exoclock

Qatar-5b (LOW)

Discovered by: Alsubai et al. 2017

The Star
Simbad
GAIA
2MASS		 Qatar 5
DR2 382111248777193216
J00281293+4203407
RA 00:28:12.9437 DEC +42:03:40.943
Parallax
2.693 mas		 P.M. RA
0.919 mas/y		 P.M. DEC
-6.509 mas/y
MagV
12.82		 MagR
12.86		 MagI*
12.018		 MagJ
11.348		 MagH
11.089		 MagK
10.956
MagG
12.524		 MagGBP
12.915		 MagGRP
11.987
*Calculated from GAIA magnitudes.

Ephemeris - Verified True
Kokori et al. 2025
Mid-time
2457941.41097 ± 0.00014 BJDTDB
Period
2.87929808 ± 3.9e-07 days
Transit Parameters
Alsubai et al. 2017
Rp/Rs
0.1061 ± 0.0013		 a/Rs
8.3 +0.3 -0.3
 i
88.7 +0.9 -0.9 deg
e
-		 ω
- deg
DepthR*
14.94 mmag		 Duration*
2.9 hours
*Calculated from the other parameters, using PyLightcurve.
**Adjusted based on the space observations.

Limb Darkening Parameters
Alsubai et al. 2017
Teff
5747.0 +49.0 -49.0 K
 Log(g)
4.43 +0.04 -0.04 cm/s2
 Fe/H
0.38 +0.08 -0.08 dex
ExoClock Status
Observing Priority LOW
Minimum aperture 7.53"
Total Observations (Recent) 66 (9)
O-C -2.86 ± 0.37 minutes
ExoClock Observations (Recent) 49 (9)
Space Observations (Recent) 14 (0)
ETD Observations (Recent) 0 (0)
Literature Mid-times (Recent) 3 (0)
Kepler Rp/Rs -
TESS Rp/Rs 0.10166 ± 0.00075

