exoclock

WASP-4b (MEDIUM - TTVs)

Discovered by: Wilson et al. 2008

The Star
Simbad
GAIA
2MASS		 WASP-4
DR2 6535499658122055552
J23341508-4203411
RA 23:34:15.0858 DEC -42:03:41.049
Parallax
3.715 mas		 P.M. RA
9.874 mas/y		 P.M. DEC
-87.518 mas/y
MagV
12.48		 MagR
11.9		 MagI*
11.672		 MagJ
11.179		 MagH
10.842		 MagK
10.746
MagG
12.316		 MagGBP
12.71		 MagGRP
11.775
*Calculated from GAIA magnitudes.

Ephemeris - Verified True
Kokori et al. 2025
Mid-time
2456076.176644 ± 1.8e-05 BJDTDB
Period
1.338231335 ± 2.1e-08 days
Transit Parameters
Bouma et al. 2019
Rp/Rs
0.152 ± 0.0004		 a/Rs
5.451 +0.023 -0.052
 i
89.1 +0.7 -0.8 deg
e
-		 ω
- deg
DepthR*
31.37 mmag		 Duration*
2.17 hours
*Calculated from the other parameters, using PyLightcurve.
**Adjusted based on the space observations.

Limb Darkening Parameters
Wilson et al. 2008
Teff
5500.0 +150.0 -150.0 K
 Log(g)
4.3 +0.2 -0.2 cm/s2
 Fe/H
0.0 +0.2 -0.2 dex
ExoClock Status
Observing Priority MEDIUM - TTVs
Minimum aperture 5.54"
Total Observations (Recent) 156 (2)
O-C 1.07 ± 0.27 minutes
ExoClock Observations (Recent) 35 (2)
Space Observations (Recent) 63 (0)
ETD Observations (Recent) 0 (0)
Literature Mid-times (Recent) 58 (0)
Kepler Rp/Rs -
TESS Rp/Rs 0.15149 ± 0.00022

