exoclock

KELT-4Ab

Discovered by: Eastman et al. 2016

The Star
Simbad
GAIA
2MASS		 BD+26 2091
DR2 727624020367528576
J10281500+2534236
RA 10:28:15.0111 DEC +25:34:23.474
Parallax
4.558 mas		 P.M. RA
14.098 mas/y		 P.M. DEC
-12.2 mas/y
MagV
9.98		 MagR
9.9		 MagI*
9.4		 MagJ
9.017		 MagH
8.79		 MagK
8.689
MagG
9.957		 MagGBP
10.199		 MagGRP
9.527
*Calculated from GAIA magnitudes.

Ephemeris - Not verified False
Eastman et al. 2016
Mid-time
2456190.3021 ± 0.00022 BJDTDB
Period
2.989593 ± 5e-06 days
Transit Parameters
Eastman et al. 2016
Rp/Rs
0.1089 ± 0.0005		 a/Rs
5.79 +0.09 -0.08
 i
83.16 +0.22 -0.21 deg
e
-		 ω
- deg
DepthR*
13.52 mmag		 Duration*
3.46 hours
*Calculated from the other parameters, using PyLightcurve.
**Adjusted to produce a duration that matches the observations.

Limb Darkening Parameters
Eastman et al. 2016
Teff
6206.0 +75.0 -75.0 K
 Log(g)
4.11 +0.01 -0.01 cm/s2
 Fe/H
-0.12 +0.07 -0.07 dex
ExoClock Status
Observing Priority
ExoClock Observations (Recent)
Space Observations
Literature Mid-times
ETD Observations
O-C minutes 		MEDIUM
13 (2)

0

-9.9±0.5

KELT-4Ab


ExoClock Observations

Observation
Date		 Observer
Observatory		 Telescope
Camera / Filter / Exp [s]		 O-C
minutes
2022-01-06 Alexander Putz
Alex		 William Optics Moravian
G2-8300 Moravian / R / 60.0		 -15.5 ± 7.2
2021-12-02 Martin Crow
Burnham Observatory		 Celestron C9.25
SX694 mono / R / 40.0		 -12.7 ± 3.3
2021-04-24 Fabio Mortari
Hypatia Observatory		 Ritchey Chretienne 250mm f/5.3
Sbig ST8-XE / R / 120.0		 -9.6 ± 2.7
2021-04-03 Martin Smith
Heathwood Road		 Skywatcher 120mm ED Apochromatic
Atik 414 ex / Clear / 6.0		 -7.5 ± 2.2
2021-04-03 John Savage
Z42 Rushay Farm Observatory		 Celestron 14Edge FR
ZWO ASI6200MM / Lum / 10.0		 -9.9 ± 1.0
2021-03-31 Fabio Salvaggio
WBRO - K49		 C9.25"
SBIG ST8-XME / R / 200.0		 -16.6 ± 2.3
2021-03-11 Adam Popowicz
Observatory Pyskowice		 RC12" GSO
ASI ZWO 1600 MM / ATIK 11000M / R / 60.0		 -11.3 ± 2.0
2021-03-08 Fabio Mortari
Hypatia Observatory		 Ritchey Chretienne 250mm f/5.3
Sbig ST8-XE / R / 120.0		 -6.1 ± 4.3
2021-03-08 Nigel Stanbury
Nigel Stanbury		 Skywatcher Esprit 150 ED
ZWO ASI533MC PRO / R / 30.0		 -8.7 ± 2.0
2021-03-02 John Savage
Z42 Rushay Farm Observatory		 Celestron 14Edge FR
ZWO ASI6200MM / r' / 60.0		 -7.7 ± 1.2
2021-02-21 Thomas Mollier
Tomastro		 Newtonian
ZWO ASI1600MMC / Clear / 15.0		 -6.5 ± 3.6
2021-02-21 Yves Jongen
Rasteau Observatory		 Plane Wave CDK 17"
SBIG STXL 11002 / R / 60.0		 -11.1 ± 1.7
2021-01-22 Martin Smith
Heathwood Road		 Skywatcher 120mm ED Apochromatic
Atik 414 ex / Clear / 8.0		 -11.0 ± 1.9
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