exoclock

HAT-P-8b (LOW)

Discovered by: Latham et al. 2009

The Star
Simbad
GAIA
2MASS		 BD+34 4779
DR2 1891507552824189568
J22520985+3526495
RA 22:52:09.8635 DEC +35:26:49.606
Parallax
4.698 mas		 P.M. RA
74.747 mas/y		 P.M. DEC
15.048 mas/y
MagV
10.36		 MagR
10.15		 MagI*
9.749		 MagJ
9.214		 MagH
9.004		 MagK
8.953
MagG
10.149		 MagGBP
10.439		 MagGRP
9.731
*Calculated from GAIA magnitudes.

Ephemeris - Verified True
Kokori et al. 2025
Mid-time
2458193.89133 ± 0.00015 BJDTDB
Period
3.07634388 ± 2.3e-07 days
Transit Parameters
Mancini et al. 2013
Rp/Rs
0.0921 ± 0.0005		 a/Rs
6.29 +0.06 -0.06
 i
87.1 +0.4 -0.4 deg
e
-		 ω
- deg
DepthR*
10.94 mmag		 Duration*
3.93 hours
*Calculated from the other parameters, using PyLightcurve.
**Adjusted based on the space observations.

Limb Darkening Parameters
Latham et al. 2009
Teff
6200.0 +80.0 -80.0 K
 Log(g)
4.15 +0.05 -0.05 cm/s2
 Fe/H
0.01 +0.08 -0.08 dex
ExoClock Status
Observing Priority LOW
Minimum aperture 5.0"
Total Observations (Recent) 47 (6)
O-C 0.43 ± 0.75 minutes
ExoClock Observations (Recent) 27 (6)
Space Observations (Recent) 8 (0)
ETD Observations (Recent) 0 (0)
Literature Mid-times (Recent) 12 (0)
Kepler Rp/Rs -
TESS Rp/Rs 0.09198 ± 0.00025

