| The Star | |||||
|---|---|---|---|---|---|
| Simbad GAIA 2MASS |
BD+26 2091 DR2 727624020367528576 J10281500+2534236 |
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| RA | 10:28:15.0111 | DEC | +25:34:23.474 | ||
| Parallax 4.558 mas |
P.M. RA 14.098 mas/y |
P.M. DEC -12.2 mas/y |
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| MagV 9.98 |
MagR 9.9 |
MagI* 9.4 |
MagJ 9.017 |
MagH 8.79 |
MagK 8.689 |
| MagG 9.957 |
MagGBP 10.199 |
MagGRP 9.527 |
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| *Calculated from GAIA magnitudes. | |||||
Ephemeris
- Verified 
|
|||||
|---|---|---|---|---|---|
| Kokori et al. 2022 | |||||
| Mid-time 2456617.81302 ± 0.00031 BJDTDB |
|||||
| Period 2.98958682 ± 9.9e-07 days |
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| Transit Parameters | |||||
| Eastman et al. 2016 | |||||
| Rp/Rs 0.1089 ± 0.0005 |
a/Rs 5.79 +0.09 -0.08 |
i 83.16 +0.22 -0.21 deg |
|||
| e - |
ω - deg |
||||
| DepthR* 13.52 mmag |
Duration* 3.46 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 | |||||
| Eastman et al. 2016 | |||||
| Teff 6206.0 +75.0 -75.0 K |
Log(g) 4.11 +0.01 -0.01 cm/s2 |
Fe/H -0.12 +0.07 -0.07 dex |
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| ExoClock Status | |||||
|---|---|---|---|---|---|
| Observing Priority | LOW | ||||
| Minimum aperture | 5.0" | ||||
| Total Observations (Recent) | 52 (13) | ||||
| O-C | 1.94 ± 0.43 minutes | ||||
| ExoClock Observations (Recent) | 33 (13) | ||||
| Space Observations (Recent) | 0 (0) | ||||
| ETD Observations (Recent) | 1 (0) | ||||
| Literature Mid-times (Recent) | 18 (0) | ||||
| Kepler Rp/Rs | - | ||||
| TESS Rp/Rs | - | ||||
ExoClock Observations |
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| Planet Observation Date |
Observer Observatory |
Telescope Camera / Filter / Exp [s] |
O-C minutes |
|
|---|---|---|---|---|
| KELT-4Ab (LOW) 2025-03-20 | Wilfried Hartmann Observatory Vineyard | Takahashi Epsilon 130D ASI2600MM-Pro / R / 25.0 | 4.49 ± 4.18 | |
| KELT-4Ab (LOW) 2025-03-02 | Philippe Langlet NDCruet | Célestron 8 APN CANON 1100D / Clear / 120.0 | 5.1 ± 2.16 | |
| KELT-4Ab (LOW) 2025-03-02 | Daniel Kustrin Daniel Kustrin | Sky Watcher Classic 200P ZWO ASI2600MM-Pro / R / 30.0 | 1.07 ± 4.9 | |
| KELT-4Ab (LOW) 2025-03-02 | Adrian Jones Private Observatory (I64) | Meade ACF 30cm QSI 583 / R / 170.0 | 0.06 ± 2.45 | |
