ExoClock

The Star
Simbad GAIA 2MASS	Qatar 2 DR2 3620030644476623616 J13503740-0648145
RA	13:50:37.4100		DEC	-06:48:14.419
Parallax 5.485 mas		P.M. RA -88.184 mas/y		P.M. DEC -15.29 mas/y
Mag_V 13.3	Mag_R 13.45	Mag_I^* 12.034	Mag_J 11.35	Mag_H 10.794	Mag_K 10.619
Mag_G 13.028		Mag_{G_BP} 13.695		Mag_{G_RP} 12.261
^*Calculated from GAIA magnitudes.

Ephemeris - Verified
Kokori et al. 2021
Mid-time 2457173.98591 ± 3e-05 BJD_TDB
Period 1.33711716 ± 1.2e-07 days
Transit Parameters
Močnik et al. 2017
R_p/R_s 0.16327 ± 0.00019	a/R_s^** 6.45 +0.05 -0.06		i 88.99 +0.2 -0.2 deg
R_p/R_s 0.16327 ± 0.00019	e -		ω - deg
Depth_R^* 37.71 mmag		Duration^* 1.84 hours
^Calculated from the other parameters, using PyLightcurve. ^*Adjusted to produce a duration that matches the observations.
Limb Darkening Parameters
Bryan et al. 2012
T_eff 4645.0 +50.0 -50.0 K	Log(g) 4.6 +0.02 -0.02 cm/s²		Fe/H 0.02 +0.08 -0.08 dex

ExoClock Status
Observing Priority ExoClock Observations (Recent) Space Observations Literature Mid-times ETD Observations O-C minutes		LOW 26 (8) 17 -2.22±0.1

ExoClock Observations

Observation Date	Observer Observatory	Telescope Camera / Filter / Exp [s]	O-C minutes
2022-05-23	Richard Yorke Observatorio del Teide	Dall-Kirkham Astrograph telescope FLI ProLine KAF-16803 CCD camera / R / 60.0	-3.5 ± 0.4
2022-05-10	Tobias Gesser TURMX Observatory	Planewave CDK17 QHY600M / r' / 120.0	-1.7 ± 0.6
2022-04-24	Adam Popowicz Otivar dome2	Newton 12" ASA ASI ZWO 1600MM / R / 240.0	0.6 ± 1.7
2022-03-11	Chiahui Wang NTNU ES Observatory	RCOS 16" f/8.4 Ritchey-Chretien Atik One 6 / V / 90.0	-0.3 ± 2.0
2022-02-25	Paolo Arcangelo Matassa P:M.P.H.R. Deep Sky (K81)	Ritchey Chretien 40cm-F5.3 CCD ICX453AQ / Lum / 60.0	0.4 ± 2.0
2022-02-25	Adrian Jones Private Observatory (I64)	Meade ACF 30cm QSI 583 / Lum / 200.0	-3.5 ± 1.3
2022-02-09	Bruno Monteleone Osservatorio Astronomico La Macchina del Tempo	GSO RC ASI1600MM / Clear / 120.0	-2.7 ± 1.0
2021-06-12	Yves Jongen Deep Sky Chile	Plane Wave CDK 17" Moravian 4G / Lum / 120.0	-2.2 ± 0.4
2021-06-08	Yves Jongen Deep Sky Chile	Plane Wave CDK 17" Moravian 4G / Lum / 120.0	-1.8 ± 0.4
2021-05-10	Vojtěch Školník Broumov NM Observatory	Meade LX90 ACF MI C2-7000A / Clear / 90.0	0.3 ± 1.2
2021-05-06	Stephen Futcher Hampshire Astronomical Group, Clanfield	Ritchey-Chrétien Moravian G4-9000 / R / 120.0	-2.1 ± 0.3
2021-04-30	Yves Jongen Deep Sky Chile	Plane Wave CDK 17" Moravian 4G / Lum / 120.0	-1.9 ± 0.4
2021-04-18	Yves Jongen Deep Sky Chile	Plane Wave CDK 17" Moravian 4G / Lum / 120.0	-1.9 ± 0.3
2021-02-18	Andre Kovacs MicroObservatory Cecillia	152mm Maksutov Kodak KAF-1402ME / Clear / 60.0	-3.2 ± 3.0
2021-02-18	Roger Dymock MicroObservatory located at Whipple Observatory	Maksutov reflector KAF 1402ME / Clear / 60.0	-4.5 ± 3.0
2020-07-14	Yves Jongen Deep Sky Chile	Plane Wave CDK 17" Moravian 4G / Clear / 120.0	-3.2 ± 0.7	- Data available
2020-06-08	Yves Jongen Deep Sky Chile	Plane Wave CDK 17" Moravian 4G / Clear / 120.0	-2.2 ± 0.4	- Data available
2020-05-22	Francois Regembal HRTobs	Astrosib RC360 SBIG STX 16803 / Lum / 60.0	-3.5 ± 1.2	- Data available
2020-05-12	Yves Jongen Deep Sky Chile	Plane Wave CDK 17" Moravian 4G / Clear / 120.0	-1.2 ± 1.0	- Data available
2020-04-27	Wonseok Kang Deokheung Optical Astronomy Observatory	NYSC 1m Telescope (1) PL-16803 (FLI) / R / 120.0	-3.3 ± 0.4	- Data available
2020-04-27	Taewoo Kim Deokheung Optical Astronomy Observatory	NYSC 1m Telescope FLI PL-16803 or PI SOPHIA-2048B / R / 120.0	-4.7 ± 0.3	- Data available
2020-04-24	Nikolaos Paschalis Nunki Observatory	Officina Stellare RILA 400 SBIG STXL 11002 / R / 60.0	-2.9 ± 1.3	- Data available
2020-04-14	Yves Jongen Deep Sky Chile	Plane Wave CDK 17" Moravian 4G / Clear / 120.0	-1.2 ± 0.4	- Data available
2020-02-11	Yves Jongen Deep Sky Chile	Plane Wave CDK 17" Moravian 4G / Clear / 120.0	-0.1 ± 0.4	- Data available
2019-05-15	Anaël Wünsche Observatoire des Baronnies Provençales	Astelco FLIPL230 / V / 120.0	-0.7 ± 0.9	- Data available
2015-03-26	Anaël Wünsche Observatoire des Baronnies Provençales	Astelco FLIPL230 / R / 30.0	1.1 ± 0.6	- Data available

