exoclock

XO-4b (LOW)

Discovered by: McCullough et al. 2008

The Star
Simbad
GAIA
2MASS
XO-4
DR2 990291507088739072
J07213317+5816051
RA 07:21:33.1602 DEC +58:16:05.111
Parallax
3.639 mas
P.M. RA
-16.989 mas/y
P.M. DEC
5.31 mas/y
MagV
10.81
MagR*
10.322
MagI*
10.239
MagJ
9.667
MagH
9.476
MagK
9.406
MagG
10.513
MagGBP
10.778
MagGRP
10.117
*Calculated from GAIA magnitudes.

Ephemeris - Verified True
Kokori et al. 2022
Mid-time
2456878.47303 ± 0.00023 BJDTDB
Period
4.12506679 ± 4.8e-07 days

Transit Parameters
Narita et al. 2010
Rp/Rs
0.0881 ± 0.0007
a/Rs
7.68 +0.11 -0.11
i
88.8 +0.6 -0.6 deg
e
-
ω
- deg
DepthR*
10.15 mmag
Duration*
4.43 hours
*Calculated from the other parameters, using PyLightcurve.
**Adjusted based on the space observations.

Limb Darkening Parameters
McCullough et al. 2008
Teff
6397.0 +70.0 -70.0 K
Log(g)
4.18 +0.07 -0.07 cm/s2
Fe/H
-0.04 +0.03 -0.03 dex
ExoClock Status
Observing Priority LOW
Minimum aperture 5.0"
Total Observations (Recent) 37 (4)
O-C 0.72 ± 0.63 minutes
ExoClock Observations (Recent) 16 (4)
Space Observations (Recent) 5 (0)
ETD Observations (Recent) 0 (0)
Literature Mid-times (Recent) 16 (0)
Kepler Rp/Rs -
TESS Rp/Rs 0.08651 ± 0.00041

XO-4b


ExoClock Observations

Planet
Observation Date
Observer
Observatory
Telescope
Camera / Filter / Exp [s]
O-C
minutes
XO-4b (LOW)
2023-01-03
Pieter Vuylsteke
TheGardenToTheSkyFacility
TS ONTC 25cm f4.7
QHY 268M / rpr / 60.0
-3.2 ± 1.73
XO-4b (LOW)
2022-03-07
Mark Salisbury
POST
Orion Optics ODK
SBIG ST-10 XME / R / 100.0
-0.5 ± 1.15
XO-4b (LOW)
2022-02-11
Kevin Johnson
Holbrook Observatory
Meade LX10 EMC
Atik 383L+ / R / 50.0
0.65 ± 2.3
XO-4b (LOW)
2022-02-02
Paolo Arcangelo Matassa
P:M.P.H.R. Deep Sky (K81)
Ritchey Chretien 40cm-F5.3
CCD ICX453AQ / Lum / 90.0
1.86 ± 2.16
XO-4b (LOW)
2021-12-31
Fran Campos
Puig d'Agulles Observtory
RC14" on EQ8 German mount
SBIG ST-8XME / R / 60.0
5.5 ± 1.3
XO-4b (LOW)
2021-01-11
Yves Jongen
Rasteau Observatory
Plane Wave CDK 17"
SBIG STXL 11002 / R / 120.0
-1.34 ± 1.58
XO-4b (LOW)
2020-11-06
Adrian Jones
Private Observatory (I64)
Meade ACF 30cm
QSI 583 / R / 30.0
-2.83 ± 4.32
XO-4b (LOW)
2020-11-02
Alberto Tomatis
Alto-Observatory
RC
STL 6303 / Lum / 60.0
3.17 ± 3.17
XO-4b (LOW)
2020-10-28
Martin Crow
Burnham Observatory
Celestron C9.25
SX694 mono / R / 15.0
0.24 ± 4.32
XO-4b (LOW)
2020-03-11
Nikolaos Paschalis
Nunki Observatory
Officina Stellare RILA 400
SBIG STXL 11002 / R / 60.0
2.32 ± 2.02
XO-4b (LOW)
2020-03-11
Alessandro Nastasi
Galhassin Robotic Telescope 1 (GRT1)
Officina Stellare RiLa 400
FLI ProLine 16803 / R / 45.0
1.6 ± 2.16
XO-4b (LOW)
2020-03-11
Danilo Sedita
Osservatorio Sedita Castrofilippo
RC GSO 14"
Moravian G2-1600 / R / 30.0
0.3 ± 1.44
XO-4b (LOW)
2020-02-07
Mauro Caló
Cavallino
RC
SBIG ST10 / R / 60.0
-2.24 ± 4.32
XO-4b (LOW)
2020-02-03
Tõnis Eenmäe
Tartu Observatory
Planewave CDK 12.5
Apogee Alta U42 / R / 30.0
1.89 ± 0.86
XO-4b (LOW)
2020-01-05
Pere Guerra
Observatori Astronòmic Albanyà
16" Meade ACF F8
Moravian G4-9000 / I / 120.0
0.4 ± 1.87
XO-4b (LOW)
2020-01-05
Yves Jongen
Rasteau Observatory
Plane Wave CDK 17"
SBIG STXL 11002 / V / 120.0
-1.47 ± 1.73

Space Observations

Planet
Observation Date
Mission O-C
minutes
XO-4b (LOW)
2020-01-18
TESS-1.18 ± 0.86
XO-4b (LOW)
2020-01-14
TESS-0.86 ± 0.81
XO-4b (LOW)
2020-01-09
TESS-0.39 ± 0.81
XO-4b (LOW)
2020-01-05
TESS-0.58 ± 0.78
XO-4b (LOW)
2020-01-01
TESS0.41 ± 0.71

Literature Mid-times

Planet
Observation Date
Reference O-C
minutes
2012-01-07 Villanueva et al. 2016 2.97 ± 1.3
2010-03-18 Villanueva et al. 2016 4.83 ± 1.73
2010-02-09 Narita et al. 2010 1.56 ± 0.94
2010-02-09 Villanueva et al. 2016 -1.31 ± 1.05
2009-12-05 Villanueva et al. 2016 -4.15 ± 2.16
2009-11-10 Villanueva et al. 2016 1.47 ± 1.44
2009-09-05 Narita et al. 2010 4.02 ± 1.58
2009-02-11 Villanueva et al. 2016 -2.69 ± 2.74
2009-01-17 Villanueva et al. 2016 -2.69 ± 4.03
2009-01-13 Todorov et al. 2012 1.87 ± 0.86
2009-01-09 Todorov et al. 2012 -0.34 ± 1.15
2008-12-11 Todorov et al. 2012 -3.12 ± 1.01
2008-11-12 Villanueva et al. 2016 4.18 ± 1.73
2008-10-10 Narita et al. 2010 1.62 ± 1.64
2008-10-06 Narita et al. 2010 2.07 ± 1.51
2008-01-20 McCullough et al. 2008 -1.86 ± 0.58
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