ExoClock

The Star
Simbad GAIA 2MASS	HD 33643 DR2 181908842994567936 J05131092+3319054
RA	05:13:10.9287		DEC	+33:19:05.403
Parallax 7.288 mas		P.M. RA 10.622 mas/y		P.M. DEC -49.779 mas/y
Mag_V 8.54	Mag_R^* 8.279	Mag_I 8.129	Mag_J 7.739	Mag_H 7.58	Mag_K 7.543
Mag_G 8.452		Mag_{G_BP} 8.688		Mag_{G_RP} 8.113
^*Calculated from GAIA magnitudes.

Ephemeris - Verified
Kokori et al. 2022
Mid-time 2459109.138447 ± 5.1e-05 BJD_TDB
Period 2.7347656 ± 2e-07 days
Transit Parameters
Bieryla et al. 2015
R_p/R_s 0.091 ± 0.0006	a/R_s^** 5.53 +0.04 -0.04		i 83.8 +0.4 -0.4 deg
R_p/R_s 0.091 ± 0.0006	e -		ω - deg
Depth_R^* 9.83 mmag		Duration^* 3.49 hours
^Calculated from the other parameters, using PyLightcurve. ^*Adjusted based on the space observations.
Limb Darkening Parameters
Bieryla et al. 2015
T_eff 6789.0 +50.0 -49.0 K	Log(g) 4.15 +0.02 -0.02 cm/s²		Fe/H 0.14 +0.07 -0.08 dex

ExoClock Status
Observing Priority		LOW
Minimum aperture		5.0"
Total Observations (Recent)		64 (5)
O-C		-1.17 ± 0.78 minutes
ExoClock Observations (Recent)		20 (5)
Space Observations (Recent)		31 (0)
ETD Observations (Recent)		0 (0)
Literature Mid-times (Recent)		13 (0)
Kepler R_p/R_s		-
TESS R_p/R_s		0.08946 ± 7.4e-05