| KELT-4Ab (LOW) 2025-03-02 | Simon Dawes William James II | Celestron Edge11 HD Risingcam Monochrome SONY imx571 / R / 105.0 | -1.67 ± 4.61 | |
| KELT-4Ab (LOW) 2025-02-16 | Tommaso Dittadi TD-TRO | Ritchey-Chretien Moravian G2-1600 / R / 90.0 | 4.0 ± 1.58 | |
| KELT-4Ab (LOW) 2025-02-01 | samuel Diaz Lopez Tomas Lopez (AstroCamp) | SCA260 Atik16200MM / V / 93.0 | -2.29 ± 1.73 | |
| KELT-4Ab (LOW) 2025-02-01 | samuel Diaz Lopez Tomas Lopez (AstroCamp) | SCA260 Atik16200MM / Lum / 93.0 | -5.46 ± 1.73 | |
| KELT-4Ab (LOW) 2025-01-29 | Karl Plapp OSO PIRATE Mk 4 | Plane Wave CDK24 FLI PL KAF-16803 / R / 40.0 | 2.63 ± 1.09 | |
| KELT-4Ab (LOW) 2025-01-17 | Tommaso Dittadi TD-TRO | Ritchey-Chretien Moravian G2-1600 / R / 90.0 | 6.11 ± 1.58 | |
| KELT-4Ab (LOW) 2025-01-14 | Ramon Naves Montcabrer | Meade LX200 12" ACF Moravian G4-9000 / ipr / 60.0 | 0.53 ± 0.92 | |
| KELT-4Ab (LOW) 2025-01-02 | John Collins JC_Wrexham | Meade LX200GPS ASI-290m / rpr / 60.0 | 5.15 ± 2.02 | |
| KELT-4Ab (LOW) 2024-12-30 | Matthieu Bachschmidt Gonachon | Celestron C11 SBIG ST8XME / R / 60.0 | 6.14 ± 2.45 | |
| KELT-4Ab (LOW) 2024-03-12 | Charles Miller Miller Observatory | Meade 12" LX850 QHY268M / R / 40.0 | -0.33 ± 1.58 | |
| KELT-4Ab (LOW) 2024-02-05 | Darryl Madison Ajijic Observatory | Celestron CPC 800 Edge HD ZWO2400MC / Clear / 30.0 | 4.89 ± 1.35 | |
| KELT-4Ab (LOW) 2023-05-06 | Bryan Martin Tiger Butte Observatory Remote | AG Optical IDK ZWO ASI 294 / I / 60.0 | -0.72 ± 5.9 | |
| KELT-4Ab (LOW) 2023-04-30 | Bryan Martin Tiger Butte Observatory Remote | AG Optical IDK ZWO ASI 294 / I / 60.0 | 4.29 ± 4.9 | |
| KELT-4Ab (LOW) 2022-01-06 | Alexander Putz home | William Optics G2-8300 Moravian / R / 60.0 | 8.88 ± 4.75 | |
| KELT-4Ab (LOW) 2022-01-06 | Alexander Putz Alex | William Optics Moravian G2-8300 Moravian / R / 60.0 | -5.37 ± 7.2 | |
| KELT-4Ab (LOW) 2021-12-02 | Martin Crow Burnham Observatory | Celestron C9.25 SX694 mono / R / 40.0 | -2.72 ± 3.31 | |
| KELT-4Ab (LOW) 2021-04-24 | Fabio Mortari Hypatia Observatory | Ritchey Chretienne 250mm f/5.3 Sbig ST8-XE / R / 120.0 | -0.24 ± 2.74 | |
| KELT-4Ab (LOW) 2021-04-03 | Martin Smith Heathwood Road | Skywatcher 120mm ED Apochromatic Atik 414 ex / Clear / 6.0 | 1.79 ± 2.16 | |
| KELT-4Ab (LOW) 2021-04-03 | John Savage Z42 Rushay Farm Observatory | Celestron 14Edge FR ZWO ASI6200MM / Lum / 10.0 | 0.05 ± 0.81 | |
| KELT-4Ab (LOW) 2021-03-31 | Lorenzo Betti Osservatorio Polifunzionale del Chianti | RC-80cm Moravian G4 - KAF 09000 / V / 20.0 | -3.73 ± 1.12 | |