HAT-P-8b


ExoClock Observations
Planet
Observation Date		 Observer
Observatory		 Telescope
Camera / Filter / Exp [s]		 O-C
minutes
HAT-P-8b (LOW)
2025-10-07		Tommaso Dittadi
TD-TRO		Ritchey-Chretien
Moravian G2-1600 / R / 90.0		4.27 ± 2.02
HAT-P-8b (LOW)
2025-08-28		Paolo Arcangelo Matassa
P:M.P.H.R. Deep Sky (K81)		Ritchey Chretien 40cm-F5.3
CCD ICX453AQ / Lum / 30.0		-0.38 ± 3.46
HAT-P-8b (LOW)
2025-07-23		Giovanni Calapai
Home Astronomical Observatory		Celestron 11 Schmidt-Cassegrain
Atik 314L+ / Clear / 90.0		3.11 ± 2.02
HAT-P-8b (LOW)
2025-07-23		Christian Sartini
Chris31		C9 xlt Celestron
ASI 294MM PRO / R / 20.0		2.11 ± 2.74
HAT-P-8b (LOW)
2025-07-23		Patrick Farizy
Patrick Farizy		Celestron C8
Touptek 585 C / Clear / 45.0		-0.2 ± 3.46
HAT-P-8b (LOW)
2025-07-23		Mark van der Grijp
Raspay Observatory		C9.25 HD
ZWO2600 MM Pro / R / 70.0		-2.79 ± 1.73
HAT-P-8b (LOW)
2024-11-15		jean paul vergne
JPV-la Verdière		T350-f/d3
zwo294mm pro / Lum / 120.0		1.9 ± 3.89
HAT-P-8b (LOW)
2024-10-13		Adrian Jones
Private Observatory (I64)		Meade ACF 30cm
QSI 583 / R / 40.0		-0.0 ± 2.02
HAT-P-8b (LOW)
2024-08-30		Paolo Arcangelo Matassa
P:M.P.H.R. Deep Sky (K81)		Ritchey Chretien 40cm-F5.3
CCD ICX453AQ / Lum / 30.0		-1.42 ± 1.73
HAT-P-8b (LOW)
2023-10-25		Bryan Martin
Tiger Butte Observatory Remote		AG Optical IDK
ZWO ASI 294 / Lum / 15.0		0.79 ± 4.18
HAT-P-8b (LOW)
2023-10-12		Sacha Foschino
Observatoire des Baronnies Provençales		Planewave 430mm
SVO ASI 6200 MM Pro / R / 120.0		6.65 ± 1.73
HAT-P-8b (LOW)
2023-10-12		Joan Josep Isach Cogollos
Centro Astronómico Alto Turia (CAAT). MPC J57		Skywatcher
ZWO ASI 1600 MM / Lum / 60.0		3.77 ± 2.3
HAT-P-8b (LOW)
2023-09-06		Gunther Fleerackers
gufle		Ritchey-Chrétien
QHY294M / V / 119.0		-1.08 ± 2.3
HAT-P-8b (LOW)
2022-11-20		Claudio Lopresti
Claudio Lopresti		Meade LX200 12"
CCD Sbig ST9xe / R / 120.0		-1.05 ± 1.87
HAT-P-8b (LOW)
2022-10-17		Adrian Jones
Private Observatory (I64)		Meade ACF 30cm
QSI 583 / R / 60.0		1.75 ± 1.09
HAT-P-8b (LOW)
2022-10-02		Po-Jian Chiu
zhshs obs		Takahashi FS-152
ZWO ASI6200MM / Lum / 60.0		5.72 ± 3.31
HAT-P-8b (LOW)
2022-09-04		Manfred Raetz
privat observatory Herges-Hallenberg		SCT 280 /1790 (Celestron C11 with reducer)
Moravian Instruments G2-1600 / R / 120.0		-0.76 ± 1.15
HAT-P-8b (LOW)
2022-08-29		Alexey Garmash
Lyceum 130		SW Esprit 150ED
ASI2600MM / V / 40.0		1.78 ± 1.31
HAT-P-8b (LOW)
2021-10-13		Claudio Lopresti
Claudio Lopresti		Meade LX200 12"
CCD Sbig ST9xe / Lum / 90.0		0.75 ± 1.44
HAT-P-8b (LOW)
2021-09-06		Paolo Arcangelo Matassa
P:M.P.H.R. Deep Sky (K81)		Ritchey Chretien 40cm-F5.3
CCD ICX453AQ / Clear / 90.0		-1.08 ± 2.16
HAT-P-8b (LOW)
2020-10-21		Manfred Raetz
privat observatory Herges-Hallenberg		SCT 280 /1790 (Celestron C11 with reducer)
Moravian Instruments G2-1600 / R / 120.0		0.16 ± 1.73
HAT-P-8b (LOW)
2020-09-15		Manfred Raetz
privat observatory Herges-Hallenberg		SCT 280 /1790 (Celestron C11 with reducer)
Moravian Instruments G2-1600 / R / 120.0		-3.55 ± 1.3
HAT-P-8b (LOW)
2020-09-08		Mauro Caló
Cavallino		RC
SBIG ST10 / Lum / 40.0		-1.26 ± 2.02
HAT-P-8b (LOW)
2020-08-02		Carmelo Falco
GALHassin Robotic Telescope 2 (GRT2)		Giacometti-Fogale RC16
Andor Apogee Aspen CG16M / Lum / 30.0		-0.21 ± 0.86
HAT-P-8b (LOW)
2020-07-30		Claudio Lopresti
Claudio Lopresti		Mak-Newton
CCD Sbig ST10xme / I / 120.0		-3.75 ± 3.02
HAT-P-8b (LOW)
2019-08-02		Nikolaos Paschalis
Nunki Observatory		Officina Stellare RILA 400
SBIG STXL 11002 / R / 60.0		3.85 ± 2.16
HAT-P-8b (LOW)
2016-08-15		Ramon Naves
Montcabrer		Meade LX200 12" ACF
Moravian G4-9000 / rpr / 120.0		0.68 ± 0.96

Space Observations
Planet
Observation Date		 Mission O-C
minutes
HAT-P-8b (LOW)
2022-09-29		TESS0.01 ± 0.49
HAT-P-8b (LOW)
2022-09-26		TESS-0.2 ± 0.53
HAT-P-8b (LOW)
2022-09-20		TESS0.17 ± 0.52
HAT-P-8b (LOW)
2022-09-17		TESS-0.01 ± 0.52
HAT-P-8b (LOW)
2022-09-14		TESS0.01 ± 0.56
HAT-P-8b (LOW)
2022-09-11		TESS-1.18 ± 0.58
HAT-P-8b (LOW)
2022-09-08		TESS1.52 ± 0.6
HAT-P-8b (LOW)
2022-09-04		TESS-0.35 ± 0.49

Literature Mid-times
Planet
Observation Date		 Reference O-C
minutes
2016-09-05 Wang et al. 2021 0.59 ± 2.74
2012-10-02 Mancini et al. 2013 -0.03 ± 1.2
2012-10-02 Mancini et al. 2013 -0.32 ± 0.45
2012-08-27 Mancini et al. 2013 1.54 ± 0.82
2012-08-27 Mancini et al. 2013 1.31 ± 0.73
2012-08-27 Mancini et al. 2013 -2.12 ± 0.78
2012-08-27 Mancini et al. 2013 -4.48 ± 1.58
2011-10-05 Mancini et al. 2013 0.27 ± 0.71
2011-10-05 Mancini et al. 2013 -0.22 ± 0.91
2010-08-28 Mancini et al. 2013 -1.6 ± 0.62
2009-10-22 Mancini et al. 2013 -2.91 ± 1.14
2007-12-03 Latham et al. 2009 1.61 ± 0.49
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