exoclock

HAT-P-18b

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. 2021
Mid-time
2457276.25646 ± 0.0001 BJDTDB
Period
5.50803 ± 8e-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 to produce a duration that matches the 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
ExoClock Observations (Recent)
Space Observations
Literature Mid-times
ETD Observations
O-C minutes
MEDIUM
5 (2)

7

-1.3±0.6

HAT-P-18b


ExoClock Observations

Observation
Date
Observer
Observatory
Telescope
Camera / Filter / Exp [s]
O-C
minutes
2021-08-19 Tõnis Eenmäe
Tartu Observatory
Planewave CDK 12.5
Apogee Alta U42 / R / 90.0
-0.5 ± 1.4
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
-0.2 ± 1.0
2021-05-18 Billy Edwards
McDonald Observatory
LCO Meade
SBIG STX6303 / r' / 90.288
-1.0 ± 1.4
2019-02-23 Yves Jongen
Rasteau Observatory
Plane Wave CDK 17"
SBIG STXL 11002 / Clear / 120.0
-0.9 ± 1.9 - Data available
2015-05-07 Marc Deldem
Les Barres Observatory
Celestron C8
SBIG ST8-XME / Clear / 180.0
-4.0 ± 1.2 - Data available


Literature Mid-times

Observation
Date
Mid-time Time format Reference O-C
minutes
2016-04-29 2457507.59300891 ± 6e-05 BJD_UTC Kirk et al. 2017 0.1 ± 0.1
2016-04-29 2457507.59219566 ± 0.000194 BJD_UTC Kirk et al. 2017 -1.1 ± 0.3
2013-04-28 2456411.49638 ± 0.00084 BJD_TDB Seeliger et al. 2015 0.9 ± 1.2
2012-05-05 2456053.47276 ± 0.00084 BJD_TDB Seeliger et al. 2015 -1.5 ± 1.2
2011-05-24 2455706.46993 ± 0.0008 BJD_TDB Seeliger et al. 2015 2.9 ± 1.2
2011-04-21 2455673.41967 ± 0.00124 BJD_TDB Seeliger et al. 2015 -0.1 ± 1.8
2008-09-05 2454715.02174 ± 0.0002 BJD_UTC Hartman et al. 2011 -0.0 ± 0.3
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