exoclock

WASP-121b (MEDIUM)

Discovered by: Delrez et al. 2016

The Star
Simbad
GAIA
2MASS		 CD-38 3220
DR2 5565050255701441664
J07102406-3905506
RA 07:10:24.0606 DEC -39:05:50.570
Parallax
3.676 mas		 P.M. RA
-3.848 mas/y		 P.M. DEC
25.606 mas/y
MagV
10.51		 MagR*
10.195		 MagI*
9.984		 MagJ
9.625		 MagH
9.439		 MagK
9.374
MagG
10.375		 MagGBP
10.623		 MagGRP
10.015
*Calculated from GAIA magnitudes.

Ephemeris - Verified True
Kokori et al. 2025
Mid-time
2458629.690691 ± 2.6e-05 BJDTDB
Period
1.274924794 ± 3.5e-08 days
Transit Parameters
Delrez et al. 2016
Rp/Rs
0.1245 ± 0.0005		 a/Rs
3.754 +0.023 -0.028
 i
87.6 +0.6 -0.6 deg
e
-		 ω
- deg
DepthR*
20.3 mmag		 Duration*
2.94 hours
*Calculated from the other parameters, using PyLightcurve.
**Adjusted based on the space observations.

Limb Darkening Parameters
Delrez et al. 2016
Teff
6459.0 +140.0 -140.0 K
 Log(g)
4.24 +0.01 -0.01 cm/s2
 Fe/H
0.13 +0.09 -0.09 dex
ExoClock Status
Observing Priority MEDIUM
Minimum aperture 5.0"
Total Observations (Recent) 89 (3)
O-C 1.11 ± 0.21 minutes
ExoClock Observations (Recent) 16 (3)
Space Observations (Recent) 67 (0)
ETD Observations (Recent) 0 (0)
Literature Mid-times (Recent) 6 (0)
Kepler Rp/Rs -
TESS Rp/Rs 0.120506 ± 9.5e-05

WASP-121b


ExoClock Observations
Planet
Observation Date		 Observer
Observatory		 Telescope
Camera / Filter / Exp [s]		 O-C
minutes
WASP-121b (MEDIUM)
2025-03-14		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / R / 45.0		-1.6 ± 0.6
WASP-121b (MEDIUM)
2025-02-19		Jean-Pascal Vignes
Deep Sky Chile		Planewave CDK400
QHYCCD 600M / Lum / 30.0		0.95 ± 0.46
WASP-121b (MEDIUM)
2025-02-19		Francois Regembal
HRT Deep Sky Chile		Astrosib RC360
Moravian C3 PRO 61000 / Lum / 85.0		0.6 ± 1.2
WASP-121b (MEDIUM)
2024-12-21		Jean-Pascal Vignes
Deep Sky Chile		Planewave CDK400
QHYCCD 600M / Lum / 30.0		1.69 ± 0.26
WASP-121b (MEDIUM)
2023-12-11		Jean-Pascal Vignes
Deep Sky Chile		Planewave CDK400
QHYCCD 600M / Lum / 30.0		-0.54 ± 1.58
WASP-121b (MEDIUM)
2023-12-02		Francois Regembal
HRT Deep Sky Chile		Astrosib RC360
Moravian C3 PRO 61000 / Lum / 90.0		0.26 ± 1.17
WASP-121b (MEDIUM)
2023-11-18		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / R / 120.0		0.12 ± 0.73
WASP-121b (MEDIUM)
2023-04-09		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / R / 60.0		1.07 ± 0.53
WASP-121b (MEDIUM)
2022-11-03		Jean-Pascal Vignes
Deep Sky Chile		Planewave CDK400
QHYCCD 600M / R / 45.0		0.19 ± 0.59
WASP-121b (MEDIUM)
2022-02-02		Anaël Wünsche
El Sauce Observatory		CDK Planewave Chili
Moravian G4 16k / R / 120.0		2.44 ± 0.58
WASP-121b (MEDIUM)
2022-01-24		Anaël Wünsche
El Sauce Observatory		CDK Planewave Chili
Moravian G4 16k / R / 120.0		-1.2 ± 0.72
WASP-121b (MEDIUM)
2021-03-28		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / R / 120.0		0.49 ± 0.58
WASP-121b (MEDIUM)
2021-03-05		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / R / 120.0		0.99 ± 0.58
WASP-121b (MEDIUM)
2020-12-30		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / R / 120.0		-0.21 ± 0.86
WASP-121b (MEDIUM)
2020-12-07		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / R / 60.0		-0.43 ± 0.72
WASP-121b (MEDIUM)
2020-11-14		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / R / 60.0		-0.22 ± 1.01

