[AZ-Observing] Re: Images of International Space Station Moon Transit
- From: Padraig Houlahan <pjhmx1@xxxxxxxxx>
- To: "az-observing@xxxxxxxxxxxxx" <az-observing@xxxxxxxxxxxxx>
- Date: Fri, 18 Oct 2013 05:53:56 -0700
Amazing!
Sent from my iPhone
> On Oct 18, 2013, at 1:36 AM, Tom Polakis <tpolakis@xxxxxxx> wrote:
>
> Jenn and I set up the equipment at the north end of Meridian Rd., in a
> parking lot for a trailhead that goes into the Usery Mountains.
>
> Here are some images of last night's ISS transit of the moon taken with Canon
> 50D camera mounted to a TeleVue 101 refractor. A 2x Barlow brought the focal
> length to roughly 1100 mm at f/11. Since the shutter speed has to be at
> least as fast as 1/2000 sec, the ISO needed to be 800 to make the image
> acceptably bright.
>
> Since the sensor in the 50D is rather large, the frame rate at its fastest is
> only 6 frames per second. This image is a composite of the four frames that
> captured the ISS during its 0.6-second transit. The image is scaled down to
> fit the moon on an average computer display.
>
> http://www.pbase.com/polakis/image/152939476/original
>
>
> These two images are not scaled, rather they are full-sized crops at the
> native image scale.
>
> http://www.pbase.com/polakis/image/152939477/original
> http://www.pbase.com/polakis/image/152939480/original
>
>
> Next to the TV101 was the 10" f/5.5 recording a very tiny portion of the moon
> at prime focus with the webcam at 60 frames per second. While CalSky
> predicted the ISS to pass right over the crater Tycho, in fact it missed it
> by several arcminutes, putting it outside the frame of the chip.
>
> Tom
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