exoclock
exoclock
Qatar-4b
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. 2020
Mid-time
2458293.1227 ± 0.00015 BJDTDB
Period
1.805369 ± 6e-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

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
Total Observations (Recent)
O-C minutes
Total Literature Mid-times
LOW
30 (2)
-2.32±0.15
1
Qatar-4b


ExoClock Observations
Observation
Date
Observer
Observatory
Telescope
Camera / Filter / Exp [s]
O-C
minutes
2021-08-31 Kevin Hills
Tacande
ASA 0.5m f/3.6 astrograph.
QHY 600M with IMX 455 chip / R / 90.0
-5.6 ± 0.9
2021-07-16 Dim Stouraitis
Galilaios
SCT
SXVF-H9 Starlight-Xpress / R / 90.0
-4.0 ± 1.6
2020-12-24 John Savage
Z42 Rushay Farm Observatory
Celestron 14Edge
ZWO ASI6200MM / R / 180.0
-2.1 ± 1.3
2020-11-18 Yves Jongen
Rasteau Observatory
Plane Wave CDK 17"
SBIG STXL 11002 / Lum / 120.0
-4.9 ± 0.9
2020-11-07 Lorenzo Betti
Osservatorio Polifunzionale del Chianti
Ritchey-Chretien
Moravian G4 - KAF 09000 / V / 90.0
-5.5 ± 0.6
2020-11-02 Taewoo Kim
Deokheung Optical Astronomy Observatory
NYSC 1m Telescope
FLI PL-16803 or PI SOPHIA-2048B / R / 120.0
-5.6 ± 0.6
2020-09-12 Manfred Raetz
privat observatory Herges-Hallenberg
SCT 280 /1790 (Celestron C11 with reducer)
Moravian Instruments G2-1600 / Clear / 120.0
-3.8 ± 1.0
2020-08-25 Anaël Wünsche
Observatoire des Baronnies Provençales
Astelco2
ZWO ASI6200 / Clear / 120.0
-2.5 ± 0.4
2020-08-25 Alberto Tomatis
Alto-Observatory
RC
STL 6303 / Lum / 240.0
-3.7 ± 0.7
2020-08-25 Vojtěch Školník
Hvezdarna Valasske Mezirici
Meade LX90 ACF
Meade DSI II / Clear / 180.0
-3.8 ± 1.0
2020-08-25 Yves Jongen
Rasteau Observatory
Plane Wave CDK 17"
SBIG STXL 11002 / Clear / 120.0
-4.0 ± 0.9
2020-07-27 Francois Regembal
HRTobs
Astrosib RC360
SBIG STX 16803 / Lum / 60.0
-3.8 ± 1.3
2020-07-09 Yves Jongen
Rasteau Observatory
Plane Wave CDK 17"
SBIG STXL 11002 / Clear / 120.0
-0.1 ± 1.2
2020-07-09 Marc Bretton
Observatoire des Baronnies Provençales
Astelco 800mm
ZWO ASI6200 / Clear / 120.0
-3.8 ± 0.7
2020-01-07 Yves Jongen
Rasteau Observatory
Plane Wave CDK 17"
SBIG STXL 11002 / Clear / 120.0
-3.1 ± 1.9
2019-11-21 Ferran Grau Horta
Ca L'Ou
Meade ACF 16''
FLI Proline PL1001 / Clear / 300.0
-2.8 ± 1.7
2019-11-12 Yves Jongen
Rasteau Observatory
Plane Wave CDK 17"
SBIG STXL 11002 / Clear / 120.0
-2.7 ± 1.4
2019-10-16 Mario Morales Aimar
Observatorio de Sencelles MPC K14
10" Meade Schmidt Cassegrain
SBIG ST7-XME / Clear / 500.0
1.1 ± 1.3
2019-10-07 Yves Jongen
Rasteau Observatory
Plane Wave CDK 17"
SBIG STXL 11002 / Clear / 120.0
-2.6 ± 1.2
2019-10-05 Anaël Wünsche
Observatoire des Baronnies Provençales
Astelco
FLIPL230 / Clear / 120.0
-0.1 ± 0.4 - Data available
2019-10-05 Yves Jongen
Rasteau Observatory
Plane Wave CDK 17"
SBIG STXL 11002 / Clear / 120.0
-2.6 ± 0.7
2019-09-17 Yves Jongen
Rasteau Observatory
Plane Wave CDK 17"
SBIG STXL 11002 / Clear / 120.0
-4.2 ± 1.2
2019-08-21 Dim Stouraitis
Galilaios
SCT
SXVF-H9 Starlight-Xpress / R / 60.0
-3.0 ± 1.3
2019-07-23 Yves Jongen
Rasteau Observatory
Plane Wave CDK 17"
SBIG STXL 11002 / Clear / 120.0
-1.2 ± 0.9
2019-01-20 Yves Jongen
Rasteau Observatory
Plane Wave CDK 17"
SBIG STXL 11002 / Clear / 120.0
-1.8 ± 1.2
2019-01-02 Yves Jongen
Rasteau Observatory
Plane Wave CDK 17"
SBIG STXL 11002 / Clear / 120.0
0.9 ± 1.6
2018-12-24 Yves Jongen
Rasteau Observatory
Plane Wave CDK 17"
SBIG STXL 11002 / Clear / 120.0
1.1 ± 0.9
2018-01-24 Anaël Wünsche
Observatoire des Baronnies Provençales
Astelco
FLIPL230 / Lum / 120.0
0.2 ± 0.4 - Data available
2017-09-05 Marc Deldem
Les Barres Observatory
Celestron C8
SBIG ST8-XME / Clear / 150.0
-1.7 ± 1.7 - Data available
2016-12-30 Claudio Lopresti
Claudio Lopresti
Makutov-Cassegrain
CCD Sbig ST8xme / R / 240.0
1.5 ± 2.0 - Data available


Literature Mid-times
Observation
Date
Mid-time Time format Reference O-C
minutes
2016-09-06 2457637.77361 ± 0.00046 BJD_TDB Alsubai et al. 2017 -0.2 ± 0.7
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