Nice ISS transit, May 31
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Nice ISS transit, May 31
I caught a nice ISS transit this morning! This was my first successful one, and I'm super happy with the detail visible on the space station -- helped by fast exposure and zenith pointing. I like how it looks next to the ARs (3317 + 3318), with the prom's above.
The proper exposure time for the Sun would have been ~5 msec in my Lunt 80 + ASI1600MM, but that would have ended up with a lot of motion blur from the ISS, which crosses the solar disk in < 0.5 sec. Doing some quick calculations I ended up at 0.5 msec. To get good images at a short exposure I removed the DS module (which not only makes things darker, but also occults because it's a 60mm DS on an 80 mm scope -- plus it reduces the resolution). I then took full-disk images of the transit at 50 fps, which was apparently too fast, since I dropped a couple of frames along the way. Right after the transit I put the DS module back on and took some 5 msec DS images to stack for the background. I merged them all in PS.
Hankk
The proper exposure time for the Sun would have been ~5 msec in my Lunt 80 + ASI1600MM, but that would have ended up with a lot of motion blur from the ISS, which crosses the solar disk in < 0.5 sec. Doing some quick calculations I ended up at 0.5 msec. To get good images at a short exposure I removed the DS module (which not only makes things darker, but also occults because it's a 60mm DS on an 80 mm scope -- plus it reduces the resolution). I then took full-disk images of the transit at 50 fps, which was apparently too fast, since I dropped a couple of frames along the way. Right after the transit I put the DS module back on and took some 5 msec DS images to stack for the background. I merged them all in PS.
Hankk
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Re: Nice ISS transit, May 31
Fantastic catch (with good planning!).
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Re: Nice ISS transit, May 31
Great catch!
Warren
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Lunt LS60T DS
Orion ED80T CF
Meade ETX LS6
Lunt CaK BF1200
Lunt WL Wedge
Baader Photographic Film
ASI174MM
Skyris 236M
Player One Saturn-M SQR
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Re: Nice ISS transit, May 31
WoW, Very nice!!
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Orion 70mm Solar Telescope
Celestron AstroMaster Alt/Az Mount
Meade Coronado SolarMax II 60 DS
Meade Coronado SolarMax II 90 DS
Meade Coronado AZS Alt/Az Mount
Astro-Tech AT72EDII with Altair solar wedge
Celestron NexStar 102GT with Altair solar wedge
Losmandy AZ8 Alt/Az Mount
Sky-Watcher AZGTI Alt-Az GoTo mount
Cameras: ZWO ASI178MM, PGR Grasshopper, PGR Flea
Lunt, Coronado, TeleVue, Orion and Meade eyepieces
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Re: Nice ISS transit, May 31
That's an excellent view! Nicely done.
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Re: Nice ISS transit, May 31
Very nice indeed, Hankk.
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Fluxgate Magnetometers (1s and 150s Cadence).
Radio meteor detector.
More images at http://www.flickr.com/photos/solarcarbon60/
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