ExoClock

The Star
Simbad GAIA 2MASS	HAT-P-54 DR2 3383298227579280640 J06393552+2528571
RA	06:39:35.5182		DEC	+25:28:57.157
Parallax 6.933 mas		P.M. RA -0.073 mas/y		P.M. DEC -33.237 mas/y
Mag_V 13.505	Mag_R^* 12.752	Mag_I^* 12.062	Mag_J 11.145	Mag_H 10.487	Mag_K 10.326
Mag_G 13.017		Mag_{G_BP} 13.797		Mag_{G_RP} 12.181
^* calculated from GAIA magnitudes

Ephemeris - Verified
Kokori et al. 2020
Mid-time 2457811.6454 ± 0.0004 BJD_TDB
Period 3.7998518 ± 1.1e-06 days
Transit Parameters
Bakos et al. 2015
R_p/R_s 0.1572 ± 0.002	a/R_s 14.34 +0.22 -0.22		i 87.04 +0.08 -0.08 deg
R_p/R_s 0.1572 ± 0.002	e -		ω - deg
Depth_R^* 27.05 mmag		Duration^* 1.8 hours
^* calculated from the other parameters, using PyLightcurve
Limb Darkening Parameters
Bakos et al. 2015
T_eff 4390.0 +50.0 -50.0 K	Log(g) 4.67 +0.01 -0.01 cm/s²		Fe/H -0.13 +0.08 -0.08 dex

ExoClock Status
Observing Priority Total Observations (Recent) O-C minutes Total Literature Mid-times		LOW 24 (5) 1.37±0.15 1

ExoClock Observations

Obs. Date	O-C (min)	Observer Observatory	Telescope Camera / Filter / Exp [s]
2020-12-11	2.8 ± 0.7	Yves Jongen Deep Sky Chile	Plane Wave CDK 17" Moravian 4G / Lum / 120.0
2020-11-22	0.9 ± 0.6	Yves Jongen Deep Sky Chile	Plane Wave CDK 17" Moravian 4G / Lum / 120.0
2020-11-07	1.3 ± 0.7	Manfred Raetz privat observatory Herges-Hallenberg	SCT 280 /1790 (Celestron C11 with reducer) Moravian Instruments G2-1600 / Clear / 120.0
2020-10-26	1.8 ± 0.4	Taewoo Kim Deokheung Optical Astronomy Observatory	NYSC 1m Telescope FLI PL-16803 or PI SOPHIA-2048B / R / 120.0
2020-10-19	2.5 ± 0.7	Yves Jongen Rasteau Observatory	Plane Wave CDK 17" SBIG STXL 11002 / Clear / 120.0
2020-03-27	4.0 ± 1.0	John Savage Z42 Rushay Farm Observatory	Celeston 14Edge with focal reducer ATIK One 9.0 / R / 240.0	- Data available
2020-03-27	0.4 ± 1.3	Geoffrey Thurston I67	Celestron C-14 Atik 314L+ / R / 240.0	- Data available
2020-03-27	-0.9 ± 1.6	Danilo Sedita Osservatorio Sedita Castrofilippo	RC GSO 14" Moravian G2-1600 / R / 90.0	- Data available
2020-03-08	-2.8 ± 2.4	Alberto Tomatis Alto-Observatory	RC STL 6303 / Lum / 120.0	- Data available
2020-02-26	0.4 ± 0.6	Wonseok Kang Deokheung Optical Astronomy Observatory	NYSC 1m Telescope FLI PL-16803 or PI SOPHIA-2048B / R / 90.0	- Data available
2020-02-22	1.2 ± 1.0	Vikrant Kumar Agnihotri Cepheid Observatory India	C11-A XLT Schmidt-Cassegrain/F5.12 Atik414ex mono / Astrodon ExoPlanet-BB / 45.0	- Data available
2020-02-18	1.4 ± 0.7	Alessandro Nastasi Galhassin Robotic Telescope (GRT)	Officina Stellare RiLa 400 FLI ProLine 16803 / Lum / 40.0	- Data available
2020-02-18	-1.2 ± 1.0	Yves Jongen Rasteau Observatory	Plane Wave CDK 17" SBIG STXL 11002 / Clear / 120.0
2020-01-30	1.6 ± 1.4	Dim Stouraitis Galilaios	SCT SXVF-H9 Starlight-Xpress / R / 60.0
2020-01-27	5.8 ± 0.9	Yves Jongen Deep Sky Chile	Plane Wave CDK 17" Moravian 4G / Lum / 120.0
2020-01-11	2.0 ± 3.2	Claudio Lopresti Claudio Lopresti	Mak-Newton CCD Sbig ST10xme / Clear / 240.0	- Data available
2019-10-05	4.1 ± 0.7	Yves Jongen Rasteau Observatory	Plane Wave CDK 17" SBIG STXL 11002 / Clear / 120.0
2019-02-22	1.7 ± 0.7	Yves Jongen Rasteau Observatory	Plane Wave CDK 17" SBIG STXL 11002 / Clear / 120.0
2019-02-03	4.0 ± 0.9	Yves Jongen Rasteau Observatory	Plane Wave CDK 17" SBIG STXL 11002 / Clear / 120.0
2019-01-15	1.6 ± 0.9	Yves Jongen Rasteau Observatory	Plane Wave CDK 17" SBIG STXL 11002 / Clear / 120.0
2019-01-15	-2.1 ± 0.4	Anaël Wünsche Observatoire des Baronnies Provençales	Astelco FLIPL230 / Clear / 60.0	- Data available
2019-01-12	2.4 ± 1.0	Yves Jongen Rasteau Observatory	Plane Wave CDK 17" SBIG STXL 11002 / Clear / 120.0
2018-12-27	1.8 ± 0.6	Yves Jongen Rasteau Observatory	Plane Wave CDK 17" SBIG STXL 11002 / Clear / 120.0
2018-12-05	3.7 ± 1.0	Yves Jongen Rasteau Observatory	Plane Wave CDK 17" SBIG STXL 11002 / Clear / 120.0

Literature Mid-times

Mid-time (BJD_TDB)	Uncertainty (days)	Reference	Uploaded by
2456299.30448	0.00024	Bakos et al. 2015	Adrian Jones

HAT-P-54b

Discovered by: Bakos et al. 2015