exoclock

XO-3b (LOW)

Discovered by: Johns-Krull et al. 2008

The Star
Simbad
GAIA
2MASS		 BD+57 793
DR2 470650560777348352
J04215269+5749018
RA 04:21:52.7044 DEC +57:49:01.892
Parallax
4.666 mas		 P.M. RA
-2.516 mas/y		 P.M. DEC
4.003 mas/y
MagV
9.85		 MagR*
9.567		 MagI*
9.354		 MagJ
9.013		 MagH
8.845		 MagK
8.791
MagG
9.739		 MagGBP
9.965		 MagGRP
9.393
*Calculated from GAIA magnitudes.

Ephemeris - Verified True
Kokori et al. 2025
Mid-time
2458691.40475 ± 0.0001 BJDTDB
Period
3.19152416 ± 1.5e-07 days
Transit Parameters
Wong et al. 2014
Rp/Rs
0.0882 ± 0.0004		 a/Rs
7.05 +0.08 -0.1
 i
84.11 +0.16 -0.16 deg
e
0.2769 +0.0017 -0.0016
 ω
347.2 +1.7 -1.6 deg
DepthR*
8.73 mmag		 Duration*
2.94 hours
*Calculated from the other parameters, using PyLightcurve.
**Adjusted based on the space observations.

Limb Darkening Parameters
Johns-Krull et al. 2008
Teff
6429.0 +50.0 -50.0 K
 Log(g)
3.95 +0.06 -0.06 cm/s2
 Fe/H
-0.18 +0.03 -0.03 dex
ExoClock Status
Observing Priority LOW
Minimum aperture 5.0"
Total Observations (Recent) 80 (4)
O-C -0.03 ± 0.49 minutes
ExoClock Observations (Recent) 48 (4)
Space Observations (Recent) 16 (0)
ETD Observations (Recent) 0 (0)
Literature Mid-times (Recent) 16 (0)
Kepler Rp/Rs -
TESS Rp/Rs 0.08923 ± 0.00021

