exoclock

WASP-21b

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. 2021
Mid-time
2457660.73516 ± 0.00016 BJDTDB
Period
4.3225038 ± 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 to produce a duration that matches the 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
ExoClock Observations (Recent)
Space Observations
Literature Mid-times
ETD Observations
O-C minutes
MEDIUM
6 (1)

10

0.7±0.6

WASP-21b


ExoClock Observations

Observation
Date
Observer
Observatory
Telescope
Camera / Filter / Exp [s]
O-C
minutes
2021-09-23 Yves Jongen
Rasteau Observatory
Plane Wave CDK 17"
SBIG STXL 11002 / R / 120.0
0.2 ± 1.0
2020-10-07 Anaël Wünsche
Observatoire des Baronnies Provençales
CDK Planewave
SBIG STL11K / Clear / 120.0
-1.1 ± 1.2 - Data available
2020-08-29 Nikolaos Paschalis
Nunki Observatory
Officina Stellare RILA 400
SBIG STXL 11002 / R / 60.0
1.8 ± 1.7 - Data available
2020-08-17 Francois Regembal
HRTobs
Astrosib RC360
SBIG STX 16803 / Lum / 120.0
-3.2 ± 2.3 - Data available
2020-08-04 Yves Jongen
Rasteau Observatory
Plane Wave CDK 17"
SBIG STXL 11002 / R / 120.0
4.3 ± 1.4
2016-10-20 Anaël Wünsche
Observatoire des Baronnies Provençales
CDK Planewave
SBIG STL11K / Clear / 120.0
1.0 ± 1.6 - Data available


Literature Mid-times

Observation
Date
Mid-time Time format Reference O-C
minutes
2018-09-21 2458382.59276 ± 0.00031 BJD_UTC Alderson et al. 2020 0.4 ± 0.4
2017-09-22 2458019.50152 ± 0.0003 BJD_UTC Alderson et al. 2020 -1.0 ± 0.4
2017-09-10 2458006.53493 ± 0.00023 BJD_UTC Alderson et al. 2020 0.4 ± 0.3
2013-09-22 2456558.49648 ± 0.00073 BJD_TDB Seeliger et al. 2015 -0.3 ± 1.1
2012-09-11 2456182.43986 ± 0.00079 BJD_TDB Ciceri et al. 2013 1.4 ± 1.1
2012-09-11 2456182.43915 ± 0.00036 BJD_TDB Ciceri et al. 2013 0.4 ± 0.5
2012-09-11 2456182.43874 ± 0.00071 BJD_TDB Chen et al. 2020 -0.2 ± 1.0
2012-08-16 2456156.5026 ± 0.00115 BJD_TDB Seeliger et al. 2015 -1.8 ± 1.7
2011-08-24 2455797.734 ± 0.00112 BJD_TDB Seeliger et al. 2015 -2.9 ± 1.6
2008-10-03 2454743.0419 ± 0.0022 HJD_UTC Bouchy et al. 2010 -3.6 ± 3.2
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