exoclock

Qatar-2b (LOW - SPOTS)

Discovered by: Bryan et al. 2012

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
MagV
13.3		 MagR
13.45		 MagI*
12.034		 MagJ
11.35		 MagH
10.794		 MagK
10.619
MagG
13.028		 MagGBP
13.695		 MagGRP
12.261
*Calculated from GAIA magnitudes.

Ephemeris - Verified True
Kokori et al. 2025
Mid-time
2457153.928453 ± 2.4e-05 BJDTDB
Period
1.337116516 ± 5e-08 days
Transit Parameters
Močnik et al. 2017
Rp/Rs
0.16327 ± 0.00019		 a/Rs**
6.45 +0.05 -0.06
 i
88.99 +0.2 -0.2 deg
e
-		 ω
- deg
DepthR*
37.71 mmag		 Duration*
1.84 hours
*Calculated from the other parameters, using PyLightcurve.
**Adjusted based on the space observations.

Limb Darkening Parameters
Bryan et al. 2012
Teff
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 LOW - SPOTS
Minimum aperture 9.27"
Total Observations (Recent) 93 (5)
O-C 0.34 ± 0.12 minutes
ExoClock Observations (Recent) 52 (5)
Space Observations (Recent) 24 (0)
ETD Observations (Recent) 0 (0)
Literature Mid-times (Recent) 17 (0)
Kepler Rp/Rs 0.162384 ± 6.4e-05
TESS Rp/Rs -

