exoclock

Qatar-4b (LOW)

Discovered by: Alsubai et al. 2017

The Star
Simbad
GAIA
2MASS		 Qatar 4
DR2 385697172809355392
J00192622+4401395
RA 00:19:26.2245 DEC +44:01:39.484
Parallax
3.011 mas		 P.M. RA
0.985 mas/y		 P.M. DEC
-8.866 mas/y
MagV
13.6		 MagR
13.68		 MagI*
12.636		 MagJ
12.03		 MagH
11.631		 MagK
11.519
MagG
13.411		 MagGBP
13.892		 MagGRP
12.783
*Calculated from GAIA magnitudes.

Ephemeris - Verified True
Kokori et al. 2022
Mid-time
2458919.58363 ± 0.00015 BJDTDB
Period
1.80536403 ± 5.4e-07 days
Transit Parameters
Alsubai et al. 2017
Rp/Rs
0.138 ± 0.003		 a/Rs
7.1 +0.5 -0.5
 i
87.5 +1.6 -1.6 deg
e
-		 ω
- deg
DepthR*
25.42 mmag		 Duration*
2.14 hours
*Calculated from the other parameters, using PyLightcurve.
**Adjusted based on the space observations.

Limb Darkening Parameters
Alsubai et al. 2017
Teff
5215.0 +50.0 -50.0 K
 Log(g)
4.53 +0.06 -0.06 cm/s2
 Fe/H
0.1 +0.08 -0.08 dex
ExoClock Status
Observing Priority LOW
Minimum aperture 10.08"
Total Observations (Recent) 73 (13)
O-C -0.22 ± 0.19 minutes
ExoClock Observations (Recent) 70 (13)
Space Observations (Recent) 0 (0)
ETD Observations (Recent) 0 (0)
Literature Mid-times (Recent) 3 (0)
Kepler Rp/Rs -
TESS Rp/Rs -

