exoclock

WASP-140b (MEDIUM)

Discovered by: Hellier et al. 2017

The Star
Simbad
GAIA
2MASS		 BD-20 761
DR2 5094154336330994688
J04013254-2027039
RA 04:01:32.5498 DEC -20:27:03.910
Parallax
8.475 mas		 P.M. RA
-18.665 mas/y		 P.M. DEC
20.276 mas/y
MagV
11.12		 MagR*
10.576		 MagI*
10.265		 MagJ
9.609		 MagH
9.24		 MagK
9.165
MagG
10.82		 MagGBP
11.251		 MagGRP
10.263
*Calculated from GAIA magnitudes.

Ephemeris - Verified True
Kokori et al. 2025
Mid-time
2458546.856513 ± 6.9e-05 BJDTDB
Period
2.2359844 ± 2.5e-07 days
Transit Parameters
Hellier et al. 2017
Rp/Rs
0.1432 ± 0.007		 a/Rs**
7.94 +0.12 -0.12
 i
83.3 +0.5 -0.8 deg
e
0.047 +0.004 -0.004
 ω
356.0 +8.0 -8.0 deg
DepthR*
14.06 mmag		 Duration*
1.45 hours
*Calculated from the other parameters, using PyLightcurve.
**Adjusted based on the space observations.

Limb Darkening Parameters
Hellier et al. 2017
Teff
5260.0 +100.0 -100.0 K
 Log(g)
4.51 +0.04 -0.04 cm/s2
 Fe/H
0.12 +0.1 -0.1 dex
ExoClock Status
Observing Priority MEDIUM
Minimum aperture 5.0"
Total Observations (Recent) 46 (2)
O-C -0.62 ± 0.29 minutes
ExoClock Observations (Recent) 15 (2)
Space Observations (Recent) 29 (0)
ETD Observations (Recent) 0 (0)
Literature Mid-times (Recent) 2 (0)
Kepler Rp/Rs -
TESS Rp/Rs 0.17814 ± 0.00041

WASP-140b


ExoClock Observations
Planet
Observation Date		 Observer
Observatory		 Telescope
Camera / Filter / Exp [s]		 O-C
minutes
WASP-140b (MEDIUM)
2025-11-24		Hao-Yuan Duan
Lulin Observatory, Taiwan		GSO RC12
ASI 294MM Pro / R / 20.0		2.64 ± 1.58
WASP-140b (MEDIUM)
2025-11-20		Darryl Madison
Ajijic Observatory		Celestron CPC 800 Edge HD
ZWO2400MC / Clear / 90.0		-2.59 ± 1.58
WASP-140b (MEDIUM)
2024-12-01		Claudio Lopresti
Claudio Lopresti		Mak-Newton
CCD Sbig ST10xme / I / 240.0		-0.24 ± 2.16
WASP-140b (MEDIUM)
2024-09-01		Raylan Ari Prestes Martins
Pico dos Dias		B&C
Ikon 23777 / R / 15.0		-0.67 ± 0.3
WASP-140b (MEDIUM)
2024-01-21		Vikrant Kumar Agnihotri
Cepheid Observatory India		GSO Ritchey–Chrétien
Atik383L+ mono / Lum / 60.0		-2.11 ± 1.12
WASP-140b (MEDIUM)
2023-11-29		Gustavo Muler
Obs. Nazaret J47		lx 200
ST8 XME AO8 / R / 45.0		0.56 ± 0.65
WASP-140b (MEDIUM)
2023-11-11		Gustavo Muler
Obs. Nazaret J47		lx 200
ST8 XME AO8 / R / 60.0		-2.18 ± 0.86
WASP-140b (MEDIUM)
2022-12-15		Andre Kovacs
Observatório Pico dos Dias (OPD)		0.6 m Boller & Chivens f/6.75
Andor iKon-L 936 CCD / R / 25.0		-0.33 ± 0.6
WASP-140b (MEDIUM)
2022-12-15		Jean-Pascal Vignes
Deep Sky Chile		Planewave CDK400
QHYCCD 600M / R / 60.0		-2.39 ± 0.82
WASP-140b (MEDIUM)
2022-10-29		Anaël Wünsche
El Sauce Observatory		CDK Planewave Chili
Moravian G4 16k / R / 120.0		3.6 ± 1.58
WASP-140b (MEDIUM)
2021-11-30		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / R / 120.0		-0.9 ± 0.72
WASP-140b (MEDIUM)
2021-01-03		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / R / 120.0		1.25 ± 0.58
WASP-140b (MEDIUM)
2020-12-07		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / R / 40.0		-0.61 ± 1.44
WASP-140b (MEDIUM)
2020-11-26		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / R / 40.0		-2.3 ± 0.58
WASP-140b (MEDIUM)
2020-02-25		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / V / 120.0		1.27 ± 1.3