Qatar-2b


ExoClock Observations
Planet
Observation Date		 Observer
Observatory		 Telescope
Camera / Filter / Exp [s]		 O-C
minutes
Qatar-2b (LOW - SPOTS)
2026-06-01		Javier Alonso Santiago
INAF-OACT		Cassegrain 91cm
Moravian C4-1600EC / R / 70.0		0.44 ± 0.66
Qatar-2b (LOW - SPOTS)
2026-04-24		Pieter Vuylsteke
Marvel (La Palma)		ASA Ritchey
ZWO 6200mm / rpr / 180.0		-0.01 ± 0.19
Qatar-2b (LOW - SPOTS)
2026-04-10		Yen-Hsing Lin
Starry House Observatory		Mewlon 300 CRS
ASI 6200MM Pro / Lum / 60.0		0.47 ± 0.71
Qatar-2b (LOW - SPOTS)
2026-04-08		Giovanni Calapai
Calapai Astronomical Observatory		Celestron C14
Atik 314L+ / AstrodonExoPlanet-BB / 90.0		-0.38 ± 0.46
Qatar-2b (LOW - SPOTS)
2026-03-24		Dale Gary
99 Buena Vista		ZWO FF130
ASI2600-MM-DUO / Lum / 60.0		2.61 ± 1.22
Qatar-2b (LOW - SPOTS)
2025-04-07		Francesco Scaggiante
Gruppo Astrofili Salese "GALILEO GALILEI"		NEWTON 410/1710
Player One Astronomy Poseidon-M Pro (IMX571) / rpr / 180.0		0.92 ± 1.73
Qatar-2b (LOW - SPOTS)
2025-04-07		Daniel BOUYSSE
OAA46500		RC TS-Optics f/6.4
ASI2600MC Pro / Lum / 300.0		-1.46 ± 1.22
Qatar-2b (LOW - SPOTS)
2025-04-01		Jean-Pascal Vignes
Deep Sky Chile		Planewave CDK400
QHYCCD 600M / Lum / 90.0		-0.59 ± 0.32
Qatar-2b (LOW - SPOTS)
2025-03-24		Jean-Pascal Vignes
Deep Sky Chile		PlaneWave CDK 17"
QHYCCD 600 M / Lum / 90.0		1.18 ± 0.2
Qatar-2b (LOW - SPOTS)
2024-04-28		Vitória Bellecerie da Fonseca
Observatório do Pico dos Dias		1.6m Perkin-Elmer f/10
SPARC4 - Andor iXon Ultra 888 / ipr / 12.0		0.39 ± 0.16
Qatar-2b (LOW - SPOTS)
2024-04-28		Vitória Bellecerie da Fonseca
Observatório do Pico dos Dias		1.6m Perkin-Elmer f/10
SPARC4 - Andor iXon Ultra 888 / rpr / 8.0		0.1 ± 0.12
Qatar-2b (LOW - SPOTS)
2024-04-28		Vitória Bellecerie da Fonseca
Observatório do Pico dos Dias		1.6m Perkin-Elmer f/10
SPARC4 - Andor iXon Ultra 888 / gpr / 24.0		0.07 ± 0.24
Qatar-2b (LOW - SPOTS)
2024-04-28		Vitória Bellecerie da Fonseca
Observatório do Pico dos Dias		1.6m Perkin-Elmer f/10
SPARC4 - Andor iXon Ultra 888 / zpr / 24.0		-0.17 ± 0.19
Qatar-2b (LOW - SPOTS)
2024-04-19		Riccardo Zancan
Riccardo		Celestron C11
ASI-1600-MM / R / 120.0		1.15 ± 1.58
Qatar-2b (LOW - SPOTS)
2024-04-19		Gerard Tartalo
Dark Energy Observatory		Ts Photoline triplet apo 115/800 F7
Qhy294M pro / rpr / 300.0		1.01 ± 1.73
Qatar-2b (LOW - SPOTS)
2024-04-15		Robert Roth
TURMX Observatory		CFF Telescopes 160mm APO
ZWO ASI6200MM Pro / Lum / 120.0		1.28 ± 0.73
Qatar-2b (LOW - SPOTS)
2024-04-11		Fontaine Bruno
LE JAS		Officina Stellare RILA 400 F5.2
QHYCCD QHY 42 PRO / AstrodonExoPlanet-BB / 100.0		1.15 ± 2.16
Qatar-2b (LOW - SPOTS)
2024-04-09		Nicolás Castro-Morales
El Sauce		Mas500
Moravian / rpr / 30.0		-1.4 ± 2.02
Qatar-2b (LOW - SPOTS)
2024-04-05		Charles Miller
Miller Observatory		Meade 12" LX850
QHY268M / R / 70.0		0.95 ± 0.58
Qatar-2b (LOW - SPOTS)
2024-02-13		Gustavo Muler
Obs. Nazaret J47		lx 200
ST8 XME AO8 / R / 250.0		-0.43 ± 0.6
Qatar-2b (LOW - SPOTS)
2023-04-24		Jean-Claude MARIO
Observatoire de la Cabergue		T 500 Cassegrain "Arp 83"
ASI 6200 MM / Lum / 240.0		-0.06 ± 1.08
Qatar-2b (LOW - SPOTS)
2023-04-16		Anaël Wünsche
Observatoire des Baronnies Provençales		CDK Planewave 2
ZWO ASI6200 / Clear / 120.0		0.44 ± 0.68
Qatar-2b (LOW - SPOTS)
2023-03-29		Magdalena Szkudlarek
Deep Sky Chile - ROTUZ		PlaneWave CDK 20
QHY268M pro / R / 81.0		0.11 ± 0.35
Qatar-2b (LOW - SPOTS)
2023-03-27		Claudio Lopresti
Claudio Lopresti		Mak-Newton
CCD Sbig ST10xme / R / 240.0		3.17 ± 3.31
Qatar-2b (LOW - SPOTS)
2023-03-21		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / Lum / 120.0		-0.54 ± 0.32
Qatar-2b (LOW - SPOTS)
2023-03-21		Jean-Pascal Vignes
Deep Sky Chile		Planewave CDK400
QHYCCD 600M / Lum / 90.0		-2.28 ± 0.59
Qatar-2b (LOW - SPOTS)
2023-03-01		Enrique Arce
Vallbona Observatory		Newton 10" f4
Sbig ST7-XME / Clear / 300.0		-1.71 ± 0.81
Qatar-2b (LOW - SPOTS)
2023-02-25		Miguel Ángel Álava Amat
Sarriguren		Meade SC 8"
Asi 1600 MM / Lum / 240.0		0.65 ± 1.12
Qatar-2b (LOW - SPOTS)
2022-05-23		Richard Yorke
Observatorio del Teide		Dall-Kirkham Astrograph telescope
FLI ProLine KAF-16803 CCD camera / R / 60.0		-0.69 ± 0.43
Qatar-2b (LOW - SPOTS)
2022-05-10		Tobias Gesser
TURMX Observatory		Planewave CDK17
QHY600M / rpr / 120.0		1.11 ± 0.58
Qatar-2b (LOW - SPOTS)
2022-04-24		Adam Popowicz
Otivar dome2		Newton 12" ASA
ASI ZWO 1600MM / R / 240.0		3.41 ± 1.73
Qatar-2b (LOW - SPOTS)
2022-02-25		Paolo Arcangelo Matassa
P:M.P.H.R. Deep Sky (K81)		Ritchey Chretien 40cm-F5.3
CCD ICX453AQ / Lum / 60.0		3.73 ± 2.02
Qatar-2b (LOW - SPOTS)
2022-02-25		Adrian Jones
Private Observatory (I64)		Meade ACF 30cm
QSI 583 / Lum / 200.0		-0.76 ± 1.24
Qatar-2b (LOW - SPOTS)
2022-02-09		Bruno Monteleone
Osservatorio Astronomico La Macchina del Tempo		GSO RC
ASI1600MM / Clear / 120.0		0.02 ± 0.92
Qatar-2b (LOW - SPOTS)
2021-06-12		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / Lum / 120.0		0.36 ± 0.36
Qatar-2b (LOW - SPOTS)
2021-06-08		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / Lum / 120.0		0.76 ± 0.43
Qatar-2b (LOW - SPOTS)
2021-05-10		Vojtěch Školník
Broumov NM Observatory		Meade LX90 ACF
MI C2-7000A / Clear / 90.0		2.85 ± 1.15
Qatar-2b (LOW - SPOTS)
2021-05-06		Stephen Futcher
Hampshire Astronomical Group, Clanfield		Ritchey-Chrétien
Moravian G4-9000 / R / 120.0		0.4 ± 0.33
Qatar-2b (LOW - SPOTS)
2021-04-30		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / Lum / 120.0		0.59 ± 0.43
Qatar-2b (LOW - SPOTS)
2021-04-18		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / Lum / 120.0		0.6 ± 0.33
Qatar-2b (LOW - SPOTS)
2021-02-18		Roger Dymock
MicroObservatory located at Whipple Observatory		Maksutov reflector
KAF 1402ME / Clear / 60.0		-2.04 ± 3.02
Qatar-2b (LOW - SPOTS)
2020-07-14		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / Clear / 120.0		-0.87 ± 0.72
Qatar-2b (LOW - SPOTS)
2020-06-08		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / Clear / 120.0		0.06 ± 0.43
Qatar-2b (LOW - SPOTS)
2020-05-22		Francois Regembal
HRTobs		Astrosib RC360
SBIG STX 16803 / Lum / 60.0		-1.24 ± 1.15
Qatar-2b (LOW - SPOTS)
2020-05-12		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / Clear / 120.0		1.11 ± 1.01
Qatar-2b (LOW - SPOTS)
2020-04-27		Wonseok Kang
Deokheung Optical Astronomy Observatory		NYSC 1m Telescope
PL-16803 (FLI) / R / 120.0		-1.08 ± 0.43
Qatar-2b (LOW - SPOTS)
2020-04-27		Taewoo Kim
Deokheung Optical Astronomy Observatory		NYSC 1m Telescope
FLI PL-16803 or PI SOPHIA-2048B / R / 120.0		-2.45 ± 0.35
Qatar-2b (LOW - SPOTS)
2020-04-24		Nikolaos Paschalis
Nunki Observatory		Officina Stellare RILA 400
SBIG STXL 11002 / R / 60.0		-0.6 ± 1.3
Qatar-2b (LOW - SPOTS)
2020-04-14		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / Clear / 120.0		1.03 ± 0.43
Qatar-2b (LOW - SPOTS)
2020-02-11		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / Clear / 120.0		2.15 ± 0.43
Qatar-2b (LOW - SPOTS)
2019-05-15		Anaël Wünsche
Observatoire des Baronnies Provençales		Astelco
FLIPL230 / V / 120.0		1.36 ± 0.86
Qatar-2b (LOW - SPOTS)
2015-03-26		Anaël Wünsche
Observatoire des Baronnies Provençales		Astelco
FLIPL230 / R / 30.0		2.03 ± 0.58

