.94 ± 3.89 | ||
| K2-31b (LOW) 2014-10-02 | K2 | 1.5 ± 0.48 | ||
| K2-31b (LOW) 2014-09-29 | K2 | 0.59 ± 3.6 | ||
| K2-31b (LOW) 2014-09-27 | K2 | 0.88 ± 4.03 | ||
| K2-31b (LOW) 2014-09-25 | K2 | -1.43 ± 0.2 | ||
| K2-31b (LOW) 2014-09-24 | K2 | 0.43 ± 0.11 | ||
| K2-31b (LOW) 2014-09-23 | K2 | -0.13 ± 0.48 | ||
| K2-31b (LOW) 2014-09-22 | K2 | 4.76 ± 3.46 | ||
| K2-31b (LOW) 2014-09-20 | K2 | -0.74 ± 1.15 | ||
| K2-31b (LOW) 2014-09-19 | K2 | -2.51 ± 0.69 | ||
| K2-31b (LOW) 2014-09-16 | K2 | -1.15 ± 0.45 | ||
| K2-31b (LOW) 2014-09-14 | K2 | 1.04 ± 0.33 | ||
| K2-31b (LOW) 2014-09-13 | K2 | 5.54 ± 3.74 | ||
| K2-31b (LOW) 2014-09-11 | K2 | -4.18 ± 2.02 | ||
| K2-31b (LOW) 2014-09-10 | K2 | 5.4 ± 3.02 | ||
| K2-31b (LOW) 2014-09-06 | K2 | -2.31 ± 3.46 | ||
| K2-31b (LOW) 2014-09-05 | K2 | -0.34 ± 0.2 | ||
| K2-31b (LOW) 2014-09-03 | K2 | 0.72 ± 0.48 | ||
| K2-31b (LOW) 2014-09-01 | K2 | -2.32 ± 2.16 | ||
| K2-31b (LOW) 2014-08-26 | K2 | -0.11 ± 0.1 | ||
| K2-31b (LOW) 2014-08-25 | K2 | 1.62 ± 0.32 | ||
Literature Mid-times |
||||
| Planet Observation Date |
Reference | O-C minutes |
||
| 2015-06-18 | Grziwa et al. 2016 | -0.42 ± 0.35 | ||