| The Star | |||||
|---|---|---|---|---|---|
| Simbad GAIA 2MASS |
K2-139 DR2 4084602654011029376 J19161596-1754384 |
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| RA | 19:16:15.9691 | DEC | -17:54:38.410 | ||
| Parallax 6.471 mas |
P.M. RA 37.281 mas/y |
P.M. DEC -10.472 mas/y |
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| MagV 11.65 |
MagR* 11.211 |
MagI* 10.727 |
MagJ 10.177 |
MagH 9.768 |
MagK 9.66 |
| MagG 11.463 |
MagGBP 11.93 |
MagGRP 10.866 |
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| *Calculated from GAIA magnitudes. | |||||
Ephemeris
- Not verified 
|
|||||
|---|---|---|---|---|---|
| Barragán et al. 2018 | |||||
| Mid-time 2457325.8171 ± 0.0003 BJDTDB |
|||||
| Period 28.3824 ± 0.0003 days |
|||||
| Transit Parameters | |||||
| Barragán et al. 2018 | |||||
| Rp/Rs 0.0961 ± 0.0023 |
a/Rs** 42.7 +1.9 -0.7 |
i 89.62 +0.25 -0.36 deg |
|||
| e 0.12 +0.12 -0.08 |
ω 124.0 +175.0 -79.0 deg |
||||
| DepthR* 12.33 mmag |
Duration* 4.89 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 | |||||
| Barragán et al. 2018 | |||||
| Teff 5340.0 +110.0 -110.0 K |
Log(g) 4.5 +0.09 -0.09 cm/s2 |
Fe/H 0.22 +0.08 -0.08 dex |
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| ExoClock Status | |||||
|---|---|---|---|---|---|
| Observing Priority | ALERT | ||||
| Minimum aperture | 5.0" | ||||
| Total Observations (Recent) | 5 (2) | ||||
| O-C | 59.86 ± 0.94 minutes | ||||
| ExoClock Observations (Recent) | 4 (2) | ||||
| Space Observations (Recent) | 1 (0) | ||||
| ETD Observations (Recent) | 0 (0) | ||||
| Literature Mid-times (Recent) | 0 (0) | ||||
| Kepler Rp/Rs | 0.09529 ± 0.00064 | ||||
| TESS Rp/Rs | - | ||||
ExoClock Observations |
||||
| Planet Observation Date |
Observer Observatory |
Telescope Camera / Filter / Exp [s] |
O-C minutes |
|
|---|---|---|---|---|
| K2-139b (ALERT) 2025-07-17 | Jean-Charles Ripault HRT Observatory | Astrosib RC360 Moravian C3-61000 / R / 30.0 | 77.9 ± 2.74 | |
| K2-139b (ALERT) 2025-07-17 | Yves Jongen Deep Sky Chile | Plane Wave CDK 17" Moravian 4G / R / 120.0 | 70.56 ± 1.87 | |
| K2-139b (ALERT) 2024-07-13 | Yves Jongen Deep Sky Chile | Plane Wave CDK 17" Moravian 4G / R / 120.0 | 56.16 ± 2.16 | |
| K2-139b (ALERT) 2024-07-13 | Jean-Pascal Vignes Deep Sky Chile | Planewave CDK400 QHYCCD 600M / Lum / 60.0 | 50.31 ± 1.43 | |
Space Observations |
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| Planet Observation Date |
Mission | O-C minutes |
||
| K2-139b (ALERT) 2015-10-30 | K2 | 2.46 ± 0.72 | ||