exoclock

KELT-9b (LOW - TTVs - GD)

Discovered by: Gaudi et al. 2017

The Star
Simbad
GAIA
2MASS		 HD 195689
DR2 2064327278651198336
J20312634+3956196
RA 20:31:26.3534 DEC +39:56:19.765
Parallax
4.863 mas		 P.M. RA
16.728 mas/y		 P.M. DEC
21.478 mas/y
MagV
7.56		 MagR*
7.562		 MagI*
7.49		 MagJ
7.458		 MagH
7.492		 MagK
7.482
MagG
7.577		 MagGBP
7.611		 MagGRP
7.563
*Calculated from GAIA magnitudes.

Ephemeris - Verified True
Kokori et al. 2025
Mid-time
2459074.460549 ± 5e-05 BJDTDB
Period
1.48111897 ± 1.3e-07 days
Transit Parameters
Gaudi et al. 2017
Rp/Rs
0.08228 ± 0.00043		 a/Rs
3.2 +0.02 -0.02
 i
86.79 +0.25 -0.25 deg
e
-		 ω
- deg
DepthR*
8.28 mmag		 Duration*
3.85 hours
*Calculated from the other parameters, using PyLightcurve.
**Adjusted based on the space observations.

Limb Darkening Parameters
Gaudi et al. 2017
Teff
10170.0 +450.0 -450.0 K
 Log(g)
4.09 +0.01 -0.01 cm/s2
 Fe/H
-0.03 +0.2 -0.2 dex
ExoClock Status
Observing Priority LOW - TTVs - GD
Minimum aperture 5.0"
Total Observations (Recent) 90 (7)
O-C 3.35 ± 0.63 minutes
ExoClock Observations (Recent) 26 (7)
Space Observations (Recent) 58 (0)
ETD Observations (Recent) 1 (0)
Literature Mid-times (Recent) 5 (0)
Kepler Rp/Rs -
TESS Rp/Rs 0.080414 ± 4.6e-05