Qatar-5b


ExoClock Observations
Planet
Observation Date		 Observer
Observatory		 Telescope
Camera / Filter / Exp [s]		 O-C
minutes
Qatar-5b (LOW)
2025-10-19		David Molina
Anunak iObservatory		S/C
KAF 8300 / Clear / 180.0		-6.99 ± 2.45
Qatar-5b (LOW)
2025-09-28		John Savage
Rushay Farm Z42		Skywatcher Esprit 150
ZWO ASI 6200MM / Lum / 120.0		-3.12 ± 1.58
Qatar-5b (LOW)
2025-09-26		samuel Diaz Lopez
Tomas Lopez (AstroCamp)		SCA260
ASI2600MM / rpr / 180.0		1.49 ± 1.58
Qatar-5b (LOW)
2025-08-10		Christian Sartini
Chris31		C9 xlt Celestron
ASI 294MM PRO / R / 180.0		-5.9 ± 3.02
Qatar-5b (LOW)
2025-08-08		Patrick Farizy
Patrick Farizy		Celestron C8
Touptek 585 C / Clear / 36.0		1.01 ± 3.89
Qatar-5b (LOW)
2025-08-08		Miguel Ángel Álava Amat
Sarriguren		Meade SC 8"
Asi 1600 MM / Lum / 240.0		-1.15 ± 3.02
Qatar-5b (LOW)
2025-08-08		Alvaro Fornas
MPC J57. Centro Astronómico Alto Turia		Planewave CDK 17
QHY600M / Lum / 180.0		-1.61 ± 0.71
Qatar-5b (LOW)
2025-08-08		Javier Elias
Observatorio Astrocamp		Planewave CDK
QHY628M / R / 120.0		-8.93 ± 1.58
Qatar-5b (LOW)
2025-08-08		Tommaso Dittadi
TD-TRO		Ritchey-Chretien
Moravian G2-1600 / R / 240.0		-9.79 ± 2.74
Qatar-5b (LOW)
2025-01-09		Adrian Jones
Private Observatory (I64)		Meade ACF 30cm
QSI 583 / R / 200.0		-0.2 ± 3.02
Qatar-5b (LOW)
2025-01-09		Mark Salisbury
POST		Orion Optics ODK
SBIG ST-10 XME / Clear / 240.0		-1.12 ± 1.28
Qatar-5b (LOW)
2025-01-09		Snaevarr Guðmundsson
Ness Observatory		Meade LX 200 ACF Schmidt-Cassegrain
SBIG STL 11000M / AstrodonExoPlanet-BB / 120.0		-1.35 ± 1.73
Qatar-5b (LOW)
2025-01-09		Daniel Kustrin
Daniel Kustrin		Sky Watcher Classic 200P
ZWO ASI2600MM-Pro / R / 180.0		-7.55 ± 3.02
Qatar-5b (LOW)
2024-10-29		Snaevarr Guðmundsson
Ness Observatory		Meade LX 200 ACF Schmidt-Cassegrain
SBIG STL 11000M / AstrodonExoPlanet-BB / 120.0		-4.09 ± 1.18
Qatar-5b (LOW)
2024-10-03		Gustavo Muler
Obs. Nazaret J47		lx 200
ST8 XME AO8 / R / 120.0		-4.9 ± 1.58
Qatar-5b (LOW)
2024-10-03		John Collins
JC_Wrexham		Meade LX200GPS
ASI-290m / rpr / 120.0		-7.06 ± 2.16
Qatar-5b (LOW)
2024-08-18		Dim Stouraitis
Galilaios		SCT
SXVF-H9 Starlight-Xpress / R / 130.0		-9.84 ± 3.46
Qatar-5b (LOW)
2024-08-16		Alvaro Fornas
MPC J57. Centro Astronómico Alto Turia		Planewave CDK 17
QHY600M / Lum / 300.0		-0.93 ± 1.07
Qatar-5b (LOW)
2023-11-30		Adrian Jones
Private Observatory (I64)		Meade ACF 30cm
QSI 583 / R / 200.0		2.0 ± 2.02
Qatar-5b (LOW)
2023-11-30		Martin Crow
Burnham Observatory		Celestron C9.25
SX694 mono / R / 200.0		0.46 ± 1.34
Qatar-5b (LOW)
2023-11-30		David Bennett
Rickford Observatory		GSO RC
ZWO ASI2600MM Pro / Lum / 60.0		-2.9 ± 1.07
Qatar-5b (LOW)
2023-11-30		Ian Sharp
PixelSkies		Celestron C11 Edge HD
Starlight Xpress Trius Pro SX694 / R / 120.0		-7.94 ± 2.3
Qatar-5b (LOW)
2023-11-07		Simon Dawes
William James II		Celestron Edge11 HD
Risingcam Monochrome SONY imx571 / Clear / 300.0		-0.61 ± 2.16
Qatar-5b (LOW)
2023-11-07		Mark Salisbury
POST		Orion Optics ODK
SBIG ST-10 XME / R / 240.0		-0.92 ± 0.95
Qatar-5b (LOW)
2023-10-27		Bryan Martin
Tiger Butte Observatory Remote		AG Optical IDK
ZWO ASI 294 / AstrodonExoPlanet-BB / 120.0		-4.8 ± 4.61
Qatar-5b (LOW)
2023-08-27		Dim Stouraitis
Galilaios		SCT
SXVF-H9 Starlight-Xpress / R / 150.0		-3.28 ± 3.46
Qatar-5b (LOW)
2023-08-25		Mark van der Grijp
Trevinca Observatory		William Optics FLT132
Poseidon-M Pro / Lum / 30.0		1.62 ± 2.3
Qatar-5b (LOW)
2022-11-18		Vikrant Kumar Agnihotri
Cepheid Observatory India		GSO Ritchey–Chrétien
SX-35 TRIUS mono (KAF11002) / Lum / 120.0		-1.24 ± 2.16
Qatar-5b (LOW)
2022-11-10		Martin Crow
Burnham Observatory		Celestron C9.25
SX694 mono / R / 120.0		3.5 ± 3.17
Qatar-5b (LOW)
2022-10-20		Simon Dawes
William James II Observatory		Skywatcher MN190 2
ZWO ASI 1600MM-PRO USB 3.0 Mono Camera / Lum / 180.0		-4.15 ± 2.88
Qatar-5b (LOW)
2022-10-18		Francesco Scaggiante
Gruppo Astrofili Salese "GALILEO GALILEI"		NEWTON 410/1710
Custom made with KAF-1603ME CCD sensor / R / 80.0		4.78 ± 3.31
Qatar-5b (LOW)
2022-10-18		Martin Crow
Burnham Observatory		Celestron C9.25
SX694 mono / R / 120.0		0.31 ± 1.58
Qatar-5b (LOW)
2022-09-04		Dim Stouraitis
Galilaios		SCT
SXVF-H9 Starlight-Xpress / R / 100.0		-6.64 ± 3.17
Qatar-5b (LOW)
2022-09-01		Vojtěch Školník
Broumov NM Observatory		Meade LX90 ACF
MI C2-7000A / Clear / 120.0		-7.65 ± 2.16
Qatar-5b (LOW)
2022-08-09		Martin Crow
Burnham Observatory		Celestron C9.25
SX694 mono / Clear / 60.0		1.83 ± 2.45
Qatar-5b (LOW)
2022-08-07		David Molina
Anunaki Observatory Z51		Schmidt Cassegrain
SBIG ST-9xe / Clear / 120.0		1.11 ± 1.73
Qatar-5b (LOW)
2022-08-07		Adrian Jones
Private Observatory (I64)		Meade ACF 30cm
QSI 583 / R / 150.0		0.67 ± 1.3
Qatar-5b (LOW)
2022-08-07		Paul De Backer
PaulDB		RC10
ASI294MM-Pro / R / 230.0		-0.77 ± 1.87
Qatar-5b (LOW)
2022-08-07		Eric Miny
BLOIS SOLOGNE ASTRONOMIE OBSERVATORY		Newton T305
QSI 683WS / Lum / 120.0		-2.64 ± 1.73
Qatar-5b (LOW)
2022-01-11		Tõnis Eenmäe
Tartu Observatory		Planewave CDK 12.5
Apogee Alta U42 / R / 120.0		5.37 ± 2.02
Qatar-5b (LOW)
2021-10-28		Bernhard Wenzel
Vienna Little Telescope - Department of Astrophysics		Cassegrain A=80 cm F=6,64 m
FLI Proline PL16803 / V / 60.0		-1.71 ± 0.75
Qatar-5b (LOW)
2021-08-17		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / Lum / 120.0		1.05 ± 1.15
Qatar-5b (LOW)
2021-08-15		Vojtěch Školník
Hvezdarna Valasske Mezirici		Meade LX90 ACF
MI C2-7000A / Clear / 180.0		1.34 ± 1.15
Qatar-5b (LOW)
2020-11-05		John Savage
Z42 Rushay Farm Observatory		Celestron 14Edge
ZWO ASI6200MM / R / 60.0		4.96 ± 2.02
Qatar-5b (LOW)
2020-10-31		Pere Guerra
Observatori Astronòmic Albanyà		16" Meade ACF F8
Moravian G4-9000 / AstrodonExoPlanet-BB / 100.0		3.51 ± 1.87
Qatar-5b (LOW)
2020-10-10		Carmelo Falco
GALHassin Robotic Telescope 2 (GRT2)		Giacometti-Fogale RC16
Andor Apogee Aspen CG16M / Lum / 90.0		0.61 ± 0.58
Qatar-5b (LOW)
2020-09-17		Danilo Sedita
Osservatorio Sedita Castrofilippo		RC GSO 14"
Moravian G2-1600 / R / 60.0		-0.56 ± 1.58
Qatar-5b (LOW)
2017-08-21		Anaël Wünsche
Observatoire des Baronnies Provençales		Astelco
FLIPL230 / Lum / 120.0		3.69 ± 0.86
Qatar-5b (LOW)
2017-08-21		Mario Morales-Aimar
Observatorio de Sencelles MPC K14		10" Meade Schmidt Cassegrain
SBIG ST7-XME / Clear / 120.0		-0.63 ± 2.88

