Warm Astronomy – first attempt.

So, the clocks have gone back, the dark evenings are here and (when the clouds and rain leave us alone) there’s some great stargazing to be done. Within reason I’m quite happy to get my thermals on and put up with a bit of cold to enjoy the show, but I also like to share (inflict?) my hobby with my nearest and dearest and my chances of getting them outside in this weather for any length of time are pretty slim. Over the summer I’ve been good friends with eBay and have picked up some bits and pieces to enable me to bring the hobby indoors.

The kit I’m using is: HEQ5 Mount, Skywatcher 130P-DS, ZWO ASI224 Camera (with an LP filter) and a laptop running Cartes du Ciel (I know lots of club members like Stellarium, but my geriatric laptop doesn’t!) to control the mount, SharpCap to run the camera and TeamViewer to control the laptop remotely (I tried using Remote Desktop, but Windows wasn’t having any of it).

First chance to use it came up on Sunday night- full moon or not! Altogether it took about half an hour to set up (hopefully this will drop with practice). Pictures below show the setup (complete with frost) and then images of what we could see in the session. Whilst we were running I saved the captures and later stacked them along with a dark stack (not sure I’ve got this bit right) and did a histogram stretch- these are shown alongside.
Altogether, it worked well- both being able to easily show images and the novelty of pointing at something on screen and then images of it appearing a minute or two later. Some friends popped over and they were quite taken with being able to all see it at the same time and discuss rather than taking turns at the eyepiece and being unsure of what they were seeing.

The brighter objects were certainly better- the targets we looked at were:
Albireo – right image is 15 x 10s exposure.
M57 Ring Nebula – right image is 15 x 30s exposure.
M27 Dumbbell – right image is 30 x 30s exposure.
M15 – Globular – right image is 35 x 30s exposure.

Gain was set to 300 throughout. I also tried the Double-double, which became the Single-single and M81 which just came out as a blob- I think this and the Dumbbell might work out better with a bit less moonlight. Overall it was a really successful evening- the setup time is a bit of a pain compared with the 5 mins it takes to set the Dob up (and that includes making a cup of tea!), and it lacks the magic of finding it yourself and seeing with your own eyes. But for sharing with others it’s brilliant, and later on I even managed to get my month-end books done with the scope still on which made that task less of a drag than usual!

Oh- and thanks for the earlier post in the blog about using old storage boxes to protect your laptop/shield the light from its screen- worked a treat!


1 Response

  1. Superb results Rob (good focus and the scope appears pretty well collimated).

    Nice selection of targets too.

    I’ve added the Ring Nebula shot to the upcoming November presentation to illustrate a slide!


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