exoclock

KELT-2Ab (MEDIUM)

Discovered by: Beatty et al. 2012

The Star
Simbad
GAIA
2MASS		 HD 42176
DR2 3438059369839738624
J06103935+3057258
RA 06:10:39.3452 DEC +30:57:25.717
Parallax
7.431 mas		 P.M. RA
16.74 mas/y		 P.M. DEC
-2.405 mas/y
MagV
8.71		 MagR*
8.388		 MagI*
8.12		 MagJ
7.669		 MagH
7.417		 MagK
7.346
MagG
8.584		 MagGBP
8.861		 MagGRP
8.178
*Calculated from GAIA magnitudes.

Ephemeris - Verified True
Kokori et al. 2025
Mid-time
2459734.594402 ± 8e-05 BJDTDB
Period
4.11377574 ± 6.8e-07 days
Transit Parameters
Beatty et al. 2012
Rp/Rs
0.0722 ± 0.0018		 a/Rs**
6.59 +0.08 -0.08
 i
88.6 +1.0 -1.4 deg
e
-		 ω
- deg
DepthR*
6.86 mmag		 Duration*
5.08 hours
*Calculated from the other parameters, using PyLightcurve.
**Adjusted based on the space observations.

Limb Darkening Parameters
Beatty et al. 2012
Teff
6148.0 +48.0 -48.0 K
 Log(g)
4.03 +0.03 -0.03 cm/s2
 Fe/H
0.03 +0.08 -0.08 dex
ExoClock Status
Observing Priority MEDIUM
Minimum aperture 5.0"
Total Observations (Recent) 32 (1)
O-C -0.81 ± 0.78 minutes
ExoClock Observations (Recent) 8 (1)
Space Observations (Recent) 23 (0)
ETD Observations (Recent) 0 (0)
Literature Mid-times (Recent) 1 (0)
Kepler Rp/Rs -
TESS Rp/Rs 0.067218 ± 9.5e-05

KELT-2Ab


ExoClock Observations
Planet
Observation Date		 Observer
Observatory		 Telescope
Camera / Filter / Exp [s]		 O-C
minutes
KELT-2Ab (MEDIUM)
2025-11-18		Simon Dawes
William James II		Celestron Edge11 HD
Risingcam Monochrome SONY imx571 / R / 56.0		0.93 ± 2.16
KELT-2Ab (MEDIUM)
2024-12-28		Ramon Naves
Montcabrer		Meade LX200 12" ACF
Moravian G4-9000 / ipr / 120.0		-0.94 ± 0.98
KELT-2Ab (MEDIUM)
2024-12-28		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / R / 15.0		-1.97 ± 1.87
KELT-2Ab (MEDIUM)
2024-12-23		Claudio Lopresti
Claudio Lopresti		Mak-Newton
CCD Sbig ST10xme / I / 150.0		0.3 ± 3.31
KELT-2Ab (MEDIUM)
2024-02-02		Claudio Lopresti
Claudio Lopresti		Meade LX200 12"
CCD Sbig ST9xe / I / 90.0		-0.16 ± 7.49
KELT-2Ab (MEDIUM)
2021-11-30		Alessandro Marchini
Astronomical Observatory University of Siena		Mak-Cas 0.3m f/5.6
Sbig STL-6303 / R / 90.0		1.45 ± 2.59
KELT-2Ab (MEDIUM)
2021-11-30		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / R / 15.0		1.31 ± 2.88
KELT-2Ab (MEDIUM)
2021-11-18		Taewoo Kim
Deokheung Optical Astronomy Observatory		NYSC 1m Telescope
FLI PL-16803 or PI SOPHIA-2048B / B / 30.0		1.06 ± 1.58

Space Observations
Planet
Observation Date		 Mission O-C
minutes
KELT-2Ab (MEDIUM)
2023-12-03		TESS-0.35 ± 0.55
KELT-2Ab (MEDIUM)
2023-11-29		TESS1.2 ± 0.52
KELT-2Ab (MEDIUM)
2023-11-20		TESS-0.59 ± 0.56
KELT-2Ab (MEDIUM)
2023-11-16		TESS-0.8 ± 0.58
KELT-2Ab (MEDIUM)
2023-11-08		TESS0.62 ± 0.52
KELT-2Ab (MEDIUM)
2023-11-04		TESS1.13 ± 0.73
KELT-2Ab (MEDIUM)
2023-10-27		TESS0.12 ± 0.48
KELT-2Ab (MEDIUM)
2023-10-18		TESS-0.72 ± 0.49
KELT-2Ab (MEDIUM)
2021-11-30		TESS0.08 ± 0.6
KELT-2Ab (MEDIUM)
2021-11-26		TESS-0.11 ± 0.58
KELT-2Ab (MEDIUM)
2021-11-22		TESS0.16 ± 0.49
KELT-2Ab (MEDIUM)
2021-11-18		TESS-0.69 ± 0.66
KELT-2Ab (MEDIUM)
2021-11-14		TESS0.93 ± 0.52
KELT-2Ab (MEDIUM)
2021-11-10		TESS-0.01 ± 0.59
KELT-2Ab (MEDIUM)
2021-11-02		TESS0.15 ± 0.55
KELT-2Ab (MEDIUM)
2021-10-29		TESS-0.54 ± 0.58
KELT-2Ab (MEDIUM)
2021-10-20		TESS0.09 ± 0.45
KELT-2Ab (MEDIUM)
2021-10-08		TESS-0.91 ± 0.53
KELT-2Ab (MEDIUM)
2021-10-04		TESS0.8 ± 0.53
KELT-2Ab (MEDIUM)
2021-09-30		TESS0.03 ± 0.52
KELT-2Ab (MEDIUM)
2021-09-26		TESS-0.1 ± 0.5
KELT-2Ab (MEDIUM)
2021-09-22		TESS0.03 ± 0.48
KELT-2Ab (MEDIUM)
2021-09-17		TESS-0.71 ± 0.5

Literature Mid-times
Planet
Observation Date		 Reference O-C
minutes
2012-02-17 Beatty et al. 2012 0.34 ± 1.22
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