exoclock

Qatar-8b (LOW)

Discovered by: Alsubai et al. 2019

The Star
Simbad
GAIA
2MASS		 Qatar 8
DR2 1076515002779544960
J10293910+7031378
RA 10:29:39.1059 DEC +70:31:37.649
Parallax
3.524 mas		 P.M. RA
-46.527 mas/y		 P.M. DEC
-9.597 mas/y
MagV
11.71		 MagR*
11.126		 MagI*
10.988		 MagJ
10.296		 MagH
10.005		 MagK
9.937
MagG
11.349		 MagGBP
11.698		 MagGRP
10.861
*Calculated from GAIA magnitudes.

Ephemeris - Verified True
Kokori et al. 2025
Mid-time
2459577.82937 ± 0.00013 BJDTDB
Period
3.7146472 ± 1.6e-06 days
Transit Parameters
Maciejewski 2020
Rp/Rs
0.1014 ± 0.0031		 a/Rs**
6.39 +0.05 -0.05
 i
84.6 +1.3 -1.1 deg
e
-		 ω
- deg
DepthR*
12.32 mmag		 Duration*
4.13 hours
*Calculated from the other parameters, using PyLightcurve.
**Adjusted based on the space observations.

Limb Darkening Parameters
Alsubai et al. 2019
Teff
5738.0 +51.0 -51.0 K
 Log(g)
4.21 +0.02 -0.02 cm/s2
 Fe/H
0.025 +0.071 -0.071 dex
ExoClock Status
Observing Priority LOW
Minimum aperture 5.0"
Total Observations (Recent) 65 (7)
O-C 1.55 ± 0.54 minutes
ExoClock Observations (Recent) 39 (7)
Space Observations (Recent) 25 (0)
ETD Observations (Recent) 0 (0)
Literature Mid-times (Recent) 1 (0)
Kepler Rp/Rs -
TESS Rp/Rs 0.10486 ± 0.00026