WASP-4b


ExoClock Observations
Planet
Observation Date		 Observer
Observatory		 Telescope
Camera / Filter / Exp [s]		 O-C
minutes
WASP-4b (MEDIUM - TTVs)
2025-10-12		Jean-Pascal Vignes
Deep Sky Chile		Planewave CDK400
QHYCCD 600M / R / 60.0		2.16 ± 0.46
WASP-4b (MEDIUM - TTVs)
2025-10-04		Jean-Pascal Vignes
Deep Sky Chile		Planewave CDK400
QHYCCD 600M / R / 60.0		4.6 ± 0.81
WASP-4b (MEDIUM - TTVs)
2024-12-03		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / Lum / 100.0		-0.88 ± 0.42
WASP-4b (MEDIUM - TTVs)
2024-09-27		Anaël Wünsche
El Sauce Observatory		CDK Planewave Chili
Moravian G4 16k / R / 120.0		1.44 ± 0.99
WASP-4b (MEDIUM - TTVs)
2024-09-15		Joaquin M. Ruiz-Luque
Asociación Argentina "Amigos de la Astronomía"		Sky-Watcher
Starlight Xpress Trius SX-814 / V / 30.0		2.83 ± 2.16
WASP-4b (MEDIUM - TTVs)
2024-07-14		Nicolás Castro-Morales
El Sauce		Mas500
Moravian / rpr / 90.0		0.89 ± 1.04
WASP-4b (MEDIUM - TTVs)
2023-09-17		Jean-Pascal Vignes
Deep Sky Chile		PlaneWave CDK 17"
QHYCCD 600 M / R / 60.0		1.39 ± 0.72
WASP-4b (MEDIUM - TTVs)
2023-08-29		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / Lum / 180.0		-0.58 ± 0.52
WASP-4b (MEDIUM - TTVs)
2023-08-13		Jean-Pascal Vignes
Deep Sky Chile		PlaneWave CDK 17"
QHYCCD 600 M / V / 60.0		1.0 ± 0.78
WASP-4b (MEDIUM - TTVs)
2023-05-18		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / Lum / 90.0		0.29 ± 0.46
WASP-4b (MEDIUM - TTVs)
2022-12-18		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / Lum / 180.0		-2.76 ± 0.72
WASP-4b (MEDIUM - TTVs)
2022-12-06		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / Lum / 120.0		0.16 ± 0.42
WASP-4b (MEDIUM - TTVs)
2022-12-02		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / Lum / 120.0		-1.42 ± 0.73
WASP-4b (MEDIUM - TTVs)
2022-09-30		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / Lum / 180.0		-1.11 ± 1.73
WASP-4b (MEDIUM - TTVs)
2022-09-26		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / Lum / 180.0		1.03 ± 0.65
WASP-4b (MEDIUM - TTVs)
2022-09-10		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / Lum / 180.0		-1.73 ± 1.3
WASP-4b (MEDIUM - TTVs)
2022-08-14		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / Lum / 180.0		-0.54 ± 0.86
WASP-4b (MEDIUM - TTVs)
2021-12-07		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / Lum / 120.0		-0.17 ± 0.43
WASP-4b (MEDIUM - TTVs)
2021-10-05		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / Lum / 120.0		-0.49 ± 0.43
WASP-4b (MEDIUM - TTVs)
2021-10-01		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / Lum / 120.0		0.22 ± 0.43
WASP-4b (MEDIUM - TTVs)
2021-09-27		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / R / 120.0		-0.37 ± 0.58
WASP-4b (MEDIUM - TTVs)
2021-09-23		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / R / 120.0		-0.66 ± 0.72
WASP-4b (MEDIUM - TTVs)
2021-09-03		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / R / 120.0		1.6 ± 0.86
WASP-4b (MEDIUM - TTVs)
2021-08-27		Anaël Wünsche
El Sauce Observatory		CDK Planewave Chili
Moravian G4 16k / Lum / 120.0		0.1 ± 0.58
WASP-4b (MEDIUM - TTVs)
2021-08-11		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / R / 120.0		1.21 ± 0.58
WASP-4b (MEDIUM - TTVs)
2021-08-03		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / R / 120.0		-0.24 ± 0.58
WASP-4b (MEDIUM - TTVs)
2020-12-20		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / R / 120.0		-0.11 ± 0.86
WASP-4b (MEDIUM - TTVs)
2020-12-08		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / R / 120.0		-1.28 ± 0.58
WASP-4b (MEDIUM - TTVs)
2020-10-02		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / R / 120.0		-0.04 ± 0.58
WASP-4b (MEDIUM - TTVs)
2020-09-16		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / R / 120.0		0.07 ± 0.86
WASP-4b (MEDIUM - TTVs)
2020-09-12		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / R / 120.0		2.66 ± 0.58
WASP-4b (MEDIUM - TTVs)
2020-08-16		Phil Evans
El Sauce		Planewave CDK14
SBIG STT 1603-3 / R / 90.0		0.54 ± 0.58
WASP-4b (MEDIUM - TTVs)
2020-08-16		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / R / 120.0		-0.76 ± 0.58
WASP-4b (MEDIUM - TTVs)
2020-06-06		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / V / 120.0		0.19 ± 0.72
WASP-4b (MEDIUM - TTVs)
2019-12-10		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / V / 120.0		1.77 ± 0.43

