Archive for moons

Ganymede’s shadow

Posted in Astrophotography with tags , , , , , , , , , , , , , , , , on 2009/08/20 by computerphysicslab

Yesterday night I had the chance to enjoy a multiple moon transition in Jupiter. Ganymede and Europa were crossing Jupiter and throwing their shadows to the big planet. Here it is an image of the event. At 23h 24m U.T Europa’s shadow was not visible yet. Io also appears at the photo but it was beneath the planet. In a minutes it would disappear.

The picture was taken with my digital reflex body (EOS Rebel XTi) and using the video capture software that converts it into a high quality webcam.

Jupiter-eclipse

Webcam astrophotography

Posted in Astrophotography with tags , , , , , , , , , , , , on 2009/07/24 by computerphysicslab

Tonight I have been able for the first time to use a webcam for doing astrophotography. The best up of it is the possibility to get a sharp focus looking at the laptop screen while correcting the focus. Besides, the resolution seems to double that of my digital pocket camera with the afocal technique. Up to now I haven’t got full resolution of 640×480 with my webcam, a Philips Toucam Pro (PCVC 740K). The drivers for XP are very naughty. I can only record 320×240 frames so long.

The down is the small field of view because the CCD sensor has not so many pixels like a digital camera. To find the target with a non-tracking mount is difficult. Here we see a prime focus shot that shows the Galilean moons and a Barlow 2x show showing the horizontal bands of the planet.

webcam-jupiter-320x240-01

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