KELT-9b


ExoClock Observations
Planet
Observation Date		 Observer
Observatory		 Telescope
Camera / Filter / Exp [s]		 O-C
minutes
KELT-9b (LOW - TTVs - GD)
2025-10-12		Michael Irzyk
melun		C14
altair 2600 / ipr / 15.0		0.02 ± 1.31
KELT-9b (LOW - TTVs - GD)
2025-08-30		samuel Diaz Lopez
Tomas Lopez (AstroCamp)		SCA260
ASI2600MM / ipr / 30.0		6.38 ± 2.3
KELT-9b (LOW - TTVs - GD)
2025-08-30		Javier Flores Martín
Calar Alto Hispano en Andalucia		Multi Array of Combinate Telescope (MARCOT)
ZWO1600MM / R / 60.0		1.49 ± 6.77
KELT-9b (LOW - TTVs - GD)
2025-08-30		Paolo Arcangelo Matassa
P:M.P.H.R. Deep Sky (K81)		Ritchey Chretien 40cm-F5.3
CCD ICX453AQ / R / 20.0		1.06 ± 2.59
KELT-9b (LOW - TTVs - GD)
2025-07-18		Giovanni Calapai
Home Astronomical Observatory		Celestron 11 Schmidt-Cassegrain
Atik 314L+ / Clear / 90.0		2.71 ± 1.73
KELT-9b (LOW - TTVs - GD)
2025-07-16		Miguel Ángel Álava Amat
Sarriguren		Meade SC 8"
Asi 1600 MM / rpr / 120.0		0.61 ± 1.58
KELT-9b (LOW - TTVs - GD)
2025-06-11		Paolo Arcangelo Matassa
P:M.P.H.R. Deep Sky (K81)		Ritchey Chretien 40cm-F5.3
CCD ICX453AQ / R / 20.0		7.28 ± 2.45
KELT-9b (LOW - TTVs - GD)
2024-09-08		Paolo Arcangelo Matassa
P:M.P.H.R. Deep Sky (K81)		Ritchey Chretien 40cm-F5.3
CCD ICX453AQ / Lum / 20.0		-4.89 ± 3.6
KELT-9b (LOW - TTVs - GD)
2024-07-30		Sonia J Rubie
The Burnham Observatory		Celestron C9.25 (9.25")
SX694 Mono / R / 10.0		11.4 ± 1.44
KELT-9b (LOW - TTVs - GD)
2024-06-22		Paolo Arcangelo Matassa
P:M.P.H.R. Deep Sky (K81)		Ritchey Chretien 40cm-F5.3
CCD ICX453AQ / R / 20.0		-2.32 ± 2.59
KELT-9b (LOW - TTVs - GD)
2023-11-13		Javier Alonso Santiago
INAF-OACT		Cassegrain 91cm
Moravian C4-1600EC / R / 4.0		-0.71 ± 1.17
KELT-9b (LOW - TTVs - GD)
2023-08-13		Manfred Raetz
privat observatory Herges-Hallenberg		SCT 280/1850 (C11 with Starizona reducer)
Moravian Instruments G2-1600 / R / 120.0		4.96 ± 1.34
KELT-9b (LOW - TTVs - GD)
2023-07-07		Manfred Raetz
privat observatory Herges-Hallenberg		SCT 280/1850 (C11 with Starizona reducer)
Moravian Instruments G2-1600 / R / 120.0		2.23 ± 0.72
KELT-9b (LOW - TTVs - GD)
2022-08-27		Michael Irzyk
Melun		C14
H694 / I / 30.0		1.6 ± 1.73
KELT-9b (LOW - TTVs - GD)
2022-08-27		Lionel Rousselot
Private observatory Vierzon		Newton 250/1200
ZWO 1600 monochrome / R / 60.0		-0.56 ± 1.3
KELT-9b (LOW - TTVs - GD)
2022-08-24		Lorenzo Betti
Osservatorio Polifunzionale del Chianti		RC-80cm
Moravian G4 - KAF 09000 / R / 40.0		1.08 ± 0.43
KELT-9b (LOW - TTVs - GD)
2022-07-18		Miguel Ángel Álava Amat
Sarriguren		Meade SC 8"
Asi 1600 MM / rpr / 120.0		-5.3 ± 4.61
KELT-9b (LOW - TTVs - GD)
2022-07-16		Alvaro Fornas
Centro Astronómico Alto Turia (CAAT). MPC J57		Planewave CDK 17"
Sbig STXL 11002 / V / 60.0		-2.94 ± 1.01
KELT-9b (LOW - TTVs - GD)
2022-07-16		Fran Campos
Puig d'Agulles Observtory		RC14" on EQ8 German mount
SBIG ST-8XME / R / 20.0		-3.23 ± 1.3
KELT-9b (LOW - TTVs - GD)
2022-07-16		Enrique Arce
Vallbona Observatory		Newton 10" f4
ZWO ASI 294 MM PRO / Lum / 30.0		-12.59 ± 3.02
KELT-9b (LOW - TTVs - GD)
2022-07-13		Alvaro Fornas
Centro Astronómico Alto Turia (CAAT). MPC J57		Planewave CDK 17"
Sbig STXL 11002 / V / 60.0		-0.44 ± 1.01
KELT-9b (LOW - TTVs - GD)
2018-08-30		MUSCAT Team
Teide Observatory		Telescope Carlos Sanchez
MuSCAT2 - PIXIS: 1024B - CH2 r / rpr / 2.0		1.04 ± 0.63
KELT-9b (LOW - TTVs - GD)
2018-08-30		MUSCAT Team
Teide Observatory		Telescope Carlos Sanchez
MuSCAT2 - PIXIS: 1024B eXcelon - CH3 i / ipr / 3.0		0.12 ± 0.58
KELT-9b (LOW - TTVs - GD)
2018-08-30		MUSCAT Team
Teide Observatory		Telescope Carlos Sanchez
MuSCAT2 - PIXIS: 1024B eXcelon - CH1 g / gpr / 5.0		0.11 ± 0.81
KELT-9b (LOW - TTVs - GD)
2018-08-30		MUSCAT Team
Teide Observatory		Telescope Carlos Sanchez
MuSCAT2 - PIXIS: 1024B eXcelon - CH4 z / zpr / 8.0		0.04 ± 0.55
KELT-9b (LOW - TTVs - GD)
2018-06-08		MUSCAT Team
Teide Observatory		Telescope Carlos Sanchez
MuSCAT2 - PIXIS: 1024B eXcelon - CH1 g / gpr / 5.0		-4.12 ± 1.27