Space Observations
Planet
Observation Date		 Mission O-C
minutes
WASP-121b (MEDIUM)
2023-02-11		TESS0.25 ± 0.37
WASP-121b (MEDIUM)
2023-02-10		TESS-0.18 ± 0.36
WASP-121b (MEDIUM)
2023-02-09		TESS0.06 ± 0.35
WASP-121b (MEDIUM)
2023-02-08		TESS0.24 ± 0.36
WASP-121b (MEDIUM)
2023-02-05		TESS-0.09 ± 0.39
WASP-121b (MEDIUM)
2023-02-04		TESS-0.14 ± 0.35
WASP-121b (MEDIUM)
2023-02-01		TESS0.46 ± 0.37
WASP-121b (MEDIUM)
2023-01-30		TESS0.23 ± 0.35
WASP-121b (MEDIUM)
2023-01-28		TESS-0.25 ± 0.35
WASP-121b (MEDIUM)
2023-01-27		TESS-0.42 ± 0.3
WASP-121b (MEDIUM)
2023-01-26		TESS0.69 ± 0.35
WASP-121b (MEDIUM)
2023-01-23		TESS-0.19 ± 0.39
WASP-121b (MEDIUM)
2023-01-22		TESS0.42 ± 0.39
WASP-121b (MEDIUM)
2023-01-21		TESS-0.19 ± 0.35
WASP-121b (MEDIUM)
2023-01-20		TESS-0.19 ± 0.35
WASP-121b (MEDIUM)
2021-02-07		TESS0.41 ± 0.4
WASP-121b (MEDIUM)
2021-02-06		TESS0.06 ± 0.36
WASP-121b (MEDIUM)
2021-02-05		TESS-0.09 ± 0.37
WASP-121b (MEDIUM)
2021-02-03		TESS-0.02 ± 0.35
WASP-121b (MEDIUM)
2021-02-02		TESS-0.5 ± 0.36
WASP-121b (MEDIUM)
2021-02-01		TESS-0.06 ± 0.36
WASP-121b (MEDIUM)
2021-01-30		TESS0.06 ± 0.35
WASP-121b (MEDIUM)
2021-01-29		TESS-0.61 ± 0.36
WASP-121b (MEDIUM)
2021-01-28		TESS0.22 ± 0.37
WASP-121b (MEDIUM)
2021-01-25		TESS0.06 ± 0.32
WASP-121b (MEDIUM)
2021-01-24		TESS-0.78 ± 0.36
WASP-121b (MEDIUM)
2021-01-23		TESS0.05 ± 0.32
WASP-121b (MEDIUM)
2021-01-22		TESS-0.28 ± 0.32
WASP-121b (MEDIUM)
2021-01-20		TESS-0.1 ± 0.35
WASP-121b (MEDIUM)
2021-01-19		TESS-0.28 ± 0.3
WASP-121b (MEDIUM)
2021-01-18		TESS0.03 ± 0.35
WASP-121b (MEDIUM)
2021-01-16		TESS-0.28 ± 0.32
WASP-121b (MEDIUM)
2021-01-15		TESS0.33 ± 0.33
WASP-121b (MEDIUM)
2021-01-11		TESS-0.55 ± 0.35
WASP-121b (MEDIUM)
2021-01-10		TESS-0.03 ± 0.33
WASP-121b (MEDIUM)
2021-01-09		TESS-0.02 ± 0.32
WASP-121b (MEDIUM)
2021-01-08		TESS-0.03 ± 0.35
WASP-121b (MEDIUM)
2021-01-06		TESS0.6 ± 0.37
WASP-121b (MEDIUM)
2021-01-05		TESS-0.56 ± 0.36
WASP-121b (MEDIUM)
2021-01-04		TESS0.06 ± 0.32
WASP-121b (MEDIUM)
2021-01-02		TESS0.13 ± 0.32
WASP-121b (MEDIUM)
2021-01-01		TESS0.8 ± 0.35
WASP-121b (MEDIUM)
2020-12-30		TESS-0.05 ± 0.32
WASP-121b (MEDIUM)
2020-12-28		TESS-0.02 ± 0.35
WASP-121b (MEDIUM)
2020-12-27		TESS-0.28 ± 0.35
WASP-121b (MEDIUM)
2020-12-26		TESS0.2 ± 0.35
WASP-121b (MEDIUM)
2020-12-25		TESS-0.64 ± 0.33
WASP-121b (MEDIUM)
2020-12-23		TESS0.49 ± 0.36
WASP-121b (MEDIUM)
2020-12-22		TESS-0.08 ± 0.33
WASP-121b (MEDIUM)
2020-12-21		TESS0.11 ± 0.36
WASP-121b (MEDIUM)
2020-12-19		TESS0.46 ± 0.35
WASP-121b (MEDIUM)
2020-12-18		TESS-0.48 ± 0.3
WASP-121b (MEDIUM)
2019-01-31		TESS0.55 ± 0.39
WASP-121b (MEDIUM)
2019-01-30		TESS-0.17 ± 0.35
WASP-121b (MEDIUM)
2019-01-28		TESS-0.46 ± 0.36
WASP-121b (MEDIUM)
2019-01-27		TESS0.08 ± 0.35
WASP-121b (MEDIUM)
2019-01-26		TESS0.13 ± 0.35
WASP-121b (MEDIUM)
2019-01-25		TESS0.38 ± 0.37
WASP-121b (MEDIUM)
2019-01-23		TESS-0.76 ± 0.36
WASP-121b (MEDIUM)
2019-01-22		TESS-0.17 ± 0.35
WASP-121b (MEDIUM)
2019-01-18		TESS-0.29 ± 0.36
WASP-121b (MEDIUM)
2019-01-16		TESS-0.23 ± 0.33
WASP-121b (MEDIUM)
2019-01-14		TESS-0.5 ± 0.35
WASP-121b (MEDIUM)
2019-01-13		TESS-0.45 ± 0.33
WASP-121b (MEDIUM)
2019-01-12		TESS-0.01 ± 0.35
WASP-121b (MEDIUM)
2019-01-11		TESS0.51 ± 0.39
WASP-121b (MEDIUM)
2019-01-08		TESS0.15 ± 0.33

Literature Mid-times
Planet
Observation Date		 Reference O-C
minutes
2016-11-12 Evans et al. 2018 0.32 ± 0.26
2016-11-06 Evans et al. 2018 0.78 ± 0.32
2016-10-24 Evans et al. 2018 -0.36 ± 0.3
2016-07-30 Sing et al. 2019 0.03 ± 0.07
2016-02-06 Tsiaras et al. 2018 -0.12 ± 0.17
2013-12-09 Delrez et al. 2016 0.02 ± 0.16
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