Qatar-4b


ExoClock Observations
Planet
Observation Date		 Observer
Observatory		 Telescope
Camera / Filter / Exp [s]		 O-C
minutes
Qatar-4b (LOW)
2023-11-17		Claudio Lopresti
Claudio Lopresti		Meade LX200 12"
CCD Sbig ST9xe / I / 180.0		-0.86 ± 1.44
Qatar-4b (LOW)
2023-11-08		Emanuele Pavoni
Leavitt Observatory		RC
QHY268 / R / 150.0		2.48 ± 1.37
Qatar-4b (LOW)
2023-10-18		Bryan Martin
Tiger Butte Observatory Remote		AG Optical IDK
ZWO ASI 294 / Lum / 180.0		4.31 ± 1.87
Qatar-4b (LOW)
2023-10-01		Marco Stefanini
Osservatorio Aldebaran		Celestron C14
QHY294M Pro / Lum / 150.0		-2.06 ± 1.44
Qatar-4b (LOW)
2023-09-22		Mark Salisbury
POST		Orion Optics ODK
SBIG ST-10 XME / Clear / 240.0		0.04 ± 0.4
Qatar-4b (LOW)
2023-09-03		Simon Dawes
William James II		Celestron Edge11 HD
Risingcam Monochrome SONY imx571 / Lum / 300.0		4.31 ± 1.73
Qatar-4b (LOW)
2023-08-25		samuel Diaz Lopez
Tomas Lopez (Astrocamp)		N-AG8
ASI533MM / AstrodonExoPlanet-BB / 120.0		-0.79 ± 1.28
Qatar-4b (LOW)
2023-08-25		Ramon Naves
Montcabrer		Meade LX200 12" ACF
Moravian G4-9000 / Clear / 180.0		-1.85 ± 1.58
Qatar-4b (LOW)
2023-07-28		Dim Stouraitis
Galilaios		SCT
SXVF-H9 Starlight-Xpress / R / 180.0		-0.04 ± 1.58
Qatar-4b (LOW)
2023-06-30		Adam Popowicz
Otivar dome2		Newton 12" ASA
ASI ZWO 1600MM / R / 240.0		-3.17 ± 2.02
Qatar-4b (LOW)
2022-12-18		Adam Popowicz
Otivar dome2		Newton 12" ASA
ASI ZWO 1600MM / R / 240.0		-0.36 ± 1.58
Qatar-4b (LOW)
2022-11-23		Vikrant Kumar Agnihotri
Cepheid Observatory India		GSO Ritchey–Chrétien
SX-35 TRIUS mono (KAF11002) / Lum / 120.0		0.07 ± 3.31
Qatar-4b (LOW)
2022-11-20		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / Lum / 180.0		-0.95 ± 0.76
Qatar-4b (LOW)
2022-11-10		Jean-Claude MARIO
Observatoire de la Cabergue		T 500 Cassegrain "Arp 83"
ASI 6200 MM / Clear / 240.0		-0.94 ± 0.45
Qatar-4b (LOW)
2022-10-14		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / Lum / 180.0		0.51 ± 2.16
Qatar-4b (LOW)
2022-10-13		Adam Popowicz
Otivar dome2		Newton 12" ASA
ASI ZWO 1600MM / R / 240.0		1.32 ± 5.18
Qatar-4b (LOW)
2022-10-05		Alessandro Marchini
Astronomical Observatory University of Siena		Mak-Cas 0.3m f/5.6
Sbig STL-6303 / R / 300.0		-1.48 ± 1.58
Qatar-4b (LOW)
2022-10-05		Jacques Michelet
Claix		GSO Ritchey-Chrétien
QSI-632 / R / 180.0		-1.75 ± 1.08
Qatar-4b (LOW)
2022-09-06		Giovanni Calapai
Home Astronomical Observatory		Celestron 11 Schmidt-Cassegrain
Atik 314L+ / R / 120.0		-0.0 ± 1.87
Qatar-4b (LOW)
2022-08-28		David Molina
Anunaki Observatory Z51		Schmidt Cassegrain
SBIG ST-9xe / Clear / 120.0		-0.69 ± 1.01
Qatar-4b (LOW)
2022-08-27		David Arnot
OSO PIRATE		PlaneWave Instruments CDK24 24 inch (610 mm) f/6.5 Corrected Dall-Kirkham Astrograph
FLI ProLine KAF-16803 / R / 80.0		-2.31 ± 0.98
Qatar-4b (LOW)
2022-08-09		David Molina
Anunaki Observatory Z51		Schmidt Cassegrain
SBIG ST-9xe / Clear / 120.0		0.61 ± 0.86
Qatar-4b (LOW)
2022-08-09		Kevin Hills
Tacande		ASA 0.5m f/3.6 astrograph.
QHY 600M with IMX 455 chip / R / 60.0		0.47 ± 0.86
Qatar-4b (LOW)