Space Observations
Planet
Observation Date		 Mission O-C
minutes
WASP-4b (MEDIUM - TTVs)
2023-09-18		TESS-0.37 ± 0.53
WASP-4b (MEDIUM - TTVs)
2023-09-17		TESS-1.07 ± 0.58
WASP-4b (MEDIUM - TTVs)
2023-09-15		TESS-0.52 ± 0.5
WASP-4b (MEDIUM - TTVs)
2023-09-14		TESS-0.43 ± 0.48
WASP-4b (MEDIUM - TTVs)
2023-09-13		TESS-0.2 ± 0.43
WASP-4b (MEDIUM - TTVs)
2023-09-11		TESS-0.99 ± 0.45
WASP-4b (MEDIUM - TTVs)
2023-09-10		TESS-0.43 ± 0.48
WASP-4b (MEDIUM - TTVs)
2023-09-09		TESS-0.8 ± 0.43
WASP-4b (MEDIUM - TTVs)
2023-09-05		TESS-1.96 ± 0.49
WASP-4b (MEDIUM - TTVs)
2023-09-03		TESS-2.35 ± 0.45
WASP-4b (MEDIUM - TTVs)
2023-09-02		TESS-0.33 ± 0.53
WASP-4b (MEDIUM - TTVs)
2023-09-01		TESS-1.48 ± 0.49
WASP-4b (MEDIUM - TTVs)
2023-08-30		TESS-0.21 ± 0.52
WASP-4b (MEDIUM - TTVs)
2023-08-29		TESS-0.98 ± 0.5
WASP-4b (MEDIUM - TTVs)
2023-08-28		TESS-0.03 ± 0.46
WASP-4b (MEDIUM - TTVs)
2023-08-26		TESS-0.85 ± 0.48
WASP-4b (MEDIUM - TTVs)
2020-09-18		TESS-0.66 ± 0.52
WASP-4b (MEDIUM - TTVs)
2020-09-17		TESS-0.53 ± 0.5
WASP-4b (MEDIUM - TTVs)
2020-09-16		TESS0.07 ± 0.52
WASP-4b (MEDIUM - TTVs)
2020-09-14		TESS0.25 ± 0.43
WASP-4b (MEDIUM - TTVs)
2020-09-13		TESS0.11 ± 0.46
WASP-4b (MEDIUM - TTVs)
2020-09-12		TESS-0.55 ± 0.49
WASP-4b (MEDIUM - TTVs)
2020-09-10		TESS-1.06 ± 0.52
WASP-4b (MEDIUM - TTVs)
2020-09-05		TESS0.25 ± 0.5
WASP-4b (MEDIUM - TTVs)
2020-09-04		TESS0.34 ± 0.53
WASP-4b (MEDIUM - TTVs)
2020-09-02		TESS0.15 ± 0.52
WASP-4b (MEDIUM - TTVs)
2020-09-01		TESS-0.78 ± 0.5
WASP-4b (MEDIUM - TTVs)
2020-08-31		TESS-0.16 ± 0.48
WASP-4b (MEDIUM - TTVs)
2020-08-29		TESS-0.29 ± 0.48
WASP-4b (MEDIUM - TTVs)
2020-08-28		TESS0.2 ± 0.5
WASP-4b (MEDIUM - TTVs)
2020-08-27		TESS-0.89 ± 0.45
WASP-4b (MEDIUM - TTVs)
2020-08-23		TESS-0.51 ± 0.59
WASP-4b (MEDIUM - TTVs)
2020-08-21		TESS-1.36 ± 0.6
WASP-4b (MEDIUM - TTVs)
2020-08-20		TESS0.62 ± 0.68
WASP-4b (MEDIUM - TTVs)
2020-08-19		TESS0.66 ± 0.56
WASP-4b (MEDIUM - TTVs)
2020-08-17		TESS0.43 ± 0.52
WASP-4b (MEDIUM - TTVs)
2020-08-16		TESS-0.33 ± 0.56
WASP-4b (MEDIUM - TTVs)
2020-08-14		TESS-0.99 ± 0.65
WASP-4b (MEDIUM - TTVs)
2020-08-09		TESS-0.68 ± 0.65
WASP-4b (MEDIUM - TTVs)
2020-08-08		TESS0.35 ± 0.62
WASP-4b (MEDIUM - TTVs)
2020-08-06		TESS-0.06 ± 0.62
WASP-4b (MEDIUM - TTVs)
2020-08-05		TESS0.8 ± 0.58
WASP-4b (MEDIUM - TTVs)
2020-08-04		TESS-0.04 ± 0.59
WASP-4b (MEDIUM - TTVs)
2020-08-02		TESS0.37 ± 0.59
WASP-4b (MEDIUM - TTVs)
2020-08-01		TESS-0.49 ± 0.62
WASP-4b (MEDIUM - TTVs)
2018-09-19		TESS-0.26 ± 0.56
WASP-4b (MEDIUM - TTVs)
2018-09-17		TESS0.5 ± 0.48
WASP-4b (MEDIUM - TTVs)
2018-09-16		TESS-0.32 ± 0.5
WASP-4b (MEDIUM - TTVs)
2018-09-15		TESS-0.01 ± 0.5
WASP-4b (MEDIUM - TTVs)
2018-09-13		TESS-0.27 ± 0.46
WASP-4b (MEDIUM - TTVs)
2018-09-12		TESS-0.1 ± 0.5
WASP-4b (MEDIUM - TTVs)
2018-09-11		TESS-0.58 ± 0.55
WASP-4b (MEDIUM - TTVs)
2018-09-09		TESS-0.57 ± 0.48
WASP-4b (MEDIUM - TTVs)
2018-09-08		TESS-0.03 ± 0.49
WASP-4b (MEDIUM - TTVs)
2018-09-04		TESS0.23 ± 0.53
WASP-4b (MEDIUM - TTVs)
2018-09-03		TESS-0.59 ± 0.52
WASP-4b (MEDIUM - TTVs)
2018-09-01		TESS0.21 ± 0.48
WASP-4b (MEDIUM - TTVs)
2018-08-31		TESS-0.47 ± 0.45
WASP-4b (MEDIUM - TTVs)
2018-08-30		TESS-0.75 ± 0.55
WASP-4b (MEDIUM - TTVs)
2018-08-28		TESS0.34 ± 0.45
WASP-4b (MEDIUM - TTVs)
2018-08-27		TESS-0.2 ± 0.45
WASP-4b (MEDIUM - TTVs)
2018-08-26		TESS-0.62 ± 0.53
WASP-4b (MEDIUM - TTVs)
2018-08-24		TESS0.58 ± 0.48