Qatar-8b


ExoClock Observations
Planet
Observation Date		 Observer
Observatory		 Telescope
Camera / Filter / Exp [s]		 O-C
minutes
Qatar-8b (LOW)
2026-04-03		Alexey Garmash
Lyceum 130		EdgeHD C11
ASI2600MM pro / rpr / 180.0		1.93 ± 1.01
Qatar-8b (LOW)
2026-03-27		Yoann Le Saux
Astrobreizh		Askar 600
ZWO 2600 / Clear / 120.0		-2.81 ± 3.6
Qatar-8b (LOW)
2026-03-19		Mika Hämäläinen
Amateur Astronomer		Newtonian
ASI183MM / Clear / 60.0		0.2 ± 3.46
Qatar-8b (LOW)
2026-03-19		Peter Teichrib
Samentha		APO130/910
ToupTek 2600M / Clear / 40.0		0.06 ± 2.45
Qatar-8b (LOW)
2025-12-31		Royston Morgan
Pineridge		Celestron Edge HD 800
ASI294MC pro / Clear / 110.0		-2.98 ± 2.88
Qatar-8b (LOW)
2025-09-30		Patrick Farizy
Patrick Farizy		Celestron C8
Touptek 585 C / Clear / 55.0		-1.71 ± 4.32
Qatar-8b (LOW)
2025-05-23		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / R / 120.0		7.58 ± 2.3
Qatar-8b (LOW)
2025-04-01		Gerold Holtkamp
Private		Newtonian
QHY268M / Lum / 24.0		5.22 ± 3.17
Qatar-8b (LOW)
2025-04-01		Simon Dawes
William James II		Celestron Edge11 HD
Risingcam Monochrome SONY imx571 / Lum / 120.0		-1.83 ± 1.87
Qatar-8b (LOW)
2025-02-22		Vojtěch Školník
Broumov NM Observatory		Meade LX90 ACF
MI C2-7000A / Clear / 90.0		3.31 ± 2.02
Qatar-8b (LOW)
2025-01-13		Jordi Gallego
Fosca Nit Observatory		Takahashi TOA-150
STL-11000 M / rpr / 120.0		2.04 ± 5.33
Qatar-8b (LOW)
2025-01-13		Ramon Naves
Montcabrer		Meade LX200 12" ACF
Moravian G4-9000 / rpr / 120.0		1.18 ± 1.44
Qatar-8b (LOW)
2025-01-13		Jordi Jofre
Curiosity Àger		TS Optics 94 EDPH
ASI 2600MM Pro / Lum / 180.0		1.03 ± 5.47
Qatar-8b (LOW)
2025-01-13		Jean-Claude MARIO
Bortle 45 observatory		T 520 Cassegrain Arp 83
Asi 6200MM / Clear / 60.0		0.6 ± 1.44
Qatar-8b (LOW)
2024-12-18		David González Martínez
GDAO		CELESTRON C8
ASI ZWO 294 MM PRO / R / 120.0		6.26 ± 3.74
Qatar-8b (LOW)
2024-08-09		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / Lum / 120.0		5.9 ± 3.46
Qatar-8b (LOW)
2024-04-01		Ramon Naves
Montcabrer		Meade LX200 12" ACF
Moravian G4-9000 / rpr / 120.0		0.65 ± 1.25
Qatar-8b (LOW)
2024-03-06		John Collins
JC_Wrexham		Meade LX200GPS
ASI-290m / rpr / 22.0		6.31 ± 2.74
Qatar-8b (LOW)
2024-03-06		Carmelo Falco
Racalmuto - G. Lemaitre Observatory		Ritchey-Chrétien 16” F/8 + RM500 Mount
Andor Aspen CG16M / Lum / 30.0		0.41 ± 2.45
Qatar-8b (LOW)
2024-03-06		Jacques Michelet
Claix		GSO Ritchey-Chrétien
Poseidon-M Pro / rpr / 120.0		-4.2 ± 1.58
Qatar-8b (LOW)
2024-01-26		Sacha Foschino
Observatoire des Baronnies Provençales		Planewave 430mm
SVO ASI 6200 MM Pro / R / 120.0		6.48 ± 1.87
Qatar-8b (LOW)
2024-01-14		Nikola Antonov
Meshtitsa		Sky-Watcher Explorer PDS
ASI 533MM Pro Mono CMOS / V / 60.0		8.27 ± 2.16
Qatar-8b (LOW)
2023-11-23		Snaevarr Guðmundsson
Ness Observatory		Meade LX 200 ACF Schmidt-Cassegrain
SBIG STL 11000M / Clear / 75.0		4.61 ± 2.02
Qatar-8b (LOW)
2023-04-03		Mark Salisbury
POST		Orion Optics ODK
SBIG ST-10 XME / R / 240.0		0.59 ± 0.84
Qatar-8b (LOW)
2023-04-03		Simon Dawes
William James II Observatory		Skywatcher MN190 2
ZWO ASI 1600MM-PRO USB 3.0 Mono Camera / Lum / 75.0		0.11 ± 2.3
Qatar-8b (LOW)
2023-03-20		Mark van der Grijp
Trevinca Observatory		William Optics FLT132
ZWO ASI2600mm Pro / Lum / 35.0		-1.2 ± 2.16
Qatar-8b (LOW)
2023-02-10		Miguel Ángel Álava Amat
Sarriguren		Meade SC 8"
Asi 1600 MM / Lum / 180.0		1.73 ± 1.41
Qatar-8b (LOW)
2023-02-10		Guillaume Bernard
Bernard Guillaume		Kepler GSO RC 200
ZWO ASI GT 1600 / Clear / 120.0		-5.42 ± 3.17
Qatar-8b (LOW)
2023-01-23		Charles Miller
Miller Observatory		Meade 12" LX850
QHY268M / AstrodonExoPlanet-BB / 60.0		-4.93 ± 1.87
Qatar-8b (LOW)
2022-04-16		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
FLI Kepler CMOS 4040 / R / 90.0		-1.78 ± 2.45
Qatar-8b (LOW)
2022-03-21		Manfred Raetz
privat observatory Herges-Hallenberg		SCT 280 /1790 (Celestron C11 with reducer)
Moravian Instruments G2-1600 / Clear / 120.0		-3.9 ± 1.58
Qatar-8b (LOW)
2022-02-26		Vikrant Kumar Agnihotri
Cepheid Observatory India		C11/f6.3 Schmidt-Cassegrain
SX-35 TRIUS mono (KAF11002) / Clear / 120.0		-4.07 ± 3.46
Qatar-8b (LOW)
2022-02-23		Simon Dawes
William James II Observatory		Skywatcher MN190 2
ZWO ASI 1600MM-PRO USB 3.0 Mono Camera / Lum / 60.0		-0.4 ± 2.02
Qatar-8b (LOW)
2022-01-16		Mark Phillips
Forthimage		OO Newtonian CCD
Atik 460EX / R / 55.0		2.58 ± 3.46
Qatar-8b (LOW)
2022-01-16		Paolo Arcangelo Matassa
P:M.P.H.R. Deep Sky (K81)		Ritchey Chretien 40cm-F5.3
CCD ICX453AQ / Lum / 120.0		2.15 ± 4.18
Qatar-8b (LOW)
2022-01-16		Andras Dan
Rocca1		Celestron C8
QHY 183 M / AstrodonExoPlanet-BB / 60.0		-0.01 ± 1.87
Qatar-8b (LOW)
2022-01-16		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
FLI Kepler CMOS 4040 / R / 120.0		-1.16 ± 2.02
Qatar-8b (LOW)
2021-12-07		Adrian Jones
Private Observatory (I64)		Meade ACF 30cm
QSI 583 / R / 100.0		4.2 ± 2.88
Qatar-8b (LOW)
2021-12-07		Paolo Arcangelo Matassa
P:M.P.H.R. Deep Sky (K81)		Ritchey Chretien 40cm-F5.3
CCD ICX453AQ / Lum / 120.0		2.9 ± 2.02

