exoclock

GJ436b (LOW)

Discovered by: Butler et al. 2004

The Star
Simbad
GAIA
2MASS		 Ross 905
DR2 4017860992519744384
J11421096+2642251
RA 11:42:11.0933 DEC +26:42:23.658
Parallax
102.501 mas		 P.M. RA
895.047 mas/y		 P.M. DEC
-814.03 mas/y
MagV
10.613		 MagR
10.272		 MagI
8.24		 MagJ
6.9		 MagH
6.319		 MagK
6.073
MagG
9.571		 MagGBP
10.917		 MagGRP
8.46
*Calculated from GAIA magnitudes.

Ephemeris - Verified True
Kokori et al. 2025
Mid-time
2455695.26802 ± 4.5e-05 BJDTDB
Period
2.643897626 ± 6.4e-08 days
Transit Parameters
Knutson et al. 2011
Rp/Rs
0.0831 ± 0.0003		 a/Rs**
14.367 +0.021 -0.021
 i
86.7 +0.03 -0.03 deg
e
-		 ω
- deg
DepthR*
7.0 mmag		 Duration*
0.99 hours
*Calculated from the other parameters, using PyLightcurve.
**Adjusted based on the space observations.

Limb Darkening Parameters
Torres et al. 2008
Teff
3350.0 +300.0 -300.0 K
 Log(g)
4.84 +0.02 -0.01 cm/s2
 Fe/H
-0.03 +0.2 -0.2 dex
ExoClock Status
Observing Priority LOW
Minimum aperture 9.01"
Total Observations (Recent) 106 (10)
O-C -1.2 ± 0.34 minutes
ExoClock Observations (Recent) 69 (10)
Space Observations (Recent) 14 (0)
ETD Observations (Recent) 0 (0)
Literature Mid-times (Recent) 23 (0)
Kepler Rp/Rs -
TESS Rp/Rs 0.08151 ± 0.00032

