ExoClock

The Star
Simbad GAIA 2MASS	Kepler-18 DR2 2079295583282164992 J19521906+4444467
RA	19:52:19.0688		DEC	+44:44:46.807
Parallax 2.28 mas		P.M. RA -1.432 mas/y		P.M. DEC -20.313 mas/y
Mag_V 13.767	Mag_R 13.93	Mag_I^* 12.843	Mag_J 12.189	Mag_H 11.873	Mag_K 11.756
Mag_G 13.539		Mag_{G_BP} 14.003		Mag_{G_RP} 12.938
^*Calculated from GAIA magnitudes.

Ephemeris - Verified
Kokori et al. 2025
Mid-time 2455704.09998 ± 0.00026 BJD_TDB
Period 14.8589225 ± 9.2e-06 days
Transit Parameters
Cochran et al. 2011
R_p/R_s 0.0578 ± 0.0007	a/R_s 22.5 +1.0 -1.0		i 88.07 +0.1 -0.1 deg
R_p/R_s 0.0578 ± 0.0007	e -		ω - deg
Depth_R^* 3.62 mmag		Duration^* 3.73 hours
^Calculated from the other parameters, using PyLightcurve. ^*Adjusted based on the space observations.
Limb Darkening Parameters
Cochran et al. 2011
T_eff 5345.0 +100.0 -100.0 K	Log(g) 4.31 +0.12 -0.12 cm/s²		Fe/H 0.19 +0.06 -0.06 dex

ExoClock Status
Observing Priority		HIGH - TTVs
Minimum aperture		37.58"
Total Observations (Recent)		82 (0)
O-C		-
ExoClock Observations (Recent)		0 (0)
Space Observations (Recent)		82 (0)
ETD Observations (Recent)		0 (0)
Literature Mid-times (Recent)		0 (0)
Kepler R_p/R_s		0.05747 ± 0.0001
TESS R_p/R_s		0.0916 ± 0.0096

