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. 2021
Mid-time
2458767.93317 ± 0.00014 BJDTDB
Period
1.8053646 ± 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.
**Adjusted to produce a duration that matches the 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
ExoClock Observations (Recent)
Space Observations
Literature Mid-times
ETD Observations
O-C minutes 		LOW
49 (20)

2

-0.09±0.13

Qatar-4b


ExoClock Observations

Observation
Date		 Observer
Observatory		 Telescope
Camera / Filter / Exp [s]		 O-C
minutes
2022-08-09 David Molina
Anunaki Observatory Z51		 Schmidt Cassegrain
SBIG ST-9xe / Clear / 120.0		 -0.0 ± 0.9
2022-08-09 Kevin Hills
Tacande		 ASA 0.5m f/3.6 astrograph.
QHY 600M with IMX 455 chip / R / 60.0		 -0.2 ± 0.9
2022-08-01 Claudio Lopresti
Claudio Lopresti		 Mak-Newton
CCD Sbig ST10xme / Lum / 180.0		 2.5 ± 4.3
2022-07-03 Eric Miny
BLOIS SOLOGNE ASTRONOMIE OBSERVATORY		 Newton T305
QSI 683WS / Lum / 180.0		 -1.8 ± 2.6
2022-01-27 Ian Sharp
Ham Observatory		 Celestron C9.25 Edge HD
Starlight Xpress Trius Pro SX694 / R / 120.0		 -4.9 ± 2.2
2021-12-13 Francesco Scaggiante
Gruppo Astrofili Salese "GALILEO GALILEI"		 NEWTON 410/1710
Custom made with KAF-1603ME CCD sensor / R / 120.0		 2.6 ± 1.7
2021-12-13 Yves Jongen
Rasteau Observatory		 Plane Wave CDK 17"
SBIG STXL 11002 / Lum / 120.0		 0.0 ± 0.7
2021-12-13 Dominique DANIEL
La Montjoie		 Celestron CGX C8 XLT
Camera CMOS ZWO ASI294MC pro (color) / Clear / 240.0		 -2.7 ± 3.5
2021-12-11 Aziz Ettahar Kaeouach
High Atlas Observatory		 PlaneWave CDK 12.5
Zwo asi 294 mm pro / Lum / 120.0		 1.0 ± 1.3
2021-11-23 Stephen Futcher
Hampshire Astronomical Group, Clanfield		 Ritchey-Chrétien (SX-46)
Starlight Xpress SX-46 / R / 120.0		 0.3 ± 0.9
2021-11-05 Valère Perroud
Observatoire de Duines		 RC 10
Moravian G2-4000 / Lum / 180.0		 -3.9 ± 1.9
2021-10-29 Taewoo Kim
Deokheung Optical Astronomy Observatory		 NYSC 1m Telescope
FLI PL-16803 or PI SOPHIA-2048B / R / 180.0		 -1.4 ± 1.0
2021-10-27 Thomas Mollier
Tomastro		 Newtonian
ZWO ASI1600MMC / Clear / 120.0		 0.1 ± 1.3
2021-10-27 Jacques Michelet
Claix		 GSO Ritchey-Chrétien
QSI-632 / Clear / 180.0		 -0.9 ± 1.4
2021-10-27 Didier Laloum
Observatoire Privé du Mont (OPM)		 RC 8 GSO
Atik 383L+ / Astrodon ExoPlanet-BB / 150.0		 -2.5 ± 1.3
2021-10-26 Robert Roth
TURMX Observatory		 CFF Telescopes 160mm APO
ZWO ASI6200MM Pro / Lum / 120.0		 -1.7 ± 1.2
2021-10-18 Claudio Lopresti
Claudio Lopresti		 Meade LX200 12"
CCD Sbig ST9xe / Lum / 180.0		 -1.1 ± 3.5
2021-10-17 Giorgio Baj
M57		 Ritchey-Chretien
Sbig STT1603 ME / Clear / 180.0		 1.3 ± 2.0
2021-10-17 Yves Jongen
Rasteau Observatory		 Plane Wave CDK 17"
SBIG STXL 11002 / Lum / 120.0		 -2.3 ± 0.6
2021-08-31 Kevin Hills
Tacande		 ASA 0.5m f/3.6 astrograph.
QHY 600M with IMX 455 chip / R / 90.0		 -0.9 ± 0.9
2021-07-16 Dim Stouraitis
Galilaios		 SCT
SXVF-H9 Starlight-Xpress / R / 90.0		 0.5 ± 1.6
2020-12-24 John Savage
Z42 Rushay Farm Observatory		 Celestron 14Edge
ZWO ASI6200MM / R / 180.0		 1.7 ± 1.3 - Data available
2020-11-18 Yves Jongen
Rasteau Observatory		 Plane Wave CDK 17"
SBIG STXL 11002 / Lum / 120.0		 -1.2 ± 0.9 - Data available
2020-11-07 Lorenzo Betti
Osservatorio Polifunzionale del Chianti		 Ritchey-Chretien
Moravian G4 - KAF 09000 / V / 90.0		 -1.8 ± 0.6 - Data available
2020-11-02 Taewoo Kim
Deokheung Optical Astronomy Observatory		 NYSC 1m Telescope