Space Observations
Planet
Observation Date		 Mission O-C
minutes
Qatar-5b (LOW)
2022-10-26		TESS0.61 ± 1.58
Qatar-5b (LOW)
2022-10-23		TESS-4.29 ± 1.73
Qatar-5b (LOW)
2022-10-20		TESS-2.13 ± 1.44
Qatar-5b (LOW)
2022-10-18		TESS2.18 ± 1.58
Qatar-5b (LOW)
2022-10-15		TESS1.35 ± 1.41
Qatar-5b (LOW)
2022-10-09		TESS-0.56 ± 1.38
Qatar-5b (LOW)
2022-10-06		TESS-2.87 ± 1.44
Qatar-5b (LOW)
2022-10-03		TESS-0.85 ± 1.44
Qatar-5b (LOW)
2019-10-28		TESS0.13 ± 1.73
Qatar-5b (LOW)
2019-10-25		TESS3.87 ± 1.44
Qatar-5b (LOW)
2019-10-22		TESS-0.59 ± 1.87
Qatar-5b (LOW)
2019-10-14		TESS2.86 ± 1.73
Qatar-5b (LOW)
2019-10-11		TESS2.51 ± 1.35
Qatar-5b (LOW)
2019-10-08		TESS0.47 ± 1.38

Literature Mid-times
Planet
Observation Date		 Reference O-C
minutes
2018-08-11 Mallonn et al. 2019 6.32 ± 1.83
2018-08-11 Mallonn et al. 2019 4.55 ± 2.22
2015-11-10 Alsubai et al. 2017 -0.19 ± 0.14
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