exoclock

HAT-P-51b (LOW)

Discovered by: Hartman et al. 2015

The Star
Simbad
GAIA
2MASS		 HAT-P-51
DR2 316706322857704960
J01241564+3248387
RA 01:24:15.6413 DEC +32:48:38.777
Parallax
2.244 mas		 P.M. RA
-9.175 mas/y		 P.M. DEC
-16.632 mas/y
MagV
13.44		 MagR*
13.039		 MagI
12.67		 MagJ
12.039		 MagH
11.645		 MagK
11.614
MagG
13.285		 MagGBP
13.713		 MagGRP
12.707
*Calculated from GAIA magnitudes.

Ephemeris - Verified True
Kokori et al. 2025
Mid-time
2458720.71756 ± 0.00022 BJDTDB
Period
4.21802002 ± 7.1e-07 days
Transit Parameters
Hartman et al. 2015
Rp/Rs
0.1278 ± 0.002		 a/Rs
10.5 +0.3 -0.4
 i
88.5 +0.6 -0.6 deg
e
-		 ω
- deg
DepthR*
21.72 mmag		 Duration*
3.36 hours
*Calculated from the other parameters, using PyLightcurve.
**Adjusted based on the space observations.

Limb Darkening Parameters
Hartman et al. 2015
Teff
5449.0 +50.0 -50.0 K
 Log(g)
4.39 +0.03 -0.03 cm/s2
 Fe/H
0.27 +0.08 -0.08 dex
ExoClock Status
Observing Priority LOW
Minimum aperture 8.01"
Total Observations (Recent) 44 (7)
O-C -1.12 ± 0.46 minutes
ExoClock Observations (Recent) 37 (7)
Space Observations (Recent) 6 (0)
ETD Observations (Recent) 0 (0)
Literature Mid-times (Recent) 1 (0)
Kepler Rp/Rs -
TESS Rp/Rs 0.1272 ± 0.0014

