exoclock

HAT-P-20b (LOW)

Discovered by: Bakos et al. 2011

The Star
Simbad
GAIA
2MASS		 HAT-P-20
DR2 869913435026514688
J07273995+2420118
RA 07:27:39.9487 DEC +24:20:11.518
Parallax
14.048 mas		 P.M. RA
-4.985 mas/y		 P.M. DEC
-96.235 mas/y
MagV
11.35		 MagR
11.0		 MagI*
10.088		 MagJ
9.276		 MagH
8.743		 MagK
8.601
MagG
10.99		 MagGBP
11.665		 MagGRP
10.235
*Calculated from GAIA magnitudes.

Ephemeris - Verified True
Kokori et al. 2025
Mid-time
2458304.158616 ± 4.8e-05 BJDTDB
Period
2.875317895 ± 8.6e-08 days
Transit Parameters
Bakos et al. 2011
Rp/Rs
0.1284 ± 0.0016		 a/Rs
11.2 +0.3 -0.3
 i
86.8 +0.2 -0.2 deg
e
0.015 +0.005 -0.005
 ω
317.0 +130.0 -130.0 deg
DepthR*
19.78 mmag		 Duration*
1.86 hours
*Calculated from the other parameters, using PyLightcurve.
**Adjusted based on the space observations.

Limb Darkening Parameters
Bakos et al. 2011
Teff
4595.0 +80.0 -80.0 K
 Log(g)
4.63 +0.02 -0.02 cm/s2
 Fe/H
0.35 +0.08 -0.08 dex
ExoClock Status
Observing Priority LOW
Minimum aperture 5.0"
Total Observations (Recent) 133 (10)
O-C 0.22 ± 0.19 minutes
ExoClock Observations (Recent) 76 (10)
Space Observations (Recent) 34 (0)
ETD Observations (Recent) 0 (0)
Literature Mid-times (Recent) 23 (0)
Kepler Rp/Rs -
TESS Rp/Rs 0.14243 ± 0.0002

