We tested the imaging platform on the mobile set-up (see last post). Obviously it's going to be more of a challenge without tracking, but with a 60+/sec frame rate I can shoot 10 seconds and apparently still get halfway decent images. I took a quick and dirty mosaic yesterday mostly to see where 'North' on the Sun was on my laptop screen. This will tell me where to look for Venus at the start of the transit. I used the photospheric image from SOHO and compared the sunspot groups. There are 3-4 that popped up so it was fairly easy to match them up. After creating the match and marking out north on the Sun, I then switched to the view I have on my laptop screen during image capture. I now have the information I need for next week!
|SOHO image from 5/28. By convention North is up|
|HA Sun mosaic with mobile set-up-compare to above image from SOHO. This is slightly rotated to the East but otherwise is the true orientation of the Sun .'T' marks approximate location of Venus at start of transit|
|This is the orientation of the Sun as seen on the laptop screen at the time of capture- we predict that Venus comes in from the upper right in this view!|