exoclock

Qatar-3b (LOW)

Discovered by: Alsubai et al. 2017

The Star
Simbad
GAIA
2MASS		 Qatar 3
DR2 2878641361300809856
J23563647+3612466
RA 23:56:36.4831 DEC +36:12:46.773
Parallax
1.332 mas		 P.M. RA
-7.763 mas/y		 P.M. DEC
-8.484 mas/y
MagV
12.88		 MagR
12.89		 MagI*
12.112		 MagJ
11.601		 MagH
11.272		 MagK
11.219
MagG
12.82		 MagGBP
13.122		 MagGRP
12.233
*Calculated from GAIA magnitudes.

Ephemeris - Verified True
Kokori et al. 2025
Mid-time
2457565.78263 ± 0.00015 BJDTDB
Period
2.50790151 ± 4.8e-07 days
Transit Parameters
Alsubai et al. 2017
Rp/Rs
0.0888 ± 0.0018		 a/Rs
6.4 +0.6 -0.6
 i
86.8 +2.0 -2.0 deg
e
-		 ω
- deg
DepthR*
10.12 mmag		 Duration*
3.1 hours
*Calculated from the other parameters, using PyLightcurve.
**Adjusted based on the space observations.

Limb Darkening Parameters
Alsubai et al. 2017
Teff
6007.0 +52.0 -52.0 K
 Log(g)
4.29 +0.08 -0.08 cm/s2
 Fe/H
-0.04 +0.08 -0.08 dex
ExoClock Status
Observing Priority LOW
Minimum aperture 9.58"
Total Observations (Recent) 40 (6)
O-C 3.18 ± 0.68 minutes
ExoClock Observations (Recent) 30 (6)
Space Observations (Recent) 9 (0)
ETD Observations (Recent) 0 (0)
Literature Mid-times (Recent) 1 (0)
Kepler Rp/Rs -
TESS Rp/Rs 0.0838 ± 0.0018