HAT-P-20b


ExoClock Observations
Planet
Observation Date		 Observer
Observatory		 Telescope
Camera / Filter / Exp [s]		 O-C
minutes
HAT-P-20b (LOW)
2026-04-05		giulio follero
OPLA		Celestron C11
Atik 414ex / Clear / 60.0		-1.47 ± 1.11
HAT-P-20b (LOW)
2026-04-05		Paolo Arcangelo Matassa
P:M.P.H.R. Deep Sky (K81)		Ritchey Chretien 40cm-F5.3
CCD ICX453AQ / Lum / 60.0		-3.59 ± 1.25
HAT-P-20b (LOW)
2026-02-18		Ana Atanasova
ANI		skywathcher
zwo asi 585 mm pro / R / 60.0		3.53 ± 0.89
HAT-P-20b (LOW)
2026-01-26		Claudio Lopresti
Claudio Lopresti		Mak-Newton
CCD Sbig ST10xme / I / 240.0		1.85 ± 1.73
HAT-P-20b (LOW)
2025-12-31		Tommaso Dittadi
TD-TRO		Ritchey-Chretien
Moravian G2-1600 / I / 90.0		-1.53 ± 0.71
HAT-P-20b (LOW)
2025-12-29		Fabio Mortari
Hypatia Observatory		Ritchey Chretienne 250mm f/5.6
Moravian G2-8300 / R / 150.0		0.96 ± 2.3
HAT-P-20b (LOW)
2025-12-08		Tommaso Dittadi
TD-TRO		Ritchey-Chretien
Moravian G2-1600 / R / 90.0		-0.14 ± 0.78
HAT-P-20b (LOW)
2025-12-08		Ramon Naves
Montcabrer		Meade LX200 12" ACF
Moravian G4-9000 / rpr / 100.0		-0.73 ± 2.59
HAT-P-20b (LOW)
2025-12-08		Matthieu Bachschmidt
Gonachon		Celestron C11
SBIG ST8XME / AstrodonExoPlanet-BB / 60.0		-1.87 ± 1.18
HAT-P-20b (LOW)
2025-11-13		Giovanni Calapai
Home Astronomical Observatory		Celestron 11 Schmidt-Cassegrain
Atik 314L+ / Clear / 90.0		-0.57 ± 1.28
HAT-P-20b (LOW)
2025-03-30		José Luis Hernández Verdejo
José L. Hernández Verdejo (Trevinca Skies)		Newton ONTC
ZWO533MMpro / Clear / 50.0		0.12 ± 0.6
HAT-P-20b (LOW)
2025-03-07		Riccardo Zancan
Riccardo		Celestron C11
ASI-1600-MM / R / 60.0		-1.86 ± 1.87
HAT-P-20b (LOW)
2025-03-02		Darryl Madison
Ajijic Observatory		Celestron CPC 800 Edge HD
ZWO2400MC / Clear / 90.0		5.52 ± 1.25
HAT-P-20b (LOW)
2025-02-15		Claudio Lopresti
Claudio Lopresti		Mak-Newton
CCD Sbig ST10xme / I / 180.0		0.96 ± 1.01
HAT-P-20b (LOW)
2025-01-23		Mario Morales-Aimar
Observatorio de Sencelles MPC K14		Reflector 10"
SBIG ST7-XME / Clear / 120.0		2.36 ± 1.05
HAT-P-20b (LOW)
2025-01-20		Ramon Naves
Montcabrer		Meade LX200 12" ACF
Moravian G4-9000 / rpr / 100.0		0.68 ± 0.52
HAT-P-20b (LOW)
2025-01-18		Jean-Baptiste Marquette
MrKite47		Newton Sky-Watcher 250/1000
ZWO ASI183MM Pro / Clear / 120.0		4.34 ± 2.16
HAT-P-20b (LOW)
2025-01-15		David González Martínez
GDAO		CELESTRON C8
ASI ZWO 294 MM PRO / Clear / 120.0		4.22 ± 2.88
HAT-P-20b (LOW)
2024-12-28		Philippe Langlet
NDCruet		Célestron 8
APN CANON 1100D / Clear / 120.0		9.99 ± 2.45
HAT-P-20b (LOW)
2024-12-28		Massimiliano Mannucci
Osservatorio Astronomico Margherita Hack		Celestron C14
SBIG ST10 XME / R / 60.0		-0.38 ± 1.09
HAT-P-20b (LOW)
2024-12-28		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / R / 105.0		-0.92 ± 0.6
HAT-P-20b (LOW)
2024-12-26		Francesco Scaggiante
Gruppo Astrofili Salese "GALILEO GALILEI"		NEWTON 410/1710
Player One Astronomy Poseidon-M Pro (IMX571) / rpr / 70.0		1.36 ± 1.08
HAT-P-20b (LOW)
2024-12-03		Gustavo Muler
Obs. Nazaret J47		lx 200
ST8 XME AO8 / R / 90.0		-0.2 ± 0.45
HAT-P-20b (LOW)
2024-02-16		Yicheng Rui
Muguang Observatory		CDK14
QHY600m / Clear / 20.0		-0.28 ± 1.01
HAT-P-20b (LOW)
2024-01-18		Emanuele Pavoni
Leavitt Observatory		RC
QHY268 / R / 120.0		-2.83 ± 1.02
HAT-P-20b (LOW)
2024-01-16		Sonia J Rubie
Putlands Observatory		Meade LX200 Classic
SBIG ST8-XME / R / 240.0		2.32 ± 0.96
HAT-P-20b (LOW)
2023-12-23		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / R / 120.0		1.44 ± 0.72
HAT-P-20b (LOW)
2023-10-13		Joan Josep Isach Cogollos
Centro Astronómico Alto Turia (CAAT). MPC J57		Skywatcher
ZWO ASI 1600 MM / Lum / 120.0		-1.17 ± 1.17
HAT-P-20b (LOW)
2023-03-22		Elio Canestrelli
Terrazza-Lido		Celestron C8
Starlight SXVF-H9 / Clear / 90.0		0.45 ± 1.34
HAT-P-20b (LOW)
2023-02-27		Stéphane Montchaud
Burgundy Observatory		Celestron 8
Zwo Asi 1600 / Lum / 120.0		-0.81 ± 1.3
HAT-P-20b (LOW)
2023-02-07		Simon Dawes
William James II Observatory		Skywatcher MN190 2
ZWO ASI 1600MM-PRO USB 3.0 Mono Camera / Lum / 180.0		4.8 ± 3.02
HAT-P-20b (LOW)
2023-02-07		Lionel Rousselot
Private observatory Vierzon		Newton 250/1000
ZWO 1600 monochrome / rpr / 45.0		3.13 ± 0.73
HAT-P-20b (LOW)
2023-02-07		Francesco Scaggiante
Gruppo Astrofili Salese "GALILEO GALILEI"		NEWTON 410/1710
Custom made with KAF-1603ME CCD sensor / R / 25.0		2.44 ± 0.82
HAT-P-20b (LOW)
2023-02-07		Stephane Ferratfiat
Observatoire des Baronnies Provençales		T430
Cmos ASI 6200 ZWO / Clear / 120.0		-0.18 ± 0.5
HAT-P-20b (LOW)
2023-02-07		Claudio Lopresti
Claudio Lopresti		Mak-Newton
CCD Sbig ST10xme / I / 180.0		-0.41 ± 1.14
HAT-P-20b (LOW)
2023-02-02		Fabio Mortari
Hypatia Observatory		Ritchey Chretienne 250mm f/5.3
MORAVIAN C2-7000A / R / 200.0		-1.38 ± 1.34
HAT-P-20b (LOW)
2023-01-12		Mark Salisbury
POST		Orion Optics ODK
SBIG ST-10 XME / R / 240.0		1.17 ± 0.33
HAT-P-20b (LOW)
2022-12-18		Anaël Wünsche
Observatoire des Baronnies Provençales		CDK Planewave 2
