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Discovered by: McCullough et al. 2008

Priorities

EPHEMERIS PRIORITY The target uncertainty has been defined as the 1/12 of the target's transit duration (in 2029).
  • ALERT: Observations in the last 2 years show an O-C greater than 10 minutes.
  • HIGH: Prediction uncertainty greater than the target or less than 3 epochs observed in the last 2 years.
  • MEDIUM: Less than 3 epochs observed in the last year.
  • LOW: Else.
SPECIAL SCIENCE CASES
  • TTVs: Planet exhibiting strong Transit Timing Variations due to another planet or orbital decay/precession.
  • SPOTS: Planet with frequent spot-crossing events.
  • YOUNG: Planet in a young planetary system.
Close
The Star
SimbadGAIA2MASS XO-4DR2 990291507088739072J07213317+5816051
RA 07:21:33.1602 DEC +58:16:05.111
Parallax3.639 mas P.M. RA-16.989 mas/y P.M. DEC5.31 mas/y
MagV10.81 MagR*10.322 MagI*10.239 MagJ9.667 MagH9.476 MagK9.406
MagG10.513 MagGBP10.778 MagGRP10.117
*Calculated from GAIA magnitudes.
Ephemeris - Verified True
Kokori et al. 2025
Mid-time2458153.11815 ± 0.00018 BJDTDB
Period4.12506593 ± 3.8e-07 days
Transit Parameters
Narita et al. 2010
Rp/Rs0.0881 ± 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) 62 (5)
O-C -1.38 ± 0.57 minutes
ExoClock Observations (Recent) 30 (5)
Space Observations (Recent) 15 (0)
ETD Observations (Recent) 1 (0)
Literature Mid-times (Recent) 16 (0)
Kepler Rp/Rs -
TESS Rp/Rs 0.08627 ± 0.00024
XO-4b

ExoClock Observations
PlanetObservation Date ObserverObservatory Telescope Camera / Filter / Exp [s] O-Cminutes
XO-4b (LOW)2025-12-27Vojtěch ŠkolníkHvězdárna v ÚpiciSW N200/800MI C2-7000A / Clear / 60.01.1 ± 1.73View
XO-4b (LOW)2025-12-27Tommaso DittadiTD-TRORitchey-ChretienMoravian G2-1600 / R / 90.0-1.49 ± 1.58View
XO-4b (LOW)2025-04-02Üllar KivilaLooga ObservatoryTS Optics (GSO) 8" RCOmegon veTEC 585 C / Clear / 120.00.36 ± 1.73View
XO-4b (LOW)2025-03-05Simon DawesWilliam James IICelestron Edge11 HDRisingcam Monochrome SONY imx571 / Lum / 85.02.61 ± 2.45View
XO-4b (LOW)2025-03-05Yves JongenRasteau ObservatoryPlane Wave CDK 17"SBIG STXL 11002 / R / 60.0-8.91 ± 2.16View
XO-4b (LOW)2025-01-02Leon BewersdorffStarfront ObservatoriesCorrected Ritchey-ChrétienQHY268M / AstrodonExoPlanet-BB / 60.0-2.3 ± 2.3View
XO-4b (LOW)2024-12-24Claudio LoprestiClaudio LoprestiMak-NewtonCCD Sbig ST10xme / I / 240.01.34 ± 2.45View
XO-4b (LOW)2024-11-30Deborah SmithComplejo Astronomico Los Coloraos, GorafeC9.25QHY9 / R / 50.0-3.56 ± 1.73View
XO-4b (LOW)2024-10-24Martin CrowBurnham ObservatoryCelestron C9.25SX694 mono / R / 45.0-0.11 ± 2.74View
XO-4b (LOW)2024-10-24Michael NezelCelle ObservatoryCDK 14QHY 268M / R / 90.0-1.55 ± 1.35View
XO-4b (LOW)2024-04-04Giovanni CalapaiHome Astronomical ObservatoryCelestron 11 Schmidt-CassegrainAtik 314L+ / Clear / 90.0-1.65 ± 2.16View
XO-4b (LOW)2023-03-05Paolo Arcangelo MatassaP:M.P.H.R. Deep Sky (K81)Ritchey Chretien 40cm-F5.3CCD ICX453AQ / Lum / 30.0-0.46 ± 1.87View & Get data
XO-4b (LOW)2023-03-05Eric MinyBLOIS SOLOGNE ASTRONOMIE OBSERVATORYNewton T305QSI 683WS / Lum / 60.0-4.2 ± 2.45View & Get data
XO-4b (LOW)2023-01-31Marco StefaniniOsservatorio AldebaranRitchey-Chretien Altair AstroAtik 4000 LE / Lum / 250.0-1.43 ± 4.03View & Get data
XO-4b (LOW)2023-01-03Pieter VuylstekeTheGardenToTheSkyFacilityTS ONTC 25cm f4.7QHY 268M / rpr / 60.0-1.91 ± 1.73View & Get data
XO-4b (LOW)2022-03-07Mark SalisburyPOSTOrion Optics ODKSBIG ST-10 XME / R / 100.00.7 ± 1.15View & Get data
XO-4b (LOW)2022-02-11Kevin JohnsonHolbrook ObservatoryMeade LX10 EMCAtik 383L+ / R / 50.01.84 ± 2.3View & Get data
XO-4b (LOW)2022-02-02Paolo Arcangelo MatassaP:M.P.H.R. Deep Sky (K81)Ritchey Chretien 40cm-F5.3CCD ICX453AQ / Lum / 90.03.04 ± 2.16View & Get data
XO-4b (LOW)2021-12-31Fran CamposPuig d'Agulles ObservtoryRC14" on EQ8 German mountSBIG ST-8XME / R / 60.06.68 ± 1.3View & Get data
XO-4b (LOW)2021-01-11Yves JongenRasteau ObservatoryPlane Wave CDK 17"SBIG STXL 11002 / R / 120.0-0.28 ± 1.58View & Get data
XO-4b (LOW)2020-11-06Adrian JonesPrivate Observatory (I64)Meade ACF 30cmQSI 583 / R / 30.0-1.78 ± 4.32View & Get data
XO-4b (LOW)2020-11-02Alberto TomatisAlto-ObservatoryRCSTL 6303 / Lum / 60.04.22 ± 3.17View & Get data
XO-4b (LOW)2020-10-28Martin CrowBurnham ObservatoryCelestron C9.25SX694 mono / R / 15.01.29 ± 4.32View & Get data
XO-4b (LOW)2020-03-11Nikolaos PaschalisNunki ObservatoryOfficina Stellare RILA 400SBIG STXL 11002 / R / 60.03.29 ± 2.02View & Get data
XO-4b (LOW)2020-03-11Alessandro NastasiGalhassin Robotic Telescope 1 (GRT1)Officina Stellare RiLa 400FLI ProLine 16803 / R / 45.02.57 ± 2.16View & Get data
XO-4b (LOW)2020-03-11Danilo SeditaOsservatorio Sedita CastrofilippoRC GSO 14"Moravian G2-1600 / R / 30.01.28 ± 1.44View & Get data
XO-4b (LOW)2020-02-07Mauro CalóCavallinoRCSBIG ST10 / R / 60.0-1.28 ± 4.32View & Get data
XO-4b (LOW)2020-02-03Tõnis EenmäeTartu ObservatoryPlanewave CDK 12.5Apogee Alta U42 / R / 30.02.85 ± 0.86View & Get data
XO-4b (LOW)2020-01-05Pere GuerraObservatori Astronòmic Albanyà16" Meade ACF F8Moravian G4-9000 / I / 120.01.36 ± 1.87View & Get data
XO-4b (LOW)2020-01-05Yves JongenRasteau ObservatoryPlane Wave CDK 17"SBIG STXL 11002 / V / 120.0-0.52 ± 1.73View & Get data