GJ436b


ExoClock Observations
Planet
Observation Date		 Observer
Observatory		 Telescope
Camera / Filter / Exp [s]		 O-C
minutes
GJ436b (LOW)
2026-03-07		Ana Atanasova
ANI		skywathcher
zwo asi 585 mm pro / R / 60.0		-2.54 ± 2.16
GJ436b (LOW)
2026-02-27		Nikola Antonov
Meshtitsa		Sky-Watcher Explorer PDS
ASI 533MM Pro Mono CMOS / R / 60.0		-0.76 ± 1.41
GJ436b (LOW)
2026-02-27		Ana Atanasova
ANI		skywathcher
zwo asi 585 mm pro / R / 60.0		-7.48 ± 0.99
GJ436b (LOW)
2026-01-06		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / R / 120.0		-1.61 ± 1.44
GJ436b (LOW)
2025-12-29		Tommaso Dittadi
TD-TRO		Ritchey-Chretien
Moravian G2-1600 / R / 90.0		-4.06 ± 2.16
GJ436b (LOW)
2025-05-28		Mario Morales-Aimar
Observatorio de Sencelles MPC K14		Reflector 10"
SBIG ST7-XME / V / 90.0		-0.16 ± 1.58
GJ436b (LOW)
2025-05-28		Jordi González-Edo
Landete-Kea		C11
ASI 2600MM pro / Lum / 90.0		-6.07 ± 2.02
GJ436b (LOW)
2025-04-21		Adrian Jones
Private Observatory (I64)		Meade ACF 30cm
QSI 583 / R / 30.0		1.08 ± 1.73
GJ436b (LOW)
2025-04-13		John Collins
JC_Wrexham		Meade LX200GPS
ASI-290m / rpr / 60.0		2.23 ± 1.87
GJ436b (LOW)
2025-03-29		David Bennett
Rickford Observatory		GSO RC
ZWO ASI2600MM Pro / R / 60.0		1.34 ± 2.02
GJ436b (LOW)
2025-03-07		Francesco Scaggiante
Gruppo Astrofili Salese "GALILEO GALILEI"		NEWTON 410/1710
Player One Astronomy Poseidon-M Pro (IMX571) / rpr / 50.0		2.22 ± 1.25
GJ436b (LOW)
2025-03-07		Stéphane Montchaud
Burgundy Observatory		Celestron 8
Zwo Asi 1600 / Lum / 60.0		-4.55 ± 1.28
GJ436b (LOW)
2025-02-25		Charles Miller
Miller Observatory		Meade 12" LX850
QHY268M / R / 30.0		-5.32 ± 1.87
GJ436b (LOW)
2025-02-20		Michael Nezel
Celle Observatory		CDK 14
QHY 268M / I / 30.0		0.57 ± 1.17
GJ436b (LOW)
2024-05-07		Javier Flores Martín
Calar Alto Hispano en Andalucia		Multi Array of Combinate Telescope (MARCOT)
ZWO1600MM / R / 30.0		0.73 ± 0.71
GJ436b (LOW)
2024-04-29		Alberto Tomatis
Alto-Observatory		RC
QHY 268M / Lum / 40.0		1.34 ± 2.02
GJ436b (LOW)
2024-04-29		Mauro Caló
Cavallino		RC
SBIG ST10 / Lum / 60.0		1.34 ± 1.58
GJ436b (LOW)
2024-02-15		Bruno Monteleone
Osservatorio Astronomico La Macchina del Tempo		GSO RC
ASI1600MM / Clear / 45.0		-0.63 ± 1.87
GJ436b (LOW)
2024-02-15		Nikola Antonov
Meshtitsa		Sky-Watcher Explorer PDS
ASI 533MM Pro Mono CMOS / V / 60.0		-1.04 ± 1.17
GJ436b (LOW)
2023-12-17		Miguel Ángel Álava Amat
Sarriguren		Meade SC 8"
Asi 1600 MM / rpr / 180.0		0.3 ± 1.87
GJ436b (LOW)
2023-05-24		David Arnot
OSO PIRATE		PlaneWave Instruments CDK24 24 inch (610 mm) f/6.5 Corrected Dall-Kirkham Astrograph
FLI ProLine KAF-16803 / R / 30.0		4.13 ± 1.15
GJ436b (LOW)
2023-05-24		Andre Kovacs
Moletai Astronomical Observatory (MAO)		35/51 cm Maksutov f/3.5
Apogee Alta U47 / R / 20.0		-1.78 ± 1.38
GJ436b (LOW)
2023-05-16		David Arnot
OSO PIRATE		PlaneWave Instruments CDK24 24 inch (610 mm) f/6.5 Corrected Dall-Kirkham Astrograph
FLI ProLine KAF-16803 / R / 30.0		1.37 ± 0.73
GJ436b (LOW)
2023-04-25		Stefano Lora
MarSEC		Ritchey Chrétien
Moravian G2 Mark II / R / 90.0		3.89 ± 3.02
