ExoClock

The Star
Simbad GAIA 2MASS	Qatar 4 DR2 385697172809355392 J00192622+4401395
RA	00:19:26.2245		DEC	+44:01:39.484
Parallax 3.011 mas		P.M. RA 0.985 mas/y		P.M. DEC -8.866 mas/y
Mag_V 13.6	Mag_R 13.68	Mag_I^* 12.636	Mag_J 12.03	Mag_H 11.631	Mag_K 11.519
Mag_G 13.411		Mag_{G_BP} 13.892		Mag_{G_RP} 12.783
^* calculated from GAIA magnitudes

Ephemeris - Verified
Kokori et al. 2020
Mid-time 2458293.1227 ± 0.00015 BJD_TDB
Period 1.805369 ± 6e-07 days
Transit Parameters
Alsubai et al. 2017
R_p/R_s 0.138 ± 0.003	a/R_s 7.1 +0.5 -0.5		i 87.5 +1.6 -1.6 deg
R_p/R_s 0.138 ± 0.003	e -		ω - deg
Depth_R^* 25.42 mmag		Duration^* 2.14 hours
^* calculated from the other parameters, using PyLightcurve
Limb Darkening Parameters
Alsubai et al. 2017
T_eff 5215.0 +50.0 -50.0 K	Log(g) 4.53 +0.06 -0.06 cm/s²		Fe/H 0.1 +0.08 -0.08 dex

ExoClock Status
Observing Priority Total Observations (Recent) O-C minutes Total Literature Mid-times		LOW 30 (2) -2.32±0.15 1

ExoClock Observations

Observation Date	Observer Observatory	Telescope Camera / Filter / Exp [s]	O-C minutes
2021-08-31	Kevin Hills Tacande	ASA 0.5m f/3.6 astrograph. QHY 600M with IMX 455 chip / R / 90.0	-5.6 ± 0.9
2021-07-16	Dim Stouraitis Galilaios	SCT SXVF-H9 Starlight-Xpress / R / 90.0	-4.0 ± 1.6
2020-12-24	John Savage Z42 Rushay Farm Observatory	Celestron 14Edge ZWO ASI6200MM / R / 180.0	-2.1 ± 1.3
2020-11-18	Yves Jongen Rasteau Observatory	Plane Wave CDK 17" SBIG STXL 11002 / Lum / 120.0	-4.9 ± 0.9
2020-11-07	Lorenzo Betti Osservatorio Polifunzionale del Chianti	Ritchey-Chretien Moravian G4 - KAF 09000 / V / 90.0	-5.5 ± 0.6
2020-11-02	Taewoo Kim Deokheung Optical Astronomy Observatory	NYSC 1m Telescope FLI PL-16803 or PI SOPHIA-2048B / R / 120.0	-5.6 ± 0.6
2020-09-12	Manfred Raetz privat observatory Herges-Hallenberg	SCT 280 /1790 (Celestron C11 with reducer) Moravian Instruments G2-1600 / Clear / 120.0	-3.8 ± 1.0
2020-08-25	Anaël Wünsche Observatoire des Baronnies Provençales	Astelco2 ZWO ASI6200 / Clear / 120.0	-2.5 ± 0.4
2020-08-25	Alberto Tomatis Alto-Observatory	RC STL 6303 / Lum / 240.0	-3.7 ± 0.7
2020-08-25	Vojtěch Školník Hvezdarna Valasske Mezirici	Meade LX90 ACF Meade DSI II / Clear / 180.0	-3.8 ± 1.0
2020-08-25	Yves Jongen Rasteau Observatory	Plane Wave CDK 17" SBIG STXL 11002 / Clear / 120.0	-4.0 ± 0.9
2020-07-27	Francois Regembal HRTobs	Astrosib RC360 SBIG STX 16803 / Lum / 60.0	-3.8 ± 1.3
2020-07-09	Yves Jongen Rasteau Observatory	Plane Wave CDK 17" SBIG STXL 11002 / Clear / 120.0	-0.1 ± 1.2
2020-07-09	Marc Bretton Observatoire des Baronnies Provençales	Astelco 800mm ZWO ASI6200 / Clear / 120.0	-3.8 ± 0.7
2020-01-07	Yves Jongen Rasteau Observatory	Plane Wave CDK 17" SBIG STXL 11002 / Clear / 120.0	-3.1 ± 1.9
2019-11-21	Ferran Grau Horta Ca L'Ou	Meade ACF 16'' FLI Proline PL1001 / Clear / 300.0	-2.8 ± 1.7
2019-11-12	Yves Jongen Rasteau Observatory	Plane Wave CDK 17" SBIG STXL 11002 / Clear / 120.0	-2.7 ± 1.4
2019-10-16	Mario Morales Aimar Observatorio de Sencelles MPC K14	10" Meade Schmidt Cassegrain SBIG ST7-XME / Clear / 500.0	1.1 ± 1.3
2019-10-07	Yves Jongen Rasteau Observatory	Plane Wave CDK 17" SBIG STXL 11002 / Clear / 120.0	-2.6 ± 1.2
2019-10-05	Anaël Wünsche Observatoire des Baronnies Provençales	Astelco FLIPL230 / Clear / 120.0	-0.1 ± 0.4	- Data available
2019-10-05	Yves Jongen Rasteau Observatory	Plane Wave CDK 17" SBIG STXL 11002 / Clear / 120.0	-2.6 ± 0.7
2019-09-17	Yves Jongen Rasteau Observatory	Plane Wave CDK 17" SBIG STXL 11002 / Clear / 120.0	-4.2 ± 1.2
2019-08-21	Dim Stouraitis Galilaios	SCT SXVF-H9 Starlight-Xpress / R / 60.0	-3.0 ± 1.3
2019-07-23	Yves Jongen Rasteau Observatory	Plane Wave CDK 17" SBIG STXL 11002 / Clear / 120.0	-1.2 ± 0.9
2019-01-20	Yves Jongen Rasteau Observatory	Plane Wave CDK 17" SBIG STXL 11002 / Clear / 120.0	-1.8 ± 1.2
2019-01-02	Yves Jongen Rasteau Observatory	Plane Wave CDK 17" SBIG STXL 11002 / Clear / 120.0	0.9 ± 1.6
2018-12-24	Yves Jongen Rasteau Observatory	Plane Wave CDK 17" SBIG STXL 11002 / Clear / 120.0	1.1 ± 0.9
2018-01-24	Anaël Wünsche Observatoire des Baronnies Provençales	Astelco FLIPL230 / Lum / 120.0	0.2 ± 0.4	- Data available
2017-09-05	Marc Deldem Les Barres Observatory	Celestron C8 SBIG ST8-XME / Clear / 150.0	-1.7 ± 1.7	- Data available
2016-12-30	Claudio Lopresti Claudio Lopresti	Makutov-Cassegrain CCD Sbig ST8xme / R / 240.0	1.5 ± 2.0	- Data available

Literature Mid-times

Observation Date	Mid-time	Time format	Reference	O-C minutes
2016-09-06	2457637.77361 ± 0.00046	BJD_TDB	Alsubai et al. 2017	-0.2 ± 0.7

Discovered by: Alsubai et al. 2017