FLI PL-16803 or PI SOPHIA-2048B / R / 120.0		 -2.0 ± 0.6 - Data available
2020-09-13 Manfred Raetz
privat observatory Herges-Hallenberg		 SCT 280 /1790 (Celestron C11 with reducer)
Moravian Instruments G2-1600 / Clear / 120.0		 -0.4 ± 1.0 - Data available
2020-08-25 Anaël Wünsche
Observatoire des Baronnies Provençales		 Astelco2
ZWO ASI6200 / Clear / 120.0		 0.9 ± 0.4 - Data available
2020-08-25 Alberto Tomatis
Alto-Observatory		 RC
STL 6303 / Lum / 240.0		 -0.3 ± 0.7 - Data available
2020-08-25 Vojtěch Školník
Hvezdarna Valasske Mezirici		 Meade LX90 ACF
Meade DSI II / Clear / 180.0		 -0.4 ± 1.0 - Data available
2020-08-25 Yves Jongen
Rasteau Observatory		 Plane Wave CDK 17"
SBIG STXL 11002 / Clear / 120.0		 -0.6 ± 0.9 - Data available
2020-07-28 Francois Regembal
HRTobs		 Astrosib RC360
SBIG STX 16803 / Lum / 60.0		 -0.5 ± 1.3 - Data available
2020-07-10 Yves Jongen
Rasteau Observatory		 Plane Wave CDK 17"
SBIG STXL 11002 / Clear / 120.0		 3.1 ± 1.2 - Data available
2020-07-10 Marc Bretton
Observatoire des Baronnies Provençales		 Astelco 800mm
ZWO ASI6200 / Clear / 120.0		 -0.6 ± 0.7 - Data available
2020-01-07 Yves Jongen
Rasteau Observatory		 Plane Wave CDK 17"
SBIG STXL 11002 / Clear / 120.0		 -0.5 ± 1.9 - Data available
2019-11-21 Ferran Grau Horta
Ca L'Ou		 Meade ACF 16''
FLI Proline PL1001 / Clear / 300.0		 -0.2 ± 1.9
2019-11-12 Yves Jongen
Rasteau Observatory		 Plane Wave CDK 17"
SBIG STXL 11002 / Clear / 120.0		 -0.3 ± 1.4 - Data available
2019-10-16 Mario Morales Aimar
Observatorio de Sencelles MPC K14		 10" Meade Schmidt Cassegrain
SBIG ST7-XME / Clear / 500.0		 3.4 ± 1.3
2019-10-07 Yves Jongen
Rasteau Observatory		 Plane Wave CDK 17"
SBIG STXL 11002 / Clear / 120.0		 -0.3 ± 1.2 - Data available
2019-10-06 Anaël Wünsche
Observatoire des Baronnies Provençales		 Astelco
FLIPL230 / Clear / 120.0		 2.2 ± 0.4 - Data available
2019-10-06 Yves Jongen
Rasteau Observatory		 Plane Wave CDK 17"
SBIG STXL 11002 / Clear / 120.0		 -0.4 ± 0.7 - Data available
2019-09-17 Yves Jongen
Rasteau Observatory		 Plane Wave CDK 17"
SBIG STXL 11002 / Clear / 120.0		 -2.1 ± 1.2 - Data available
2019-08-21 Dim Stouraitis
Galilaios		 SCT
SXVF-H9 Starlight-Xpress / R / 60.0		 -1.0 ± 1.3 - Data available
2019-07-23 Yves Jongen
Rasteau Observatory		 Plane Wave CDK 17"
SBIG STXL 11002 / Clear / 120.0		 -3.2 ± 1.0 - Data available
2019-01-20 Yves Jongen
Rasteau Observatory		 Plane Wave CDK 17"
SBIG STXL 11002 / Clear / 120.0		 -0.5 ± 1.2 - Data available
2019-01-02 Yves Jongen
Rasteau Observatory		 Plane Wave CDK 17"
SBIG STXL 11002 / Clear / 120.0		 2.2 ± 1.6 - Data available
2018-12-24 Yves Jongen
Rasteau Observatory		 Plane Wave CDK 17"
SBIG STXL 11002 / Clear / 120.0		 2.3 ± 0.9 - Data available
2018-01-24 Anaël Wünsche
Observatoire des Baronnies Provençales		 Astelco
FLIPL230 / Lum / 120.0		 0.3 ± 0.4 - Data available
2017-09-05 Marc Deldem
Les Barres Observatory		 Celestron C8
SBIG ST8-XME / Clear / 150.0		 -2.1 ± 1.7 - Data available
2016-12-30 Claudio Lopresti
Claudio Lopresti		 Makutov-Cassegrain
CCD Sbig ST8xme / R / 240.0		 0.2 ± 2.0 - Data available


Literature Mid-times

Observation
Date		 Mid-time Time format Reference O-C
minutes
2018-07-17 2458316.59101 ± 0.00103 BJD_TDB Mallonn et al. 2019 -1.5 ± 1.5
2016-09-06 2457637.77361 ± 0.00046 BJD_TDB Alsubai et al. 2017 -1.9 ± 0.7
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