Space Observations
Planet
Observation Date		 Mission O-C
minutes
Qatar-8b (LOW)
2023-01-15		TESS1.47 ± 1.09
Qatar-8b (LOW)
2023-01-12		TESS-1.52 ± 1.04
Qatar-8b (LOW)
2023-01-04		TESS-1.09 ± 0.96
Qatar-8b (LOW)
2023-01-01		TESS1.0 ± 0.96
Qatar-8b (LOW)
2022-12-28		TESS0.45 ± 1.05
Qatar-8b (LOW)
2022-01-24		TESS0.98 ± 0.94
Qatar-8b (LOW)
2022-01-20		TESS-0.41 ± 0.88
Qatar-8b (LOW)
2022-01-16		TESS0.75 ± 0.95
Qatar-8b (LOW)
2022-01-13		TESS-0.21 ± 0.89
Qatar-8b (LOW)
2022-01-09		TESS0.17 ± 0.91
Qatar-8b (LOW)
2022-01-05		TESS-0.29 ± 0.91
Qatar-8b (LOW)
2022-01-02		TESS1.07 ± 0.95
Qatar-8b (LOW)
2021-08-17		TESS0.42 ± 0.92
Qatar-8b (LOW)
2021-08-13		TESS-1.09 ± 0.96
Qatar-8b (LOW)
2021-08-10		TESS1.14 ± 1.31
Qatar-8b (LOW)
2021-07-30		TESS0.6 ± 1.12
Qatar-8b (LOW)
2021-07-26		TESS1.17 ± 1.11
Qatar-8b (LOW)
2021-07-22		TESS0.19 ± 0.92
Qatar-8b (LOW)
2021-07-18		TESS-0.7 ± 1.01
Qatar-8b (LOW)
2021-07-15		TESS-2.07 ± 0.92
Qatar-8b (LOW)
2021-07-11		TESS-0.66 ± 0.92
Qatar-8b (LOW)
2021-07-07		TESS0.13 ± 0.91
Qatar-8b (LOW)
2021-07-04		TESS-1.06 ± 1.07
Qatar-8b (LOW)
2021-06-30		TESS-1.03 ± 0.91
Qatar-8b (LOW)
2021-06-26		TESS0.94 ± 0.94

Literature Mid-times
Planet
Observation Date		 Reference O-C
minutes
2018-04-02 Alsubai et al. 2019 0.86 ± 1.22
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