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) 89 (19)
O-C 0.03 ± 0.19 minutes
ExoClock Observations (Recent) 86 (19)
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)
2024-09-28
Massimiliano Mannucci
Osservatorio Astronomico Margherita Hack
Celestron C14
SBIG ST10 XME / R / 240.0
-0.66 ± 1.18
Qatar-4b (LOW)
2024-09-17
John Collins
JC_Wrexham
Meade LX200GPS
ASI-290m / rpr / 60.0
-3.63 ± 2.02
Qatar-4b (LOW)
2024-09-08
Enrique Arce
Vallbona Observatory
Ritchey Chretien
ZWO ASI 294 MM PRO / Lum / 300.0
-0.2 ± 1.24
Qatar-4b (LOW)
2024-08-30
Alberto Tomatis
Alto-Observatory
RC
QHY 268M / Lum / 67.0
1.47 ± 1.44
Qatar-4b (LOW)
2024-08-21
Matthieu Bachschmidt
Gonachon
Celestron C11
SBIG ST8XME / AstrodonExoPlanet-BB / 120.0
2.37 ± 1.58
Qatar-4b (LOW)
2024-08-12
Claudio Lopresti
Claudio Lopresti
Mak-Newton
CCD Sbig ST10xme / Lum / 240.0
1.82 ± 2.02
Qatar-4b (LOW)
2024-08-11
A.Rosich, JM. Llenas ||
Observatori de Pujalt
PW CDK20
ZWO ASI 2600MM Pro / gpr / 180.0
1.05 ± 1.44
Qatar-4b (LOW)
2024-08-11
Alberto García Sánchez
Rio Cofio
MEADE LX200 Classic
SBIG ST8-XME / Clear / 160.0
0.86 ± 1.27
Qatar-4b (LOW)
2024-08-02
Esteban Reina
Observatori de Masquefa
Meade LX200
ZWO ASI 294 MM Pro / R / 120.0
-4.83 ± 2.3
Qatar-4b (LOW)
2024-07-14
Martin Crow
Burnham Observatory
Celestron C9.25
SX694 mono / Clear / 240.0
3.78 ± 1.34
Qatar-4b (LOW)
2024-07-05
Yves Jongen
Rasteau Observatory
Plane Wave CDK 17"
SBIG STXL 11002 / Lum / 180.0
-2.87 ± 2.74
Qatar-4b (LOW)
2024-01-12
Ivo Peretto
MarSEC Marana Space Explorer Center
R-C
Moravia G2-1600 MkII / R / 150.0
-0.69 ± 1.73
Qatar-4b (LOW)
2023-12-25
Giuseppe Marino
Gruppo Astrofili Catanesi
Newtonian
SBIG ST-7 XME / Clear / 300.0
5.3 ± 1.43
Qatar-4b (LOW)
2023-12-16
Yves Jongen
Rasteau Observatory
Plane Wave CDK 17"
SBIG STXL 11002 / Lum / 120.0
1.51 ± 0.71
Qatar-4b (LOW)
2023-12-16
Francesco Scaggiante
Gruppo Astrofili Salese "GALILEO GALILEI"
NEWTON 410/1710
Player One Astronomy Poseidon-M Pro (IMX571) / R / 120.0
-3.34 ± 2.16
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)
2023-09-21
Manfred Raetz
privat observatory Herges-Hallenberg
SCT 280/1850 (C11 with Starizona reducer)
Moravian Instruments G2-1600 / AstrodonExoPlanet-BB / 120.0
1.26 ± 0.95
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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