exoclock

WASP-33b (LOW - TTVs)

Discovered by: Collier Cameron et al. 2010

The Star
Simbad
GAIA
2MASS		 HD 15082
DR2 328636019723252096
J02265106+3733017
RA 02:26:51.0582 DEC +37:33:01.737
Parallax
8.172 mas		 P.M. RA
-0.976 mas/y		 P.M. DEC
-8.977 mas/y
MagV
8.14		 MagR*
7.948		 MagI*
7.806		 MagJ
7.581		 MagH
7.516		 MagK
7.468
MagG
8.07		 MagGBP
8.221		 MagGRP
7.844
*Calculated from GAIA magnitudes.

Ephemeris - Verified True
Kokori et al. 2025
Mid-time
2458518.16266 ± 0.00014 BJDTDB
Period
1.21987081 ± 1.1e-07 days
Transit Parameters
Collier Cameron et al. 2010
Rp/Rs
0.1066 ± 0.0009		 a/Rs**
3.6194 +0.0035 -0.0035
 i
87.7 +1.8 -1.8 deg
e
-		 ω
- deg
DepthR*
14.52 mmag		 Duration*
2.87 hours
*Calculated from the other parameters, using PyLightcurve.
**Adjusted based on the space observations.

Limb Darkening Parameters
Collier Cameron et al. 2010
Teff
7430.0 +100.0 -100.0 K
 Log(g)
4.3 +0.2 -0.2 cm/s2
 Fe/H
0.0 +0.0 -0.0 dex
ExoClock Status
Observing Priority LOW - TTVs
Minimum aperture 5.0"
Total Observations (Recent) 104 (15)
O-C -0.69 ± 0.2 minutes
ExoClock Observations (Recent) 67 (15)
Space Observations (Recent) 27 (0)
ETD Observations (Recent) 0 (0)
Literature Mid-times (Recent) 10 (0)
Kepler Rp/Rs -
TESS Rp/Rs 0.10909 ± 0.0002