HAT-P-51b


ExoClock Observations
Planet
Observation Date		 Observer
Observatory		 Telescope
Camera / Filter / Exp [s]		 O-C
minutes
HAT-P-51b (LOW)
2025-10-11		Lionel Rousselot
Private observatory Vierzon		Newton 250/740
ZWO 533 monochrome / Lum / 180.0		0.06 ± 1.24
HAT-P-51b (LOW)
2025-09-25		Ivo Silvestri
Trevinca Skies		Skywatcher Newton 250pds
ASI2600MM Duo / Lum / 180.0		-0.62 ± 0.94
HAT-P-51b (LOW)
2025-09-04		Mark van der Grijp
Raspay Observatory		C9.25 HD
ZWO2600 MM Pro / Lum / 120.0		-0.88 ± 1.44
HAT-P-51b (LOW)
2025-09-04		Tommaso Dittadi
TD-TRO		Ritchey-Chretien
Moravian G2-1600 / R / 240.0		-1.02 ± 2.02
HAT-P-51b (LOW)
2025-09-04		Lluís Romero Ventura
Astro-Tolva		RC16"
MORAVIAN C3-61000EC PRO / Lum / 120.0		-4.05 ± 2.74
HAT-P-51b (LOW)
2025-09-04		Stefan Brenner
NOE Volkssternwarte AST		Martini-Truss mit Zambuto 11“ f/4,7
Omegon veTEC 571 C / Clear / 120.0		-6.06 ± 1.87
HAT-P-51b (LOW)
2025-09-04		Wilfried Hartmann
Observatory Stargate, Austria		Skywatcher 8" f/4
QHY MiniCam8 Mono / R / 120.0		-6.21 ± 4.03
HAT-P-51b (LOW)
2024-10-31		Pierre Farissier
Astroqueyras		FF 200
Moravian G2 4000 / Lum / 180.0		2.38 ± 3.02
HAT-P-51b (LOW)
2024-10-26		Snaevarr Guðmundsson
Ness Observatory		Meade LX 200 ACF Schmidt-Cassegrain
SBIG STL 11000M / R / 120.0		-2.78 ± 2.16
HAT-P-51b (LOW)
2024-08-11		Matthieu Bachschmidt
Gonachon		Celestron C11
SBIG ST8XME / AstrodonExoPlanet-BB / 120.0		1.92 ± 2.02
HAT-P-51b (LOW)
2024-08-11		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / Lum / 180.0		0.33 ± 1.18
HAT-P-51b (LOW)
2024-08-11		Martin Crow
Burnham Observatory		Celestron C9.25
SX694 mono / Clear / 200.0		-3.99 ± 1.58
HAT-P-51b (LOW)
2024-01-09		Martin Crow
Burnham Observatory		Celestron C9.25
SX694 mono / R / 240.0		4.54 ± 1.87
HAT-P-51b (LOW)
2024-01-09		Pieter Vuylsteke
TheGardenToTheSkyFacility		TS ONTC 25cm f4.7
QHY 268M / rpr / 150.0		3.82 ± 2.16
HAT-P-51b (LOW)
2024-01-09		Adrian Jones
Private Observatory (I64)		Meade ACF 30cm
QSI 583 / Lum / 200.0		3.24 ± 1.58
HAT-P-51b (LOW)
2024-01-09		Manfred Raetz
privat observatory Herges-Hallenberg		SCT 280/1850 (C11 with Starizona reducer)
Moravian Instruments G2-1600 / AstrodonExoPlanet-BB / 240.0		-0.07 ± 2.74
HAT-P-51b (LOW)
2023-09-01		samuel Diaz Lopez
Tomas Lopez (Astrocamp)		N-AG8
ASI533MM / rpr / 120.0		2.55 ± 3.17
HAT-P-51b (LOW)
2023-09-01		David Quiles
David Quiles Observatory		Celestron EDGEHD 800
Omegon veTEC 571M / R / 120.0		-4.65 ± 2.59
HAT-P-51b (LOW)
2022-12-26		Bryan Martin
Tiger Butte Observatory Remote		AG Optical IDK
ZWO ASI 294 / Clear / 120.0		1.66 ± 2.16
HAT-P-51b (LOW)
2022-11-26		Vikrant Kumar Agnihotri
Cepheid Observatory India		GSO Ritchey–Chrétien
SX-35 TRIUS mono (KAF11002) / Lum / 120.0		-3.32 ± 2.02
HAT-P-51b (LOW)
2022-11-09		Simon Dawes
William James II Observatory		Skywatcher MN190 2
ZWO ASI 1600MM-PRO USB 3.0 Mono Camera / Lum / 240.0		-1.62 ± 6.91
HAT-P-51b (LOW)
2022-10-07		Manfred Raetz
privat observatory Herges-Hallenberg		SCT 280 /1790 (Celestron C11 with reducer)
Moravian Instruments G2-1600 / AstrodonExoPlanet-BB / 120.0		-1.1 ± 1.44
HAT-P-51b (LOW)
2022-10-07		Dominique Suys
Dominique Suys		Meade LX200
SBIG ST8XME / Clear / 120.0		-1.26 ± 1.17
HAT-P-51b (LOW)
2022-08-09		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / Clear / 180.0		-3.43 ± 1.15
HAT-P-51b (LOW)
2021-10-05		Robert Roth
TURMX Observatory		CFF Telescopes 160mm APO
ZWO ASI6200MM Pro / Lum / 120.0		0.11 ± 1.3
HAT-P-51b (LOW)
2021-10-05		Robert Roth
TURMX Observatory		Planewave CDK17
QHY600M / rpr / 120.0		-0.18 ± 0.58
HAT-P-51b (LOW)
2021-09-30		Didier Laloum
Observatoire Privé du Mont (OPM)		RC 8 GSO
Atik 383L+ / AstrodonExoPlanet-BB / 120.0		1.72 ± 2.88
HAT-P-51b (LOW)
2021-09-30		Claudio Lopresti
Claudio Lopresti		Mak-Newton
CCD Sbig ST10xme / Lum / 240.0		0.28 ± 2.16
HAT-P-51b (LOW)
2021-09-30		Valère Perroud
Observatoire de Duines		RC 10
Moravian G2-4000 / Lum / 180.0		-1.01 ± 1.87
HAT-P-51b (LOW)
2020-11-05		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / Lum / 120.0		0.23 ± 1.01
HAT-P-51b (LOW)
2020-09-12		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / Clear / 120.0		1.9 ± 1.15
HAT-P-51b (LOW)
2020-01-19		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / Clear / 120.0		1.78 ± 0.86
HAT-P-51b (LOW)
2018-12-27		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / Clear / 120.0		1.99 ± 1.15
HAT-P-51b (LOW)
2018-12-27		Anaël Wünsche
Observatoire des Baronnies Provençales		Astelco
FLIPL230 / Lum / 120.0		1.12 ± 1.44
HAT-P-51b (LOW)
2018-12-10		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / Clear / 120.0		1.53 ± 1.01
HAT-P-51b (LOW)
2017-10-10		Anaël Wünsche
Observatoire des Baronnies Provençales		Astelco
FLIPL230 / Lum / 120.0		0.55 ± 0.86
HAT-P-51b (LOW)
2016-10-08		Anaël Wünsche
Observatoire des Baronnies Provençales		CDK Planewave
SBIG STL11K / Clear / 180.0		2.2 ± 1.44

Space Observations
Planet
Observation Date		 Mission O-C
minutes
HAT-P-51b (LOW)
2022-10-28		TESS5.81 ± 1.87
HAT-P-51b (LOW)
2022-10-23		TESS-1.51 ± 1.73
HAT-P-51b (LOW)
2022-10-19		TESS-0.47 ± 2.02
HAT-P-51b (LOW)
2022-10-15		TESS-1.45 ± 1.58
HAT-P-51b (LOW)
2022-10-07		TESS-2.11 ± 1.58
HAT-P-51b (LOW)
2022-10-02		TESS-2.08 ± 1.87

Literature Mid-times
Planet
Observation Date		 Reference O-C
minutes
2012-09-23 Hartman et al. 2015 -1.11 ± 0.58
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