| The Star | |||||
|---|---|---|---|---|---|
| Simbad GAIA 2MASS |
HAT-P-31 DR2 4583004815239650176 J18060904+2625359 |
||||
| RA | 18:06:09.0499 | DEC | +26:25:35.989 | ||
| Parallax 2.878 mas |
P.M. RA -7.437 mas/y |
P.M. DEC -13.402 mas/y |
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| MagV 11.67 |
MagR 11.49 |
MagI* 10.974 |
MagJ 10.423 |
MagH 10.128 |
MagK 10.083 |
| MagG 11.45 |
MagGBP 11.782 |
MagGRP 10.975 |
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| *Calculated from GAIA magnitudes. | |||||
Ephemeris
- Verified 
|
|||||
|---|---|---|---|---|---|
| Kokori et al. 2025 | |||||
| Mid-time 2459150.9749 ± 0.00026 BJDTDB |
|||||
| Period 5.0052728 ± 2.3e-06 days |
|||||
| Transit Parameters | |||||
| Kipping et al. 2011 | |||||
| Rp/Rs** 0.08513 ± 0.00044 |
a/Rs** 9.34 +0.15 -0.15 |
i 87.1 +1.8 -2.7 deg |
|||
| e 0.245 +0.004 -0.004 |
ω 274.3 +1.8 -1.8 deg |
||||
| DepthR* 8.69 mmag |
Duration* 4.81 hours |
||||
|
*Calculated from the other parameters, using PyLightcurve.
**Adjusted based on the space observations. |
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| Limb Darkening Parameters | |||||
| Kipping et al. 2011 | |||||
| Teff 6065.0 +100.0 -100.0 K |
Log(g) 4.26 +0.18 -0.18 cm/s2 |
Fe/H 0.15 +0.08 -0.08 dex |
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| ExoClock Status | |||||
|---|---|---|---|---|---|
| Observing Priority | MEDIUM | ||||
| Minimum aperture | 6.7" | ||||
| Total Observations (Recent) | 26 (1) | ||||
| O-C | -3.38 ± 1.93 minutes | ||||
| ExoClock Observations (Recent) | 5 (1) | ||||
| Space Observations (Recent) | 14 (0) | ||||
| ETD Observations (Recent) | 3 (0) | ||||
| Literature Mid-times (Recent) | 4 (0) | ||||
| Kepler Rp/Rs | - | ||||
| TESS Rp/Rs | 0.08513 ± 0.00044 | ||||
ExoClock Observations |
||||
| Planet Observation Date |
Observer Observatory |
Telescope Camera / Filter / Exp [s] |
O-C minutes |
|
|---|---|---|---|---|
| HAT-P-31b (MEDIUM) 2025-07-26 | Kyle Carr Walnut Park | Celestron C8 ASI533MM Pro / AstrodonExoPlanet-BB / 90.0 | -5.74 ± 4.18 | |
| HAT-P-31b (MEDIUM) 2024-07-30 | Nello Ruocco Osservatorio Astronomico Nastro Verde di Sorrento MPC code C82 | SC Meade LX200 GPS on equatorial fork Sbig ST10XME / Clear / 120.0 | -3.24 ± 2.3 | |
| HAT-P-31b (MEDIUM) 2024-07-25 | Paolo Arcangelo Matassa P:M.P.H.R. Deep Sky (K81) | Ritchey Chretien 40cm-F5.3 CCD ICX453AQ / Lum / 60.0 | 1.33 ± 6.62 | |
| HAT-P-31b (MEDIUM) 2022-05-17 | David Arnot OSO PIRATE | PlaneWave Instruments CDK24 24 inch (610 mm) f/6.5 Corrected Dall-Kirkham Astrograph FLI ProLine KAF-16803 / R / 45.0 | 2.27 ± 1.3 | |
| HAT-P-31b (MEDIUM) 2019-07-10 | Yves Jongen Rasteau Observatory | Plane Wave CDK 17" SBIG STXL 11002 / R / 120.0 | 2.18 ± 2.3 | |
Space Observations |
||||
| Planet Observation Date |
Mission | O-C minutes |
||
| HAT-P-31b (MEDIUM) 2022-07-06 | TESS | 0.64 ± 1.44 | ||
| HAT-P-31b (MEDIUM) 2022-06-21 | TESS | 1.1 ± 1.73 | ||
| HAT-P-31b (MEDIUM) 2022-06-16 | TESS | -2.25 ± 1.73 | ||
| HAT-P-31b (MEDIUM) 2021-07-20 | TESS | 0.35 ± 1.58 | ||
| HAT-P-31b (MEDIUM) 2021-07-15 | TESS | -2.86 ± 1.87 | ||
| HAT-P-31b (MEDIUM) 2021-07-10 | TESS | -4.19 ± 1.87 | ||
| HAT-P-31b (MEDIUM) 2021-07-05 | TESS | 1.96 ± 1.87 | ||
| HAT-P-31b (MEDIUM) 2021-06-30 | TESS | -1.1 ± 2.02 | ||
| HAT-P-31b (MEDIUM) 2021-06-25 | TESS | -1.58 ± 1.73 | ||
| HAT-P-31b (MEDIUM) 2020-06-30 | TESS | 1.94 ± 2.02 | ||
| HAT-P-31b (MEDIUM) 2020-06-25 | TESS | -1.56 ± 2.02 | ||
| HAT-P-31b (MEDIUM) 2020-06-20 | TESS | 0.42 ± 1.73 | ||
| HAT-P-31b (MEDIUM) 2020-06-15 | TESS | 0.38 ± 2.16 | ||
| HAT-P-31b (MEDIUM) 2020-06-10 | TESS | 0.06 ± 1.87 | ||
ETD Observations |
||||
| Planet Observation Date |
Observer(s) | ETD link | O-C minutes |
|
| HAT-P-31b (MEDIUM) 2019-05-31 | Yves Jongen | 1559373273 | 6.05 ± 4.32 | |
| HAT-P-31b (MEDIUM) 2018-08-14 | Wonseok Kang | 1535340114 | -1.55 ± 2.59 | |
| HAT-P-31b (MEDIUM) 2018-07-20 | Wonseok Kang | 1533433298 | -0.02 ± 1.15 | |
Literature Mid-times |
||||
| Planet Observation Date |
Reference | O-C minutes |
||
| 2018-08-04 | Mallonn et al. 2019 | 4.11 ± 3.07 | ||
| 2018-07-30 | Mallonn et al. 2019 | -4.12 ± 4.9 | ||
| 2018-07-20 | Mallonn et al. 2019 | -0.79 ± 1.89 | ||
| 2007-08-08 | Kipping et al. 2011 | -0.07 ± 7.34 | ||