These images are from the night of the occultation on Jan 26-27.
There is an image of the area of the moon which was to be targeted
by Aldebaran. The first one with Aldebaran visible in the field
is at 23 04 30, the last is at 23 21 06.
The weather deteriorated markedly and the last images are very
under-exposed. The moon disapeared completely 10 minutes after
the last image which was just before occultation. Reappearance
later that evening was in turn occulted by the next storm moving
in to keep us company.
The scope is stopped down to about 3 3/4" with the use
of the Optec F3.3 focal reducer. Because the focal reducer makes
the system so fast photographicaly it is impossible without an
aperature mask to have the shutter speed fast enough to avoid
over-eposure of the CCD chip when imaging the moon. A filter is
another solution to this problem. The mask probably could have
been removed as the clouds moved in but it was tempting simply
to increase the exposures slightly instead. These ranged from
.02-.05 seconds. With a transient event such as an occultation
I'm hesitant to change too much on the fly for concern of losing
the event when it occurs. With the weather as it has been it was
lucky to do any imaging at all. It is captured with MaxIm DL software
and processed slightly then finished in Adobe Photoshop 4.1.Photoshop.The
images were unbinned but reduced in size after processing. The
scope is a Meade LX200 12" and the camera is a Pictor XT
416.
Click on any of the thumbnail images to see the
original images
Click on any of the thumbnail images to see the
original images |