WASP-33b


ExoClock Observations
Planet
Observation Date		 Observer
Observatory		 Telescope
Camera / Filter / Exp [s]		 O-C
minutes
WASP-33b (LOW - TTVs)
2025-12-28		Tommaso Dittadi
TD-TRO		Ritchey-Chretien
Moravian G2-1600 / R / 15.0		-5.55 ± 1.87
WASP-33b (LOW - TTVs)
2025-12-15		Lee YuHsien
KMSH Observatory		C14HD
QSI-660 / R / 6.0		-4.0 ± 2.16
WASP-33b (LOW - TTVs)
2025-12-11		Paolo Arcangelo Matassa
P:M.P.H.R. Deep Sky (K81)		Ritchey Chretien 40cm-F5.3
CCD ICX453AQ / R / 15.0		2.16 ± 0.94
WASP-33b (LOW - TTVs)
2025-12-11		Tommaso Dittadi
TD-TRO		Ritchey-Chretien
Moravian G2-1600 / R / 15.0		-2.09 ± 0.89
WASP-33b (LOW - TTVs)
2025-12-06		Anis Ben Lassoued
Sousse Observatory		NEWTON SKY WATCHER
ASI 533 MM / R / 10.0		4.42 ± 1.41
WASP-33b (LOW - TTVs)
2025-12-04		Lee YuHsien
KMSH Observatory		C14HD
QSI-660 / R / 6.0		3.55 ± 2.74
WASP-33b (LOW - TTVs)
2025-11-25		Simon Dawes
William James II		Celestron Edge11 HD
Risingcam Monochrome SONY imx571 / R / 30.0		3.24 ± 1.08
WASP-33b (LOW - TTVs)
2025-11-13		Paolo Arcangelo Matassa
P:M.P.H.R. Deep Sky (K81)		Ritchey Chretien 40cm-F5.3
CCD ICX453AQ / R / 15.0		3.98 ± 1.04
WASP-33b (LOW - TTVs)
2025-11-13		Giovanni Calapai
Home Astronomical Observatory		Celestron 11 Schmidt-Cassegrain
Atik 314L+ / Clear / 90.0		3.16 ± 1.15
WASP-33b (LOW - TTVs)
2025-11-07		Lee YuHsien
KMSH Observatory		C14HD
QSI-660 / R / 5.0		0.46 ± 2.3
WASP-33b (LOW - TTVs)
2025-10-28		Paolo Arcangelo Matassa
P:M.P.H.R. Deep Sky (K81)		Ritchey Chretien 40cm-F5.3
CCD ICX453AQ / R / 15.0		-2.75 ± 1.08
WASP-33b (LOW - TTVs)
2025-10-11		Fabio Filippi
OPLA		Newtonian
Atik 414ex / R / 30.0		3.57 ± 2.45
WASP-33b (LOW - TTVs)
2025-10-05		Lee YuHsien
KMSH Observatory		C14HD
QSI-660 / R / 5.0		6.24 ± 2.3
WASP-33b (LOW - TTVs)
2025-10-02		samuel Diaz Lopez
Tomas Lopez (AstroCamp)		SCA260
ASI2600MM / ipr / 45.0		-3.45 ± 1.41
WASP-33b (LOW - TTVs)
2025-09-01		Kohji Tsumura
Tokyo City University		Vixen VC200L
ZWO ASI 1600MM-PRO / R / 30.0		0.17 ± 2.59
WASP-33b (LOW - TTVs)
2025-01-29		John Collins
JC_Wrexham		Meade LX200GPS
ASI-290m / Lum / 60.0		2.46 ± 1.37
WASP-33b (LOW - TTVs)
2024-12-21		Tommaso Dittadi
TD-TRO		Ritchey-Chretien
Moravian G2-1600 / I / 35.0		-7.86 ± 0.92
WASP-33b (LOW - TTVs)
2024-12-04		Sara Lundqvist
LTU, IRF Kiruna		Celestron cpc 1100 deluxe hd
QHY 174/M GPS / Clear / 15.0		5.81 ± 2.88
WASP-33b (LOW - TTVs)
2024-12-01		Michael Nezel
Celle Observatory		CDK 14
QHY 268M / I / 30.0		3.24 ± 1.58
WASP-33b (LOW - TTVs)
2024-11-29		Patrick Wagner
Balkonien		EvoGuide 50ED
ZWO ASI 1600MM / R / 30.0		2.47 ± 2.45
WASP-33b (LOW - TTVs)
2024-11-29		Benni Sauer
Sternwarte Kornwestheim		Sky Watcher 200/1000 PDS, and Explore Scientific ED APO 127mm f/7,5 FCD-100 CF HEX
ZWO ASI 2600MC Pro, ZWO ASI 120MC S / Clear / 10.0		1.32 ± 1.58
WASP-33b (LOW - TTVs)
2024-11-29		Claudio Lopresti
Claudio Lopresti		Mak-Newton
CCD Sbig ST10xme / I / 180.0		-0.12 ± 1.44
WASP-33b (LOW - TTVs)
2024-11-29		Francesco Scaggiante
Gruppo Astrofili Salese "GALILEO GALILEI"		NEWTON 410/1710
