exoclock

Qatar-7b (LOW)

Discovered by: Alsubai et al. 2019

The Star
Simbad
GAIA
2MASS		 Qatar 7
DR2 2878923523472328704
J23540364+3701185
RA 23:54:03.6389 DEC +37:01:18.584
Parallax
1.388 mas		 P.M. RA
-5.189 mas/y		 P.M. DEC
-1.129 mas/y
MagV
13.03		 MagR
13.02		 MagI
12.878		 MagJ
11.859		 MagH
11.599		 MagK
11.561
MagG
12.927		 MagGBP
13.267		 MagGRP
12.43
*Calculated from GAIA magnitudes.

Ephemeris - Verified True
Kokori et al. 2025
Mid-time
2458650.89581 ± 0.00015 BJDTDB
Period
2.03202355 ± 3.6e-07 days
Transit Parameters
Alsubai et al. 2019
Rp/Rs
0.11 ± 0.001		 a/Rs
4.84 +0.05 -0.05
 i
89.0 +1.0 -1.0 deg
e
-		 ω
- deg
DepthR*
15.92 mmag		 Duration*
3.58 hours
*Calculated from the other parameters, using PyLightcurve.
**Adjusted based on the space observations.

Limb Darkening Parameters
Alsubai et al. 2019
Teff
6387.0 +38.0 -38.0 K
 Log(g)
4.2 +0.03 -0.03 cm/s2
 Fe/H
0.276 +0.071 -0.071 dex
ExoClock Status
Observing Priority LOW
Minimum aperture 7.96"
Total Observations (Recent) 45 (8)
O-C -1.13 ± 0.5 minutes
ExoClock Observations (Recent) 32 (8)
Space Observations (Recent) 12 (0)
ETD Observations (Recent) 0 (0)
Literature Mid-times (Recent) 1 (0)
Kepler Rp/Rs -
TESS Rp/Rs 0.10333 ± 0.00089