XO-3b


ExoClock Observations
Planet
Observation Date		 Observer
Observatory		 Telescope
Camera / Filter / Exp [s]		 O-C
minutes
XO-3b (LOW)
2026-03-07		Manfred Raetz
privat observatory Herges-Hallenberg		SCT 280/1850 (C11 with Starizona reducer)
Moravian Instruments G2-1600 / R / 120.0		-1.78 ± 1.58
XO-3b (LOW)
2025-11-28		Tommaso Dittadi
TD-TRO		Ritchey-Chretien
Moravian G2-1600 / R / 60.0		-7.33 ± 2.3
XO-3b (LOW)
2025-10-28		David González Martínez
GDAO		CELESTRON C8
ASI ZWO 294 MM PRO / R / 60.0		-3.38 ± 2.74
XO-3b (LOW)
2025-09-22		David Wright
Goveryk (private observatory)		Ritchey-Chretien
QSI 683WSG-8 / R / 60.0		-1.13 ± 2.88
XO-3b (LOW)
2025-03-05		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / R / 30.0		0.88 ± 1.15
XO-3b (LOW)
2025-03-05		Manfred Raetz
privat observatory Herges-Hallenberg		SCT 280/1850 (C11 with Starizona reducer)
Moravian Instruments G2-1600 / I / 90.0		-2.54 ± 1.58
XO-3b (LOW)
2025-02-17		Daniel BOUYSSE
OAA46500		RC TS-Optics f/6.4
ASI2600MC Pro / Lum / 60.0		-1.07 ± 2.3
XO-3b (LOW)
2024-12-28		Matthieu Bachschmidt
Gonachon		Celestron C11
SBIG ST8XME / R / 30.0		2.23 ± 1.44
XO-3b (LOW)
2024-12-28		Manfred Raetz
privat observatory Herges-Hallenberg		SCT 280/1850 (C11 with Starizona reducer)
Moravian Instruments G2-1600 / I / 90.0		1.69 ± 1.17
XO-3b (LOW)
2024-12-19		Bryan Martin
Tiger Butte Observatory Remote		AG Optical IDK
ZWO ASI 294 / I / 90.0		-5.16 ± 3.46
XO-3b (LOW)
2024-12-12		Snaevarr Guðmundsson
Ness Observatory		Meade LX 200 ACF Schmidt-Cassegrain
SBIG STL 11000M / AstrodonExoPlanet-BB / 45.0		1.11 ± 2.74
XO-3b (LOW)
2024-12-12		Francesco Scaggiante
Gruppo Astrofili Salese "GALILEO GALILEI"		NEWTON 410/1710
Player One Astronomy Poseidon-M Pro (IMX571) / rpr / 30.0		0.39 ± 2.74
XO-3b (LOW)
2024-11-26		Alexey Garmash
Lyceum 130		SW Esprit 150ED
ASI1600MM / V / 60.0		2.14 ± 1.44
XO-3b (LOW)
2023-12-31		Mercedes Correa
Sirius B		Meade
Moravian G2 1600 / R / 70.0		1.73 ± 2.88
XO-3b (LOW)
2023-12-27		Paolo Arcangelo Matassa
P:M.P.H.R. Deep Sky (K81)		Ritchey Chretien 40cm-F5.3
CCD ICX453AQ / R / 60.0		-0.54 ± 3.17
XO-3b (LOW)
2023-09-07		Miguel Ángel Álava Amat
Sarriguren		Meade SC 8"
Asi 1600 MM / rpr / 180.0		-1.19 ± 2.59
XO-3b (LOW)
2023-02-14		Stefano Lora
MarSEC		Ritchey Chrétien
Moravian G2 Mark II / R / 90.0		5.06 ± 2.3
XO-3b (LOW)
2023-02-14		Pieter Vuylsteke
TheGardenToTheSkyFacility		TS ONTC 25cm f4.7
QHY 268M / rpr / 60.0		3.75 ± 1.3
XO-3b (LOW)
2023-02-14		Livia Moretti
Leavitt Observatory		Ritchey-Chrétien 10'' f/8
QHY268 / R / 70.0		1.46 ± 2.02
XO-3b (LOW)
2023-02-14		Paolo Arcangelo Matassa
P:M.P.H.R. Deep Sky (K81)		Ritchey Chretien 40cm-F5.3
CCD ICX453AQ / Lum / 15.0		-0.7 ± 2.02
XO-3b (LOW)
2023-02-14		Francesco Scaggiante
Gruppo Astrofili Salese "GALILEO GALILEI"		NEWTON 410/1710
Custom made with KAF-1603ME CCD sensor / R / 15.0		-0.98 ± 1.87
XO-3b (LOW)
2022-12-09		Adrian Jones
Private Observatory (I64)		Meade ACF 30cm
QSI 583 / R / 30.0		-0.01 ± 1.37
XO-3b (LOW)
2022-11-23		Fabio Mortari
Hypatia Observatory		Ritchey Chretienne 250mm f/5.3
MORAVIAN C2-7000A / R / 80.0		-2.1 ± 2.74
XO-3b (LOW)
2022-11-11		Mark van der Grijp
Trevinca Observatory		William Optics FLT132
ZWO ASI2600mm Pro / Lum / 75.0		-1.81 ± 1.87
XO-3b (LOW)
2022-01-27		Simon Dawes
William James II Observatory		Skywatcher MN190 2
ZWO ASI 1600MM-PRO USB 3.0 Mono Camera / R / 90.0		-0.26 ± 4.32
XO-3b (LOW)
2022-01-27		Mark Salisbury
POST		Orion Optics ODK
SBIG ST-10 XME / R / 80.0		-1.99 ± 1.15
XO-3b (LOW)
2022-01-27		Adrian Jones
Private Observatory (I64)		Meade ACF 30cm
QSI 583 / R / 60.0		-2.14 ± 2.02
XO-3b (LOW)
2022-01-11		Giorgio Baj
M57		Ritchey-Chretien
Sbig STT1603 ME / R / 180.0		3.94 ± 2.3
XO-3b (LOW)
2021-12-10		Fran Campos
Puig d'Agulles Observtory		SC12" on EQ8 German mount
SBIG ST-8XME / R / 45.0		2.85 ± 2.3
XO-3b (LOW)
2021-12-10		Adrian Jones
Private Observatory (I64)		Meade ACF 30cm
QSI 583 / R / 60.0		-1.76 ± 2.59
XO-3b (LOW)
2021-11-21		Harri Kiiskinen
Harri Kiiskinen		Takahashi FSQ-85ED
QHY163M / R / 30.0		-0.25 ± 4.32
XO-3b (LOW)
2021-11-21		Martin Crow
Burnham Observatory		Celestron C9.25
SX694 mono / R / 10.0		-0.25 ± 4.32
XO-3b (LOW)
2021-03-01		Fabio Mortari
Hypatia Observatory		Ritchey Chretienne 250mm f/5.3
Sbig ST8-XE / R / 120.0		5.23 ± 2.16
XO-3b (LOW)
2020-11-23		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / R / 30.0		0.26 ± 2.45
XO-3b (LOW)
2020-11-07		Yves Jongen
Rasteau Observatory		Plane Wave CDK 17"
SBIG STXL 11002 / R / 60.0		2.88 ± 2.3
XO-3b (LOW)
2020-11-07		Mauro Caló
Cavallino		RC
SBIG ST10 / Lum / 60.0		-2.16 ± 2.3
XO-3b (LOW)
2020-11-03		Simon Dawes
William James II Observatory		Skywatcher MN190 2
ZWO ASI 1600MM-PRO USB 3.0 Mono Camera / R / 30.0		3.06 ± 3.02
XO-3b (LOW)
2020-11-03		Martin Crow
Burnham Observatory		Celestron C9.25
SX694 mono / R / 5.0		2.05 ± 3.17
XO-3b (LOW)
2020-11-03		Mark Phillips
Forthimage		OO Newtonian CMOS
QHY168C / Clear / 30.0		1.04 ± 4.32
XO-3b (LOW)
2020-11-03		Adrian Jones
Private Observatory (I64)		Meade ACF 30cm
QSI 583 / R / 30.0		-0.4 ± 4.32
XO-3b (LOW)
2020-10-22		Adrian Jones
Private Observatory (I64)		Meade ACF 30cm
QSI 583 / R / 30.0		4.06 ± 2.74
XO-3b (LOW)
2020-10-22		Carmelo Falco
GALHassin Robotic Telescope 2 (GRT2)		Giacometti-Fogale RC16
Andor Apogee Aspen CG16M / B / 20.0		0.03 ± 2.16
XO-3b (LOW)
2020-03-15		Alberto Tomatis
Alto-Observatory		RC
STL 6303 / R / 50.0		0.7 ± 3.46
XO-3b (LOW)
2020-02-28		Mauro Caló
Cavallino		RC
SBIG ST10 / R / 60.0		5.63 ± 1.73
XO-3b (LOW)
2020-02-28		Alessandro Nastasi
Galhassin Robotic Telescope 1 (GRT1)		Officina Stellare RiLa 400
FLI ProLine 16803 / R / 45.0		4.47 ± 2.3
XO-3b (LOW)
2020-02-28		Alberto Tomatis
Alto-Observatory		RC
STL 6303 / R / 50.0		3.61 ± 2.02
XO-3b (LOW)
2020-01-24		Alessandro Nastasi
Galhassin Robotic Telescope 1 (GRT1)		Officina Stellare RiLa 400
FLI ProLine 16803 / R / 40.0		-1.05 ± 1.15
XO-3b (LOW)
2020-01-08		Anaël Wünsche
Observatoire des Baronnies Provençales		CDK Planewave
SBIG STL11K / V / 60.0		0.42 ± 1.73