ZWO ASI6200 / Clear / 120.0		-0.22 ± 0.59
HAT-P-20b (LOW)
2022-12-15		Adrian Jones
Private Observatory (I64)		Meade ACF 30cm
QSI 583 / R / 60.0		-0.43 ± 0.68
HAT-P-20b (LOW)
2022-11-30		Nataliia Maslennikova
Caucasus Mountain Observatory SAI MSU		RC-600 ASA
Andor iKon-L / I / 8.0		2.38 ± 0.81
HAT-P-20b (LOW)
2022-11-30		Vikrant Kumar Agnihotri
Cepheid Observatory India		GSO Ritchey–Chrétien
SX-35 TRIUS mono (KAF11002) / Lum / 120.0		0.95 ± 1.73
HAT-P-20b (LOW)
2022-10-10		Adam Popowicz
Observatory Pyskowice		RC12" GSO
ASI ZWO 1600 MM / ATIK 11000M / R / 120.0		-0.45 ± 2.88
HAT-P-20b (LOW)
2022-02-24		Adrian Jones
Private Observatory (I64)		Meade ACF 30cm
QSI 583 / R / 60.0		1.87 ± 1.01
HAT-P-20b (LOW)
2022-02-24		Paolo Arcangelo Matassa
P:M.P.H.R. Deep Sky (K81)		Ritchey Chretien 40cm-F5.3
CCD ICX453AQ / Lum / 60.0		0.57 ± 1.15
HAT-P-20b (LOW)
2022-02-24		Martin Mifsud
Manikata Observatory		Meade OTA
SBig ST10XME / Lum / 120.0		-2.31 ± 1.3
HAT-P-20b (LOW)
2022-02-04		Adrian Jones
Private Observatory (I64)		Meade ACF 30cm
QSI 583 / R / 60.0		-0.11 ± 1.87
HAT-P-20b (LOW)
2022-02-04		Martin Crow
Burnham Observatory		Celestron C9.25
SX694 mono / R / 40.0		-0.69 ± 1.3
HAT-P-20b (LOW)
2022-02-01		Alberto García Sánchez
Rio Cofio		MEADE LX200 Classic
SBIG ST8-XME / Clear / 180.0		2.65 ± 0.72
HAT-P-20b (LOW)
2022-02-01		Claudio Lopresti
Claudio Lopresti		Meade LX200 12"
CCD Sbig ST9xe / R / 90.0		1.05 ± 0.52
HAT-P-20b (LOW)
2022-01-30		Kevin Johnson
Holbrook Observatory		Meade LX10 EMC
Atik 383L+ / R / 180.0		0.09 ± 1.3
HAT-P-20b (LOW)
2022-01-12		Claudio Lopresti
Claudio Lopresti		Mak-Newton
CCD Sbig ST10xme / I / 240.0		3.26 ± 1.01
HAT-P-20b (LOW)
2022-01-12		Paolo Arcangelo Matassa
P:M.P.H.R. Deep Sky (K81)		Ritchey Chretien 40cm-F5.3
CCD ICX453AQ / Lum / 60.0		-2.64 ± 2.3
HAT-P-20b (LOW)
2021-12-17		Claudio Lopresti
Claudio Lopresti		Mak-Newton
CCD Sbig ST10xme / I / 120.0		1.91 ± 1.58
HAT-P-20b (LOW)
2021-12-17		Andras Dan
Rocca1		Celestron C8
QHY 183 M / Clear / 60.0		0.47 ± 1.15
HAT-P-20b (LOW)
2021-12-17		Paolo Arcangelo Matassa
P:M.P.H.R. Deep Sky (K81)		Ritchey Chretien 40cm-F5.3
CCD ICX453AQ / Lum / 120.0		-0.25 ± 4.32
HAT-P-20b (LOW)
2021-04-08		Anaël Wünsche
Observatoire des Baronnies Provençales		CDK Planewave 2
ZWO ASI6200 / Clear / 120.0		0.58 ± 0.58
HAT-P-20b (LOW)
2021-04-08		Dominique DANIEL
La Montjoie		Celestron CGX C8 XLT
Camera CMOS ZWO ASI294MC pro (color) / Lum / 120.0		0.44 ± 1.15
HAT-P-20b (LOW)
2021-04-08		Tõnis Eenmäe
Tartu Observatory		Planewave CDK 12.5
Apogee Alta U42 / R / 25.0		0.0 ± 1.01
HAT-P-20b (LOW)
2021-04-08		Üllar Kivila
Science Centre AHHAA		TS Optics RC 203/1624
ZWO ASI224MC / Lum / 60.0		-0.43 ± 3.17
HAT-P-20b (LOW)
2021-03-16		Jean-Bernard Pioppa
La Roque-Esclapon		KEPLER
ATIK 383 L+ / R / 120.0		-2.81 ± 1.87
HAT-P-20b (LOW)
2021-02-21		Valère Perroud
Observatoire de Duines		RC 10
Moravian G2-4000 / Lum / 90.0		-1.46 ± 1.01
HAT-P-20b (LOW)
2020-12-09		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / R / 120.0		-2.23 ± 0.72
HAT-P-20b (LOW)
2020-11-19		Jacques Michelet
Claix		Celestron C11 Edge HD
QSI-632 WSG / AstrodonExoPlanet-BB / 30.0		-1.61 ± 0.86
HAT-P-20b (LOW)
2020-11-19		David Wright
Yorick (private observatory)		10" Ritchey-Chretien
QSI 683WSG-8 / R / 250.0		-2.48 ± 1.44
HAT-P-20b (LOW)
2020-03-28		Martin Fowler
MicroObservatory Cecilia		MicroObservatory robotic telescope
KAF 1402ME / Clear / 60.0		0.64 ± 2.02
HAT-P-20b (LOW)
2020-03-13		Francois Hurter
Albireo Observatory		RC GSO Serrurier Kepler f/8
Atik 383L+ / V / 35.0		-0.81 ± 0.58
HAT-P-20b (LOW)
2020-02-19		Mario Morales-Aimar
Observatorio de Sencelles MPC K14		Reflector 10"
SBIG ST7-XME / V / 90.0		0.26 ± 0.86
HAT-P-20b (LOW)
2020-01-24		Pavel Pintr
Horni Halze		Celestron C9.25 with Hyperstar f2.2
ASI ZWO 1600 MONO / R / 70.0		1.64 ± 1.73
HAT-P-20b (LOW)
2020-01-01		Pavel Pintr
Horni Halze		Celestron C9.25 with Hyperstar f2.2
ASI ZWO 1600 MONO / R / 90.0		-1.03 ± 0.86
HAT-P-20b (LOW)
2019-12-01		Martin Fowler
MicroObservatory Cecilia		MicroObservatory robotic telescope
KAF 1402ME / Clear / 60.0		2.56 ± 2.02
HAT-P-20b (LOW)
2019-03-08		Anaël Wünsche
Observatoire des Baronnies Provençales		CDK Planewave
SBIG STL11K / V / 120.0		1.65 ± 1.01
HAT-P-20b (LOW)
2018-02-10		Claudio Lopresti
Claudio Lopresti		Mak-Newton
CCD Sbig ST10xme / Clear / 240.0		0.55 ± 0.43
HAT-P-20b (LOW)
2018-01-13		Martin Fowler
MicroObservatory Cecilia		MicroObservatory robotic telescope
KAF 1402ME / Clear / 60.0		-3.08 ± 1.73
HAT-P-20b (LOW)
2015-02-22		Anaël Wünsche
Observatoire des Baronnies Provençales		CDK Planewave
SBIG STL11K / Clear / 30.0		0.9 ± 0.72
HAT-P-20b (LOW)
2012-12-27		Ramon Naves
Montcabrer		Meade LX200 12" ACF
Sbig ST8xme / R / 120.0		2.52 ± 0.52
HAT-P-20b (LOW)
2011-01-16		Filip Walter
Stefanik Observatory		Meade SCT
SBIG ST-10XME / R / 90.0		0.21 ± 0.72

