exoclock

HAT-P-1b (LOW)

Discovered by: Bakos et al. 2007

The Star
Simbad
GAIA
2MASS		 BD+37 4734B
DR2 1928431764627661440
J22574684+3840302
RA 22:57:46.8443 DEC +38:40:30.355
Parallax
6.262 mas		 P.M. RA
32.384 mas/y		 P.M. DEC
-41.751 mas/y
MagV
9.87		 MagR
10.02		 MagI
9.7		 MagJ
9.156		 MagH
8.923		 MagK
8.858
MagG
10.179		 MagGBP
10.51		 MagGRP
9.714
*Calculated from GAIA magnitudes.

Ephemeris - Verified True
Kokori et al. 2025
Mid-time
2457145.830165 ± 6.8e-05 BJDTDB
Period
4.46530059 ± 4.3e-07 days
Transit Parameters
Nikolov et al. 2014
Rp/Rs
0.11802 ± 0.00018		 a/Rs
9.85 +0.07 -0.07
 i
85.63 +0.06 -0.06 deg
e
-		 ω
- deg
DepthR*
15.23 mmag		 Duration*
2.88 hours
*Calculated from the other parameters, using PyLightcurve.
**Adjusted based on the space observations.

Limb Darkening Parameters
Torres et al. 2008
Teff
5975.0 +120.0 -120.0 K
 Log(g)
4.38 +0.03 -0.03 cm/s2
 Fe/H
0.13 +0.08 -0.08 dex
ExoClock Status
Observing Priority LOW
Minimum aperture 5.0"
Total Observations (Recent) 48 (4)
O-C -2.88 ± 0.34 minutes
ExoClock Observations (Recent) 26 (4)
Space Observations (Recent) 5 (0)
ETD Observations (Recent) 3 (0)
Literature Mid-times (Recent) 14 (0)
Kepler Rp/Rs -
TESS Rp/Rs 0.11865 ± 0.00068

HAT-P-1b


ExoClock Observations
Planet
Observation Date		 Observer
Observatory		 Telescope
Camera / Filter / Exp [s]		 O-C
minutes
HAT-P-1b (LOW)
2025-11-28		Tommaso Dittadi
TD-TRO		Ritchey-Chretien
Moravian G2-1600 / R / 60.0		-2.23 ± 1.11
HAT-P-1b (LOW)
2025-11-28		Irene Parenti
Osservatorio polifunzionale del Chianti		Marcon 80cm
Moravian G4-KAF09000 / R / 15.0		-2.9 ± 0.56
HAT-P-1b (LOW)
2025-09-04		Miguel Ángel Álava Amat
Sarriguren		Meade SC 8"
Asi 1600 MM / rpr / 120.0		-4.14 ± 1.24
HAT-P-1b (LOW)
2025-06-29		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / R / 45.0		-8.07 ± 1.37
HAT-P-1b (LOW)
2024-10-31		Jacques Michelet
Claix		GSO Ritchey-Chrétien
Poseidon-M Pro / rpr / 20.0		3.13 ± 1.44
HAT-P-1b (LOW)
2024-09-12		Yen-Hsing Lin
Starry House Observatory		Mewlon 300 CRS
ASI 6200MM Pro / R / 60.0		-5.35 ± 4.75
HAT-P-1b (LOW)
2024-08-25		Michael Nezel
Celle Observatory		CDK 14
QHY 268M / V / 45.0		-3.84 ± 1.05
HAT-P-1b (LOW)
2024-08-16		Miguel Ángel Álava Amat
Sarriguren		Meade SC 8"
Asi 1600 MM / rpr / 120.0		-2.14 ± 1.22
HAT-P-1b (LOW)
2024-08-08		Enrique Arce
Vallbona Observatory		Ritchey Chretien
ZWO ASI 294 MM PRO / Lum / 30.0		-2.65 ± 1.02
HAT-P-1b (LOW)
2024-08-08		Ian Sharp
PixelSkies		Celestron C11 Edge HD
Starlight Xpress Trius Pro SX694 / R / 45.0		-4.34 ± 2.02
HAT-P-1b (LOW)
2024-07-16		Yen-Hsing Lin
NTHU Observatory		Showa 10"
ASI6200MM Pro / R / 30.0		0.99 ± 2.16
HAT-P-1b (LOW)
2023-07-12		David Quiles
David Quiles Observatory		Celestron EDGEHD 800
Omegon veTEC 571M / R / 90.0		-1.56 ± 1.24
HAT-P-1b (LOW)
2022-11-21		Kevin Johnson
Holbrook Observatory		Meade LX10 EMC
Atik 383L+ / R / 180.0		0.1 ± 1.87
HAT-P-1b (LOW)
2022-07-01		Kevin Johnson
Holbrook Observatory		Meade LX10 EMC
Atik 383L+ / R / 45.0		-0.3 ± 2.02
HAT-P-1b (LOW)
2022-07-01		Patrick Brandebourg
Patrick Brandebourg (Observatoire du Guernet)		RC 250
Asi294MM Pro / R / 30.0		-0.59 ± 3.46
HAT-P-1b (LOW)
2021-11-02		Martin Crow
Burnham Observatory		Celestron C9.25
SX694 mono / R / 20.0		-5.87 ± 4.32
HAT-P-1b (LOW)
2021-10-24		Jacques Michelet
Claix		GSO Ritchey-Chrétien
QSI-632 / R / 30.0		-1.55 ± 1.01
HAT-P-1b (LOW)
2021-10-24		Robert Roth
TURMX Observatory		CFF Telescopes 160mm APO
ZWO ASI6200MM Pro / rpr / 60.0		-2.42 ± 1.01
HAT-P-1b (LOW)
2021-10-24		Bernhard Wenzel
Vienna Little Telescope - Department of Astrophysics		Cassegrain A=80 cm F=6,64 m
FLI Proline PL16803 / V / 15.0		-3.86 ± 0.86
HAT-P-1b (LOW)
2020-10-05		Harri Kiiskinen
Hankasalmi observatory		RCOS Carbon Tube Ritchey-Chrétien Telescope
SBIG STX-16803 / R / 15.0		0.11 ± 3.02
HAT-P-1b (LOW)
2020-07-22		Martin Smith
Heathwood Road		Skywatcher 120mm ED Apochromatic
Atik 414 ex / R / 12.0		-3.62 ± 4.32
HAT-P-1b (LOW)
2020-07-22		Pierros Papadeas
Archodiko Avias		Celestron EdgeHD 9.25
ASI183MM-Pro / Lum / 10.0		-4.2 ± 2.02
HAT-P-1b (LOW)
2019-12-02		Martin Crow
Burnham Observatory		Celestron C9.25
SX694 mono / R / 20.0		-3.29 ± 2.16
HAT-P-1b (LOW)
2019-09-08		Anaël Wünsche
Observatoire des Baronnies Provençales		CDK Planewave
SBIG STL11K / B / 60.0		0.18 ± 2.16
HAT-P-1b (LOW)
2017-09-28		Anaël Wünsche
Observatoire des Baronnies Provençales		Astelco
FLIPL230 / V / 30.0		-2.28 ± 0.43
HAT-P-1b (LOW)
2016-07-04		Anaël Wünsche
Observatoire des Baronnies Provençales		CDK Planewave
SBIG STL11K / Clear / 60.0		-2.91 ± 5.76