Player One Astronomy Poseidon-M Pro (IMX571) / rpr / 10.0		-1.93 ± 0.98
WASP-33b (LOW - TTVs)
2024-11-28		Alexey Garmash
Lyceum 130		SW Esprit 150ED
ASI1600MM / R / 60.0		-0.03 ± 0.94
WASP-33b (LOW - TTVs)
2024-11-28		Ting-Shuo Yeh
TCFSH Observatory		ASA Telescope 16N 400/1520 Astrograph OTA
Atik One 6.0 / R / 30.0		-11.59 ± 0.98
WASP-33b (LOW - TTVs)
2024-11-06		Shun-Chia Yang
Starry House Observatory		Mewlon 300 CRS
ASI 6200MM Pro / R / 30.0		-0.23 ± 0.84
WASP-33b (LOW - TTVs)
2024-11-01		Pierre Farissier
Astroqueyras		FF 200
Moravian G2 4000 / R / 50.0		0.36 ± 4.61
WASP-33b (LOW - TTVs)
2024-10-12		Michael Nezel
Celle Observatory		CDK 14
QHY 268M / I / 30.0		-0.19 ± 0.46
WASP-33b (LOW - TTVs)
2024-10-05		Moreno Monticelli
OARPAF		Astelco T-800
STX-16801SBIG / R / 21.0		-1.2 ± 1.24
WASP-33b (LOW - TTVs)
2024-10-05		EXOPA TEAM
GAL HASSIN		Galhassin Robotic Telescope
LI ProLine 16803 / rpr / 5.0		-6.39 ± 1.15
WASP-33b (LOW - TTVs)
2024-09-14		David Bennett
Rickford Observatory		GSO RC
ZWO ASI2600MM Pro / R / 25.0		-0.22 ± 0.62
WASP-33b (LOW - TTVs)
2024-09-14		Gerard Tartalo
Dark Energy Observatory		Ts Photoline triplet apo 115/800 F7
Qhy294M pro / rpr / 120.0		-3.49 ± 2.02
WASP-33b (LOW - TTVs)
2024-09-06		Yen-Hsing Lin
Starry House Observatory		Mewlon 300 CRS
ASI 6200MM Pro / R / 30.0		2.22 ± 0.92
WASP-33b (LOW - TTVs)
2023-11-23		Miguel Ángel Álava Amat
Sarriguren		Meade SC 8"
Asi 1600 MM / rpr / 120.0		2.18 ± 2.02
WASP-33b (LOW - TTVs)
2023-11-18		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / R / 10.0		-1.53 ± 0.95
WASP-33b (LOW - TTVs)
2023-11-12		Livia Moretti
Leavitt Observatory		Ritchey-Chrétien 10'' f/8
QHY268 / I / 45.0		1.65 ± 0.99
WASP-33b (LOW - TTVs)
2023-09-29		Francesco Scaggiante
Gruppo Astrofili Salese "GALILEO GALILEI"		NEWTON 410/1710
Player One Astronomy Poseidon-M Pro (IMX571) / R / 10.0		1.87 ± 1.58
WASP-33b (LOW - TTVs)
2023-09-14		Miguel Ángel Álava Amat
Sarriguren		Meade SC 8"
Asi 1600 MM / rpr / 120.0		0.13 ± 0.96
WASP-33b (LOW - TTVs)
2023-09-07		Gunther Fleerackers
gufle		Ritchey-Chrétien
QHY294M / V / 15.0		2.27 ± 1.58
WASP-33b (LOW - TTVs)
2023-09-07		Paolo Arcangelo Matassa
P:M.P.H.R. Deep Sky (K81)		Ritchey Chretien 40cm-F5.3
CCD ICX453AQ / R / 60.0		-2.24 ± 1.43
WASP-33b (LOW - TTVs)
2023-08-06		Paolo Arcangelo Matassa
P:M.P.H.R. Deep Sky (K81)		Ritchey Chretien 40cm-F5.3
CCD ICX453AQ / R / 15.0		-2.03 ± 2.16
WASP-33b (LOW - TTVs)
2023-02-02		Livia Moretti
Leavitt Observatory		Ritchey-Chrétien 10'' f/8
QHY268 / I / 45.0		1.12 ± 1.18
WASP-33b (LOW - TTVs)
2023-02-02		Davide Pica
Private Observatory		Celestron C9.25
ASI 533 MC Pro / Lum / 15.0		0.98 ± 2.45
WASP-33b (LOW - TTVs)
2022-11-22		Simon Dawes
William James II Observatory		Skywatcher MN190 2
ZWO ASI 1600MM-PRO USB 3.0 Mono Camera / R / 30.0		0.11 ± 1.18
WASP-33b (LOW - TTVs)
2022-11-17		John Savage
Rushay Farm Z42		Skywatcher Esprit 150
ZWO ASI 6200MM / R / 10.0		-4.26 ± 1.87
WASP-33b (LOW - TTVs)