Space Observations
Planet
Observation Date		 Mission O-C
minutes
WASP-140b (MEDIUM)
2020-11-14		TESS0.03 ± 0.36
WASP-140b (MEDIUM)
2020-11-12		TESS-0.09 ± 0.43
WASP-140b (MEDIUM)
2020-11-10		TESS-0.69 ± 0.46
WASP-140b (MEDIUM)
2020-11-08		TESS-0.7 ± 0.45
WASP-140b (MEDIUM)
2020-11-06		TESS0.2 ± 0.35
WASP-140b (MEDIUM)
2020-11-01		TESS0.73 ± 0.45
WASP-140b (MEDIUM)
2020-10-30		TESS0.45 ± 0.4
WASP-140b (MEDIUM)
2020-10-28		TESS0.43 ± 0.42
WASP-140b (MEDIUM)
2020-10-25		TESS-0.36 ± 0.43
WASP-140b (MEDIUM)
2020-10-23		TESS0.98 ± 0.43
WASP-140b (MEDIUM)
2018-12-09		TESS-0.84 ± 0.37
WASP-140b (MEDIUM)
2018-12-07		TESS-0.41 ± 0.4
WASP-140b (MEDIUM)
2018-12-04		TESS1.56 ± 0.45
WASP-140b (MEDIUM)
2018-12-02		TESS-0.36 ± 0.36
WASP-140b (MEDIUM)
2018-11-30		TESS-0.03 ± 0.43
WASP-140b (MEDIUM)
2018-11-25		TESS-0.46 ± 0.46
WASP-140b (MEDIUM)
2018-11-23		TESS0.21 ± 0.39
WASP-140b (MEDIUM)
2018-11-21		TESS0.37 ± 0.46
WASP-140b (MEDIUM)
2018-11-19		TESS-0.08 ± 0.39
WASP-140b (MEDIUM)
2018-11-17		TESS0.16 ± 0.43
WASP-140b (MEDIUM)
2018-11-12		TESS0.04 ± 0.43
WASP-140b (MEDIUM)
2018-11-10		TESS0.12 ± 0.39
WASP-140b (MEDIUM)
2018-11-08		TESS0.6 ± 0.45
WASP-140b (MEDIUM)
2018-11-05		TESS-0.42 ± 0.43
WASP-140b (MEDIUM)
2018-11-03		TESS-0.6 ± 0.42
WASP-140b (MEDIUM)
2018-10-30		TESS0.13 ± 0.43
WASP-140b (MEDIUM)
2018-10-25		TESS-0.2 ± 0.46
WASP-140b (MEDIUM)
2018-10-23		TESS-0.62 ± 0.4
WASP-140b (MEDIUM)
2018-10-21		TESS0.55 ± 0.42

Literature Mid-times
Planet
Observation Date		 Reference O-C
minutes
2019-01-02 May et al. 2022 0.24 ± 0.18
2014-09-11 Hellier et al. 2017 -0.08 ± 0.22
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