Qatar-3b


ExoClock Observations
Planet
Observation Date		 Observer
Observatory		 Telescope
Camera / Filter / Exp [s]		 O-C
minutes
Qatar-3b (LOW)
2025-10-02		Pieter Vuylsteke
Marvel (La Palma)		ASA Ritchey
ZWO 6200mm / rpr / 120.0		7.17 ± 0.99
Qatar-3b (LOW)
2025-10-02		Arushi Nath
Arushi Nath		12" Ritchey- Chretien Pro
ASI 2600 Mono Camera / R / 180.0		2.49 ± 2.74
Qatar-3b (LOW)
2025-09-22		Mark Salisbury
POST		Orion Optics ODK
SBIG ST-10 XME / R / 240.0		4.81 ± 1.87
Qatar-3b (LOW)
2025-09-22		Simon Dawes
William James II		Celestron Edge11 HD
Risingcam Monochrome SONY imx571 / Lum / 300.0		-2.25 ± 5.9
Qatar-3b (LOW)
2025-09-17		Lionel Rousselot
Private observatory Vierzon		Newton 250/740
ZWO 533 monochrome / Lum / 120.0		-1.38 ± 2.3
Qatar-3b (LOW)
2025-09-17		Christian Sartini
Chris31		C9 xlt Celestron
ASI 294MM PRO / R / 180.0		-8.01 ± 4.61
Qatar-3b (LOW)
2024-11-15		Davide Pica
Private Observatory		Celestron C9.25
QHY 294 M Pro / V / 75.0		0.76 ± 5.33
Qatar-3b (LOW)
2024-10-31		Snaevarr Guðmundsson
Ness Observatory		Meade LX 200 ACF Schmidt-Cassegrain
SBIG STL 11000M / AstrodonExoPlanet-BB / 120.0		-3.84 ± 1.58
Qatar-3b (LOW)
2023-12-15		Jordi González-Edo
Landete-Kea		Celestron C11
sony a7s modified / Lum / 60.0		5.51 ± 3.6
Qatar-3b (LOW)
2023-09-09		jean paul vergne
CH9-gapra		Ritchey Chretien
zwo 294mm pro / Lum / 180.0		-3.62 ± 2.74
Qatar-3b (LOW)
2023-09-04		Simon Dawes
William James II		Celestron Edge11 HD
Risingcam Monochrome SONY imx571 / Lum / 300.0		2.72 ± 3.31
Qatar-3b (LOW)
2023-09-04		Martin Crow
Burnham Observatory		Celestron C9.25
SX694 mono / Clear / 200.0		0.56 ± 2.88
Qatar-3b (LOW)
2023-08-20		Adrian Jones
Private Observatory (I64)		Meade ACF 30cm
QSI 583 / Lum / 200.0		1.15 ± 2.45
Qatar-3b (LOW)
2023-08-20		Martin Crow
Burnham Observatory		Celestron C9.25
SX694 mono / R / 200.0		0.86 ± 3.17
Qatar-3b (LOW)
2023-08-20		Kevin Johnson
Holbrook Observatory		Meade LX50 10"
Atik 383L+ / Lum / 180.0		-1.3 ± 2.88
Qatar-3b (LOW)
2023-08-20		jean paul vergne
CH9-gapra		Ritchey Chretien
zwo 294mm pro / Lum / 180.0		-2.16 ± 3.02
Qatar-3b (LOW)
2023-08-14		Anaël Wünsche
Observatoire des Baronnies Provençales		CDK Planewave 2
ZWO ASI6200 / Clear / 120.0		5.86 ± 1.04
Qatar-3b (LOW)
2023-08-14		jean paul vergne
CH9-gapra		Ritchey Chretien
zwo 294mm pro / Lum / 180.0		-3.31 ± 3.6
Qatar-3b (LOW)
2023-01-13		Adrian Jones
Private Observatory (I64)		Meade ACF 30cm
QSI 583 / Lum / 150.0		-0.82 ± 2.59
Qatar-3b (LOW)
2022-09-27		Adrian Jones
Private Observatory (I64)		Meade ACF 30cm
QSI 583 / R / 200.0		-2.74 ± 2.16
Qatar-3b (LOW)
2022-09-22		David Arnot
OSO PIRATE		PlaneWave Instruments CDK24 24 inch (610 mm) f/6.5 Corrected Dall-Kirkham Astrograph
FLI ProLine KAF-16803 / R / 65.0		3.6 ± 2.16
Qatar-3b (LOW)
2022-09-22		Manfred Raetz
privat observatory Herges-Hallenberg		SCT 280 /1790 (Celestron C11 with reducer)
Moravian Instruments G2-1600 / AstrodonExoPlanet-BB / 120.0		-4.32 ± 1.73
Qatar-3b (LOW)
2022-08-28		Dim Stouraitis
Galilaios		SCT
SXVF-H9 Starlight-Xpress / R / 120.0		2.9 ± 3.46
Qatar-3b (LOW)
2022-07-09		Wen-Hsin Chen
NTHUOBS		Showa 10"
ASI6200MM / Lum / 300.0		0.49 ± 3.02
Qatar-3b (LOW)
2021-10-21		Adrian Jones
Private Observatory (I64)		Meade ACF 30cm
QSI 583 / R / 200.0		-2.88 ± 2.88
Qatar-3b (LOW)
2021-10-16		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / Lum / 120.0		0.44 ± 1.44
Qatar-3b (LOW)
2021-09-21		Dim Stouraitis
Galilaios		SCT
SXVF-H9 Starlight-Xpress / R / 120.0		-0.69 ± 7.2
Qatar-3b (LOW)
2020-11-09		Manfred Raetz
privat observatory Herges-Hallenberg		SCT 280 /1790 (Celestron C11 with reducer)
Moravian Instruments G2-1600 / Clear / 120.0		-3.3 ± 1.01
Qatar-3b (LOW)
2017-07-30		Mario Morales-Aimar
Observatorio de Sencelles MPC K14		10" Meade Schmidt Cassegrain
SBIG ST7-XME / V / 120.0		-4.42 ± 1.87
Qatar-3b (LOW)
2016-12-23		Anaël Wünsche
Observatoire des Baronnies Provençales		CDK Planewave
SBIG STL11K / Clear / 120.0		2.39 ± 2.3

Space Observations
Planet
Observation Date		 Mission O-C
minutes
Qatar-3b (LOW)
2022-10-28		TESS-3.35 ± 2.45
Qatar-3b (LOW)
2022-10-25		TESS-2.34 ± 3.89
Qatar-3b (LOW)
2022-10-23		TESS2.71 ± 3.02
Qatar-3b (LOW)
2022-10-20		TESS-3.2 ± 2.59
Qatar-3b (LOW)
2022-10-18		TESS-0.75 ± 5.47
Qatar-3b (LOW)
2022-10-15		TESS-0.31 ± 2.74
Qatar-3b (LOW)
2022-10-10		TESS-5.92 ± 3.46
Qatar-3b (LOW)
2022-10-05		TESS-4.48 ± 3.02
Qatar-3b (LOW)
2022-10-02		TESS-1.6 ± 2.88

Literature Mid-times
Planet
Observation Date		 Reference O-C
minutes
2015-10-06 Alsubai et al. 2017 0.04 ± 0.14
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