2022-08-01		Claudio Lopresti
Claudio Lopresti		Mak-Newton
CCD Sbig ST10xme / Lum / 180.0		3.14 ± 4.32
Qatar-4b (LOW)
2022-07-03		Eric Miny
BLOIS SOLOGNE ASTRONOMIE OBSERVATORY		Newton T305
QSI 683WS / Lum / 180.0		-1.15 ± 2.59
Qatar-4b (LOW)
2022-01-27		Ian Sharp
Ham Observatory		Celestron C9.25 Edge HD
Starlight Xpress Trius Pro SX694 / R / 120.0		-4.36 ± 2.16
Qatar-4b (LOW)
2021-12-13		Francesco Scaggiante
Gruppo Astrofili Salese "GALILEO GALILEI"		NEWTON 410/1710
Custom made with KAF-1603ME CCD sensor / R / 120.0		3.13 ± 1.73
Qatar-4b (LOW)
2021-12-13		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / Lum / 120.0		0.54 ± 0.72
Qatar-4b (LOW)
2021-12-13		Dominique DANIEL
La Montjoie		Celestron CGX C8 XLT
Camera CMOS ZWO ASI294MC pro (color) / Clear / 240.0		-2.2 ± 3.46
Qatar-4b (LOW)
2021-12-11		Aziz Ettahar Kaeouach
High Atlas Observatory		PlaneWave CDK 12.5
Zwo asi 294 mm pro / Lum / 120.0		1.5 ± 1.3
Qatar-4b (LOW)
2021-11-23		Stephen Futcher
Hampshire Astronomical Group, Clanfield		Ritchey-Chrétien (SX-46)
Starlight Xpress SX-46 / R / 120.0		0.83 ± 0.86
Qatar-4b (LOW)
2021-11-05		Valère Perroud
Observatoire de Duines		RC 10
Moravian G2-4000 / Lum / 180.0		-3.43 ± 1.87
Qatar-4b (LOW)
2021-10-29		Taewoo Kim
Deokheung Optical Astronomy Observatory		NYSC 1m Telescope
FLI PL-16803 or PI SOPHIA-2048B / R / 180.0		-0.9 ± 1.01
Qatar-4b (LOW)
2021-10-27		Thomas Mollier
Tomastro		Newtonian
ZWO ASI1600MMC / Clear / 120.0		0.63 ± 1.3
Qatar-4b (LOW)
2021-10-27		Jacques Michelet
Claix		GSO Ritchey-Chrétien
QSI-632 / Clear / 180.0		-0.37 ± 1.44
Qatar-4b (LOW)
2021-10-27		Didier Laloum
Observatoire Privé du Mont (OPM)		RC 8 GSO
Atik 383L+ / AstrodonExoPlanet-BB / 150.0		-1.96 ± 1.3
Qatar-4b (LOW)
2021-10-26		Robert Roth
TURMX Observatory		CFF Telescopes 160mm APO
ZWO ASI6200MM Pro / Lum / 120.0		-1.15 ± 1.15
Qatar-4b (LOW)
2021-10-18		Claudio Lopresti
Claudio Lopresti		Meade LX200 12"
CCD Sbig ST9xe / Lum / 180.0		-0.63 ± 3.46
Qatar-4b (LOW)
2021-10-17		Giorgio Baj
M57		Ritchey-Chretien
Sbig STT1603 ME / Clear / 180.0		1.76 ± 2.02
Qatar-4b (LOW)
2021-10-17		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / Lum / 120.0		-1.84 ± 0.58
Qatar-4b (LOW)
2021-08-31		Kevin Hills
Tacande		ASA 0.5m f/3.6 astrograph.
QHY 600M with IMX 455 chip / R / 90.0		-0.45 ± 0.86
Qatar-4b (LOW)
2021-07-16		Dim Stouraitis
Galilaios		SCT
SXVF-H9 Starlight-Xpress / R / 90.0		0.99 ± 1.58
Qatar-4b (LOW)
2020-12-24		John Savage
Z42 Rushay Farm Observatory		Celestron 14Edge
ZWO ASI6200MM / R / 180.0		2.05 ± 1.3
Qatar-4b (LOW)
2020-11-18		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / Lum / 120.0		-0.86 ± 0.86
Qatar-4b (LOW)
2020-11-07		Lorenzo Betti
Osservatorio Polifunzionale del Chianti		RC-80cm
Moravian G4 - KAF 09000 / V / 90.0		-1.45 ± 0.58
Qatar-4b (LOW)
2020-11-02		Taewoo Kim
Deokheung Optical Astronomy Observatory		NYSC 1m Telescope
FLI PL-16803 or PI SOPHIA-2048B / R / 120.0		-1.61 ± 0.58
Qatar-4b (LOW)
2020-09-13		Manfred Raetz
privat observatory Herges-Hallenberg		SCT 280 /1790 (Celestron C11 with reducer)