Qatar-7b


ExoClock Observations
Planet
Observation Date		 Observer
Observatory		 Telescope
Camera / Filter / Exp [s]		 O-C
minutes
Qatar-7b (LOW)
2025-12-16		Snaevarr Guðmundsson
Ness Observatory		Meade LX 200 ACF Schmidt-Cassegrain
SBIG STL 11000M / R / 120.0		-1.79 ± 1.87
Qatar-7b (LOW)
2025-10-27		Jordi González-Edo
Landete-Kea		C11
ASI 2600MM pro / Lum / 90.0		-0.94 ± 1.87
Qatar-7b (LOW)
2025-10-24		Pieter Vuylsteke
Marvel (La Palma)		ASA Ritchey
ZWO 6200mm / rpr / 200.0		-2.24 ± 0.84
Qatar-7b (LOW)
2025-10-18		samuel Diaz Lopez
Tomas Lopez (AstroCamp)		SCA260
ASI2600MM / rpr / 180.0		2.65 ± 1.58
Qatar-7b (LOW)
2025-08-20		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / Lum / 180.0		0.04 ± 1.73
Qatar-7b (LOW)
2025-08-18		Tommaso Dittadi
TD-TRO		Ritchey-Chretien
Moravian G2-1600 / R / 240.0		0.65 ± 5.04
Qatar-7b (LOW)
2025-08-18		Vojtěch Školník
Broumov NM Observatory		Meade LX90 ACF
MI C2-7000A / Clear / 120.0		-2.13 ± 1.41
Qatar-7b (LOW)
2025-08-18		Wilfried Hartmann
Observatory Stargate, Austria		Skywatcher 8" f/4
QHY MiniCam8 Mono / R / 120.0		-5.83 ± 5.47
Qatar-7b (LOW)
2024-12-01		Francesco Scaggiante
Gruppo Astrofili Salese "GALILEO GALILEI"		NEWTON 410/1710
Player One Astronomy Poseidon-M Pro (IMX571) / rpr / 150.0		2.11 ± 4.32
Qatar-7b (LOW)
2024-12-01		Giancarlo Madiai
GMAD48		SC8
ASI 432 MM / R / 120.0		-4.08 ± 3.31
Qatar-7b (LOW)
2024-10-05		Snaevarr Guðmundsson
Ness Observatory		Meade LX 200 ACF Schmidt-Cassegrain
SBIG STL 11000M / R / 120.0		1.76 ± 1.73
Qatar-7b (LOW)
2024-10-05		Livia Moretti
Leavitt Observatory		Ritchey-Chrétien 10'' f/8
QHY268 / R / 240.0		-2.85 ± 1.87
Qatar-7b (LOW)
2023-12-10		Bryan Martin
Tiger Butte Observatory Remote		AG Optical IDK
ZWO ASI 294 / Lum / 180.0		1.74 ± 3.6
Qatar-7b (LOW)
2023-11-21		Ian Sharp
PixelSkies		Celestron C11 Edge HD
Starlight Xpress Trius Pro SX694 / R / 90.0		3.05 ± 2.3
Qatar-7b (LOW)
2023-09-30		Joan Josep Isach Cogollos
Centro Astronómico Alto Turia (CAAT). MPC J57		Skywatcher
ZWO ASI 1600 MM / Lum / 120.0		-7.87 ± 2.16
Qatar-7b (LOW)
2023-09-26		Ramon Naves
Montcabrer		Meade LX200 12" ACF
Moravian G4-9000 / rpr / 60.0		3.28 ± 2.16
Qatar-7b (LOW)
2023-09-26		samuel Diaz Lopez
Tomas Lopez (Astrocamp)		N-AG8
ASI533MM / rpr / 120.0		-3.2 ± 2.74
Qatar-7b (LOW)
2023-09-26		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / Lum / 120.0		-3.23 ± 1.09
Qatar-7b (LOW)
2023-09-23		Adam Popowicz
Otivar dome2		Newton 12" ASA
ASI ZWO 1600MM / R / 240.0		-0.71 ± 2.74
Qatar-7b (LOW)
2023-07-27		jean paul vergne
CH9-gapra		Ritchey Chretien
zwo 294mm pro / Clear / 180.0		0.99 ± 4.46
Qatar-7b (LOW)
2023-07-20		Dim Stouraitis
Galilaios		SCT
SXVF-H9 Starlight-Xpress / R / 130.0		8.58 ± 3.17
Qatar-7b (LOW)
2022-10-21		Vikrant Kumar Agnihotri
Cepheid Observatory India		GSO Ritchey–Chrétien
SX-35 TRIUS mono (KAF11002) / Lum / 120.0		6.21 ± 3.31
Qatar-7b (LOW)
2022-09-08		David Arnot
OSO PIRATE		PlaneWave Instruments CDK24 24 inch (610 mm) f/6.5 Corrected Dall-Kirkham Astrograph
FLI ProLine KAF-16803 / R / 70.0		-0.94 ± 1.41
Qatar-7b (LOW)
2022-09-06		Robert Roth
TURMX Observatory		CFF Telescopes 160mm APO
ZWO ASI6200MM Pro / Lum / 120.0		4.51 ± 2.02
Qatar-7b (LOW)
2022-07-28		Bryan Martin
Tiger Butte Observatory		AG Optical IDK
ZWO ASI 294 / Clear / 120.0		-4.75 ± 2.88
Qatar-7b (LOW)
2021-12-18		Michael Irzyk
Melun		C14
H694 / AstrodonExoPlanet-BB / 60.0		2.4 ± 1.87
Qatar-7b (LOW)
2021-12-18		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / Lum / 120.0		-0.76 ± 1.58
Qatar-7b (LOW)
2021-12-16		Claudio Lopresti
Claudio Lopresti		Meade LX200 12"
CCD Sbig ST9xe / Lum / 180.0		0.85 ± 4.32
Qatar-7b (LOW)
2021-12-16		Fabio Mortari
Hypatia Observatory		Ritchey Chretienne 250mm f/5.3
Sbig ST8-XE / R / 250.0		-3.47 ± 4.32
Qatar-7b (LOW)
2021-12-14		Stephen M. Brincat
Flarestar Observatory - MPC Code:171		Meade SCT
Moravian G2-1600 / AstrodonExoPlanet-BB / 120.0		3.19 ± 2.02
Qatar-7b (LOW)
2021-12-02		Chia-Ming Chang
NTHU Observatory		Showa 250mm Refractor
ASI 6200MM Pro / Lum / 60.0		-0.93 ± 2.74
Qatar-7b (LOW)
2021-11-26		Taewoo Kim
Deokheung Optical Astronomy Observatory		NYSC 1m Telescope
FLI PL-16803 or PI SOPHIA-2048B / R / 120.0		-0.39 ± 0.58

Space Observations
Planet
Observation Date		 Mission O-C
minutes
Qatar-7b (LOW)
2022-10-27		TESS0.64 ± 1.58
Qatar-7b (LOW)
2022-10-25		TESS0.24 ± 2.3
Qatar-7b (LOW)
2022-10-23		TESS2.14 ± 2.02
Qatar-7b (LOW)
2022-10-21		TESS-0.85 ± 1.73
Qatar-7b (LOW)
2022-10-19		TESS0.34 ± 1.87
Qatar-7b (LOW)
2022-10-17		TESS-0.2 ± 2.16
Qatar-7b (LOW)
2022-10-15		TESS0.26 ± 1.73
Qatar-7b (LOW)
2022-10-09		TESS-1.94 ± 2.02
Qatar-7b (LOW)
2022-10-07		TESS2.42 ± 2.02
Qatar-7b (LOW)
2022-10-05		TESS1.59 ± 2.02
Qatar-7b (LOW)
2022-10-03		TESS1.19 ± 1.58
Qatar-7b (LOW)
2022-10-01		TESS-1.08 ± 1.87

Literature Mid-times
Planet
Observation Date		 Reference O-C
minutes
2017-10-16 Alsubai et al. 2019 -0.03 ± 0.23
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