From: Ron Pearson <ursamajor_1@mac.com>

Date: October 18, 2017 6:24:43 PM MDT

To: Astro_IIDC@yahoogroups.com

Subject: Re: [Astro_IIDC] Re: Rare dual solar and lunar ISS transit

thanks Jim,   this is not a dual transit, just the Moon - I suspect thats a pretty rare event!   Ron

On Oct 18, 2017, at 5:12 PM, Jim Chung jim_chung@sunshine.net [Astro_IIDC] <Astro_IIDC@yahoogroups.com> wrote:

It's quite visible even in the daytime sky - if the Moon is low then 
an IR pass filter might be very helpful.

Good luck. We need more dual transit images to pique interest from others!

Jim

Quoting "ursamajor_1@mac.com [Astro_IIDC]" <Astro_IIDC@yahoogroups.com>:

> Hi Jim,
>
> i was looking at your ISS-Moon transit image again and wondering 
> how easy (or not) it was to pick up in the ISS in daylight? I have 
> a ISS-Moon transit near me, thats predicted for this Sat. around 
> 5:45pm so it will be in daylight with Sun also low in SW. This will 
> be a very thin crescent Moon however. So not sure its worth 
> chasing. Thinking I could maybe use my IR pass filter to darken the 
> blue sky but maybe cuts too much white light. Thoughts? and 
> thanks. Ron
>
>
> ---In Astro_IIDC@yahoogroups.com, <jim_chung@...> wrote :
>
> Hey everyone!
>
>
> Not sure how rare this event is, obviously both the Sun and the 
> Moon have to be in the day sky together so that does limit how often 
> this phenomenon can occur, and rare in that it occurred on a weekend 
> and on a nice day as well!!!
>
>
> Since I've taken a few solar and lunar ISS transits in the past, 
> I'm not so inclined to keep doing it but this dual transit caught my 
> attention and motivated me to try it again.
>
>
> So I had to drive about 5 km in the city to get on the centerline 
> and as usual I was in a hurry and wanted to take the bare minimum of 
> gear since that's less to setup, cleanup and lose. So I figured I'd 
> take just one scope, my dual stack 40mm Coronado solar scope, and 
> image the Moon in Ha as well.
>
>
> Caught the Solar transit at 8:20 and slewed to the Moon. Could 
> not see a damn thing. Of course not. Cuz the bandpass of a solar 
> scope is way tighter than narrowband Ha filters and there's the 
> additional blocking filters and IR blocking filters in the diagonal 
> too. I removed both etalons but instead of a normal refractor, the 
> Coronado has the lens objective screwed to the tilting mechanism of 
> the first etalon. Plus the draw tube could not extend far enough to 
> get the camera or eyepiece into focus without a diagonal in the 
> optical train.
>
>
>
> Good thing I had over an hour to try and salvage this opportunity, 
> I ransacked the car to see what materials I could use. Found my 25 
> year old first aid kit that has followed me from car to car to car 
> and while the insulating foam rubber has decayed to powder and all 
> the meds had followed suit, the sealed wound closure strips were 
> still very sticky and could serve as ersatz duct tape!!
>
>
> So I wrapped several layer of strips around the lens objective so 
> that it could be jammed into the front of the scope in a position 
> several centimeters ahead of its normal position to bring the focus 
> point forward and taped a B&W red filter in front to lower the light 
> intensity and sharpen the image of the low setting Moon. By placing 
> the camera at the very tip of the focusing draw tube, I just managed 
> to achieve focus. I had 20 minutes to spare, so I did some public 
> outreach and solicited some potential RASC members from curious 
> people in the parking lot.
>
>
>
> Here's the Coronado scope rigged for visible light:
>
>
>  https://www.dropbox.com/s/lxgf5boy986fjnw/P1000693.JPG?dl=0 
> https://www.dropbox.com/s/lxgf5boy986fjnw/P1000693.JPG?dl=0
>
>
>
> And what we've all been waiting for, the first dual ISS transit 
> taken with PGR Grasshopper ccd and ASTRO IIDC (and maybe the first 
> dual transit ever imaged):
>
>
>  https://www.dropbox.com/s/x1vmf798hjb21ia/ISSDualTransit.jpg?dl=0 
> https://www.dropbox.com/s/x1vmf798hjb21ia/ISSDualTransit.jpg?dl=0
>
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