exoclock

WASP-21b (LOW)

Discovered by: Bouchy et al. 2010

The Star
Simbad
GAIA
2MASS
WASP-21
DR2 2831084391023184128
J23095825+1823459
RA 23:09:58.2534 DEC +18:23:45.882
Parallax
3.841 mas
P.M. RA
17.597 mas/y
P.M. DEC
18.867 mas/y
MagV
11.55
MagR
11.52
MagI*
10.832
MagJ
10.35
MagH
10.085
MagK
9.982
MagG
11.399
MagGBP
11.744
MagGRP
10.912
*Calculated from GAIA magnitudes.

Ephemeris - Verified True
Kokori et al. 2022
Mid-time
2457738.54027 ± 0.00017 BJDTDB
Period
4.32250416 ± 8e-07 days

Transit Parameters
Bouchy et al. 2010
Rp/Rs
0.104 ± 0.0018
a/Rs
10.54 +0.15 -0.15
i
88.8 +0.8 -0.7 deg
e
-
ω
- deg
DepthR*
14.28 mmag
Duration*
3.4 hours
*Calculated from the other parameters, using PyLightcurve.
**Adjusted based on the space observations.

Limb Darkening Parameters
Bouchy et al. 2010
Teff
5800.0 +100.0 -100.0 K
Log(g)
4.2 +0.1 -0.1 cm/s2
Fe/H
-0.46 +0.11 -0.11 dex
ExoClock Status
Observing Priority LOW
Minimum aperture 5.0"
Total Observations (Recent) 25 (5)
O-C 1.5 ± 0.7 minutes
ExoClock Observations (Recent) 15 (5)
Space Observations (Recent) 0 (0)
ETD Observations (Recent) 0 (0)
Literature Mid-times (Recent) 10 (0)
Kepler Rp/Rs -
TESS Rp/Rs -

WASP-21b


ExoClock Observations

Planet
Observation Date
Observer
Observatory
Telescope
Camera / Filter / Exp [s]
O-C
minutes
WASP-21b (LOW)
2023-10-10
Paolo Arcangelo Matassa
P:M.P.H.R. Deep Sky (K81)
Ritchey Chretien 40cm-F5.3
CCD ICX453AQ / Lum / 60.0
-0.82 ± 3.02
WASP-21b (LOW)
2023-09-06
Bryan Martin
Tiger Butte Observatory Remote
AG Optical IDK
ZWO ASI 294 / Clear / 120.0
5.28 ± 1.73
WASP-21b (LOW)
2023-08-06
Eric Miny
BLOIS SOLOGNE ASTRONOMIE OBSERVATORY
Newton T305
QSI 683WS / Lum / 60.0
-0.44 ± 1.44
WASP-21b (LOW)
2023-07-16
Bryan Martin
Tiger Butte Observatory Remote
AG Optical IDK
ZWO ASI 294 / R / 120.0
-0.55 ± 1.73
WASP-21b (LOW)
2023-07-12
Paolo Arcangelo Matassa
P:M.P.H.R. Deep Sky (K81)
Ritchey Chretien 40cm-F5.3
CCD ICX453AQ / Lum / 60.0
1.61 ± 2.16
WASP-21b (LOW)
2022-12-07
Martin Crow
Burnham Observatory
Celestron C9.25
SX694 mono / R / 120.0
1.34 ± 2.16
WASP-21b (LOW)
2022-08-26
David Arnot
OSO PIRATE
PlaneWave Instruments CDK24 24 inch (610 mm) f/6.5 Corrected Dall-Kirkham Astrograph
FLI ProLine KAF-16803 / R / 45.0
5.37 ± 2.16
WASP-21b (LOW)
2022-08-26
Yves Jongen
Deep Sky Chile
Plane Wave CDK 17"
Moravian 4G / R / 120.0
-0.25 ± 2.88
WASP-21b (LOW)
2021-09-23
Yves Jongen
Rasteau Observatory
Plane Wave CDK 17"
SBIG STXL 11002 / R / 120.0
-0.07 ± 1.01
WASP-21b (LOW)
2020-10-07
Anaël Wünsche
Observatoire des Baronnies Provençales
CDK Planewave
SBIG STL11K / Clear / 120.0
-1.31 ± 1.15
WASP-21b (LOW)
2020-08-29
Nikolaos Paschalis
Nunki Observatory
Officina Stellare RILA 400
SBIG STXL 11002 / R / 60.0
1.62 ± 1.73
WASP-21b (LOW)
2020-08-17
Francois Regembal
HRTobs
Astrosib RC360
SBIG STX 16803 / Lum / 120.0
-3.4 ± 2.3
WASP-21b (LOW)
2020-08-04
Yves Jongen
Rasteau Observatory
Plane Wave CDK 17"
SBIG STXL 11002 / R / 120.0
4.11 ± 1.44
WASP-21b (LOW)
2016-10-20
Anaël Wünsche
Observatoire des Baronnies Provençales
CDK Planewave
SBIG STL11K / Clear / 120.0
0.99 ± 1.58
WASP-21b (LOW)
2013-08-28
Kaushkee Vats
UCLO
Celestron (C14)
SBIG STL6303E / R / 60.0
-5.2 ± 2.59

Literature Mid-times

Planet
Observation Date
Reference O-C
minutes
2018-09-21 Alderson et al. 2020 0.25 ± 0.45
2017-09-22 Alderson et al. 2020 -1.07 ± 0.43
2017-09-10 Alderson et al. 2020 0.29 ± 0.33
2013-09-22 Seeliger et al. 2015 -0.22 ± 1.05
2012-09-11 Ciceri et al. 2013 1.57 ± 1.14
2012-09-11 Ciceri et al. 2013 0.54 ± 0.52
2012-09-11 Chen et al. 2020 -0.05 ± 1.02
2012-08-16 Seeliger et al. 2015 -1.65 ± 1.66
2011-08-24 Seeliger et al. 2015 -2.74 ± 1.61
2008-10-03 Bouchy et al. 2010 -3.29 ± 3.17
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