Planet Observation Date	Observer Observatory	Telescope Camera / Filter / Exp [s]	O-C minutes
ExoClock Observations
KELT-7b (LOW) 2023-12-22	Paolo Arcangelo Matassa P:M.P.H.R. Deep Sky (K81)	Ritchey Chretien 40cm-F5.3 CCD ICX453AQ / R / 30.0	-3.67 ± 1.58
KELT-7b (LOW) 2023-12-03	Claudio Lopresti Claudio Lopresti	Mak-Newton CCD Sbig ST10xme / R / 240.0	5.06 ± 2.02
KELT-7b (LOW) 2023-12-01	Adrian Jones Private Observatory (I64)	Meade ACF 30cm QSI 583 / R / 30.0	-1.63 ± 1.3
KELT-7b (LOW) 2023-12-01	Martin Crow Burnham Observatory	Celestron C9.25 SX694 mono / R / 15.0	-2.19 ± 1.73
KELT-7b (LOW) 2023-09-10	Paolo Arcangelo Matassa P:M.P.H.R. Deep Sky (K81)	Ritchey Chretien 40cm-F5.3 CCD ICX453AQ / R / 30.0	0.21 ± 3.89
KELT-7b (LOW) 2022-02-01	Paolo Arcangelo Matassa P:M.P.H.R. Deep Sky (K81)	Ritchey Chretien 40cm-F5.3 CCD ICX453AQ / Lum / 30.0	2.42 ± 1.87
KELT-7b (LOW) 2022-01-10	Dominique DANIEL La Montjoie	Celestron CGX C8 XLT Camera CMOS ZWO ASI294MC pro (color) / Clear / 60.0	0.59 ± 3.46
KELT-7b (LOW) 2021-11-09	Tõnis Eenmäe Tartu Observatory	Planewave CDK 12.5 Apogee Alta U42 / B / 20.0	1.9 ± 1.58
KELT-7b (LOW) 2020-12-15	Martin Crow Burnham Observatory	Celestron C9.25 SX694 mono / R / 4.0	6.18 ± 5.76
KELT-7b (LOW) 2020-11-24	Anaël Wünsche Observatoire des Baronnies Provençales	CDK Planewave SBIG STL11K / R / 30.0	0.45 ± 0.86
KELT-7b (LOW) 2020-11-13	Alessandro Nastasi Galhassin Robotic Telescope 1 (GRT1)	Officina Stellare RiLa 400 FLI ProLine 16803 / zpr / 30.0	2.27 ± 1.44
KELT-7b (LOW) 2019-12-31	Claudio Lopresti Claudio Lopresti	Mak-Newton CCD Sbig ST10xme / I / 240.0	0.12 ± 1.44
KELT-7b (LOW) 2019-01-15	Giuseppe Conzo Gruppo Astrofili Palidoro	Skywatcher 80ED ASI-178MM / Clear / 90.0	4.01 ± 1.3
KELT-7b (LOW) 2017-12-28	MUSCAT Team Teide Observatory	Telescope Carlos Sanchez MuSCAT2 - PIXIS: 1024B eXcelon - CH4 z / zpr / 15.0	-0.25 ± 0.62
KELT-7b (LOW) 2017-12-28	MUSCAT Team Teide Observatory	Telescope Carlos Sanchez MuSCAT2 - PIXIS: 1024B eXcelon - CH3 i / ipr / 20.0	-0.34 ± 0.58
KELT-7b (LOW) 2017-12-28	MUSCAT Team Teide Observatory	Telescope Carlos Sanchez MuSCAT2 - PIXIS: 1024B eXcelon - CH1 g / gpr / 5.0	-1.0 ± 0.63
KELT-7b (LOW) 2017-12-28	MUSCAT Team Teide Observatory	Telescope Carlos Sanchez MuSCAT2 - PIXIS: 1024B - CH2 r / rpr / 10.0	-1.75 ± 0.6
KELT-7b (LOW) 2017-12-17	MUSCAT Team Teide Observatory	Telescope Carlos Sanchez MuSCAT2 - PIXIS: 1024B eXcelon - CH1 g / gpr / 5.0	4.33 ± 0.78
KELT-7b (LOW) 2017-12-17	MUSCAT Team Teide Observatory	Telescope Carlos Sanchez MuSCAT2 - PIXIS: 1024B - CH2 r / rpr / 10.0	1.21 ± 0.84
KELT-7b (LOW) 2017-12-17	MUSCAT Team Teide Observatory	Telescope Carlos Sanchez MuSCAT2 - PIXIS: 1024B eXcelon - CH4 z / zpr / 15.0	0.7 ± 0.66
Space Observations
Planet Observation Date	Mission		O-C minutes
KELT-7b (LOW) 2021-11-30	TESS		0.23 ± 0.33
KELT-7b (LOW) 2021-11-28	TESS		-0.47 ± 0.3
KELT-7b (LOW) 2021-11-25	TESS		0.25 ± 0.33
KELT-7b (LOW) 2021-11-22	TESS		0.27 ± 0.29
KELT-7b (LOW) 2021-11-17	TESS		0.36 ± 0.29
KELT-7b (LOW) 2021-11-14	TESS		-0.19 ± 0.29
KELT-7b (LOW) 2021-11-11	TESS		-0.07 ± 0.29
KELT-7b (LOW) 2021-11-09	TESS		0.2 ± 0.29
KELT-7b (LOW) 2021-10-31	TESS		-0.59 ± 0.29
KELT-7b (LOW) 2021-10-29	TESS		-0.78 ± 0.35
KELT-7b (LOW) 2021-10-26	TESS		-0.11 ± 0.29
KELT-7b (LOW) 2021-10-23	TESS		-0.45 ± 0.29
KELT-7b (LOW) 2021-10-20	TESS		-0.04 ± 0.27
KELT-7b (LOW) 2021-10-18	TESS		0.09 ± 0.29
KELT-7b (LOW) 2021-10-15	TESS		-0.09 ± 0.27
KELT-7b (LOW) 2021-10-09	TESS		-0.06 ± 0.27
KELT-7b (LOW) 2021-10-07	TESS		-0.1 ± 0.3
KELT-7b (LOW) 2021-10-04	TESS		0.34 ± 0.29
KELT-7b (LOW) 2021-10-01	TESS		0.8 ± 0.3
KELT-7b (LOW) 2021-09-26	TESS		0.21 ± 0.29
KELT-7b (LOW) 2021-09-23	TESS		0.07 ± 0.29
KELT-7b (LOW) 2021-09-20	TESS		0.11 ± 0.29
KELT-7b (LOW) 2021-09-18	TESS		-0.37 ± 0.3
KELT-7b (LOW) 2019-12-20	TESS		-0.0 ± 0.35
KELT-7b (LOW) 2019-12-18	TESS		0.12 ± 0.4
KELT-7b (LOW) 2019-12-15	TESS		-0.59 ± 0.32
KELT-7b (LOW) 2019-12-12	TESS		-0.2 ± 0.37
KELT-7b (LOW) 2019-12-09	TESS		-0.25 ± 0.3
KELT-7b (LOW) 2019-12-07	TESS		0.43 ± 0.27
KELT-7b (LOW) 2019-12-04	TESS		-0.13 ± 0.3
KELT-7b (LOW) 2019-12-01	TESS		0.37 ± 0.32
Literature Mid-times
Planet Observation Date	Reference		O-C minutes
2017-10-18	Pluriel et al. 2020		3.25 ± 0.9
2017-01-04	Garhart et al. 2020		0.32 ± 0.27
2016-12-27	Garhart et al. 2020		-0.6 ± 0.23
2014-01-23	Bieryla et al. 2015		2.02 ± 1.44
2013-10-19	Bieryla et al. 2015		1.7 ± 0.78
2013-01-29	Bieryla et al. 2015		2.04 ± 0.98
2013-01-27	Bieryla et al. 2015		1.92 ± 0.98
2012-12-08	Bieryla et al. 2015		-0.19 ± 0.92
2012-11-22	Bieryla et al. 2015		2.82 ± 1.05
2012-11-14	Bieryla et al. 2015		1.03 ± 0.84
2012-11-03	Bieryla et al. 2015		-1.36 ± 0.71
2012-10-23	Bieryla et al. 2015		-1.83 ± 0.52
2012-10-04	Bieryla et al. 2015		-0.46 ± 1.07

KELT-7b (LOW)

Discovered by: Bieryla et al. 2015

ExoClock Observations

Space Observations

Literature Mid-times