New transit 3/22/2025

XO-4 b

49
   
avatar Yves Jongen, Rasteau Observatory, 3/5/2025

Plane Wave CDK 17" on Plane Wave L500 mountSBIG STXL 11002

New transit 4/5/2024

XO-4 b

49
   
avatar Giovanni Calapai, Home Astronomical Observatory
Celestron SCT 280/2800 Atik 314L+ red. 0,63x
Used IR filter
Exposure = 90 sec
New transit 4/4/2022

XO-4 b

49
   
avatar Mark Salisbury, Private Observatory
400mm f6.8, ST10XME, AO8 guider.
100 Second exposures through Rc filter. CCD unbinned. GPS time control.
New transit 12/7/2021

XO-4 b

49
   
avatar Fran Campos, Observatori Puig dAgulles
SC 12" f/6.6 on EQ8; SBIG ST-8XME, Johnson-Cousins BVRcIc filters
120" bin1 exposures
New transit 1/12/2021

XO-4 b

49
   
avatar Yves Jongen, Rasteau Observatory
Plane Wave CDK 17" & SBIG STXL11002
120 sec pics on Red filter.
New transit 12/2/2020

XO-4 b

49
   
avatar Bernhard Wenzel, Vienna Balcony Observatory
NWT 200 / 900 mm, Canon 200D
filter TG is close to V.
ISO400 60s,
full moon, clear sky
AAVSO Chart: X25774AKO
Muniwin 2.1.29
New transit 3/16/2020

XO-4 b

49
   
avatar Anaël Wünsche, UAI B10 Baronnies Provencales Observatory
Cassegrain 430 mm + STL 11K
60 exposures. Clear filter. Multicomparison stars. Slight defocus. Good conditions for first half then turbulences strenghtened and veil came for the end of the event, low. Consequently higher dispersion from 0:30UT.
New transit 2/8/2020

XO-4 b

49
   
avatar Mauro Calo, Avalon Merlino XL - Manciano

gso rc 10"

New transit 1/15/2020

XO-4 b

49
   
avatar Pere Guerra, Observatori Astronòmic Albanyà
16" Meade ACF F8, 10 Micron GM3000 HPS, Moravian G4-9000
1x1 Binning, focused, detrended with Airmass. Limb darkening coefficients locked to 0.3 for this model-fit.
New transit 1/7/2020

XO-4 b

49
   
avatar Yves Jongen, Rasteau observatory
PlaneWave CDK 17 SBIG STLX11002
10 sec pics on Green filter
28 minutes early vs. ETD
New transit 4/17/2019

XO-4 b

49
   
avatar Veli-Pekka Hentunen, Taurus Hill Observatory (A95), Varkaus, Finland
C-14, Paramount MEII, ST-8XME
60 sec exposures, 3 comparison stars, full moon
New transit 1/8/2019

XO-4 b

49
   
avatar Jean Plazas, Ribot Observatory
lunette 150/750 F/5 +starlight xpress
pose 30s seeing variable 3.5 -+ 0.5 humidity
New transit 9/29/2017

XO-4 b

49
   
avatar Gabriel Murawski, Suwałki
ASI178MM-c, Canon FD 300mm f/2.8 L, EQ5
Each point is an average of 50x5s measurements. That gap was caused by a software error (stopped collecting data until restart).
New transit 12/8/2016

XO-4 b

49
   
avatar Carson Reed Powers, Emory Observatory

0.6m DFM Cassegrain-ALTA Apogee U47

New transit 3/28/2015

XO-4 b

49
   
avatar Marc Bretton, UAI B10 Baronnies Provencales Observatory
Cassegrain 430 mm + STL 11K
30 sec exposure filter red binning 3x3
New transit 7/30/2014

XO-4 b

49
   
avatar Martin Zíbar, Chlumčany
Newton 254/903, sekční G2-0402, AG by MMys na SW 100/500
občasná přecházející oblačnost, po minimu přišla velká oblačnost, expozice 45 s, FWHM kolem 4, chlazeno na -30
New transit 3/30/2014

XO-4 b

49
   
avatar Dittler, Ullrich, Exoplaneten-Observatorium.de

SCT 11 EdgeHD, Reducer, SBIG STF-8300, Astrodon Exoplanet-Filter

New transit 3/30/2014

XO-4 b

49
   
avatar Mark Salisbury, Private Observatory
400mm f6.8ODK, ST10XME, AO8 & filter wheel
60 second defoussed exposures through Rc filter.
CCD binned 2x2, observations binned x2 for best fit.
Transit duration fixed and not fit due to partial transit.
New transit 12/26/2013

XO-4 b

49
   
avatar Janko Mravik, Jaroslav Grnja, Night Hawk opservatory, Backa Palanka

SW 150/750 + EQ6 + SBIG st7

New transit 12/1/2013

XO-4 b

49
   
avatar Paul Benni, Acton Sky Portal
C11EdgeHD SCT, ST8XME, & G11 GEM
BBC filter, 6 star ensemble, clear sky, EQ mount meridian flip gap E->W.
New transit 7/13/2013