Space Observations
Planet
Observation Date		 Mission O-C
minutes
Qatar-2b (LOW - SPOTS)
2015-09-26		K20.01 ± 0.12
Qatar-2b (LOW - SPOTS)
2015-09-24		K20.05 ± 0.19
Qatar-2b (LOW - SPOTS)
2015-09-20		K2-0.3 ± 0.17
Qatar-2b (LOW - SPOTS)
2015-09-16		K2-0.09 ± 0.14
Qatar-2b (LOW - SPOTS)
2015-09-14		K20.48 ± 0.19
Qatar-2b (LOW - SPOTS)
2015-09-10		K20.0 ± 0.13
Qatar-2b (LOW - SPOTS)
2015-09-07		K20.17 ± 0.08
Qatar-2b (LOW - SPOTS)
2015-08-29		K20.09 ± 0.24
Qatar-2b (LOW - SPOTS)
2015-08-27		K2-0.03 ± 0.22
Qatar-2b (LOW - SPOTS)
2015-08-26		K20.24 ± 0.23
Qatar-2b (LOW - SPOTS)
2015-08-23		K2-0.08 ± 0.14
Qatar-2b (LOW - SPOTS)
2015-08-22		K20.11 ± 0.13
Qatar-2b (LOW - SPOTS)
2015-08-21		K20.3 ± 0.11
Qatar-2b (LOW - SPOTS)
2015-08-19		K2-0.01 ± 0.09
Qatar-2b (LOW - SPOTS)
2015-08-18		K2-0.11 ± 0.06
Qatar-2b (LOW - SPOTS)
2015-08-17		K20.15 ± 0.23
Qatar-2b (LOW - SPOTS)
2015-08-14		K20.7 ± 0.35
Qatar-2b (LOW - SPOTS)
2015-08-13		K20.04 ± 0.14
Qatar-2b (LOW - SPOTS)
2015-08-11		K2-0.05 ± 0.04
Qatar-2b (LOW - SPOTS)
2015-08-07		K2-0.21 ± 0.12
Qatar-2b (LOW - SPOTS)
2015-07-18		K20.03 ± 0.1
Qatar-2b (LOW - SPOTS)
2015-07-17		K20.02 ± 0.08
Qatar-2b (LOW - SPOTS)
2015-07-15		K2-0.58 ± 0.33
Qatar-2b (LOW - SPOTS)
2015-07-14		K20.04 ± 0.08

