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 Minimum aperture Total Observations (Recent) O-C ExoClock Observations (Recent) Space Observations (Recent) ETD Observations (Recent) Literature Mid-times (Recent) Kepler R_p/R_s TESS R_p/R_s		LOW 5.0" 52 (22) 0.001 ± 0.061 minutes 8 (3) 31 (19) 0 (0) 13 (0) - 0.08946 ± 7.4e-05

Observation Date	Observer Observatory	Telescope Camera / Filter / Exp [s]	O-C minutes
ExoClock Observations
2022-02-01	Paolo Arcangelo Matassa P:M.P.H.R. Deep Sky (K81)	Ritchey Chretien 40cm-F5.3 CCD ICX453AQ / Lum / 30.0	2.28 ± 1.87
2022-01-10	Dominique DANIEL La Montjoie	Celestron CGX C8 XLT Camera CMOS ZWO ASI294MC pro (color) / Clear / 60.0	2.03 ± 2.74
2021-11-09	Tõnis Eenmäe Tartu Observatory	Planewave CDK 12.5 Apogee Alta U42 / B / 20.0	1.9 ± 1.58
2020-12-15	Martin Crow Burnham Observatory	Celestron C9.25 SX694 mono / R / 4.0	6.18 ± 5.76
2020-11-24	Anaël Wünsche Observatoire des Baronnies Provençales	CDK Planewave SBIG STL11K / R / 30.0	0.45 ± 0.86
2020-11-13	Alessandro Nastasi Galhassin Robotic Telescope 1 (GRT1)	Officina Stellare RiLa 400 FLI ProLine 16803 / z' / 30.0	2.27 ± 1.44
2019-12-31	Claudio Lopresti Claudio Lopresti	Mak-Newton CCD Sbig ST10xme / I / 240.0	0.12 ± 1.44
2019-01-15	Giuseppe Conzo Gruppo Astrofili Palidoro	Skywatcher 80ED ASI-178MM / Clear / 90.0	4.01 ± 1.3
Literature Mid-times
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
Space Observations
Observation Date	Mission		O-C minutes
2021-11-30	TESS		0.23 ± 0.33
2021-11-28	TESS		-0.47 ± 0.3
2021-11-25	TESS		0.25 ± 0.33
2021-11-22	TESS		0.27 ± 0.29
2021-11-17	TESS		0.36 ± 0.29
2021-11-14	TESS		-0.19 ± 0.29
2021-11-11	TESS		-0.07 ± 0.29
2021-11-09	TESS		0.2 ± 0.29
2021-10-31	TESS		-0.59 ± 0.29
2021-10-29	TESS		-0.78 ± 0.35
2021-10-26	TESS		-0.11 ± 0.29
2021-10-23	TESS		-0.45 ± 0.29
2021-10-20	TESS		-0.04 ± 0.27
2021-10-18	TESS		0.09 ± 0.29
2021-10-15	TESS		-0.09 ± 0.27
2021-10-09	TESS		-0.06 ± 0.27
2021-10-07	TESS		-0.1 ± 0.3
2021-10-04	TESS		0.34 ± 0.29
2021-10-01	TESS		0.8 ± 0.3
2021-09-26	TESS		0.21 ± 0.29
2021-09-23	TESS		0.07 ± 0.29
2021-09-20	TESS		0.11 ± 0.29
2021-09-18	TESS		-0.37 ± 0.3
2019-12-20	TESS		-0.0 ± 0.35
2019-12-18	TESS		0.12 ± 0.4
2019-12-15	TESS		-0.59 ± 0.32
2019-12-12	TESS		-0.2 ± 0.37
2019-12-09	TESS		-0.25 ± 0.3
2019-12-07	TESS		0.43 ± 0.27
2019-12-04	TESS		-0.13 ± 0.3
2019-12-01	TESS		0.37 ± 0.32

KELT-7b (LOW)

Discovered by: Bieryla et al. 2015

ExoClock Observations

Literature Mid-times

Space Observations