exoclock

KELT-20b (LOW)

Discovered by: Lund et al. 2017

The Star
Simbad
GAIA
2MASS		 HD 185603
DR2 2033123654092592384
J19383872+3113091
RA 19:38:38.7352 DEC +31:13:09.215
Parallax
7.301 mas		 P.M. RA
3.096 mas/y		 P.M. DEC
-6.157 mas/y
MagV
7.58		 MagR*
7.544		 MagI*
7.476		 MagJ
7.424		 MagH
7.446		 MagK
7.415
MagG
7.575		 MagGBP
7.625		 MagGRP
7.534
*Calculated from GAIA magnitudes.

Ephemeris - Verified True
Kokori et al. 2025
Mid-time
2459396.504891 ± 2.6e-05 BJDTDB
Period
3.47410057 ± 2.6e-07 days
Transit Parameters
Lund et al. 2017
Rp/Rs
0.1144 ± 0.00062		 a/Rs
7.5 +0.05 -0.05
 i
86.12 +0.28 -0.27 deg
e
-		 ω
- deg
DepthR*
15.61 mmag		 Duration*
3.53 hours
*Calculated from the other parameters, using PyLightcurve.
**Adjusted based on the space observations.

Limb Darkening Parameters
Lund et al. 2017
Teff
8720.0 +250.0 -260.0 K
 Log(g)
4.29 +0.02 -0.02 cm/s2
 Fe/H
-0.29 +0.22 -0.36 dex
ExoClock Status
Observing Priority LOW
Minimum aperture 5.0"
Total Observations (Recent) 42 (3)
O-C -0.51 ± 0.3 minutes
ExoClock Observations (Recent) 16 (3)
Space Observations (Recent) 23 (0)
ETD Observations (Recent) 0 (0)
Literature Mid-times (Recent) 3 (0)
Kepler Rp/Rs -
TESS Rp/Rs 0.115552 ± 5.2e-05

KELT-20b


ExoClock Observations
Planet
Observation Date		 Observer
Observatory		 Telescope
Camera / Filter / Exp [s]		 O-C
minutes
KELT-20b (LOW)
2026-08-20		Giovanni Calapai
Calapai Astronomical Observatory		Celestron C14
SBIG ST9XE / I / 90.0		2.06 ± 0.99
KELT-20b (LOW)
2026-08-13		Nicolò Maugeri
My Observatory		Sky-Watcher Explorer 150P
SVbony SV705C / Lum / 10.0		-4.17 ± 6.62
KELT-20b (LOW)
2026-06-21		Paolo Arcangelo Matassa
P:M.P.H.R. Deep Sky (K81)		Ritchey Chretien 40cm-F5.3
CCD ICX453AQ / R / 20.0		-2.48 ± 1.17
KELT-20b (LOW)
2025-07-19		Paolo Arcangelo Matassa
P:M.P.H.R. Deep Sky (K81)		Ritchey Chretien 40cm-F5.3
CCD ICX453AQ / R / 20.0		1.54 ± 1.58
KELT-20b (LOW)
2025-07-13		Adrian Schoner
TURMX Observatory		CFF Telescopes 160mm APO
ZWO ASI6200MM Pro / R / 10.0		0.74 ± 1.05
KELT-20b (LOW)
2025-07-06		Lorenzo Betti
Osservatorio Polifunzionale del Chianti		RC-80cm
Moravian G4 - KAF 09000 / R / 20.0		-0.88 ± 0.35
KELT-20b (LOW)
2024-05-29		Esteban Reina
Observatori de Masquefa		Meade LX200
ZWO ASI 294 MM Pro / I / 90.0		2.64 ± 1.87
KELT-20b (LOW)
2023-09-14		Patrick Wagner
Balkonien		SkyMax 127T
ZWO ASI 1600MM / R / 20.0		-0.03 ± 3.02
KELT-20b (LOW)
2023-07-17		Paolo Arcangelo Matassa
P:M.P.H.R. Deep Sky (K81)		Ritchey Chretien 40cm-F5.3
CCD ICX453AQ / R / 20.0		0.28 ± 0.88
KELT-20b (LOW)
2022-08-07		Michael Irzyk
Melun		C14
H694 / I / 30.0		-1.67 ± 1.01
KELT-20b (LOW)
2022-08-01		Anaël Wünsche
Observatoire des Baronnies Provençales		CDK Planewave 2
ZWO ASI6200 / R / 30.0		0.21 ± 1.01
KELT-20b (LOW)
2022-08-01		Michael Irzyk
Melun		C14
H694 / I / 40.0		-0.66 ± 0.58
KELT-20b (LOW)
2022-08-01		Lionel Rousselot
Private observatory Vierzon		Newton 250/1200
ZWO 1600 monochrome / R / 60.0		-2.38 ± 1.3
KELT-20b (LOW)
2022-08-01		Jean-Claude MARIO
Observatoire de la Cabergue		T 520 Cassegrain "Arp 83"
STL 11000 - KAI 11000 / Clear / 10.0		-2.53 ± 3.17
KELT-20b (LOW)
2022-08-01		Alvaro Fornas
Centro Astronómico Alto Turia (CAAT). MPC J57		Planewave CDK 17"
Sbig STXL 11002 / V / 60.0		-4.11 ± 1.01
KELT-20b (LOW)
2022-06-09		Fran Campos
Puig d'Agulles Observtory		RC14" on EQ8 German mount
SBIG ST-8XME / R / 90.0		-3.96 ± 2.45