Space Observations
PlanetObservation Date Mission O-Cminutes
XO-4b (LOW)2023-01-15TESS1.31 ± 0.82View & Get data
XO-4b (LOW)2023-01-11TESS-1.07 ± 0.76View & Get data
XO-4b (LOW)2023-01-03TESS0.22 ± 0.79View & Get data
XO-4b (LOW)2022-12-29TESS-2.89 ± 0.95View & Get data
XO-4b (LOW)2022-01-25TESS0.1 ± 0.85View & Get data
XO-4b (LOW)2022-01-21TESS-0.12 ± 0.84View & Get data
XO-4b (LOW)2022-01-17TESS-0.14 ± 0.79View & Get data
XO-4b (LOW)2022-01-13TESS-2.84 ± 0.81View & Get data
XO-4b (LOW)2022-01-09TESS-1.43 ± 0.68View & Get data
XO-4b (LOW)2022-01-05TESS-1.29 ± 0.71View & Get data
XO-4b (LOW)2020-01-18TESS-0.11 ± 0.86View & Get data
XO-4b (LOW)2020-01-14TESS0.16 ± 0.85View & Get data
XO-4b (LOW)2020-01-09TESS0.61 ± 0.82View & Get data
XO-4b (LOW)2020-01-05TESS0.31 ± 0.81View & Get data
XO-4b (LOW)2020-01-01TESS1.41 ± 0.71View & Get data

ETD Observations
PlanetObservation Date Observer(s) ETD link O-Cminutes
XO-4b (LOW)2020-03-16Anaël Wünsche15843280421.61 ± 1.87View

Literature Mid-times
PlanetObservation Date Reference O-Cminutes
2012-01-07 Villanueva et al. 2016 3.05 ± 1.3 View
2010-03-18 Villanueva et al. 2016 4.71 ± 1.73 View
2010-02-09 Narita et al. 2010 1.43 ± 0.94 View
2010-02-09 Villanueva et al. 2016 -1.44 ± 1.05 View
2009-12-05 Villanueva et al. 2016 -4.29 ± 2.16 View
2009-11-10 Villanueva et al. 2016 1.31 ± 1.44 View
2009-09-05 Narita et al. 2010 3.84 ± 1.58 View
2009-02-11 Villanueva et al. 2016 -2.93 ± 2.74 View
2009-01-17 Villanueva et al. 2016 -2.94 ± 4.03 View
2009-01-13 Todorov et al. 2012 1.62 ± 0.86 View
2009-01-09 Todorov et al. 2012 -0.59 ± 1.15 View
2008-12-11 Todorov et al. 2012 -3.38 ± 1.01 View
2008-11-12 Villanueva et al. 2016 3.91 ± 1.73 View
2008-10-10 Narita et al. 2010 1.34 ± 1.64 View
2008-10-06 Narita et al. 2010 1.8 ± 1.51 View
2008-01-20 McCullough et al. 2008 -2.22 ± 0.58 View
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