GJ436b (LOW)
2023-04-25		Paolo Arcangelo Matassa
P:M.P.H.R. Deep Sky (K81)		Ritchey Chretien 40cm-F5.3
CCD ICX453AQ / Lum / 30.0		-1.02 ± 1.35
GJ436b (LOW)
2023-04-17		Esteban García N.
Obs. Astronómico Vega del Codorno, MPC code Y96		RC14 CFF
ZWO ASI6200MM Pro / Lum / 30.0		2.97 ± 0.98
GJ436b (LOW)
2023-04-17		Miguel Ángel Álava Amat
Sarriguren		Meade SC 8"
Asi 1600 MM / rpr / 180.0		-2.63 ± 1.43
GJ436b (LOW)
2023-04-09		David Arnot
OSO COAST		PlaneWave Instruments CDK17 17 inch (432 mm) f/6.8 Corrected Dall-Kirkham Astrograph
FLI ProLine KAF-09000 / R / 30.0		-0.31 ± 0.88
GJ436b (LOW)
2023-04-09		Jean-Claude MARIO
Stelle di Corsica		Astrosib RC 360
MORAVIAN G4 16000 capteur 16803 / Lum / 120.0		-0.87 ± 0.84
GJ436b (LOW)
2023-03-25		Pierre Gamache
Observatoire de la Licorne		RC
ASI6200MM / R / 120.0		-0.76 ± 1.73
GJ436b (LOW)
2023-03-19		Ioannis Gkolias
Noesis Astronomical Station		RASA 8''
QHY268M / Lum / 12.0		-0.48 ± 1.58
GJ436b (LOW)
2023-03-03		Dominique DANIEL
La Montjoie		T250 Skyvision
Camera CMOS ZWO ASI2600MC pro (color) / Clear / 59.0		1.95 ± 1.87
GJ436b (LOW)
2023-02-24		Simon Dawes
William James II Observatory		Skywatcher MN190 2
ZWO ASI 1600MM-PRO USB 3.0 Mono Camera / R / 300.0		4.67 ± 3.46
GJ436b (LOW)
2022-06-09		David Arnot
OSO COAST		PlaneWave Instruments CDK17 17 inch (432 mm) f/6.8 Corrected Dall-Kirkham Astrograph
FLI ProLine KAF-09000 / R / 25.0		0.0 ± 0.96
GJ436b (LOW)
2022-04-25		Mercedes Correa
Sirius B		Meade
Moravian G2 1600 / R / 60.0		0.54 ± 1.3
GJ436b (LOW)
2022-04-10		David Arnot
OSO PIRATE		PlaneWave Instruments CDK24 24 inch (610 mm) f/6.5 Corrected Dall-Kirkham Astrograph
FLI ProLine KAF-16803 / R / 30.0		1.88 ± 0.59
GJ436b (LOW)
2022-04-04		Francesco Scaggiante
Gruppo Astrofili Salese "GALILEO GALILEI"		NEWTON 410/1710
Custom made with KAF-1603ME CCD sensor / R / 15.0		-1.46 ± 1.14
GJ436b (LOW)
2022-04-02		Bryan Martin
Tiger Butte Obseratory		AG Opitcal
ZWO ASI 294 / AstrodonExoPlanet-BB / 45.0		-1.31 ± 1.34
GJ436b (LOW)
2022-03-19		Adrian Jones
Private Observatory (I64)		Meade ACF 30cm
QSI 583 / R / 60.0		2.65 ± 2.02
GJ436b (LOW)
2022-03-19		Martin Crow
Burnham Observatory		Celestron C9.25
SX694 mono / R / 20.0		-3.54 ± 4.75
GJ436b (LOW)
2022-02-10		Adrian Jones
Private Observatory (I64)		Meade ACF 30cm
QSI 583 / R / 60.0		-0.86 ± 2.59
GJ436b (LOW)
2021-04-12		John Savage
Z42 Rushay Farm Observatory		Celestron 14Edge FR
ZWO ASI6200MM / R / 30.0		0.46 ± 0.73
GJ436b (LOW)
2021-04-12		Ferran Grau Horta
Ca L'Ou		Meade ACF 16''
FLI Proline PL1001 / B / 100.0		0.05 ± 1.58
GJ436b (LOW)
2021-03-06		Francesco Scaggiante
Gruppo Astrofili Salese "GALILEO GALILEI"		NEWTON 410/1710
Custom made with KAF-1603ME CCD sensor / R / 20.0		3.45 ± 2.88
GJ436b (LOW)
2021-03-06		Lionel Rousselot
Private observatory Vierzon		Newton 250/1200
ZWO 1600 monochrome / Clear / 120.0		2.16 ± 1.58
GJ436b (LOW)
2021-03-06		John Savage
Z42 Rushay Farm Observatory		Celestron 14Edge FR
ZWO ASI6200MM / Clear / 30.0		1.42 ± 1.34
GJ436b (LOW)
2021-03-06		Manfred Raetz
