exoclock

HATS-57b (MEDIUM)

Discovered by: Espinoza et al. 2019

The Star
Simbad
GAIA
2MASS		 HATS-57
DR2 5094406193214399616
J04034760-1903242
RA 04:03:47.6005 DEC -19:03:24.326
Parallax
3.55 mas		 P.M. RA
-12.664 mas/y		 P.M. DEC
-14.115 mas/y
MagV
11.59		 MagR*
11.948		 MagI*
10.806		 MagJ
11.071		 MagH
10.738		 MagK
10.707
MagG
12.182		 MagGBP
12.562		 MagGRP
11.654
*Calculated from GAIA magnitudes.

Ephemeris - Verified True
Kokori et al. 2025
Mid-time
2459019.62252 ± 0.00017 BJDTDB
Period
2.35061734 ± 4.6e-07 days
Transit Parameters
Espinoza et al. 2019
Rp/Rs
0.1218 ± 0.0023		 a/Rs
7.82 +0.12 -0.12
 i
87.88 +0.4 -0.4 deg
e
-		 ω
- deg
DepthR*
19.58 mmag		 Duration*
2.5 hours
*Calculated from the other parameters, using PyLightcurve.
**Adjusted based on the space observations.

Limb Darkening Parameters
Espinoza et al. 2019
Teff
5587.0 +19.0 -19.0 K
 Log(g)
4.48 +0.02 -0.02 cm/s2
 Fe/H
0.268 +0.043 -0.043 dex
ExoClock Status
Observing Priority MEDIUM
Minimum aperture 5.62"
Total Observations (Recent) 23 (2)
O-C 0.96 ± 0.39 minutes
ExoClock Observations (Recent) 13 (2)
Space Observations (Recent) 9 (0)
ETD Observations (Recent) 0 (0)
Literature Mid-times (Recent) 1 (0)
Kepler Rp/Rs -
TESS Rp/Rs 0.12061 ± 0.00066

HATS-57b


ExoClock Observations
Planet
Observation Date		 Observer
Observatory		 Telescope
Camera / Filter / Exp [s]		 O-C
minutes
HATS-57b (MEDIUM)
2025-12-08		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / Lum / 100.0		1.76 ± 0.6
HATS-57b (MEDIUM)
2025-12-08		Jean-Pascal Vignes
Deep Sky Chile		Planewave CDK400
QHYCCD 600M / R / 50.0		-0.27 ± 0.71
HATS-57b (MEDIUM)
2024-12-18		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / Lum / 100.0		-0.49 ± 1.44
HATS-57b (MEDIUM)
2024-11-22		Bryan Martin
Tiger Butte Observatory Remote		AG Optical IDK
ZWO ASI 294 / Lum / 180.0		0.5 ± 4.03
HATS-57b (MEDIUM)
2024-11-08		Jean-Pascal Vignes
Deep Sky Chile		PlaneWave CDK 17"
QHYCCD 600 M / V / 60.0		1.71 ± 0.88
HATS-57b (MEDIUM)
2023-12-22		Francois Regembal
HRT Deep Sky Chile		Astrosib RC360
Moravian C3 PRO 61000 / Lum / 130.0		1.14 ± 1.09
HATS-57b (MEDIUM)
2023-11-23		Gerard Tartalo
Dark Energy Observatory		Ts Photoline triplet apo 115/800 F7
Qhy294M pro / R / 120.0		-0.81 ± 5.47
HATS-57b (MEDIUM)
2023-10-10		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / Lum / 120.0		1.1 ± 0.73
HATS-57b (MEDIUM)
2023-10-10		Francois Regembal
HRT Deep Sky Chile		Astrosib RC360
Moravian C3 PRO 61000 / Lum / 135.0		-0.19 ± 2.02
HATS-57b (MEDIUM)
2023-01-27		Anaël Wünsche
El Sauce Observatory		CDK Planewave Chili
Moravian G4 16k / R / 120.0		2.1 ± 1.73
HATS-57b (MEDIUM)
2022-11-22		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / Lum / 120.0		-1.54 ± 0.59
HATS-57b (MEDIUM)
2022-01-23		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / R / 120.0		0.83 ± 1.01
HATS-57b (MEDIUM)
2021-12-28		Yves Jongen
Deep Sky Chile		Plane Wave CDK 17"
Moravian 4G / R / 120.0		2.12 ± 1.01

Space Observations
Planet
Observation Date		 Mission O-C
minutes
HATS-57b (MEDIUM)
2020-11-14		TESS-0.49 ± 0.85
HATS-57b (MEDIUM)
2020-11-11		TESS-2.08 ± 0.98
HATS-57b (MEDIUM)
2020-11-09		TESS0.69 ± 0.91
HATS-57b (MEDIUM)
2020-11-07		TESS-0.39 ± 0.65
HATS-57b (MEDIUM)
2020-11-02		TESS0.87 ± 0.78
HATS-57b (MEDIUM)
2020-10-31		TESS-0.11 ± 0.73
HATS-57b (MEDIUM)
2020-10-28		TESS0.7 ± 0.85
HATS-57b (MEDIUM)
2020-10-26		TESS0.44 ± 0.84
HATS-57b (MEDIUM)
2020-10-24		TESS-1.82 ± 0.79

Literature Mid-times
Planet
Observation Date		 Reference O-C
minutes
2017-01-24 Espinoza et al. 2019 0.18 ± 0.36
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