Planet Observation Date	Mission	O-C minutes
Space Observations
Kepler-18d (HIGH - TTVs) 2019-07-26	TESS	8.49 ± 8.21
Kepler-18d (HIGH - TTVs) 2013-04-19	KEPLER	2.54 ± 1.3
Kepler-18d (HIGH - TTVs) 2013-04-05	KEPLER	3.43 ± 1.44
Kepler-18d (HIGH - TTVs) 2013-03-21	KEPLER	3.77 ± 1.22
Kepler-18d (HIGH - TTVs) 2013-02-19	KEPLER	0.65 ± 1.58
Kepler-18d (HIGH - TTVs) 2013-02-04	KEPLER	-0.54 ± 1.34
Kepler-18d (HIGH - TTVs) 2013-01-05	KEPLER	-4.0 ± 1.73
Kepler-18d (HIGH - TTVs) 2012-12-22	KEPLER	-3.55 ± 1.14
Kepler-18d (HIGH - TTVs) 2012-11-22	KEPLER	-8.08 ± 2.02
Kepler-18d (HIGH - TTVs) 2012-11-07	KEPLER	-5.46 ± 1.4
Kepler-18d (HIGH - TTVs) 2012-10-23	KEPLER	-2.98 ± 2.02
Kepler-18d (HIGH - TTVs) 2012-10-08	KEPLER	-5.1 ± 1.73
Kepler-18d (HIGH - TTVs) 2012-09-23	KEPLER	-3.4 ± 1.41
Kepler-18d (HIGH - TTVs) 2012-09-09	KEPLER	1.14 ± 1.2
Kepler-18d (HIGH - TTVs) 2012-08-25	KEPLER	1.39 ± 0.99
Kepler-18d (HIGH - TTVs) 2012-08-10	KEPLER	2.37 ± 1.73
Kepler-18d (HIGH - TTVs) 2012-07-26	KEPLER	4.68 ± 1.31
Kepler-18d (HIGH - TTVs) 2012-07-11	KEPLER	5.31 ± 1.87
Kepler-18d (HIGH - TTVs) 2012-06-26	KEPLER	4.77 ± 1.73
Kepler-18d (HIGH - TTVs) 2012-06-11	KEPLER	2.97 ± 1.25
Kepler-18d (HIGH - TTVs) 2012-05-28	KEPLER	1.49 ± 1.05
Kepler-18d (HIGH - TTVs) 2012-05-13	KEPLER	0.59 ± 1.31
Kepler-18d (HIGH - TTVs) 2012-04-13	KEPLER	-2.1 ± 1.28
Kepler-18d (HIGH - TTVs) 2012-03-29	KEPLER	-2.96 ± 1.87
Kepler-18d (HIGH - TTVs) 2012-03-14	KEPLER	-3.79 ± 1.58
Kepler-18d (HIGH - TTVs) 2012-02-28	KEPLER	-5.77 ± 2.02
Kepler-18d (HIGH - TTVs) 2012-02-14	KEPLER	-3.19 ± 1.17
Kepler-18d (HIGH - TTVs) 2012-01-30	KEPLER	-2.54 ± 1.58
Kepler-18d (HIGH - TTVs) 2012-01-15	KEPLER	-1.43 ± 1.4
Kepler-18d (HIGH - TTVs) 2011-12-31	KEPLER	-1.58 ± 1.31
Kepler-18d (HIGH - TTVs) 2011-12-16	KEPLER	-0.02 ± 1.44
Kepler-18d (HIGH - TTVs) 2011-11-16	KEPLER	3.67 ± 1.58
Kepler-18d (HIGH - TTVs) 2011-11-02	KEPLER	1.63 ± 1.18
Kepler-18d (HIGH - TTVs) 2011-10-18	KEPLER	6.04 ± 1.58
Kepler-18d (HIGH - TTVs) 2011-10-03	KEPLER	0.63 ± 1.34
Kepler-18d (HIGH - TTVs) 2011-09-18	KEPLER	2.97 ± 1.31
Kepler-18d (HIGH - TTVs) 2011-09-03	KEPLER	0.95 ± 1.73
Kepler-18d (HIGH - TTVs) 2011-08-19	KEPLER	0.66 ± 1.22
Kepler-18d (HIGH - TTVs) 2011-07-21	KEPLER	-0.09 ± 1.34
Kepler-18d (HIGH - TTVs) 2011-06-21	KEPLER	-3.06 ± 1.22
Kepler-18d (HIGH - TTVs) 2011-06-06	KEPLER	-5.48 ± 1.44
Kepler-18d (HIGH - TTVs) 2011-05-22	KEPLER	-3.93 ± 1.3
Kepler-18d (HIGH - TTVs) 2011-04-08	KEPLER	-0.82 ± 1.14
Kepler-18d (HIGH - TTVs) 2011-03-24	KEPLER	-1.07 ± 0.92
Kepler-18d (HIGH - TTVs) 2011-03-09	KEPLER	4.51 ± 1.58
Kepler-18d (HIGH - TTVs) 2011-02-22	KEPLER	-0.93 ± 1.35
Kepler-18d (HIGH - TTVs) 2011-02-07	KEPLER	4.58 ± 1.58
Kepler-18d (HIGH - TTVs) 2011-01-23	KEPLER	5.56 ± 1.01
Kepler-18d (HIGH - TTVs) 2011-01-08	KEPLER	3.06 ± 2.74
Kepler-18d (HIGH - TTVs) 2010-12-10	KEPLER	2.83 ± 1.73
Kepler-18d (HIGH - TTVs) 2010-11-25	KEPLER	0.99 ± 2.16
Kepler-18d (HIGH - TTVs) 2010-10-26	KEPLER	-3.41 ± 2.02
Kepler-18d (HIGH - TTVs) 2010-10-11	KEPLER	-2.65 ± 2.16
Kepler-18d (HIGH - TTVs) 2010-09-26	KEPLER	-4.82 ± 1.12
Kepler-18d (HIGH - TTVs) 2010-09-11	KEPLER	-5.41 ± 1.32
Kepler-18d (HIGH - TTVs) 2010-08-28	KEPLER	-5.25 ± 1.37
Kepler-18d (HIGH - TTVs) 2010-08-13	KEPLER	-4.11 ± 1.44
Kepler-18d (HIGH - TTVs) 2010-07-29	KEPLER	-3.36 ± 1.58
Kepler-18d (HIGH - TTVs) 2010-07-14	KEPLER	2.73 ± 2.3
Kepler-18d (HIGH - TTVs) 2010-06-29	KEPLER	-3.15 ± 2.02
Kepler-18d (HIGH - TTVs) 2010-06-14	KEPLER	-0.67 ± 1.32
Kepler-18d (HIGH - TTVs) 2010-05-30	KEPLER	1.81 ± 1.25
Kepler-18d (HIGH - TTVs) 2010-05-16	KEPLER	3.43 ± 2.02
Kepler-18d (HIGH - TTVs) 2010-05-01	KEPLER	4.46 ± 1.05
Kepler-18d (HIGH - TTVs) 2010-04-16	KEPLER	6.04 ± 1.4
Kepler-18d (HIGH - TTVs) 2010-04-01	KEPLER	2.52 ± 0.88
Kepler-18d (HIGH - TTVs) 2010-03-17	KEPLER	0.62 ± 1.4
Kepler-18d (HIGH - TTVs) 2010-03-02	KEPLER	0.3 ± 1.15
Kepler-18d (HIGH - TTVs) 2010-02-01	KEPLER	-1.67 ± 1.73
Kepler-18d (HIGH - TTVs) 2010-01-17	KEPLER	-4.81 ± 1.44
Kepler-18d (HIGH - TTVs) 2010-01-02	KEPLER	-4.11 ± 1.41
Kepler-18d (HIGH - TTVs) 2009-12-03	KEPLER	-2.12 ± 1.58
Kepler-18d (HIGH - TTVs) 2009-11-03	KEPLER	8.89 ± 5.04
Kepler-18d (HIGH - TTVs) 2009-10-05	KEPLER	1.15 ± 1.31
Kepler-18d (HIGH - TTVs) 2009-09-20	KEPLER	1.93 ± 1.58
Kepler-18d (HIGH - TTVs) 2009-09-05	KEPLER	1.68 ± 1.44
Kepler-18d (HIGH - TTVs) 2009-08-21	KEPLER	4.01 ± 1.73
Kepler-18d (HIGH - TTVs) 2009-07-22	KEPLER	1.24 ± 1.04
Kepler-18d (HIGH - TTVs) 2009-07-08	KEPLER	4.69 ± 2.02
Kepler-18d (HIGH - TTVs) 2009-06-23	KEPLER	-0.61 ± 1.58
Kepler-18d (HIGH - TTVs) 2009-06-08	KEPLER	-2.16 ± 1.22
Kepler-18d (HIGH - TTVs) 2009-05-09	KEPLER	-3.66 ± 1.3

Kepler-18d (HIGH - TTVs)

Discovered by: Cochran et al. 2011

Space Observations