exoclock

HAT-P-18b (LOW - SPOTS)

Discovered by: Hartman et al. 2011

The Star
Simbad
GAIA
2MASS		 HAT-P-18
DR2 1334573817793362560
J17052315+3300450
RA 17:05:23.1475 DEC +33:00:44.939
Parallax
6.167 mas		 P.M. RA
-14.073 mas/y		 P.M. DEC
-36.689 mas/y
MagV
12.759		 MagR
12.61		 MagI*
11.659		 MagJ
10.822		 MagH
10.34		 MagK
10.234
MagG
12.368		 MagGBP
12.939		 MagGRP
11.681
*Calculated from GAIA magnitudes.

Ephemeris - Verified True
Kokori et al. 2025
Mid-time
2457435.98945 ± 0.0001 BJDTDB
Period
5.50802907 ± 6.3e-07 days
Transit Parameters
Kirk et al. 2017
Rp/Rs
0.1356 ± 0.0028		 a/Rs
16.39 +0.24 -0.24
 i
88.53 +0.16 -0.16 deg
e
-		 ω
- deg
DepthR*
24.28 mmag		 Duration*
2.71 hours
*Calculated from the other parameters, using PyLightcurve.
**Adjusted based on the space observations.

Limb Darkening Parameters
Hartman et al. 2011
Teff
4803.0 +80.0 -80.0 K
 Log(g)
4.57 +0.04 -0.04 cm/s2
 Fe/H
0.1 +0.08 -0.08 dex
ExoClock Status
Observing Priority LOW - SPOTS
Minimum aperture 6.93"
Total Observations (Recent) 66 (16)
O-C 0.29 ± 0.17 minutes
ExoClock Observations (Recent) 49 (16)
Space Observations (Recent) 7 (0)
ETD Observations (Recent) 0 (0)
Literature Mid-times (Recent) 10 (0)
Kepler Rp/Rs -
TESS Rp/Rs 0.13595 ± 0.00074