Literature Mid-times
Planet
Observation Date		 Reference O-C
minutes
2013-02-16 Mancini et al. 2014 -0.22 ± 0.39
2012-05-09 Mancini et al. 2014 -0.13 ± 0.33
2012-05-09 Mancini et al. 2014 -0.24 ± 0.23
2012-05-09 Mancini et al. 2014 -0.65 ± 0.4
2012-05-09 Mancini et al. 2014 -0.71 ± 0.26
2012-04-21 Mancini et al. 2014 0.25 ± 0.17
2012-04-21 Mancini et al. 2014 0.03 ± 0.14
2012-04-21 Mancini et al. 2014 -0.23 ± 0.22
2012-04-17 Mancini et al. 2014 0.81 ± 0.22
2012-04-17 Mancini et al. 2014 0.07 ± 0.22
2012-04-17 Mancini et al. 2014 0.04 ± 0.17
2012-04-17 Mancini et al. 2014 -0.47 ± 0.14
2012-04-05 Mancini et al. 2014 0.89 ± 0.26
2012-04-05 Mancini et al. 2014 0.39 ± 0.23
2012-04-05 Mancini et al. 2014 0.32 ± 0.32
2012-04-05 Mancini et al. 2014 0.17 ± 0.24
2011-03-03 Mancini et al. 2014 -0.09 ± 0.13
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