ExoClock

The Star
Simbad GAIA 2MASS	HAT-P-28 DR2 363702817083391232 J00520018+3443422
RA	00:52:00.1877		DEC	+34:43:42.203
Parallax 2.463 mas		P.M. RA 25.519 mas/y		P.M. DEC 2.859 mas/y
Mag_V 13.03	Mag_R 13.24	Mag_I^* 12.142	Mag_J 11.561	Mag_H 11.206	Mag_K 11.104
Mag_G 12.872		Mag_{G_BP} 13.3		Mag_{G_RP} 12.275
^*Calculated from GAIA magnitudes.

Ephemeris - Verified
Kokori et al. 2022
Mid-time 2458134.11472 ± 0.0003 BJD_TDB
Period 3.25721296 ± 8e-07 days
Transit Parameters
Buchhave et al. 2011
R_p/R_s 0.113 ± 0.0024	a/R_s 8.4 +0.6 -0.6		i 88.0 +0.9 -0.9 deg
R_p/R_s 0.113 ± 0.0024	e 0.05 +0.03 -0.03		ω 233.0 +90.0 -90.0 deg
Depth_R^* 16.75 mmag		Duration^* 3.31 hours
^Calculated from the other parameters, using PyLightcurve. ^*Adjusted based on the space observations.
Limb Darkening Parameters
Buchhave et al. 2011
T_eff 5680.0 +90.0 -90.0 K	Log(g) 4.36 +0.06 -0.06 cm/s²		Fe/H 0.12 +0.08 -0.08 dex

ExoClock Status
Observing Priority		LOW
Minimum aperture		8.59"
Total Observations (Recent)		18 (3)
O-C		0.38 ± 0.84 minutes
ExoClock Observations (Recent)		17 (3)
Space Observations (Recent)		0 (0)
ETD Observations (Recent)		0 (0)
Literature Mid-times (Recent)		1 (0)
Kepler R_p/R_s		-
TESS R_p/R_s		-

Planet Observation Date	Observer Observatory	Telescope Camera / Filter / Exp [s]	O-C minutes
ExoClock Observations
HAT-P-28b (LOW) 2022-12-08	Adrian Jones Private Observatory (I64)	Meade ACF 30cm QSI 583 / R / 200.0	-0.94 ± 1.41
HAT-P-28b (LOW) 2022-10-07	Marco Bastoni Bellatrix	GSO RC 10'' Moravian G3-16200 / Lum / 300.0	-0.99 ± 4.32
HAT-P-28b (LOW) 2022-07-25	Yves Jongen Rasteau Observatory	Plane Wave CDK 17" SBIG STXL 11002 / Lum / 180.0	1.17 ± 1.3
HAT-P-28b (LOW) 2022-01-13	Adrian Jones Private Observatory (I64)	Meade ACF 30cm QSI 583 / R / 150.0	2.7 ± 2.59
HAT-P-28b (LOW) 2022-01-13	Paolo Arcangelo Matassa P:M.P.H.R. Deep Sky (K81)	Ritchey Chretien 40cm-F5.3 CCD ICX453AQ / Lum / 120.0	-1.62 ± 4.32
HAT-P-28b (LOW) 2021-10-17	Adrian Jones Private Observatory (I64)	Meade ACF 30cm QSI 583 / R / 200.0	0.9 ± 4.32
HAT-P-28b (LOW) 2020-11-13	Mike Miller Georgetown Observatory	Meade 10 inch ACF f8 f5.6 QSI 540 / V / 120.0	2.55 ± 5.76
HAT-P-28b (LOW) 2020-09-22	Manfred Raetz privat observatory Herges-Hallenberg	SCT 280 /1790 (Celestron C11 with reducer) Moravian Instruments G2-1600 / Clear / 120.0	-2.62 ± 1.15
HAT-P-28b (LOW) 2020-09-09	Manfred Raetz privat observatory Herges-Hallenberg	SCT 280 /1790 (Celestron C11 with reducer) Moravian Instruments G2-1600 / Clear / 120.0	2.2 ± 0.86
HAT-P-28b (LOW) 2020-08-26	Dim Stouraitis Galilaios	SCT SXVF-H9 Starlight-Xpress / R / 70.0	0.12 ± 1.73
HAT-P-28b (LOW) 2019-12-03	Anaël Wünsche Observatoire des Baronnies Provençales	Astelco FLIPL230 / Clear / 60.0	-2.81 ± 0.86
HAT-P-28b (LOW) 2019-10-25	Nikolaos Paschalis Nunki Observatory	Officina Stellare RILA 400 SBIG STXL 11002 / R / 60.0	0.43 ± 3.17
HAT-P-28b (LOW) 2019-10-02	Yves Jongen Rasteau Observatory	Plane Wave CDK 17" SBIG STXL 11002 / Clear / 120.0	1.57 ± 1.58
HAT-P-28b (LOW) 2018-12-26	Yves Jongen Rasteau Observatory	Plane Wave CDK 17" SBIG STXL 11002 / Clear / 120.0	1.3 ± 1.44
HAT-P-28b (LOW) 2018-10-12	Anaël Wünsche Observatoire des Baronnies Provençales	Astelco FLIPL230 / Clear / 60.0	0.58 ± 0.58
HAT-P-28b (LOW) 2018-09-29	Marc Deldem Les Barres Observatory	Celestron C8 SBIG ST8-XME / Clear / 120.0	0.94 ± 3.17
HAT-P-28b (LOW) 2017-11-17	Anaël Wünsche Observatoire des Baronnies Provençales	Astelco FLIPL230 / Lum / 120.0	-0.56 ± 1.15
Literature Mid-times
Planet Observation Date	Reference		O-C minutes
2010-08-09	Buchhave et al. 2011		-0.03 ± 0.76

HAT-P-28b (LOW)

Discovered by: Buchhave et al. 2011

ExoClock Observations

Literature Mid-times