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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 - Not verified False
Mallonn et al. 2019
Mid-time
2457872.4717 ± 0.0005 BJDTDB
Period
1.80537 ± 4e-06 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
25 (11)
-2.91±0.15
1
Qatar-4b


ExoClock Observations
Obs. Date O-C (min) Observer
Observatory
Telescope
Camera / Filter / Exp [s]
2020-11-18 -5.9 ± 0.9 Yves Jongen
Rasteau Observatory
Plane Wave CDK 17"
SBIG STXL 11002 / Lum / 120.0
2020-11-07 -6.5 ± 0.6 Lorenzo Betti
Osservatorio Polifunzionale del Chianti
Ritchey-Chretien
Moravian G4 - KAF 09000 / V / 90.0
2020-11-02 -5.4 ± 0.6 Taewoo Kim
Deokheung Optical Astronomy Observatory
NYSC 1m Telescope
FLI PL-16803 or PI SOPHIA-2048B / R / 120.0
2020-09-12 -4.8 ± 1.0 Manfred Raetz
privat observatory Herges-Hallenberg
SCT 280 /1790 (Celestron C11 with reducer)
Moravian Instruments G2-1600 / Clear / 120.0
2020-08-25 -3.5 ± 0.4 Anaël Wünsche
Observatoire des Baronnies Provençales
Astelco2
ZWO ASI6200 / Clear / 120.0
2020-08-25 -4.6 ± 0.7 Alberto Tomatis
Alto-Observatory
RC
STL 6303 / Lum / 240.0
2020-08-25 -4.8 ± 1.0 Vojtěch Školník
Hvezdarna Valasske Mezirici
Meade LX90 ACF
Meade DSI II / Clear / 180.0
2020-08-25 -4.9 ± 0.9 Yves Jongen
Rasteau Observatory
Plane Wave CDK 17"
SBIG STXL 11002 / Clear / 120.0
2020-07-27 -4.7 ± 1.3 Francois Regembal
HRTobs
Astrosib RC360
SBIG STX 16803 / Lum / 60.0
2020-07-09 -1.0 ± 1.2 Yves Jongen
Rasteau Observatory
Plane Wave CDK 17"
SBIG STXL 11002 / Clear / 120.0
2020-07-09 -4.7 ± 0.7 Marc Bretton
Observatoire des Baronnies Provençales
Astelco 800mm
ZWO ASI6200 / Clear / 120.0
2020-01-07 -3.8 ± 1.9 Yves Jongen
Rasteau Observatory
Plane Wave CDK 17"
SBIG STXL 11002 / Clear / 120.0
2019-11-12 -3.4 ± 1.4 Yves Jongen
Rasteau Observatory
Plane Wave CDK 17"
SBIG STXL 11002 / Clear / 120.0
2019-10-07 -3.3 ± 1.2 Yves Jongen
Rasteau Observatory
Plane Wave CDK 17"
SBIG STXL 11002 / Clear / 120.0
2019-10-05 -0.7 ± 0.4 Anaël Wünsche
Observatoire des Baronnies Provençales
Astelco
FLIPL230 / Clear / 120.0
2019-10-05 -3.3 ± 0.7 Yves Jongen
Rasteau Observatory
Plane Wave CDK 17"
SBIG STXL 11002 / Clear / 120.0
2019-09-17 -4.9 ± 1.2 Yves Jongen
Rasteau Observatory
Plane Wave CDK 17"
SBIG STXL 11002 / Clear / 120.0
2019-08-21 -3.7 ± 1.3 Dim Stouraitis
Galilaios
SCT
SXVF-H9 Starlight-Xpress / R / 60.0
2019-07-23 -1.8 ± 0.9 Yves Jongen
Rasteau Observatory
Plane Wave CDK 17"
SBIG STXL 11002 / Clear / 120.0
2019-01-20 -2.3 ± 1.2 Yves Jongen
Rasteau Observatory
Plane Wave CDK 17"
SBIG STXL 11002 / Clear / 120.0
2019-01-02 0.4 ± 1.6 Yves Jongen
Rasteau Observatory
Plane Wave CDK 17"
SBIG STXL 11002 / Clear / 120.0
2018-12-24 0.6 ± 0.9 Yves Jongen
Rasteau Observatory
Plane Wave CDK 17"
SBIG STXL 11002 / Clear / 120.0
2018-01-24 0.0 ± 0.4 Anaël Wünsche
Observatoire des Baronnies Provençales
Astelco
FLIPL230 / Lum / 120.0
2017-09-05 -1.8 ± 1.7 Marc Deldem
Les Barres Observatory
Celestron C8
SBIG ST8-XME / Clear / 150.0
2016-12-30 1.6 ± 2.0 Claudio Lopresti
Claudio Lopresti
Makutov-Cassegrain
CCD Sbig ST8xme / R / 240.0
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