It was a good night. Got up about 3:45AM 8/31/2013CDT and timed about 20 total occultations over the next more than 2 hours. Two of these were known doubles but I had a nice suprise toward the end with a likely double star discovery of XZ93450! I was using my home made 18" newtonian at prime focus (F6) using a Watec 902H2 ultimate camera and IOTA-VTI.
This may be pretty dry stuff for many people but these discoveries (about 20 so far) sure keeps me interested and really helps justify my toys!
I also want to say that I used Occult 4.1 and LiMovie. Can't thank them enough for the wonderful freeware!
This first capture shows an appoximatly 11.8 magnitude companion to
XZ 93450 (TYC1335-114). It was visible for about 0.13 seconds.
This capture below shows the combined light of the two stars at 9.4Mv magnitude.
The light curve graph shows the steps as the stars reemerge from behind the Moon. With it we can get an approximte magnitude for the companion and if another observer or observers were capable of recording this event far from me at another position on the Moon limb a position angle for the two stars can be determined.
Guestimating the values for the faint star and the combined light of the two and knowing the combined magnitude for the two stars, using the Magnitude Calulator in Occult we can get the approximate magnitudes for the stars, 9.53 and 11.79
Another star that reappeared from behind the Moon was ZC1040. A known close double.
"1040 is double: AB 6.61 8.04 0.22" 159.0
1040 is a close double. Observations are highly desired"
The graph shows the brighter component R'd (reappeared first)
The 3D star image from LiMovie shows the star did not saturate the camera. The star was bright at magnitude 6.4 so I used a pillow case over the front of the scope to cover most of the aperture to help avoid saturation for this star only.
Another known double SAO96090. The Moon was lowest for this one so the seeing was not as good. We will probably not get any worthwhile photometry from this recording but the timing is still good to get a better PA (position angle) of these two stars.
96090 is double: AB 8.9 9.1 0.38" 182.4
96090 is a close double. Observations are highly desired
Lunar occultations 8/31/2013