HAT-P-18b


ExoClock Observations
Planet
Observation Date		 Observer
Observatory		 Telescope
Camera / Filter / Exp [s]		 O-C
minutes
HAT-P-18b (LOW - SPOTS)
2025-08-02		Ivo Silvestri
Trevinca Skies		Skywatcher Newton 250pds
ASI2600MM Duo / Lum / 60.0		0.03 ± 1.18
HAT-P-18b (LOW - SPOTS)
2025-07-10		Thomas SALOMON
Observatoire de l'ombrée		Ritchey Chretien 14" F/8
QHY600 / R / 49.0		0.16 ± 1.31
HAT-P-18b (LOW - SPOTS)
2025-07-10		philippe buysschaert
Obervatoire des Baronnies Provencales		Celestrob C8
zwo 1600 mmpro / R / 100.0		-2.54 ± 2.16
HAT-P-18b (LOW - SPOTS)
2025-06-29		Manfred Raetz
privat observatory Herges-Hallenberg		SCT 280/1850 (C11 with Starizona reducer)
Moravian Instruments G2-1600 / AstrodonExoPlanet-BB / 120.0		0.39 ± 0.46
HAT-P-18b (LOW - SPOTS)
2025-06-29		Matthieu Bachschmidt
Gonachon		Celestron C11
SBIG ST8XME / AstrodonExoPlanet-BB / 120.0		0.13 ± 0.55
HAT-P-18b (LOW - SPOTS)
2025-06-29		Simon Dawes
William James II		Celestron Edge11 HD
Risingcam Monochrome SONY imx571 / Lum / 300.0		-1.01 ± 1.58
HAT-P-18b (LOW - SPOTS)
2025-06-29		Dim Stouraitis
Galilaios		SCT
SXVF-H9 Starlight-Xpress / I / 120.0		-1.44 ± 2.3
HAT-P-18b (LOW - SPOTS)
2025-06-18		Patrick Farizy
Patrick Farizy		Celestron C8
Touptek 585 C / Clear / 90.0		2.1 ± 2.02
HAT-P-18b (LOW - SPOTS)
2025-06-18		Manfred Raetz
privat observatory Herges-Hallenberg		SCT 280/1850 (C11 with Starizona reducer)
Moravian Instruments G2-1600 / AstrodonExoPlanet-BB / 120.0		1.26 ± 0.49
HAT-P-18b (LOW - SPOTS)
2025-06-18		Francesco Scaggiante
Gruppo Astrofili Salese "GALILEO GALILEI"		NEWTON 410/1710
Player One Astronomy Poseidon-M Pro (IMX571) / rpr / 100.0		0.8 ± 2.02
HAT-P-18b (LOW - SPOTS)
2025-06-18		Paolo Arcangelo Matassa
P:M.P.H.R. Deep Sky (K81)		Ritchey Chretien 40cm-F5.3
CCD ICX453AQ / Lum / 90.0		0.22 ± 1.73
HAT-P-18b (LOW - SPOTS)
2025-06-07		Alessandro Marchini
Astronomical Observatory University of Siena		Mak-Cas 0.3m f/5.6
Sbig STL-6303 / I / 180.0		1.37 ± 1.22
HAT-P-18b (LOW - SPOTS)
2025-05-27		Mario Morales-Aimar
Observatorio de Sencelles MPC K14		Reflector 10"
SBIG ST7-XME / Clear / 100.0		0.33 ± 1.3
HAT-P-18b (LOW - SPOTS)
2025-05-16		Tommaso Dittadi
TD-TRO		Ritchey-Chretien
Moravian G2-1600 / R / 90.0		-1.25 ± 2.45
HAT-P-18b (LOW - SPOTS)
2025-05-11		Bryan Martin
Tiger Butte Observatory Remote		AG Optical IDK
ZWO ASI 294 / Lum / 180.0		4.41 ± 1.73
HAT-P-18b (LOW - SPOTS)
2025-04-08		Charles Miller
Miller Observatory		Meade 12" LX850
QHY268M / R / 60.0		-1.81 ± 1.22
HAT-P-18b (LOW - SPOTS)
2024-07-28		Michael Irzyk
Melun		C14
H694 / Clear / 90.0		2.03 ± 0.86
HAT-P-18b (LOW - SPOTS)
2024-07-28		Michael Nezel
Celle Observatory		CDK 14
QHY 268M / R / 120.0		0.78 ± 0.82
HAT-P-18b (LOW - SPOTS)
2024-07-28		Ian Sharp
Ham Observatory		Celestron C9.25 Edge HD
Starlight Xpress Trius Pro SX694 / R / 90.0		0.36 ± 1.14
HAT-P-18b (LOW - SPOTS)
2024-07-28		Anaël Wünsche
Observatoire des Baronnies Provençales		CDK Planewave 2
ZWO ASI6200 / R / 120.0		-0.13 ± 0.89
HAT-P-18b (LOW - SPOTS)
2024-07-28		Stéphane Montchaud
Burgundy Observatory		Celestron 8
Zwo Asi 1600 / Lum / 120.0		-1.34 ± 2.3
HAT-P-18b (LOW - SPOTS)
2024-07-28		Adrian Jones
Private Observatory (I64)		Meade ACF 30cm
QSI 583 / R / 150.0		-1.42 ± 1.44
HAT-P-18b (LOW - SPOTS)
2024-07-28		Mercedes Correa
Sirius B		Meade
Moravian G2 1600 / R / 120.0		-2.53 ± 1.38
HAT-P-18b (LOW - SPOTS)
2024-07-28		Marc Serrau
A77 - Dauban		Meade SC 12"
QHY260MM / rpr / 300.0		-3.93 ± 1.24
HAT-P-18b (LOW - SPOTS)
2024-07-17		Manfred Raetz
privat observatory Herges-Hallenberg		SCT 280/1850 (C11 with Starizona reducer)
Moravian Instruments G2-1600 / AstrodonExoPlanet-BB / 120.0		0.96 ± 0.56
HAT-P-18b (LOW - SPOTS)
2024-07-17		Michael Nezel
Celle Observatory		CDK 14
QHY 268M / R / 60.0		-0.32 ± 1.12
HAT-P-18b (LOW - SPOTS)
2024-07-17		Ian Sharp
PixelSkies		Celestron C11 Edge HD
Starlight Xpress Trius Pro SX694 / R / 120.0		-1.97 ± 2.16
HAT-P-18b (LOW - SPOTS)
2024-07-17		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / Lum / 180.0		-4.34 ± 1.43
HAT-P-18b (LOW - SPOTS)
2024-07-06		Deborah Smith
El Olivar, Gergal, Spain		William Optics GT81
ASI2600MM / R / 180.0		1.28 ± 3.17
HAT-P-18b (LOW - SPOTS)
2024-07-06		Dim Stouraitis
Galilaios		SCT
SXVF-H9 Starlight-Xpress / R / 100.0		0.85 ± 3.31
HAT-P-18b (LOW - SPOTS)
2024-07-06		Michael Nezel
Celle Observatory		CDK 14
QHY 268M / R / 60.0		0.53 ± 0.94
HAT-P-18b (LOW - SPOTS)
2024-06-25		Manfred Raetz
privat observatory Herges-Hallenberg		SCT 280/1850 (C11 with Starizona reducer)
Moravian Instruments G2-1600 / AstrodonExoPlanet-BB / 120.0		1.15 ± 0.69
HAT-P-18b (LOW - SPOTS)
2024-06-03		Livia Moretti
Leavitt Observatory		Ritchey-Chrétien 10'' f/8
QHY268 / R / 180.0		-0.06 ± 2.45
HAT-P-18b (LOW - SPOTS)
2024-06-03		Paolo Arcangelo Matassa
P:M.P.H.R. Deep Sky (K81)		Ritchey Chretien 40cm-F5.3
CCD ICX453AQ / Lum / 60.0		-4.95 ± 1.87
HAT-P-18b (LOW - SPOTS)
2023-08-05		Anaël Wünsche
Observatoire des Baronnies Provençales		CDK Planewave 2
ZWO ASI6200 / Clear / 120.0		0.85 ± 0.76
HAT-P-18b (LOW - SPOTS)
2023-05-26		Bryan Martin
Tiger Butte Observatory Remote		AG Optical IDK
ZWO ASI 294 / Lum / 180.0		1.5 ± 1.58
HAT-P-18b (LOW - SPOTS)
2023-04-23		Darryl Madison
Ajijic Observatory		Celestron CPC 800 Edge HD
ZWO2400MC / Clear / 180.0		2.61 ± 2.16
HAT-P-18b (LOW - SPOTS)
2023-02-16		Miguel Ángel Álava Amat
Sarriguren		Meade SC 8"
Asi 1600 MM / Lum / 240.0		-4.12 ± 1.15
HAT-P-18b (LOW - SPOTS)
2022-08-01		Anaël Wünsche
Observatoire des Baronnies Provençales		CDK Planewave 2
ZWO ASI6200 / Clear / 120.0		-2.58 ± 0.86
HAT-P-18b (LOW - SPOTS)
2022-07-21		Dim Stouraitis
Galilaios		SCT
SXVF-H9 Starlight-Xpress / R / 60.0		1.82 ± 1.73
HAT-P-18b (LOW - SPOTS)
2022-07-10		Martin Mifsud
Manikata Observatory		Meade OTA
SBig ST10XME / Lum / 120.0		-1.4 ± 3.6
HAT-P-18b (LOW - SPOTS)
2021-08-19		Tõnis Eenmäe
Tartu Observatory		Planewave CDK 12.5
Apogee Alta U42 / R / 90.0		-0.23 ± 1.44
HAT-P-18b (LOW - SPOTS)
2021-07-28		Nello Ruocco
Osservatorio Astronomico Nastro Verde di Sorrento MPC code C82		SC Meade LX200 GPS on equatorial fork
Sbig ST10XME / Clear / 200.0		0.08 ± 1.01
HAT-P-18b (LOW - SPOTS)
2021-05-18		Billy Edwards
McDonald Observatory		LCO Meade
SBIG STX6303 / rpr / 90.288		-0.67 ± 1.44
HAT-P-18b (LOW - SPOTS)
2019-02-23		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / Clear / 120.0		-0.81 ± 1.87
HAT-P-18b (LOW - SPOTS)
2015-05-07		Marc Deldem
Les Barres Observatory		Celestron C8
SBIG ST8-XME / Clear / 180.0		-4.23 ± 1.15
HAT-P-18b (LOW - SPOTS)
2015-04-15		Ramon Naves
Montcabrer		Meade LX200 12" ACF
Sbig ST8xme / R / 300.0		-1.04 ± 2.16
HAT-P-18b (LOW - SPOTS)
2014-05-03		Alfonso Carreño Garceran
Observatorio Zonalunar		Long Perng
Atik 386L / Clear / 240.0		4.05 ± 2.74
HAT-P-18b (LOW - SPOTS)
2013-06-12		Ramon Naves
Montcabrer		Meade LX200 12" ACF
Sbig ST8xme / R / 120.0		3.04 ± 1.02