Space Observations
Planet
Observation Date		 Mission O-C
minutes
KELT-20b (LOW)
2022-07-28		TESS0.11 ± 0.16
KELT-20b (LOW)
2022-07-25		TESS0.02 ± 0.14
KELT-20b (LOW)
2022-07-21		TESS-0.09 ± 0.16
KELT-20b (LOW)
2022-07-14		TESS0.47 ± 0.14
KELT-20b (LOW)
2022-07-11		TESS0.0 ± 0.14
KELT-20b (LOW)
2021-08-18		TESS0.05 ± 0.14
KELT-20b (LOW)
2021-08-15		TESS0.09 ± 0.13
KELT-20b (LOW)
2021-08-11		TESS0.03 ± 0.14
KELT-20b (LOW)
2021-08-04		TESS0.0 ± 0.16
KELT-20b (LOW)
2021-08-01		TESS0.07 ± 0.13
KELT-20b (LOW)
2021-07-28		TESS0.1 ± 0.13
KELT-20b (LOW)
2021-07-25		TESS0.17 ± 0.16
KELT-20b (LOW)
2021-07-21		TESS-0.35 ± 0.14
KELT-20b (LOW)
2021-07-18		TESS0.08 ± 0.13
KELT-20b (LOW)
2021-07-14		TESS-0.05 ± 0.14
KELT-20b (LOW)
2021-07-11		TESS-0.12 ± 0.14
KELT-20b (LOW)
2021-07-07		TESS0.04 ± 0.14
KELT-20b (LOW)
2021-07-04		TESS-0.28 ± 0.14
KELT-20b (LOW)
2021-07-01		TESS-0.15 ± 0.17
KELT-20b (LOW)
2021-06-27		TESS-0.19 ± 0.13
KELT-20b (LOW)
2019-08-06		TESS0.12 ± 0.16
KELT-20b (LOW)
2019-08-02		TESS-0.01 ± 0.19
KELT-20b (LOW)
2019-07-19		TESS0.17 ± 0.17

Literature Mid-times
Planet
Observation Date		 Reference O-C
minutes
2018-09-30 Casasayas-Barris et al. 2019 -0.73 ± 0.6
2018-07-13 Casasayas-Barris et al. 2019 0.21 ± 0.32
2016-04-24 Lund et al. 2017 -0.04 ± 0.27
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