| The Star | |||||
|---|---|---|---|---|---|
| Simbad GAIA 2MASS |
WASP-138 DR2 2498515516990171392 J02463338-0027501 |
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| RA | 02:46:33.3867 | DEC | -00:27:50.316 | ||
| Parallax 2.386 mas |
P.M. RA 11.247 mas/y |
P.M. DEC -34.464 mas/y |
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| MagV 11.79 |
MagR 11.74 |
MagI* 11.182 |
MagJ 10.782 |
MagH 10.54 |
MagK 10.494 |
| MagG 11.687 |
MagGBP 11.968 |
MagGRP 11.263 |
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| *Calculated from GAIA magnitudes. | |||||
Ephemeris
- Verified 
|
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|---|---|---|---|---|---|
| Kokori et al. 2022 | |||||
| Mid-time 2458257.03694 ± 0.00036 BJDTDB |
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| Period 3.6344327 ± 1.5e-06 days |
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| Transit Parameters | |||||
| Lam et al. 2017 | |||||
| Rp/Rs 0.0826 ± 0.0008 |
a/Rs** 7.39 +0.15 -0.15 |
i 88.5 +0.9 -1.2 deg |
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| e - |
ω - deg |
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| DepthR* 8.91 mmag |
Duration* 4.02 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 | |||||
| Lam et al. 2017 | |||||
| Teff 6272.0 +96.0 -96.0 K |
Log(g) 4.25 +0.02 -0.02 cm/s2 |
Fe/H -0.09 +0.1 -0.1 dex |
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| ExoClock Status | |||||
|---|---|---|---|---|---|
| Observing Priority | MEDIUM | ||||
| Minimum aperture | 7.22" | ||||
| Total Observations (Recent) | 19 (2) | ||||
| O-C | 4.44 ± 1.74 minutes | ||||
| ExoClock Observations (Recent) | 7 (2) | ||||
| Space Observations (Recent) | 10 (0) | ||||
| ETD Observations (Recent) | 1 (0) | ||||
| Literature Mid-times (Recent) | 1 (0) | ||||
| Kepler Rp/Rs | - | ||||
| TESS Rp/Rs | 0.08722 ± 0.00055 | ||||
ExoClock Observations |
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| Planet Observation Date |
Observer Observatory |
Telescope Camera / Filter / Exp [s] |
O-C minutes |
|
|---|---|---|---|---|
| WASP-138b (MEDIUM) 2023-10-13 | Marc Serrau A77 - Dauban | Meade SC 12" QHY260MM / rpr / 300.0 | 6.49 ± 3.6 | |
| WASP-138b (MEDIUM) 2023-10-02 | David Quiles David Quiles Observatory | Celestron EDGEHD 800 Omegon veTEC 571M / R / 120.0 | 8.07 ± 2.74 | |
| WASP-138b (MEDIUM) 2023-01-09 | Martin Crow Burnham Observatory | Celestron C9.25 SX694 mono / R / 150.0 | -0.88 ± 2.88 | |
| WASP-138b (MEDIUM) 2021-11-06 | Robert Roth TURMX Observatory | Planewave CDK17 QHY600M / rpr / 60.0 | 1.22 ± 1.73 | |
| WASP-138b (MEDIUM) 2021-11-03 | Steven Peterson Vail View Observatory H18 | GSO 10" RC f/8.0 SBIG STL6303E / I / 120.0 | -5.93 ± 2.74 | |
| WASP-138b (MEDIUM) 2020-12-14 | Carmelo Falco GALHassin Robotic Telescope 2 (GRT2) | Giacometti-Fogale RC16 Andor Apogee Aspen CG16M / rpr / 60.0 | 3.3 ± 2.3 | |
| WASP-138b (MEDIUM) 2020-12-14 | Carmelo Falco GAL Hassin Robotic Telescope 2 (GRT2) - Multiband | Giacometti-Fogale RC16 - 2 Andor Apogee Aspen CG16M / gpr / 60.0 | -0.73 ± 3.02 | |
Space Observations |
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| Planet Observation Date |
Mission | O-C minutes |
||
| WASP-138b (MEDIUM) 2020-11-15 | TESS | 2.02 ± 1.18 | ||
| WASP-138b (MEDIUM) 2020-11-12 | TESS | 0.78 ± 1.27 | ||
| WASP-138b (MEDIUM) 2020-11-08 | TESS | 0.76 ± 1.24 | ||
| WASP-138b (MEDIUM) 2020-11-01 | TESS | -0.17 ± 1.44 | ||
| WASP-138b (MEDIUM) 2020-10-28 | TESS | 0.63 ± 1.18 | ||
| WASP-138b (MEDIUM) 2020-10-24 | TESS | 1.37 ± 1.44 | ||
| WASP-138b (MEDIUM) 2018-11-12 | TESS | -0.95 ± 1.41 | ||
| WASP-138b (MEDIUM) 2018-11-08 | TESS | -4.19 ± 1.44 | ||
| WASP-138b (MEDIUM) 2018-11-05 | TESS | -4.14 ± 1.44 | ||
| WASP-138b (MEDIUM) 2018-10-21 | TESS | -4.17 ± 1.27 | ||
ETD Observations |
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| Planet Observation Date |
Observer(s) | ETD link | O-C minutes |
|
| WASP-138b (MEDIUM) 2020-10-24 | F. Lomoz | 1603607703 | 2.81 ± 5.33 | |
Literature Mid-times |
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| Planet Observation Date |
Reference | O-C minutes |
||
| 2015-10-31 | Lam et al. 2017 | 0.65 ± 0.46 | ||