Space Observations
Planet
Observation Date		 Mission O-C
minutes
XO-3b (LOW)
2023-12-31		TESS-0.33 ± 0.53
XO-3b (LOW)
2023-12-18		TESS-0.29 ± 0.59
XO-3b (LOW)
2023-12-15		TESS-0.85 ± 0.59
XO-3b (LOW)
2023-12-11		TESS0.92 ± 0.59
XO-3b (LOW)
2022-12-22		TESS-0.13 ± 0.56
XO-3b (LOW)
2022-12-19		TESS-0.56 ± 0.58
XO-3b (LOW)
2022-12-16		TESS0.4 ± 0.56
XO-3b (LOW)
2022-12-13		TESS-0.71 ± 0.65
XO-3b (LOW)
2022-12-06		TESS-0.84 ± 0.6
XO-3b (LOW)
2022-11-30		TESS-0.91 ± 0.53
XO-3b (LOW)
2019-12-20		TESS0.92 ± 0.53
XO-3b (LOW)
2019-12-17		TESS0.32 ± 0.6
XO-3b (LOW)
2019-12-14		TESS-0.28 ± 0.58
XO-3b (LOW)
2019-12-07		TESS0.12 ± 0.52
XO-3b (LOW)
2019-12-04		TESS0.24 ± 0.55
XO-3b (LOW)
2019-12-01		TESS0.29 ± 0.52

Literature Mid-times
Planet
Observation Date		 Reference O-C
minutes
2012-12-01 Turner et al. 2017 2.5 ± 2.16
2009-02-02 Winn et al. 2009 0.46 ± 0.58
2008-02-29 Hébrard et al. 2008 2.71 ± 3.74
2008-02-17 Winn et al. 2008 -1.76 ± 1.3
2008-02-10 Winn et al. 2008 -3.81 ± 1.7
2008-01-16 Winn et al. 2008 1.32 ± 1.01
2008-01-13 Winn et al. 2008 1.4 ± 1.71
2007-12-31 Winn et al. 2008 0.14 ± 0.55
2007-12-15 Winn et al. 2008 -1.37 ± 0.96
2007-11-07 Winn et al. 2008 -1.46 ± 2.32
2007-10-25 Winn et al. 2008 -0.91 ± 0.95
2007-10-22 Winn et al. 2008 -0.91 ± 2.4
2007-10-18 Winn et al. 2008 -1.31 ± 1.87
2007-10-09 Winn et al. 2008 -1.58 ± 1.61
2007-10-09 Winn et al. 2008 -1.91 ± 3.82
2007-09-17 Winn et al. 2008 4.34 ± 2.49
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