exoclock

XO-4b

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. 2020
Mid-time
2455067.5685 ± 0.0003 BJDTDB
Period
4.1250683 ± 1.3e-06 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

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
Total Observations (Recent)
O-C minutes
Total Literature Mid-times
LOW
10 (0)
-0.9±0.6
16
XO-4b


ExoClock Observations
Observation
Date
Observer
Observatory
Telescope
Camera / Filter / Exp [s]
O-C
minutes
2021-01-10 Yves Jongen
Rasteau Observatory
Plane Wave CDK 17"
SBIG STXL 11002 / R / 120.0
-3.2 ± 1.6
2020-11-06 Adrian Jones
Private Observatory (I64)
Meade ACF 30cm
QSI 583 / R / 30.0
-4.7 ± 4.3
2020-11-01 Alberto Tomatis
Alto-Observatory
RC
STL 6303 / Lum / 60.0
1.3 ± 3.2
2020-10-28 Martin Crow
Burnham Observatory
Celestron C9.25
SX694 mono / R / 15.0
-1.6 ± 4.3
2020-03-11 Alessandro Nastasi
Galhassin Robotic Telescope 1 (GRT1)
Officina Stellare RiLa 400
FLI ProLine 16803 / R / 45.0
-0.1 ± 2.2 - Data available
2020-03-11 Danilo Sedita
Osservatorio Sedita Castrofilippo
RC GSO
Moravian G2-1600 / Rc / 30.0
-1.4 ± 1.4 - Data available
2020-02-07 Mauro Calo’
Cavallino
GSO RC
SBIG ST10 / R / 60.0
-4.0 ± 4.3 - Data available
2020-02-03 Tõnis Eenmäe
Tartu Observatory
Planewave CDK 12.5
Apogee Alta U42 / R / 30.0
0.2 ± 0.9
2020-01-05 Yves Jongen
Rasteau Observatory
Plane Wave CDK 17"
SBIG STXL 11002 / V / 120.0
-0.9 ± 2.3
2020-01-05 Pere Guerra
Observatori Astronòmic Albanyà
16" Meade ACF F8
Moravian G4-9000 / Ic / 120.0
-1.3 ± 1.9 - Data available


Literature Mid-times
Observation
Date
Mid-time Time format Reference O-C
minutes
2012-01-07 2455933.834816 ± 0.0009 BJD_TDB Villanueva et al. 2016 2.8 ± 1.3
2010-03-18 2455273.82543 ± 0.0012 BJD_TDB Villanueva et al. 2016 5.0 ± 1.7
2010-02-09 2455236.69753 ± 0.00065 BJD_TDB Narita et al. 2010 1.8 ± 0.9
2010-02-09 2455236.69554 ± 0.00073 BJD_TDB Villanueva et al. 2016 -1.1 ± 1.1
2009-12-05 2455170.692531 ± 0.0015 BJD_TDB Villanueva et al. 2016 -3.9 ± 2.2
2009-11-10 2455145.946277 ± 0.001 BJD_TDB Villanueva et al. 2016 1.7 ± 1.4
2009-09-05 2455079.94672 ± 0.0011 BJD_TDB Narita et al. 2010 4.3 ± 1.6
2009-02-11 2454873.688662 ± 0.0019 BJD_TDB Villanueva et al. 2016 -2.3 ± 2.7
2009-01-17 2454848.938339 ± 0.0028 BJD_TDB Villanueva et al. 2016 -2.3 ± 4.0
2009-01-13 2454844.81636 ± 0.0006 BJD_TDB Todorov et al. 2012 2.3 ± 0.9
2009-01-09 2454840.68979 ± 0.0008 BJD_TDB Todorov et al. 2012 0.1 ± 1.2
2008-12-11 2454811.81238 ± 0.0007 BJD_TDB Todorov et al. 2012 -2.7 ± 1.0
2008-11-12 2454782.941958 ± 0.0012 BJD_TDB Villanueva et al. 2016 4.6 ± 1.7
2008-10-10 2454749.93969 ± 0.00114 BJD_TDB Narita et al. 2010 2.1 ± 1.6
2008-10-06 2454745.81494 ± 0.00105 BJD_TDB Narita et al. 2010 2.5 ± 1.5
2008-01-20 2454485.9322 ± 0.0004 HJD_UTC McCullough et al. 2008 -1.3 ± 0.6
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