Space Observations
Planet
Observation Date		 Mission O-C
minutes
HAT-P-20b (LOW)
2023-12-06		TESS-0.2 ± 0.39
HAT-P-20b (LOW)
2023-12-03		TESS0.32 ± 0.35
HAT-P-20b (LOW)
2023-11-28		TESS0.6 ± 0.39
HAT-P-20b (LOW)
2023-11-22		TESS0.19 ± 0.32
HAT-P-20b (LOW)
2023-11-19		TESS0.03 ± 0.29
HAT-P-20b (LOW)
2023-11-16		TESS0.29 ± 0.36
HAT-P-20b (LOW)
2023-11-07		TESS-0.18 ± 0.36
HAT-P-20b (LOW)
2023-11-02		TESS-0.33 ± 0.35
HAT-P-20b (LOW)
2023-10-27		TESS0.15 ± 0.37
HAT-P-20b (LOW)
2023-10-24		TESS0.28 ± 0.35
HAT-P-20b (LOW)
2023-10-21		TESS-0.7 ± 0.29
HAT-P-20b (LOW)
2023-10-18		TESS-0.1 ± 0.37
HAT-P-20b (LOW)
2021-12-29		TESS0.15 ± 0.36
HAT-P-20b (LOW)
2021-12-26		TESS0.65 ± 0.32
HAT-P-20b (LOW)
2021-12-23		TESS-0.04 ± 0.32
HAT-P-20b (LOW)
2021-12-20		TESS-0.72 ± 0.35
HAT-P-20b (LOW)
2021-12-15		TESS-0.19 ± 0.35
HAT-P-20b (LOW)
2021-12-12		TESS0.42 ± 0.3
HAT-P-20b (LOW)
2021-12-09		TESS-0.21 ± 0.39
HAT-P-20b (LOW)
2021-12-06		TESS0.47 ± 0.37
HAT-P-20b (LOW)
2021-11-30		TESS0.07 ± 0.35
HAT-P-20b (LOW)
2021-11-27		TESS-0.07 ± 0.33
HAT-P-20b (LOW)
2021-11-24		TESS0.02 ± 0.33
HAT-P-20b (LOW)
2021-11-19		TESS-0.95 ± 0.36
HAT-P-20b (LOW)
2021-11-16		TESS0.45 ± 0.32
HAT-P-20b (LOW)
2021-11-13		TESS0.08 ± 0.27
HAT-P-20b (LOW)
2021-11-10		TESS-0.39 ± 0.3
HAT-P-20b (LOW)
2021-11-04		TESS-0.29 ± 0.35
HAT-P-20b (LOW)
2021-11-01		TESS0.22 ± 0.33
HAT-P-20b (LOW)
2021-10-30		TESS-0.26 ± 0.32
HAT-P-20b (LOW)
2021-10-27		TESS-0.53 ± 0.33
HAT-P-20b (LOW)
2021-10-21		TESS-0.51 ± 0.33
HAT-P-20b (LOW)
2021-10-18		TESS0.08 ± 0.36
HAT-P-20b (LOW)
2021-10-15		TESS-0.56 ± 0.32