privat observatory Herges-Hallenberg		SCT 280 /1790 (Celestron C11 with reducer)
Moravian Instruments G2-1600 / R / 120.0		1.28 ± 0.89
GJ436b (LOW)
2021-03-06		Massimiliano Mannucci
Osservatorio Astronomico Margherita Hack		Celestron C14
SBIG ST10 XME / Clear / 8.0		-0.15 ± 2.16
GJ436b (LOW)
2021-03-04		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / R / 120.0		2.01 ± 1.04
GJ436b (LOW)
2021-02-26		John Savage
Z42 Rushay Farm Observatory		Celestron 14Edge FR
ZWO ASI6200MM / rpr / 30.0		2.95 ± 1.32
GJ436b (LOW)
2020-03-22		Manfred Raetz
privat observatory Herges-Hallenberg		SCT 280 /1790 (Celestron C11 with reducer)
Moravian Instruments G2-1600 / R / 60.0		3.1 ± 1.41
GJ436b (LOW)
2020-03-14		Anaël Wünsche
Observatoire des Baronnies Provençales		CDK Planewave
SBIG STL11K / Clear / 120.0		0.67 ± 0.84
GJ436b (LOW)
2020-02-14		Anaël Wünsche
Observatoire des Baronnies Provençales		CDK Planewave
SBIG STL11K / Clear / 120.0		-1.38 ± 1.05
GJ436b (LOW)
2020-02-06		Alberto Tomatis
Alto-Observatory		RC
STL 6303 / R / 60.0		1.51 ± 1.58
GJ436b (LOW)
2020-02-06		Anaël Wünsche
Observatoire des Baronnies Provençales		Astelco
FLIPL230 / Clear / 60.0		-0.7 ± 0.84
GJ436b (LOW)
2020-01-30		Anaël Wünsche
Observatoire des Baronnies Provençales		CDK Planewave
SBIG STL11K / Clear / 120.0		4.26 ± 1.09
GJ436b (LOW)
2019-05-15		Anaël Wünsche
Observatoire des Baronnies Provençales		CDK Planewave
SBIG STL11K / V / 60.0		2.31 ± 1.58
GJ436b (LOW)
2019-04-08		Anaël Wünsche
Observatoire des Baronnies Provençales		CDK Planewave
SBIG STL11K / V / 120.0		-0.26 ± 1.18
GJ436b (LOW)
2018-02-09		Lorenzo Betti
Osservatorio Polifunzionale del Chianti		RC-80cm
Moravian G2 - KAF1603ME / AstrodonExoPlanet-BB / 20.0		6.18 ± 3.02
GJ436b (LOW)
2017-04-11		Anaël Wünsche
Observatoire des Baronnies Provençales		CDK Planewave
SBIG STL11K / Clear / 60.0		5.34 ± 1.27
GJ436b (LOW)
2012-03-12		Alessandro Marchini
Astronomical Observatory University of Siena		Mak-Cas 0.3m f/5.6
Sbig STL-6303 / R / 60.0		2.67 ± 1.73
GJ436b (LOW)
2012-03-04		Filip Walter
Stefanik Observatory		Meade SCT
SBIG ST-10XME / R / 135.0		0.22 ± 1.04
GJ436b (LOW)
2011-12-27		Ramon Naves
Montcabrer		Meade LX200 12" ACF
Sbig ST8xme / R / 120.0		-0.96 ± 0.95
GJ436b (LOW)
2011-02-04		Alessandro Marchini
Astronomical Observatory University of Siena		Mak-Cas 0.3m f/5.6
Sbig STL-6303 / Clear / 60.0		3.59 ± 3.02
GJ436b (LOW)
2009-01-30		Alessandro Marchini
Astronomical Observatory University of Siena		Mak-Cas 0.3m f/5.6
Sbig STL-6303 / R / 150.0		0.25 ± 1.32
GJ436b (LOW)
2008-04-23		Ramon Naves
Montcabrer		Meade LX200 12" ACF
Sbig ST8xme / R / 120.0		1.41 ± 0.68
GJ436b (LOW)
2008-02-16		Filip Walter
Stefanik Observatory		Meade SCT
SBIG ST-10XME / R / 30.0		1.47 ± 1.44
GJ436b (LOW)
2008-02-16		Alessandro Marchini
Astronomical Observatory University of Siena		Mak-Cas 0.3m f/5.6
Sbig STL-6303 / R / 120.0		1.47 ± 3.02
GJ436b (LOW)
2008-02-09		Alessandro Marchini
Astronomical Observatory University of Siena		Mak-Cas 0.3m f/5.6
Sbig STL-6303 / R / 60.0		-2.0 ± 2.74

