18455+0530A STF2375A HR7048
Posted 23 October 2012 - 10:29 PM
Posted 24 October 2012 - 08:19 AM
I will be doing this with my 6" f/8 APO barlowed to f/16 (2400mm). I haven't obtained REDUC yet.
Posted 24 October 2012 - 10:48 AM
Posted 24 October 2012 - 01:03 PM
Akira Inaka has this one on his site. If you have never been there, it's well worth visiting; though navigation takes a bit of practice.
Here is the link:
To find STF2375:
(1) Click on Constellations tab
(2) pink = Spring Constellations
green = Summer Constellations
orange = Fall Constellations
white = Winter Constellations
Click on the Summer Constellations (green)
(3) Click on Aquila
(4) Click on object #10 in the star field
Posted 25 October 2012 - 10:53 AM
My image scale is 0.39 arc-sec/pixel for my Schiefspeigler with no barlow.
Since I made this telescope, I am able to estimate its actual focal length fairly closely which in turn can be used to calculate the image scale.
I have verified image scale for this and my other telescopes by recording the drift of doubles and other stars with GEM tracking halted. I used LiMovie to estimate the frame by frame pixel position of the star as it drifts across the CCD chip. Using the time between frames and the number of frames, image scale can be determined. [You also need to know the Declination.] LiMovie has the ability to export x,y pixel positions for as many as three stars for each frame of the avi file. This is a comma delimited file that Excel will import.
Posted 31 October 2012 - 06:24 PM
I have just submitted a paper on the use of high-speed data capture and the REDUC interferometry routines to obtain data on close pairs. It is not true interferometry but what I am calling "pixel autocorrelation." It should work on scopes that are too small to capture speckles. It would be interesting to see how a 4" scope would perform and you have a very nice one at the right F-value.