Space Observations
Planet
Observation Date		 Mission O-C
minutes
HAT-P-1b (LOW)
2022-09-29		TESS-1.05 ± 0.78
HAT-P-1b (LOW)
2022-09-24		TESS-1.36 ± 0.66
HAT-P-1b (LOW)
2022-09-20		TESS-0.39 ± 0.95
HAT-P-1b (LOW)
2022-09-11		TESS0.69 ± 0.94
HAT-P-1b (LOW)
2022-09-06		TESS-0.69 ± 0.89

ETD Observations
Planet
Observation Date		 Observer(s) ETD link O-C
minutes
HAT-P-1b (LOW)
2022-07-01		Gianluca Rossi1656869547-3.62 ± 2.45
HAT-P-1b (LOW)
2021-08-18		Fran Campos16294782992.41 ± 1.18
HAT-P-1b (LOW)
2013-11-09		Mark Salisbury1384202364-0.13 ± 1.44

Literature Mid-times
Planet
Observation Date		 Reference O-C
minutes
2016-07-27 Chen et al. 2022 -1.27 ± 0.23
2015-11-02 Todorov et al. 2019 0.24 ± 0.05
2012-11-12 Todorov et al. 2019 -0.52 ± 0.11
2012-10-03 Turner et al. 2016 -2.75 ± 1.37
2012-09-15 Chen et al. 2022 -0.05 ± 0.22
2007-10-08 Johnson et al. 2008 0.2 ± 1.8
2007-09-20 Johnson et al. 2008 -1.62 ± 1.31
2006-11-29 Winn et al. 2007 0.92 ± 4.18
2006-10-02 Winn et al. 2007 -0.03 ± 1.54
2006-09-28 Winn et al. 2007 0.26 ± 0.85
2006-09-19 Winn et al. 2007 1.44 ± 0.68
2006-09-19 Winn et al. 2007 -0.69 ± 0.78
2006-09-10 Winn et al. 2007 0.15 ± 1.09
2006-09-01 Winn et al. 2007 -4.01 ± 0.99
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