exoclock

KELT-21b (MEDIUM)

Discovered by: Johnson et al. 2018

The Star
Simbad
GAIA
2MASS
HD 332124
DR2 2054523105274216704
J20191200+3234517
RA 20:19:12.0049 DEC +32:34:51.762
Parallax
2.095 mas
P.M. RA
2.239 mas/y
P.M. DEC
-0.113 mas/y
MagV
10.48
MagR*
10.453
MagI*
10.24
MagJ
10.149
MagH
10.121
MagK
10.09
MagG
10.541
MagGBP
10.642
MagGRP
10.381
*Calculated from GAIA magnitudes.

Ephemeris - Verified True
Kokori et al. 2022
Mid-time
2458881.93965 ± 0.00023 BJDTDB
Period
3.61276958 ± 9.5e-07 days

Transit Parameters
Johnson et al. 2018
Rp/Rs
0.09952 ± 0.00071
a/Rs
6.86 +0.13 -0.12
i
86.46 +0.38 -0.34 deg
e
-
ω
- deg
DepthR*
12.2 mmag
Duration*
4.11 hours
*Calculated from the other parameters, using PyLightcurve.
**Adjusted based on the space observations.

Limb Darkening Parameters
Johnson et al. 2018
Teff
7598.0 +81.0 -84.0 K
Log(g)
4.173 +0.015 -0.014 cm/s2
Fe/H
-0.405 +0.032 -0.033 dex
ExoClock Status
Observing Priority MEDIUM
Minimum aperture 5.0"
Total Observations (Recent) 26 (2)
O-C 1.94 ± 0.45 minutes
ExoClock Observations (Recent) 10 (2)
Space Observations (Recent) 8 (0)
ETD Observations (Recent) 0 (0)
Literature Mid-times (Recent) 8 (0)
Kepler Rp/Rs -
TESS Rp/Rs 0.09957 ± 0.00037

KELT-21b


ExoClock Observations

Planet
Observation Date
Observer
Observatory
Telescope
Camera / Filter / Exp [s]
O-C
minutes
KELT-21b (MEDIUM)
2024-06-10
Deborah Smith
Complejo Astronomico Los Coloraos, Gorafe
Celestron C11 EdgeHD
ASI2600MM / R / 120.0
-3.12 ± 2.59
KELT-21b (MEDIUM)
2023-06-22
Guillaume Biesse
Observatoire de la colline Tossius
Ritchey Chretien GSO
ASI 533 MM - Gain=0 / rpr / 180.0
2.96 ± 3.17
KELT-21b (MEDIUM)
2022-10-04
Adam Popowicz
Observatory Pyskowice
RC12" GSO
ASI ZWO 1600 MM / ATIK 11000M / R / 60.0
1.1 ± 2.3
KELT-21b (MEDIUM)
2022-07-21
Jean-Baptiste Marquette
MrKite47
Newton Sky-Watcher 200/1000
ZWO ASI183MM Pro / R / 70.0
5.08 ± 2.02
KELT-21b (MEDIUM)
2022-07-21
Marianna Michelagnoli
Osservatorio Polifunzionale del Chianti
Ritchey-Chretien
Moravian G4-9000 / V / 40.0
1.76 ± 0.58
KELT-21b (MEDIUM)
2022-07-21
Yves Jongen
Rasteau Observatory
Plane Wave CDK 17"
SBIG STXL 11002 / R / 90.0
1.04 ± 2.02
KELT-21b (MEDIUM)
2022-07-02
Fran Campos
Puig d'Agulles Observtory
RC14" on EQ8 German mount
SBIG ST-8XME / R / 90.0
6.3 ± 1.73
KELT-21b (MEDIUM)
2022-07-02
Thomas SALOMON
Astroqueyras
Ritchey chretien 500 F/8
160803 / R / 60.0
2.84 ± 1.44
KELT-21b (MEDIUM)
2022-07-02
Claudio Lopresti
Claudio Lopresti
Meade LX200 12"
CCD Sbig ST9xe / Lum / 180.0
-0.33 ± 2.45
KELT-21b (MEDIUM)
2022-07-02
Claudio Lopresti
Claudio Lopresti
Mak-Newton
CCD Sbig ST10xme / I / 180.0
-3.5 ± 2.74

Space Observations

Planet
Observation Date
Mission O-C
minutes
KELT-21b (MEDIUM)
2021-08-19
TESS0.53 ± 0.69
KELT-21b (MEDIUM)
2021-08-15
TESS-1.13 ± 0.76
KELT-21b (MEDIUM)
2021-08-11
TESS-0.18 ± 0.72
KELT-21b (MEDIUM)
2021-08-08
TESS0.11 ± 0.76
KELT-21b (MEDIUM)
2021-08-04
TESS0.6 ± 0.78
KELT-21b (MEDIUM)
2021-07-31
TESS-0.28 ± 0.79
KELT-21b (MEDIUM)
2021-07-28
TESS1.08 ± 0.72
KELT-21b (MEDIUM)
2021-07-24
TESS-0.49 ± 0.78

Literature Mid-times

Planet
Observation Date
Reference O-C
minutes
2017-05-29 Johnson et al. 2018 0.58 ± 1.15
2017-05-29 Johnson et al. 2018 0.15 ± 0.72
2016-08-24 Johnson et al. 2018 1.24 ± 1.15
2016-08-24 Johnson et al. 2018 -0.2 ± 1.15
2016-08-24 Johnson et al. 2018 -3.8 ± 1.01
2016-07-19 Johnson et al. 2018 -0.78 ± 1.15
2014-10-25 Johnson et al. 2018 5.09 ± 1.44
2014-08-29 Johnson et al. 2018 -1.66 ± 2.88
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