2022-11-16		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / V / 120.0		-3.58 ± 2.3
WASP-33b (LOW - TTVs)
2022-11-05		Claudio Lopresti
Claudio Lopresti		Mak-Newton
CCD Sbig ST10xme / R / 180.0		2.07 ± 1.08
WASP-33b (LOW - TTVs)
2022-10-31		Claudio Lopresti
Claudio Lopresti		Mak-Newton
CCD Sbig ST10xme / R / 180.0		2.09 ± 0.73
WASP-33b (LOW - TTVs)
2022-10-31		Fabio Mortari
Hypatia Observatory		Ritchey Chretienne 250mm f/5.3
MORAVIAN C2-7000A / R / 50.0		-0.83 ± 1.12
WASP-33b (LOW - TTVs)
2022-10-25		Lorenzo Betti
Osservatorio Polifunzionale del Chianti		RC-80cm
Moravian G4 - KAF 09000 / R / 20.0		2.44 ± 0.78
WASP-33b (LOW - TTVs)
2022-10-16		Esteban García N.
Paraje Corral de Ricardo, Enguidanos.		Sky-Watcher CF254
ATIK 314 L+, Monocrome / R / 60.0		-2.52 ± 2.45
WASP-33b (LOW - TTVs)
2022-10-09		Stéphane Montchaud
Burgundy Observatory		Celestron 8
Zwo Asi 1600 / R / 30.0		0.01 ± 1.44
WASP-33b (LOW - TTVs)
2022-10-05		Eric Miny
BLOIS SOLOGNE ASTRONOMIE OBSERVATORY		Newton T305
QSI 683WS / R / 20.0		3.3 ± 1.22
WASP-33b (LOW - TTVs)
2022-09-17		Efrem Frigeni
Resegone Observatory		Corrected Cassegrain CCA
C3-26000 / rpr / 45.0		-1.44 ± 1.11
WASP-33b (LOW - TTVs)
2022-09-17		Didier Walliang
Observatoire de la Société Lorraine d'Astronomie		ASA 10N
ASI 183 MM pro / R / 15.0		-1.51 ± 0.94
WASP-33b (LOW - TTVs)
2022-09-17		Albino Carbognani
Loiano Home		Schmidt-Cassegrain
ASI 178 mm cooled / Clear / 5.0		-5.07 ± 2.45
WASP-33b (LOW - TTVs)
2022-08-27		Vojtěch Školník
Hvezdarna Valasske Mezirici		Meade LX90 ACF
MI C2-7000A / V / 45.0		2.69 ± 1.38
WASP-33b (LOW - TTVs)
2022-08-05		Robert Roth
TURMX Observatory		Planewave CDK17
QHY600M / rpr / 60.0		1.86 ± 1.3
WASP-33b (LOW - TTVs)
2022-02-23		Marc Serrau
A77 Dauban		Celestron 11
ST8-XME / R / 60.0		3.38 ± 1.87
WASP-33b (LOW - TTVs)
2019-12-28		Manfred Raetz
privat observatory Herges-Hallenberg		SCT 280 /1790 (Celestron C11 with reducer)
Moravian Instruments G2-1600 / R / 15.0		1.85 ± 0.71
WASP-33b (LOW - TTVs)
2019-10-30		Manfred Raetz
privat observatory Herges-Hallenberg		SCT 280 /1790 (Celestron C11 with reducer)
Moravian Instruments G2-1600 / R / 60.0		1.8 ± 0.75
WASP-33b (LOW - TTVs)
2017-11-17		Ulisse Quadri
Bassano Bresciano Observatory		Newton
QHY 268M / Clear / 240.0		0.5 ± 4.03
WASP-33b (LOW - TTVs)
2016-12-03		Manfred Raetz
privat observatory Herges-Hallenberg		SCT 203/1260 (Meade 8" with reducer)
Moravian Instruments G2-1600 / R / 30.0		-3.22 ± 0.86
WASP-33b (LOW - TTVs)
2016-09-12		Manfred Raetz
privat observatory Herges-Hallenberg		SCT 203/1260 (Meade 8" with reducer)
Moravian Instruments G2-1600 / R / 60.0		1.27 ± 0.66
WASP-33b (LOW - TTVs)
2015-11-01		Manfred Raetz
privat observatory Herges-Hallenberg		SCT 203/1260 (Meade 8" with reducer)
Moravian Instruments G2-1600 / V / 60.0		-2.19 ± 1.14
WASP-33b (LOW - TTVs)
2012-11-01		Ramon Naves
Montcabrer		Meade LX200 12" ACF
Sbig ST8xme / R / 120.0		-1.56 ± 1.21
WASP-33b (LOW - TTVs)
2010-10-20		Claudio Lopresti
Claudio Lopresti		Meade LX200 12"
CCD Sbig ST9xe / R / 20.0		-1.45 ± 0.78