XO-4 b

49
   
avatar Stan Shadick, University of Saskatchewan Physics Roof Observatory, CANADA
Meade 10\\\" LX200GPS; SBIG ST10XME CCD
cbb filter.
Processed with artificial star at 8X4X10 at binning 2.
Used only reference stars C1, C4-C11.
Pier 3.
New transit 4/2/2013

XO-4 b

49
   
avatar Nicolaj Haarup, Starworks Observatory
16\\\\\\\" Newton Astrograph, QHY8 (bin 1x1)
Exposure : 90 sec
ClockCorrn : 0 sec
Weather : No wind, -3C
De-focus : +70 stp
Anulus : 14
QHY8 gain : 0
QHY8 offset : 121
MaximDL : 1) Calibrated, 2) align, 3) arti.star, 4) color, 5) mono 6) photometry 7) Excel
Only checkstar 8 and 10 used.
New transit 1/11/2013

XO-4 b

49
   
avatar Stan Shadick, University of Saskatchewan Physics Roof Observatory, CANADA
Meade 12\\\" LX200; SBIG ST10XME CCD
cbb blue blocking filter.
Processed with artificial star at 5x4x10 at binning 2.
Used only reference stars C3 and C6.
Clouds near end of transit.
Pier 5.
New transit 12/30/2012

XO-4 b

49
   
avatar Stan Shadick, University of Saskatchewan Physics Roof Observatory, CANADA
Meade 12\\\" LX200; SBIG ST10XME CCD
Processed with artificial star at 9x4x10.
Used only reference stars C1, C2, C6.
Hazy clouds at end of transit.
Pier 5
New transit 3/1/2012

XO-4 b

49
   
avatar Ruben Garcia, Observatorio Busot MPC-J02
LX200GPS 14\\\" f:5.1 + AO-08 + ST8-XME
WET NIGHT. 120 sec. exposition.
New transit 2/8/2012

XO-4 b

49
   
avatar Stan Shadick, University of Saskatchewan Physics Roof Observatory
Meade 12\\\" LX200; SBIG ST10XMECCD
Processed with artificial star at 7x4x10
Used only reference stars C1-C8, C11, C12, C17
Pier 5
New transit 12/26/2011

XO-4 b

49
   
avatar Jordi Lopesino, Observatori Sant Pere, Mataró
S/C 305 mm F10 + CCD ST9 + AO8
exposición 60 seg
New transit 12/25/2011

XO-4 b

49
   
avatar Stan Shadick, University of Saskatchewan Physics Roof Observatory
Meade 12\\\" LX200; SBIG ST10XMECCD
CBB filter
Process with artificial star technique at 7x4x10
Used only reference stars C1-C3, C5-C7, C10, C18
New transit 11/26/2011

XO-4 b

49
   
avatar Fernand Emering, Abweiler Observatory
Newton 0.45m Canon EOS 1000D
intermittent fog
New transit 11/24/2011

XO-4 b

49
   
avatar Fernand Emering, Abweiler Observatory
Newton 0.45m Canon EOS 1000D
intermittent fog
New transit 6/18/2011

XO-4 b

49
   
avatar Stan Shadick, University of Saskatchewan Physics Roof Observatory
Meade 10\\\" LX200GPS; SBIG ST10XMECCD
CBB filter
Processed using Bruce Gary\\\'s artificial star spreadsheet technique at 10x4x10
Used Reference stars C1-C3,C6,C7,C9, C10,C16,C17,C24
New transit 4/20/2011

XO-4 b

49
   
avatar Stan Shadick, University of Saskatchewan Physics Roof Observatory
Meade 12\\\" LX200; SBIG ST10XMECCD
Processed with artificial star technique at 5x4x10
Only used reference stars C2,C3,C5,C6,C7, C9,C11,C12.
New transit 2/20/2011

XO-4 b

49
   
avatar Stan Shadick, University of Saskatchewan Physics Roof Observatory
Meade 10\\\" LX200GPS; SBIG ST10XMECCD
CBB filter
Processed with Artificial Star Photometry at 15X4X10
Binning 2
New transit 2/8/2011

XO-4 b

49
   
avatar Prof. Horace A Dale III, Emory Observatory

0.61m cassegrain f/8 with ST10-XME

New transit 12/5/2010

XO-4 b

49
   
avatar Dieter Husar, SATINO2

12\" Schmidt-Cassegrain; CCD: SBIG ST8; mount: ASA DDM-85

New transit 4/12/2010

XO-4 b

49
   
avatar Stanislav Poddaný, Štefánik observatory, Prague, Czech Republic
Meade LX 200 40,6 cm, SBIG ST10XME
Each data-point is the average of 5 measurements from individual 30 second exposures.
New transit 4/12/2010

XO-4 b

49
   
avatar Stanislav Poddaný, Štefánik observatory, Prague, Czech Republic
Meade LX 200 40,6 cm, SBIG ST10XME
exposure 30s,
New transit 3/10/2010

XO-4 b

49
   
avatar Trnka J., Městská hvězdárna Slaný MPC C11

Newton 200/1000, ST-9E

New transit 9/28/2008

XO-4 b

49
   
avatar Luboš Brát, ALTAN.Observatory
RL200, f/6 + CCD ST8 + R
180s exposure with autoguiding
New exoplanet 1/1/1970

XO-4 b

49
   
avatar admin
XO-4 b

RA: 110.3874999900, DE: 58.2683333320