| KELT-4Ab (LOW) 2021-03-11 | Harri Kiiskinen Harri Kiiskinen | Takahashi FSQ-85ED QHY163M / R / 30.0 | 0.48 ± 4.32 | |
| KELT-4Ab (LOW) 2021-03-11 | Adam Popowicz Observatory Pyskowice | RC12" GSO ASI ZWO 1600 MM / ATIK 11000M / R / 60.0 | -2.11 ± 2.02 | |
| KELT-4Ab (LOW) 2021-03-08 | Fabio Mortari Hypatia Observatory | Ritchey Chretienne 250mm f/5.3 Sbig ST8-XE / R / 120.0 | 3.06 ± 4.32 | |
| KELT-4Ab (LOW) 2021-03-08 | Nigel Stanbury Nigel Stanbury | Skywatcher Esprit 150 ED ZWO ASI533MC PRO / R / 30.0 | 0.47 ± 2.02 | |
| KELT-4Ab (LOW) 2021-03-02 | John Savage Z42 Rushay Farm Observatory | Celestron 14Edge FR ZWO ASI6200MM / rpr / 60.0 | 1.44 ± 1.15 | |
| KELT-4Ab (LOW) 2021-03-02 | Lionel Rousselot Private observatory Vierzon | Newton 250/1200 ZWO 1600 monochrome / Clear / 90.0 | -3.89 ± 1.73 | |
| KELT-4Ab (LOW) 2021-02-21 | Thomas Mollier Tomastro | Newtonian ZWO ASI1600MMC / Clear / 15.0 | 2.67 ± 3.6 | |
| KELT-4Ab (LOW) 2021-02-21 | Yves Jongen Rasteau Observatory | Plane Wave CDK 17" SBIG STXL 11002 / R / 60.0 | -1.93 ± 1.73 | |
| KELT-4Ab (LOW) 2021-01-22 | Martin Smith Heathwood Road | Skywatcher 120mm ED Apochromatic Atik 414 ex / Clear / 8.0 | -1.98 ± 1.87 | |
ETD Observations |
||||
| Planet Observation Date |
Observer(s) | ETD link | O-C minutes |
|
| KELT-4Ab (LOW) 2021-04-06 | Anaël Wünsche | 1617825255 | -0.5 ± 1.58 | |
Literature Mid-times |
||||
| Planet Observation Date |
Reference | O-C minutes |
||
| 2013-04-17 | Eastman et al. 2016 | 3.19 ± 3.6 | ||
| 2013-03-12 | Eastman et al. 2016 | 0.98 ± 0.59 | ||
| 2013-02-13 | Eastman et al. 2016 | 0.51 ± 0.84 | ||
| 2013-02-13 | Eastman et al. 2016 | -1.24 ± 1.44 | ||
| 2013-02-10 | Eastman et al. 2016 | 5.32 ± 1.41 | ||
| 2013-02-04 | Eastman et al. 2016 | -0.18 ± 0.53 | ||
| 2013-02-01 | Eastman et al. 2016 | 3.87 ± 1.87 | ||
| 2013-01-20 | Eastman et al. 2016 | 1.84 ± 0.52 | ||
| 2012-12-27 | Eastman et al. 2016 | -8.65 ± 1.28 | ||
| 2012-12-18 | Eastman et al. 2016 | -2.32 ± 0.55 | ||
| 2012-06-10 | Eastman et al. 2016 | 0.21 ± 1.73 | ||
| 2012-05-23 | Eastman et al. 2016 | -0.48 ± 1.87 | ||
| 2012-05-14 | Eastman et al. 2016 | 1.77 ± 1.73 | ||
| 2012-05-08 | Eastman et al. 2016 | -0.57 ± 2.02 | ||
| 2012-04-29 | Eastman et al. 2016 | -0.13 ± 1.32 | ||
| 2012-04-20 | Eastman et al. 2016 | 5.65 ± 1.87 | ||
| 2012-04-08 | Eastman et al. 2016 | -3.5 ± 2.16 | ||
| 2012-03-30 | Eastman et al. 2016 | -2.26 ± 1.58 | ||