Literature Mid-times
Planet
Observation Date		 Reference O-C
minutes
2017-11-13 Wang et al. 2021 -0.38 ± 1.87
2017-01-21 Wang et al. 2021 2.11 ± 1.09
2016-11-30 Wang et al. 2021 0.4 ± 1.17
2016-11-07 Wang et al. 2021 -0.11 ± 0.53
2016-03-05 Wang et al. 2021 1.9 ± 0.76
2016-03-02 Wang et al. 2021 0.86 ± 2.74
2015-04-09 Sun et al. 2017 -0.04 ± 0.94
2015-01-28 Sun et al. 2017 -0.06 ± 0.94
2014-10-25 Esposito et al. 2017 -0.36 ± 0.08
2014-10-25 Sun et al. 2017 -0.75 ± 0.58
2014-02-19 Baştürk et al. 2015 -0.22 ± 0.13
2013-12-07 Sun et al. 2017 1.89 ± 0.49
2013-11-14 Sun et al. 2017 -0.27 ± 1.09
2012-03-11 Sun et al. 2017 0.34 ± 0.55
2012-01-17 Esposito et al. 2017 1.53 ± 0.36
2011-12-22 Granata et al. 2014 -0.45 ± 0.4
2011-11-29 Granata et al. 2014 2.46 ± 0.62
2011-02-05 Granata et al. 2014 1.07 ± 0.23
2010-12-27 Sun et al. 2017 1.61 ± 0.36
2010-12-27 Sun et al. 2017 -1.5 ± 0.5
2010-12-24 Sun et al. 2017 1.07 ± 1.85
2010-12-01 Sun et al. 2017 -1.3 ± 0.6
2009-09-06 Bakos et al. 2011 0.18 ± 0.3
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