You are not logged in. [Login] Entrance · Main Index · Search · New user · Who's Online FAQ · Calendar

Observing >> Double Star Observing Previous   Index   Next   Threaded

Pages: 1 StarDusty sage Reged: 10/02/07 Loc: Parsippany, NJ 18455+0530A STF2375A HR7048       #5486258 - 10/23/12 11:29 PM Attachment (50 downloads) Edit   Reply   Quote Quick Reply   Attached is a capture summary plate for STF2375A. I measured the PA and Separation using REDUC using one drift and two separation avi files. Video files were recorded using a monochrome Imaging Source camera imaged through a home made 4" f/28.5 Schiefspiegler with no barlow. Post Extras:       Cotts Just Wondering Reged: 10/10/05 Loc: Toronto, Ontario Re: 18455+0530A STF2375A HR7048 [Re: StarDusty]       #5486676 - 10/24/12 09:19 AM Edit   Reply   Quote Quick Reply   Dusty, I am in the infancy stages of doing what you are doing. What image scale, in arcsec per pixel are you working at for your set-up? It is most impressive that you're getting good data for a pair so close (only 3x your Dawes limit). I will be doing this with my 6" f/8 APO barlowed to f/16 (2400mm). I haven't obtained REDUC yet. Dave Post Extras:       WRAK sage Reged: 02/18/12 Re: 18455+0530A STF2375A HR7048 [Re: Cotts]       #5486864 - 10/24/12 11:48 AM Edit   Reply   Quote Quick Reply   Amazing - magnification this high without any hint of a diffraction pattern, not even of the first ring. Wilfried Post Extras:       PJ Anway Carpal Tunnel Reged: 06/04/03 Loc: North Coast Re: 18455+0530A STF2375A HR7048 [Re: StarDusty]       #5487072 - 10/24/12 02:03 PM Edit   Reply   Quote Quick Reply   Very nice! 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: 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 Post Extras:       StarDusty sage Reged: 10/02/07 Loc: Parsippany, NJ Re: 18455+0530A STF2375A HR7048 [Re: Cotts]       #5488487 - 10/25/12 11:53 AM Edit   Reply   Quote Quick Reply   Cotts, 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. Post Extras:       Ed Wiley professor emeritus Reged: 05/18/05 Loc: Kansas, USA Re: 18455+0530A STF2375A HR7048 [Re: StarDusty]       #5498320 - 10/31/12 07:24 PM Edit   Reply   Quote Quick Reply   Very nice, Dusty. You have an interesting way to determine plate scale. I use either calibration pairs or rectilinear pairs for plate scale and drift for camera orientation. do you plan on publishing your data? 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. Ed Post Extras:       Pages: 1

Previous   Index   Next   Threaded

Extra information 2 registered and 5 anonymous users are browsing this forum. Moderator:  PJ Anway, RLTYS  Print Thread Forum Permissions       You cannot start new topics       You cannot reply to topics       HTML is disabled       UBBCode is enabled Thread views: 679 Jump to *Announcements and News* -----   Cloudy Nights Announcements   Discussion of CN Articles, Reviews, and Reports   Celestial Events*General Astronomy* -----   Beginners Forum   General Observing and Astronomy   Outreach   Light Pollution*Equipment Discussions* -----   ATM, Optics and DIY Forum   Binoculars   Binoviewers   Cats & Casses   Classic Telescopes   Equipment   Eyepieces   Mounts   Observatories   Reflectors   Refractors    Video and Electronically Assisted Astronomy*Astrophotography and Sketching* -----   Beginning and Intermediate Imaging   Film Astrophotography   DSLR & Digital Camera Astro Imaging & Processing   CCD Imaging & Processing   Solar System Imaging & Processing   Sketching   Astro Imaging/Sketching Contest *Observing* -----   NEO   Planetary and Solar System Observing   Lunar Observing   Deep Sky Observing   Double Star Observing   Solar   Variable Star Observing and Radio Astronomy*Telescope Specific Forums* -----   Celestron NexStar    NexStar GPS / CPC Telescopes   Questar Forum   Meade ACF/RCX / LX / GPS    Meade ETX*Speciality Forums* -----   Arizona Science and Astronomy Expo   NEAF (Northeast Astronomy Forum) and NEAIC (Northeast Astro Imaging Conference)   AstroArt   Astronomy Clubs and Star Parties   Astronomy Software & Computers   AstroWebsites   Science! Astronomy & Space Exploration, and Others   Space Rocks   Stellar Media*Swap and Shop* -----   Shop and Swap Audio Components*CN Feedback and Vendor Announcements* -----   Vendor and Group Announcements*International Year of Astronomy 2009 - Forums are now closed.* -----   IYA Archive Info

CN Forums Home