Early this morning I woke up at 5 am for the observation of an occultation between two Jovian satellites – Ganymede (J3) occulted (O) partially (P) Io (J1). The occultation lasted about 5 minutes from 05:58 to 06:03 am local time. The magnitude drop was 0.2 mag. Due to the proximity of the satellite pair to Jupiter and the bright moon, the observation was made in the Near Infrared spectrum. Darks and flats were acquired, too. I reduced the data with software AIP4WIN. Here are the first results in the form of a light curve. The ascending part of the LC is partially obstructed by an uncertainty factor (vertical red bars) due to a passing cloud. The final data, after analysis and normalization, will be sent to IMCCE.
Telescope: Laval Club 20-cm Schmidt-Cassegrain with focal reducer f/6.3, CCD: ATIK-16-HR, Photometric filter: Bessell (IR). 110 images captured, exposure time was ~1 second, binning mode 2X2.
Here is a typical fit file capture of the event. The photometry targets that were measured are V: Io & Ganymede, C1: Europa.
Details about the geometry of the event: http://www.hristopavlov.net/SatWatcher/2014-11-8-11-0-32-Ganymede(III)_Io(I).html
Also see a very good article (in French) by Roger Menard: Liste des PHÉMUS 2014-2015 visibles de Laval, Québec
Waiting for the next mutual !!!