Hi all,
I captured my first asteroid occultation last night. As previewed in the July issue of AS&T (p.58), Emanuela passed in front of the star HIP 94645 at about 6:54:30 pm. I drove to a spot just a few km south of the Amberley air force base, and set up my Canon 50D and 70-200mm telephoto lens, capturing a series of 1 sec exposures at f/4 and 3200 iso. Based on these images, the occultation lasted for about 7.5 seconds.
Here's a short star trail image consisting of about 1 minute of 1 sec exposures stacked using star trails. You can clearly see the gap in the trail of HIP 94645, where the star disappeared behind the asteroid.
There's also a 4 mg animation of the occultation here:
http://farm3.staticflickr.com/2880/9...70728149_o.gif
Hopefully a few other people measured the occultation as well, so that we can get an measurement of the asteroid's size and shape!
Cheers,
Stephen