Space Observations
Planet
Observation Date		 Mission O-C
minutes
WASP-33b (LOW - TTVs)
2022-11-25		TESS1.58 ± 0.48
WASP-33b (LOW - TTVs)
2022-11-24		TESS-1.16 ± 0.42
WASP-33b (LOW - TTVs)
2022-11-22		TESS1.03 ± 0.56
WASP-33b (LOW - TTVs)
2022-11-20		TESS-0.1 ± 0.56
WASP-33b (LOW - TTVs)
2022-11-19		TESS1.17 ± 0.5
WASP-33b (LOW - TTVs)
2022-11-17		TESS0.38 ± 0.42
WASP-33b (LOW - TTVs)
2022-11-16		TESS-0.63 ± 0.46
WASP-33b (LOW - TTVs)
2022-11-14		TESS0.96 ± 0.56
WASP-33b (LOW - TTVs)
2022-11-11		TESS-0.37 ± 0.55
WASP-33b (LOW - TTVs)
2022-11-10		TESS-0.13 ± 0.56
WASP-33b (LOW - TTVs)
2022-11-09		TESS0.49 ± 0.56
WASP-33b (LOW - TTVs)
2022-11-07		TESS0.78 ± 0.48
WASP-33b (LOW - TTVs)
2022-11-05		TESS0.76 ± 0.39
WASP-33b (LOW - TTVs)
2022-11-03		TESS0.1 ± 0.45
WASP-33b (LOW - TTVs)
2022-11-02		TESS0.45 ± 0.53
WASP-33b (LOW - TTVs)
2022-10-31		TESS1.39 ± 0.45
WASP-33b (LOW - TTVs)
2022-10-30		TESS0.48 ± 0.6
WASP-33b (LOW - TTVs)
2019-11-24		TESS0.87 ± 0.53
WASP-33b (LOW - TTVs)
2019-11-23		TESS1.06 ± 0.46
WASP-33b (LOW - TTVs)
2019-11-22		TESS0.31 ± 0.43
WASP-33b (LOW - TTVs)
2019-11-20		TESS1.46 ± 0.42
WASP-33b (LOW - TTVs)
2019-11-18		TESS-0.19 ± 0.39
WASP-33b (LOW - TTVs)
2019-11-16		TESS-1.11 ± 0.56
WASP-33b (LOW - TTVs)
2019-11-11		TESS0.6 ± 0.48
WASP-33b (LOW - TTVs)
2019-11-10		TESS0.24 ± 0.39
WASP-33b (LOW - TTVs)
2019-11-08		TESS-0.51 ± 0.3
WASP-33b (LOW - TTVs)
2019-11-07		TESS1.05 ± 0.29

Literature Mid-times
Planet
Observation Date		 Reference O-C
minutes
2019-11-17 Cauley et al. 2021 4.18 ± 0.72
2019-11-05 von Essen et al. 2020 0.63 ± 0.13
2018-10-11 Watanabe et al. 2022 -3.55 ± 0.2
2017-11-05 Watanabe et al. 2022 -2.62 ± 0.22
2014-10-04 Nugroho et al. 2017 1.66 ± 0.72
2012-04-12 Zhang et al. 2018 0.87 ± 0.23
2010-11-07 von Essen et al. 2015 1.01 ± 0.43
2010-08-23 Herrero et al. 2011 -2.32 ± 0.43
2008-05-03 Smith et al. 2011 2.3 ± 0.4
2003-12-11 Turner et al. 2016 1.35 ± 0.43
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