Moravian Instruments G2-1600 / Clear / 120.0		-0.04 ± 1.01
Qatar-4b (LOW)
2020-08-25		Anaël Wünsche
Observatoire des Baronnies Provençales		Astelco2
ZWO ASI6200 / Clear / 120.0		1.17 ± 0.43
Qatar-4b (LOW)
2020-08-25		Alberto Tomatis
Alto-Observatory		RC
STL 6303 / Lum / 240.0		0.02 ± 0.72
Qatar-4b (LOW)
2020-08-25		Vojtěch Školník
Hvezdarna Valasske Mezirici		Meade LX90 ACF
Meade DSI II / Clear / 180.0		-0.12 ± 1.01
Qatar-4b (LOW)
2020-08-25		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / Clear / 120.0		-0.27 ± 0.86
Qatar-4b (LOW)
2020-07-28		Francois Regembal
HRTobs		Astrosib RC360
SBIG STX 16803 / Lum / 60.0		-0.23 ± 1.3
Qatar-4b (LOW)
2020-07-10		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / Clear / 120.0		3.43 ± 1.15
Qatar-4b (LOW)
2020-07-10		Marc Bretton
Observatoire des Baronnies Provençales		Astelco 800mm
ZWO ASI6200 / Clear / 120.0		-0.32 ± 0.72
Qatar-4b (LOW)
2020-01-07		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / Clear / 120.0		-0.27 ± 1.87
Qatar-4b (LOW)
2019-11-21		Ferran Grau Horta
Ca L'Ou		Meade ACF 16''
FLI Proline PL1001 / Clear / 300.0		-0.03 ± 1.87
Qatar-4b (LOW)
2019-11-12		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / Clear / 120.0		-0.15 ± 1.44
Qatar-4b (LOW)
2019-10-16		Mario Morales Aimar
Observatorio de Sencelles MPC K14		10" Meade Schmidt Cassegrain
SBIG ST7-XME / Clear / 500.0		3.54 ± 1.3
Qatar-4b (LOW)
2019-10-07		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / Clear / 120.0		-0.18 ± 1.15
Qatar-4b (LOW)
2019-10-06		Anaël Wünsche
Observatoire des Baronnies Provençales		Astelco
FLIPL230 / Clear / 120.0		2.36 ± 0.43
Qatar-4b (LOW)
2019-10-06		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / Clear / 120.0		-0.23 ± 0.72
Qatar-4b (LOW)
2019-09-17		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / Clear / 120.0		-1.9 ± 1.15
Qatar-4b (LOW)
2019-08-21		Dim Stouraitis
Galilaios		SCT
SXVF-H9 Starlight-Xpress / R / 60.0		-0.8 ± 1.3
Qatar-4b (LOW)
2019-07-23		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / Clear / 120.0		-3.07 ± 1.01
Qatar-4b (LOW)
2019-01-20		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / Clear / 120.0		-0.44 ± 1.15
Qatar-4b (LOW)
2019-01-02		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / Clear / 120.0		2.21 ± 1.58
Qatar-4b (LOW)
2018-12-24		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / Clear / 120.0		2.39 ± 0.86
Qatar-4b (LOW)
2018-01-24		Anaël Wünsche
Observatoire des Baronnies Provençales		Astelco
FLIPL230 / Lum / 120.0		0.15 ± 0.43
Qatar-4b (LOW)
2017-09-05		Marc Deldem
Les Barres Observatory		Celestron C8
SBIG ST8-XME / Clear / 150.0		-2.31 ± 1.73
Qatar-4b (LOW)
2016-12-30		Claudio Lopresti
Claudio Lopresti		Makutov-Cassegrain
CCD Sbig ST8xme / R / 240.0		-0.1 ± 2.02

Literature Mid-times
Planet
Observation Date		 Reference O-C
minutes
2018-07-17 Mallonn et al. 2019 -1.49 ± 1.48
2017-11-13 Wang et al. 2021 -0.37 ± 1.02
2016-09-06 Alsubai et al. 2017 -2.24 ± 0.66
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