| The Star | |||||
|---|---|---|---|---|---|
| Simbad GAIA 2MASS |
HD 17156 DR2 545560867790611072 J02494447+7145115 |
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| RA | 02:49:44.4866 | DEC | +71:45:11.632 | ||
| Parallax 12.778 mas |
P.M. RA 90.982 mas/y |
P.M. DEC -33.197 mas/y |
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| MagV 8.16 |
MagR* 7.824 |
MagI* 7.509 |
MagJ 7.08 |
MagH 6.857 |
MagK 6.763 |
| MagG 8.033 |
MagGBP 8.352 |
MagGRP 7.597 |
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| *Calculated from GAIA magnitudes. | |||||
Ephemeris
- Verified 
|
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|---|---|---|---|---|---|
| Kokori et al. 2025 | |||||
| Mid-time 2456581.344218 ± 5.3e-05 BJDTDB |
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| Period 21.21643907 ± 5.3e-07 days |
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| Transit Parameters | |||||
| Nutzman et al. 2011 | |||||
| Rp/Rs 0.0745 ± 0.0003 |
a/Rs 23.2 +0.3 -0.3 |
i 86.49 +0.24 -0.2 deg |
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| e 0.677 +0.003 -0.003 |
ω 121.7 +0.4 -0.4 deg |
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| DepthR* 6.89 mmag |
Duration* 3.13 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 | |||||
| Barbieri et al. 2009 | |||||
| Teff 6100.0 +75.0 -75.0 K |
Log(g) 4.22 +0.05 -0.05 cm/s2 |
Fe/H 0.0 +0.0 -0.0 dex |
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| ExoClock Status | |||||
|---|---|---|---|---|---|
| Observing Priority | MEDIUM | ||||
| Minimum aperture | 5.0" | ||||
| Total Observations (Recent) | 31 (3) | ||||
| O-C | 0.9 ± 0.97 minutes | ||||
| ExoClock Observations (Recent) | 12 (3) | ||||
| Space Observations (Recent) | 8 (0) | ||||
| ETD Observations (Recent) | 3 (0) | ||||
| Literature Mid-times (Recent) | 8 (0) | ||||
| Kepler Rp/Rs | - | ||||
| TESS Rp/Rs | 0.0743 ± 0.00014 | ||||
ExoClock Observations |
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| Planet Observation Date |
Observer Observatory |
Telescope Camera / Filter / Exp [s] |
O-C minutes |
|
|---|---|---|---|---|
| HD17156b (MEDIUM) 2025-11-14 | Giovanni Calapai Home Astronomical Observatory | Celestron 11 Schmidt-Cassegrain Atik 314L+ / Clear / 90.0 | -0.21 ± 2.02 | |
| HD17156b (MEDIUM) 2025-08-21 | John Savage Rushay Farm Z42 | Skywatcher Esprit 150 ZWO ASI 6200MM / R / 5.0 | 4.48 ± 2.74 | |
| HD17156b (MEDIUM) 2025-08-21 | Anis Ben Lassoued Sousse Observatory | Maksutov Cassegrain ASI 533MM PRO / R / 30.0 | 0.45 ± 4.18 | |
| HD17156b (MEDIUM) 2024-10-28 | Paolo Arcangelo Matassa P:M.P.H.R. Deep Sky (K81) | Ritchey Chretien 40cm-F5.3 CCD ICX453AQ / R / 15.0 | 7.0 ± 3.46 | |
| HD17156b (MEDIUM) 2024-10-28 | Matthieu Bachschmidt Gonachon | Celestron C11 SBIG ST8XME / R / 20.0 | -0.49 ± 1.58 | |
| HD17156b (MEDIUM) 2024-04-21 | John Collins JC_Wrexham | Meade LX200GPS ASI-290m / rpr / 120.0 | 0.01 ± 2.59 | |
| HD17156b (MEDIUM) 2023-06-28 | Yves Jongen Rasteau Observatory | Plane Wave CDK 17" SBIG STXL 11002 / R / 20.0 | 2.1 ± 5.18 | |
| HD17156b (MEDIUM) 2021-01-18 | Claudio Lopresti Claudio Lopresti | Mak-Newton CCD Sbig ST10xme / I / 120.0 | 0.29 ± 2.02 | |
| HD17156b (MEDIUM) 2020-11-16 | Steven Peterson Vail View Observatory H18 | GSO 14 RC SBIG STL6303E / I / 60.0 | 0.34 ± 1.31 | |
| HD17156b (MEDIUM) 2011-09-13 | Alessandro Marchini Astronomical Observatory University of Siena | Mak-Cas 0.3m f/5.6 Sbig STL-6303 / R / 90.0 | 1.71 ± 1.44 | |
| HD17156b (MEDIUM) 2010-10-29 | Alessandro Marchini Astronomical Observatory University of Siena | Mak-Cas 0.3m f/5.6 Sbig STL-6303 / R / 90.0 | 6.73 ± 1.73 | |
| HD17156b (MEDIUM) 2007-09-10 | Claudio Lopresti Claudio Lopresti | Mak-Newton CCD Sbig ST10xme / R / 60.0 | -3.19 ± 2.16 | |
Space Observations |
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| Planet Observation Date |
Mission | O-C minutes |
||
| HD17156b (MEDIUM) 2023-12-15 | TESS | 0.04 ± 0.26 | ||
| HD17156b (MEDIUM) 2022-12-20 | TESS | 0.17 ± 0.26 | ||
| HD17156b (MEDIUM) 2022-11-28 | TESS | -0.25 ± 0.27 | ||
| HD17156b (MEDIUM) 2022-06-12 | TESS | -0.07 ± 0.29 | ||
| HD17156b (MEDIUM) 2022-05-21 | TESS | -0.03 ± 0.33 | ||
| HD17156b (MEDIUM) 2020-05-30 | TESS | -0.23 ± 0.33 | ||
| HD17156b (MEDIUM) 2019-12-12 | TESS | -0.03 ± 0.29 | ||
| HD17156b (MEDIUM) 2019-11-21 | TESS | 0.29 ± 0.3 | ||
ETD Observations |
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| Planet Observation Date |
Observer(s) | ETD link | O-C minutes |
|
| HD17156b (MEDIUM) 2014-09-20 | Paul Benni | 1411231166 | -1.21 ± 1.44 | |
| HD17156b (MEDIUM) 2012-12-01 | Osamu Ohshima | 1354399979 | -1.92 ± 2.3 | |
| HD17156b (MEDIUM) 2010-10-29 | Claudio Lopresti | 1288465326 | 4.57 ± 4.32 | |
Literature Mid-times |
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| Planet Observation Date |
Reference | O-C minutes |
||
| 2009-02-21 | Nutzman et al. 2011 | -0.35 ± 0.15 | ||
| 2008-12-19 | Nutzman et al. 2011 | -0.25 ± 0.16 | ||
| 2008-11-07 | Nutzman et al. 2011 | 0.32 ± 0.12 | ||
| 2008-10-17 | Barbieri et al. 2009 | 2.41 ± 2.95 | ||
| 2007-12-25 | Winn et al. 2009 | 0.46 ± 0.65 | ||
| 2007-12-03 | Gillon et al. 2008 | -0.59 ± 1.11 | ||
| 2007-11-12 | Narita et al. 2008 | -3.07 ± 3.02 | ||
| 2007-10-01 | Irwin et al. 2008 | 0.64 ± 2.88 | ||