exoclock

HAT-P-18b (LOW)

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. 2022
Mid-time
2457408.449133 ± 8.1e-05 BJDTDB
Period
5.50802941 ± 5.3e-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
Minimum aperture 6.93"
Total Observations (Recent) 45 (16)
O-C -0.19 ± 0.28 minutes
ExoClock Observations (Recent) 29 (16)
Space Observations (Recent) 7 (0)
ETD Observations (Recent) 0 (0)
Literature Mid-times (Recent) 9 (0)
Kepler Rp/Rs -
TESS Rp/Rs 0.13617 ± 0.00078

HAT-P-18b


ExoClock Observations

Planet
Observation Date
Observer
Observatory
Telescope
Camera / Filter / Exp [s]
O-C
minutes
HAT-P-18b (LOW)
2024-07-28
Michael Irzyk
Melun
C14
H694 / Clear / 90.0
2.0 ± 0.86
HAT-P-18b (LOW)
2024-07-28
Michael Nezel
Celle Observatory
CDK 14
QHY 268M / R / 120.0
0.75 ± 0.82
HAT-P-18b (LOW)
2024-07-28
Ian Sharp
Ham Observatory
Celestron C9.25 Edge HD
Starlight Xpress Trius Pro SX694 / R / 90.0
0.33 ± 1.14
HAT-P-18b (LOW)
2024-07-28
Anaël Wünsche
Observatoire des Baronnies Provençales
CDK Planewave 2
ZWO ASI6200 / R / 120.0
-0.16 ± 0.89
HAT-P-18b (LOW)
2024-07-28
Stéphane Montchaud
Burgundy Observatory
Celestron 8
Zwo Asi 1600 / Lum / 120.0
-1.37 ± 2.3
HAT-P-18b (LOW)
2024-07-28
Adrian Jones
Private Observatory (I64)
Meade ACF 30cm
QSI 583 / R / 150.0
-1.45 ± 1.44
HAT-P-18b (LOW)
2024-07-28
Mercedes Correa
Sirius B
Meade
Moravian G2 1600 / R / 120.0
-2.56 ± 1.38
HAT-P-18b (LOW)
2024-07-17
Michael Nezel
Celle Observatory
CDK 14
QHY 268M / R / 60.0
-0.35 ± 1.12
HAT-P-18b (LOW)
2024-07-17
Ian Sharp
PixelSkies
Celestron C11 Edge HD
Starlight Xpress Trius Pro SX694 / R / 120.0
-2.0 ± 2.16
HAT-P-18b (LOW)
2024-07-17
Yves Jongen
Rasteau Observatory
Plane Wave CDK 17"
SBIG STXL 11002 / Lum / 180.0
-4.36 ± 1.43
HAT-P-18b (LOW)
2024-07-06
Deborah Smith
El Olivar, Gergal, Spain
William Optics GT81
ASI2600MM / R / 180.0
1.25 ± 3.17
HAT-P-18b (LOW)
2024-07-06
Dim Stouraitis
Galilaios
SCT
SXVF-H9 Starlight-Xpress / R / 100.0
0.82 ± 3.31
HAT-P-18b (LOW)
2024-07-06
Michael Nezel
Celle Observatory
CDK 14
QHY 268M / R / 60.0
0.5 ± 0.94
HAT-P-18b (LOW)
2024-06-03
Livia Moretti
Leavitt Observatory
Ritchey-Chrétien 10'' f/8
QHY268 / R / 180.0
-0.08 ± 2.45
HAT-P-18b (LOW)
2024-06-03
Paolo Arcangelo Matassa
P:M.P.H.R. Deep Sky (K81)
Ritchey Chretien 40cm-F5.3
CCD ICX453AQ / Lum / 60.0
-4.98 ± 1.87
HAT-P-18b (LOW)
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)
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)
2023-04-23
Darryl Madison
Ajijic Observatory
Celestron CPC 800 Edge HD
ZWO2400MC / Clear / 180.0
2.62 ± 2.16
HAT-P-18b (LOW)
2023-02-16
Miguel Ángel Álava Amat
Sarriguren
Meade SC 8"
Asi 1600 MM / Lum / 240.0
-4.1 ± 1.15
HAT-P-18b (LOW)
2022-08-01
Anaël Wünsche
Observatoire des Baronnies Provençales
CDK Planewave 2
ZWO ASI6200 / Clear / 120.0
-2.55 ± 0.86
HAT-P-18b (LOW)
2022-07-21
Dim Stouraitis
Galilaios
SCT
SXVF-H9 Starlight-Xpress / R / 60.0
1.86 ± 1.73
HAT-P-18b (LOW)
2022-07-10
Martin Mifsud
Manikata Observatory
Meade OTA
SBig ST10XME / Lum / 120.0
-1.37 ± 3.6
HAT-P-18b (LOW)
2021-08-19
Tõnis Eenmäe
Tartu Observatory
Planewave CDK 12.5
Apogee Alta U42 / R / 90.0
-0.17 ± 1.44
HAT-P-18b (LOW)
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
0.15 ± 1.01
HAT-P-18b (LOW)
2021-05-18
Billy Edwards
McDonald Observatory
LCO Meade
SBIG STX6303 / rpr / 90.288
-0.6 ± 1.44
HAT-P-18b (LOW)
2019-02-23
Yves Jongen
Rasteau Observatory
Plane Wave CDK 17"
SBIG STXL 11002 / Clear / 120.0
-0.67 ± 1.87
HAT-P-18b (LOW)
2015-05-07
Marc Deldem
Les Barres Observatory
Celestron C8
SBIG ST8-XME / Clear / 180.0
-3.96 ± 1.15
HAT-P-18b (LOW)
2015-04-15
Ramon Naves
Montcabrer
Meade LX200 12" ACF
Sbig ST8xme / R / 300.0
-0.77 ± 2.16
HAT-P-18b (LOW)
2013-06-12
Ramon Naves
Montcabrer
Meade LX200 12" ACF
Sbig ST8xme / R / 120.0
3.38 ± 1.02

Space Observations

Planet
Observation Date
Mission O-C
minutes
HAT-P-18b (LOW)
2020-07-02
TESS0.92 ± 0.79
HAT-P-18b (LOW)
2020-06-27
TESS-0.39 ± 0.86
HAT-P-18b (LOW)
2020-06-16
TESS-1.84 ± 0.95
HAT-P-18b (LOW)
2020-06-10
TESS-0.81 ± 0.72
HAT-P-18b (LOW)
2020-06-05
TESS-0.23 ± 0.75
HAT-P-18b (LOW)
2020-05-25
TESS-1.72 ± 0.78
HAT-P-18b (LOW)
2020-05-19
TESS-0.84 ± 0.88

Literature Mid-times

Planet
Observation Date
Reference O-C
minutes
2017-05-30 Wang et al. 2021 0.89 ± 3.02
2016-05-15 Wang et al. 2021 -0.52 ± 0.78
2016-04-29 Kirk et al. 2017 0.2 ± 0.09
2016-04-29 Kirk et al. 2017 -0.98 ± 0.28
2013-04-28 Seeliger et al. 2015 0.82 ± 1.21
2012-05-05 Seeliger et al. 2015 -1.64 ± 1.21
2011-05-24 Seeliger et al. 2015 2.67 ± 1.15
2011-04-21 Seeliger et al. 2015 -0.29 ± 1.79
2008-09-05 Hartman et al. 2011 -0.36 ± 0.29
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