The 29th and 30th of January was the closest approach of Mars since 2007 and the ‘largest’ Moon of 2010. Thankfully the skies in the UK were clear (well, where I live at least!) and gave good opportunity for some observing and astrophotography.
Though my first target was Mars, because the telescope was still ‘warm’ from only just being brought out from the house, this created poor ‘seeing’ from the small air turbulences inside the telescope as it cooled down. This created a shimmering blob effect that when coupled with 2 and 5mm lens, ruined the image.
Whilst I waited for the equipment to cool down, I decided on a bigger target that would be affected less by the aclimatisation problems. So I turned to the Moon and grabbed my Canon S2IS digital camera, holding it upto the eyepiece. Because I’d already worked out some test shots with aperture and shutter speed in CHDK, I applied the settings and managed to get the whole of the Moons disc in the eyepiece. One of the shots is pictured below, though I haven’t had chance to correct the rotation of the image so that the Moon looks the right way up. I had my Moon filter attached to the eyepiece and the only post-processing applied was auto-levels in Photoshop.
By this time the scope had cooled down sufficiently to view Mars. Even though I’d fitted various combinations of barlow lens, 5 and 2mm lenses, I couldn’t manage to quite get much surface detail imaged, except two horizontal curved bands, one of which I guess corresponds to the polar cap. There was a hint of red-orange colour around the edges of the sphere, I didn’t bother trying to try imaging it with my hand-held afocal coupling method of taking pictures with the camera, as I felt it it would result in a blurred image.
Instead, I fixed the camera to the mount on the telescope and took a shot of the Moon and Mars (which was directly overhead), displayed below:-
The image has been rotated and cropped due to the angle that the camera was viewing the scene. A small amount of red’ blue, brightness and contrast has been applied to the image.
Final shot for this post is the equipment setup:-
Mars is at closest approach to Earth for the whole of this week, before receeding until 2012.
Posted by Wordmobi