Literature Mid-times
Planet
Observation Date		 Reference O-C
minutes
2022-08-08 Harre et al. 2023 -0.36 ± 0.39
2021-10-14 Harre et al. 2023 -0.88 ± 0.37
2021-09-23 Harre et al. 2023 -0.63 ± 0.32
2021-09-08 Harre et al. 2023 -0.4 ± 0.42
2021-08-31 Harre et al. 2023 -0.69 ± 0.42
2021-08-17 Harre et al. 2023 -0.34 ± 0.4
2021-08-09 Harre et al. 2023 -0.4 ± 0.22
2021-07-15 Harre et al. 2023 -0.59 ± 0.23
2019-06-19 Southworth et al. 2019 -0.14 ± 0.29
2018-08-27 Southworth et al. 2019 0.23 ± 0.12
2018-08-19 Southworth et al. 2019 -0.26 ± 0.14
2018-08-15 Southworth et al. 2019 0.09 ± 0.17
2017-08-28 Southworth et al. 2019 0.23 ± 0.2
2017-08-08 Southworth et al. 2019 0.51 ± 0.26
2016-10-17 Southworth et al. 2019 0.43 ± 0.26
2016-10-13 Southworth et al. 2019 -0.1 ± 0.23
2016-08-25 Southworth et al. 2019 0.1 ± 0.14
2016-08-21 Southworth et al. 2019 -0.07 ± 0.16
2016-08-13 Southworth et al. 2019 0.22 ± 0.14
2015-08-31 Southworth et al. 2019 0.29 ± 0.14
2015-08-27 Southworth et al. 2019 -0.3 ± 0.14
2015-08-23 Southworth et al. 2019 0.1 ± 0.1
2014-09-24 Huitson et al. 2017 0.43 ± 0.09
2013-10-11 Huitson et al. 2017 0.57 ± 0.07
2012-10-16 Huitson et al. 2017 0.43 ± 0.09
2011-10-10 Huitson et al. 2017 0.36 ± 0.13
2011-09-28 Hoyer et al. 2013 0.55 ± 0.6
2011-09-24 Hoyer et al. 2013 0.97 ± 0.6
2011-08-31 Turner et al. 2022 -0.01 ± 0.02
2010-09-29 Hoyer et al. 2013 0.84 ± 0.66
2009-10-28 Hoyer et al. 2013 0.46 ± 0.59
2009-10-08 Nikolov et al. 2012 -0.12 ± 0.11
2009-09-26 Sanchis-Ojeda et al. 2011 -0.1 ± 0.09
2009-09-22 Hoyer et al. 2013 1.36 ± 0.33
2009-08-30 Nikolov et al. 2012 -0.39 ± 0.1
2009-08-26 Nikolov et al. 2012 -0.06 ± 0.12
2009-08-10 Sanchis-Ojeda et al. 2011 -0.13 ± 0.08
2009-08-06 Sanchis-Ojeda et al. 2011 0.09 ± 0.1
2009-08-02 Sanchis-Ojeda et al. 2011 0.18 ± 0.08
2009-07-29 Hoyer et al. 2013 1.03 ± 0.27
2008-10-13 Dragomir et al. 2011 0.08 ± 1.02
2008-10-09 Sanchis-Ojeda et al. 2011 0.02 ± 0.07
2008-10-01 Hoyer et al. 2013 0.33 ± 0.52
2008-10-01 Southworth et al. 2009 -0.33 ± 0.19
2008-09-23 Hoyer et al. 2013 0.48 ± 0.73
2008-09-23 Southworth et al. 2009 -0.7 ± 0.19
2008-09-19 Hoyer et al. 2013 1.05 ± 0.62
2008-08-27 Hoyer et al. 2013 0.21 ± 0.42
2008-08-23 Hoyer et al. 2013 0.7 ± 0.32
2008-08-23 Southworth et al. 2009 -0.21 ± 0.19
2008-08-19 Southworth et al. 2009 -0.24 ± 0.14
2008-08-19 Sanchis-Ojeda et al. 2011 -0.31 ± 0.08
2007-10-23 Gillon et al. 2009 -0.22 ± 0.07
2007-09-27 Gillon et al. 2009 -1.52 ± 0.48
2007-09-25 Gillon et al. 2009 -0.39 ± 0.32
2007-09-22 Wilson et al. 2008 -2.34 ± 0.36
2007-09-21 Gillon et al. 2009 -1.15 ± 1.08
2006-08-15 Gillon et al. 2009 0.02 ± 1.07
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