Literature Mid-times

Observation Date	Mid-time	Time format	Reference	O-C minutes
2013-02-16	2456339.62434 ± 0.00027	BJD_TDB	Mancini et al. 2014	-0.7 ± 0.4
2012-05-09	2456057.49282 ± 0.00023	BJD_TDB	Mancini et al. 2014	-0.4 ± 0.3
2012-05-09	2456057.49274 ± 0.00016	BJD_TDB	Mancini et al. 2014	-0.5 ± 0.2
2012-05-09	2456057.49246 ± 0.00028	BJD_TDB	Mancini et al. 2014	-0.9 ± 0.4
2012-05-09	2456057.49242 ± 0.00018	BJD_TDB	Mancini et al. 2014	-1.0 ± 0.3
2012-04-21	2456038.77345 ± 0.00012	BJD_TDB	Mancini et al. 2014	0.0 ± 0.2
2012-04-21	2456038.77329 ± 0.0001	BJD_TDB	Mancini et al. 2014	-0.2 ± 0.1
2012-04-21	2456038.77312 ± 0.00015	BJD_TDB	Mancini et al. 2014	-0.5 ± 0.2
2012-04-17	2456034.76249 ± 0.00015	BJD_TDB	Mancini et al. 2014	0.6 ± 0.2
2012-04-17	2456034.76198 ± 0.00015	BJD_TDB	Mancini et al. 2014	-0.2 ± 0.2
2012-04-17	2456034.76196 ± 0.00012	BJD_TDB	Mancini et al. 2014	-0.2 ± 0.2
2012-04-17	2456034.76157 ± 0.0001	BJD_TDB	Mancini et al. 2014	-0.7 ± 0.1
2012-04-05	2456022.7285 ± 0.00018	BJD_TDB	Mancini et al. 2014	0.7 ± 0.3
2012-04-05	2456022.72815 ± 0.00016	BJD_TDB	Mancini et al. 2014	0.2 ± 0.2
2012-04-05	2456022.7281 ± 0.00022	BJD_TDB	Mancini et al. 2014	0.1 ± 0.3
2012-04-05	2456022.728 ± 0.00017	BJD_TDB	Mancini et al. 2014	-0.1 ± 0.2
2011-03-03	2455624.267096 ± 8.7e-05	BJD_TDB	Mancini et al. 2014	-0.0 ± 0.1

Qatar-2b

Discovered by: Bryan et al. 2012

ExoClock Observations

Literature Mid-times