Space Observations
Planet
Observation Date		 Mission O-C
minutes
KELT-9b (LOW - TTVs - GD)
2022-09-01		TESS0.74 ± 0.26
KELT-9b (LOW - TTVs - GD)
2022-08-30		TESS-0.65 ± 0.27
KELT-9b (LOW - TTVs - GD)
2022-08-29		TESS-0.69 ± 0.29
KELT-9b (LOW - TTVs - GD)
2022-08-27		TESS-0.03 ± 0.24
KELT-9b (LOW - TTVs - GD)
2022-08-26		TESS0.49 ± 0.24
KELT-9b (LOW - TTVs - GD)
2022-08-24		TESS-0.25 ± 0.27
KELT-9b (LOW - TTVs - GD)
2022-08-23		TESS0.3 ± 0.23
KELT-9b (LOW - TTVs - GD)
2022-08-22		TESS0.35 ± 0.27
KELT-9b (LOW - TTVs - GD)
2022-08-20		TESS-0.22 ± 0.24
KELT-9b (LOW - TTVs - GD)
2022-08-17		TESS0.32 ± 0.24
KELT-9b (LOW - TTVs - GD)
2022-08-16		TESS-0.93 ± 0.26
KELT-9b (LOW - TTVs - GD)
2022-08-14		TESS-0.79 ± 0.26
KELT-9b (LOW - TTVs - GD)
2022-08-13		TESS0.26 ± 0.24
KELT-9b (LOW - TTVs - GD)
2022-08-11		TESS-0.82 ± 0.27
KELT-9b (LOW - TTVs - GD)
2022-08-10		TESS-0.25 ± 0.24
KELT-9b (LOW - TTVs - GD)
2022-08-08		TESS0.18 ± 0.24
KELT-9b (LOW - TTVs - GD)
2022-08-07		TESS0.12 ± 0.24
KELT-9b (LOW - TTVs - GD)
2021-08-19		TESS-0.13 ± 0.26
KELT-9b (LOW - TTVs - GD)
2021-08-18		TESS-0.77 ± 0.26
KELT-9b (LOW - TTVs - GD)
2021-08-16		TESS-0.1 ± 0.26
KELT-9b (LOW - TTVs - GD)
2021-08-15		TESS0.35 ± 0.23
KELT-9b (LOW - TTVs - GD)
2021-08-13		TESS-0.45 ± 0.24
KELT-9b (LOW - TTVs - GD)
2021-08-12		TESS-0.22 ± 0.24
KELT-9b (LOW - TTVs - GD)
2021-08-10		TESS-0.67 ± 0.23
KELT-9b (LOW - TTVs - GD)
2021-08-09		TESS-0.56 ± 0.26
KELT-9b (LOW - TTVs - GD)
2021-08-07		TESS-0.31 ± 0.24
KELT-9b (LOW - TTVs - GD)
2021-08-04		TESS-0.52 ± 0.26
KELT-9b (LOW - TTVs - GD)
2021-08-03		TESS-0.32 ± 0.24
KELT-9b (LOW - TTVs - GD)
2021-08-01		TESS0.8 ± 0.23
KELT-9b (LOW - TTVs - GD)
2021-07-31		TESS-0.32 ± 0.24
KELT-9b (LOW - TTVs - GD)
2021-07-29		TESS0.17 ± 0.26
KELT-9b (LOW - TTVs - GD)
2021-07-28		TESS-0.24 ± 0.24
KELT-9b (LOW - TTVs - GD)
2021-07-27		TESS-0.33 ± 0.24
KELT-9b (LOW - TTVs - GD)
2021-07-25		TESS-0.6 ± 0.24
KELT-9b (LOW - TTVs - GD)
2019-09-07		TESS-0.64 ± 0.27
KELT-9b (LOW - TTVs - GD)
2019-09-05		TESS0.42 ± 0.24
KELT-9b (LOW - TTVs - GD)
2019-09-04		TESS0.29 ± 0.27
KELT-9b (LOW - TTVs - GD)
2019-09-02		TESS-0.29 ± 0.29
KELT-9b (LOW - TTVs - GD)
2019-09-01		TESS-0.4 ± 0.27
KELT-9b (LOW - TTVs - GD)
2019-08-30		TESS-0.76 ± 0.3
KELT-9b (LOW - TTVs - GD)
2019-08-24		TESS-0.01 ± 0.39
KELT-9b (LOW - TTVs - GD)
2019-08-23		TESS-0.18 ± 0.29
KELT-9b (LOW - TTVs - GD)
2019-08-22		TESS0.54 ± 0.26
KELT-9b (LOW - TTVs - GD)
2019-08-20		TESS-0.2 ± 0.26
KELT-9b (LOW - TTVs - GD)
2019-08-19		TESS-0.21 ± 0.33
KELT-9b (LOW - TTVs - GD)
2019-08-17		TESS0.59 ± 0.3
KELT-9b (LOW - TTVs - GD)
2019-08-16		TESS0.04 ± 0.29
KELT-9b (LOW - TTVs - GD)
2019-08-13		TESS-0.29 ± 0.24
KELT-9b (LOW - TTVs - GD)
2019-08-08		TESS-0.08 ± 0.24
KELT-9b (LOW - TTVs - GD)
2019-08-07		TESS0.48 ± 0.26
KELT-9b (LOW - TTVs - GD)
2019-08-05		TESS-1.05 ± 0.3
KELT-9b (LOW - TTVs - GD)
2019-08-04		TESS0.25 ± 0.27
KELT-9b (LOW - TTVs - GD)
2019-08-02		TESS-0.09 ± 0.24
KELT-9b (LOW - TTVs - GD)
2019-07-30		TESS-0.48 ± 0.24
KELT-9b (LOW - TTVs - GD)
2019-07-24		TESS0.7 ± 0.3
KELT-9b (LOW - TTVs - GD)
2019-07-23		TESS-0.75 ± 0.29
KELT-9b (LOW - TTVs - GD)
2019-07-21		TESS-1.11 ± 0.27
KELT-9b (LOW - TTVs - GD)
2019-07-20		TESS0.35 ± 0.26

ETD Observations
Planet
Observation Date		 Observer(s) ETD link O-C
minutes
KELT-9b (LOW - TTVs - GD)
2019-08-27		Arena C. - Gruppo Astrofili Catanesi15676275560.21 ± 3.17

Literature Mid-times
Planet
Observation Date		 Reference O-C
minutes
2020-09-02 Jones et al. 2022 1.2 ± 0.09
2019-03-23 Pai Asnodkar et al. 2022 -0.26 ± 0.07
2018-10-23 Jones et al. 2022 0.36 ± 0.22
2018-10-23 Mansfield et al. 2020 0.0 ± 0.23
2015-03-14 Gaudi et al. 2017 0.17 ± 0.2
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