exoclock

WASP-20b (HIGH)

Discovered by: Anderson et al. 2015

The Star
Simbad
GAIA
2MASS		 CD-24 102
DR2 2359978293136820864
J00203853-2356086
RA 00:20:38.5321 DEC -23:56:08.793
Parallax
-1.879 mas		 P.M. RA
2.466 mas/y		 P.M. DEC
-3.105 mas/y
MagV
10.779		 MagR*
10.439		 MagI*
10.119		 MagJ
9.701		 MagH
9.417		 MagK
9.39
MagG
10.65		 MagGBP
10.965		 MagGRP
10.2
*Calculated from GAIA magnitudes.

Ephemeris - Verified True
Kokori et al. 2025
Mid-time
2458562.35009 ± 0.00014 BJDTDB
Period
4.89964519 ± 4.6e-07 days
Transit Parameters
Evans et al. 2016
Rp/Rs
0.101 ± 0.005		 a/Rs**
10.6 +0.08 -0.08
 i
86.8 +0.9 -0.9 deg
e
-		 ω
- deg
DepthR*
12.25 mmag		 Duration*
3.29 hours
*Calculated from the other parameters, using PyLightcurve.
**Adjusted based on the space observations.

Limb Darkening Parameters
Anderson et al. 2015
Teff
5940.0 +100.0 -100.0 K
 Log(g)
4.23 +0.02 -0.02 cm/s2
 Fe/H
-0.01 +0.06 -0.06 dex
ExoClock Status
Observing Priority HIGH
Minimum aperture 5.0"
Total Observations (Recent) 27 (1)
O-C -0.29 ± 0.86 minutes
ExoClock Observations (Recent) 11 (1)
Space Observations (Recent) 14 (0)
ETD Observations (Recent) 1 (0)
Literature Mid-times (Recent) 1 (0)
Kepler Rp/Rs -
TESS Rp/Rs 0.09721 ± 0.00027

WASP-20b


ExoClock Observations
Planet
Observation Date		 Observer
Observatory		 Telescope
Camera / Filter / Exp [s]		 O-C
minutes
WASP-20b (HIGH)
2025-11-08		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / R / 45.0		2.22 ± 1.44
WASP-20b (HIGH)
2024-10-17		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / R / 90.0		-1.7 ± 1.08
WASP-20b (HIGH)
2023-11-04		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / R / 60.0		-3.05 ± 1.41
WASP-20b (HIGH)
2023-09-21		Anaël Wünsche
El Sauce Observatory		CDK Planewave Chili
Moravian G4 16k / R / 120.0		0.9 ± 2.16
WASP-20b (HIGH)
2022-08-20		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / R / 120.0		5.31 ± 2.45
WASP-20b (HIGH)
2021-09-16		Lea Changeat
El Sauce		Planewave CDK24
FLI ProLine PL9000 / R / 30.0		-1.29 ± 1.15
WASP-20b (HIGH)
2021-09-16		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / R / 60.0		-2.3 ± 1.87
WASP-20b (HIGH)
2020-08-30		Carmelo Falco
GALHassin Robotic Telescope 2 (GRT2)		Giacometti-Fogale RC16
Andor Apogee Aspen CG16M / Lum / 45.0		-2.69 ± 2.3
WASP-20b (HIGH)
2020-08-20		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / R / 120.0		2.33 ± 1.44
WASP-20b (HIGH)
2020-08-20		Phil Evans
El Sauce		Planewave CDK14
SBIG STT 1603-3 / R / 50.0		-3.43 ± 2.74
WASP-20b (HIGH)
2020-08-15		Phil Evans
El Sauce		Planewave CDK14
SBIG STT 1603-3 / R / 90.0		1.39 ± 1.15

Space Observations
Planet
Observation Date		 Mission O-C
minutes
WASP-20b (HIGH)
2023-09-16		TESS0.45 ± 0.72
WASP-20b (HIGH)
2023-09-11		TESS0.27 ± 0.68
WASP-20b (HIGH)
2023-09-01		TESS1.15 ± 0.65
WASP-20b (HIGH)
2023-08-27		TESS-0.05 ± 0.91
WASP-20b (HIGH)
2020-09-18		TESS0.79 ± 0.76
WASP-20b (HIGH)
2020-09-13		TESS-0.84 ± 0.71
WASP-20b (HIGH)
2020-09-03		TESS-0.67 ± 0.75
WASP-20b (HIGH)
2020-08-30		TESS-0.39 ± 0.66
WASP-20b (HIGH)
2018-09-19		TESS-0.82 ± 0.82
WASP-20b (HIGH)
2018-09-14		TESS-0.75 ± 0.66
WASP-20b (HIGH)
2018-09-09		TESS-0.44 ± 0.66
WASP-20b (HIGH)
2018-09-04		TESS1.18 ± 0.78
WASP-20b (HIGH)
2018-08-30		TESS-0.6 ± 0.66
WASP-20b (HIGH)
2018-08-26		TESS0.77 ± 0.69

ETD Observations
Planet
Observation Date		 Observer(s) ETD link O-C
minutes
WASP-20b (HIGH)
2014-09-20		Phil Evans1411246275-2.81 ± 5.76

Literature Mid-times
Planet
Observation Date		 Reference O-C
minutes
2011-06-03 Anderson et al. 2015 0.22 ± 0.4
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