Space Observations
Planet
Observation Date		 Mission O-C
minutes
HAT-P-18b (LOW - SPOTS)
2020-07-02		TESS0.98 ± 0.86
HAT-P-18b (LOW - SPOTS)
2020-06-27		TESS-0.35 ± 0.89
HAT-P-18b (LOW - SPOTS)
2020-06-16		TESS-2.03 ± 0.92
HAT-P-18b (LOW - SPOTS)
2020-06-10		TESS-0.98 ± 0.71
HAT-P-18b (LOW - SPOTS)
2020-06-05		TESS-0.28 ± 0.75
HAT-P-18b (LOW - SPOTS)
2020-05-25		TESS-1.62 ± 0.78
HAT-P-18b (LOW - SPOTS)
2020-05-19		TESS-0.96 ± 0.88

Literature Mid-times
Planet
Observation Date		 Reference O-C
minutes
2017-05-30 Wang et al. 2021 0.69 ± 3.02
2016-05-15 Wang et al. 2021 -0.76 ± 0.78
2016-04-29 Kirk et al. 2017 -0.04 ± 0.09
2016-04-29 Kirk et al. 2017 -1.21 ± 0.28
2015-09-10 Vissapragada et al. 2022 0.91 ± 0.14
2013-04-28 Seeliger et al. 2015 0.49 ± 1.21
2012-05-05 Seeliger et al. 2015 -2.01 ± 1.21
2011-05-24 Seeliger et al. 2015 2.27 ± 1.15
2011-04-21 Seeliger et al. 2015 -0.69 ± 1.79
2008-09-05 Hartman et al. 2011 -0.85 ± 0.29
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