Space Observations
Planet
Observation Date		 Mission O-C
minutes
GJ436b (LOW)
2022-03-25		TESS-0.3 ± 0.33
GJ436b (LOW)
2022-03-22		TESS-0.29 ± 0.3
GJ436b (LOW)
2022-03-19		TESS0.27 ± 0.33
GJ436b (LOW)
2022-03-09		TESS0.19 ± 0.32
GJ436b (LOW)
2022-03-06		TESS-0.45 ± 0.3
GJ436b (LOW)
2022-03-04		TESS0.27 ± 0.33
GJ436b (LOW)
2020-03-17		TESS0.81 ± 0.35
GJ436b (LOW)
2020-03-14		TESS-0.16 ± 0.3
GJ436b (LOW)
2020-03-12		TESS0.17 ± 0.33
GJ436b (LOW)
2020-03-09		TESS0.15 ± 0.37
GJ436b (LOW)
2020-03-01		TESS-0.31 ± 0.35
GJ436b (LOW)
2020-02-28		TESS-0.05 ± 0.36
GJ436b (LOW)
2020-02-25		TESS-0.5 ± 0.35
GJ436b (LOW)
2020-02-22		TESS-0.37 ± 0.37

Literature Mid-times
Planet
Observation Date		 Reference O-C
minutes
2016-03-08 Wang et al. 2021 -3.8 ± 1.73
2013-01-02 Knutson et al. 2014 -0.12 ± 0.1
2012-12-10 Knutson et al. 2014 -0.15 ± 0.14
2012-11-29 Knutson et al. 2014 -0.02 ± 0.14
2012-10-26 Knutson et al. 2014 -0.19 ± 0.16
2009-01-28 Beaulieu et al. 2011 -0.95 ± 0.12
2008-03-09 Alonso et al. 2008 -0.52 ± 0.22
2008-02-09 Ribas et al. 2008 0.74 ± 0.72
2008-01-02 Bean et al. 2008 0.56 ± 1.35
2007-12-28 Bean et al. 2008 -1.42 ± 1.28
2007-12-12 Bean et al. 2008 0.09 ± 1.15
2007-12-10 Bean et al. 2008 0.31 ± 1.34
2007-12-04 Bean et al. 2008 0.33 ± 0.98
2007-06-29 Gillon et al. 2007 -0.32 ± 0.22
2007-05-31 Shporer et al. 2009 0.55 ± 0.43
2007-05-25 Shporer et al. 2009 -2.33 ± 0.58
2007-05-23 Shporer et al. 2009 -1.36 ± 0.37
2007-05-17 Turner et al. 2016 0.41 ± 0.06
2007-05-17 Cáceres et al. 2009 -1.06 ± 0.66
2007-05-15 Shporer et al. 2009 -0.48 ± 0.14
2007-05-04 Shporer et al. 2009 0.37 ± 0.43
2007-05-04 Shporer et al. 2009 -0.3 ± 0.55
2007-05-02 Gillon et al. 2007 -0.06 ± 1.44
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