Bolton Astronomical Society
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Show & tell, 1st November
http://www.boltonastro.co.uk/forums/viewtopic.php?f=3&t=908
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Author:  rwilkinson [ Sat Oct 29, 2016 3:06 pm ]
Post subject:  Show & tell, 1st November

I can talk about (and maybe demonstrate) a couple of things which I've been working on recently:
  • A home-made anti-dewing system
  • Can I detect a 14th-magnitude comet using a 70mm 'scope?

Any more offers?

Author:  dean_kos [ Sun Oct 30, 2016 8:12 am ]
Post subject:  Re: Show & tell, 1st November

Yea I can do a bit on using a fisheye lens......pro's and con's

Author:  DRatledge [ Mon Oct 31, 2016 5:03 pm ]
Post subject:  Re: Show & tell, 1st November

I can give an update on the ADC - the mark2 version..........

Author:  CEtherington [ Mon Oct 31, 2016 10:25 pm ]
Post subject:  Re: Show & tell, 1st November

Hiya. I can do a couple of minutes on the exhibition idea. Also I have a mystery gift for the society.....

Author:  rwilkinson [ Wed Nov 02, 2016 10:09 am ]
Post subject:  Re: Show & tell, 1st November

rwilkinson wrote:
I can talk about.. a 14th-magnitude comet..
Well, as I explained last night, it was more like 15th magnitude.

Then after I got home from the meeting I could see that the constellation of Auriga had risen above the trees, so I was able to have a go at it from my garden, using my preferred comet-imaging kit (an old StarlightXpress camera on my focal-reduced 8" SCT):
Attachment:
File comment: Comet 226P on 1-Nov. 13x 90-sec with MX716 on C8 at f/3.3.
226p_1nov.png
226p_1nov.png [ 222.92 KiB | Viewed 2482 times ]
This is a rather better result that I'd managed last week with the 70mm 'scope - so the gain of the longer exposures and larger optical system outweighed the increased light-pollution (and my LPR filter) plus the hazy cloud which came over during my imaging (so I had to omit some of the sequence from my stack - hence the gaps in the star-trails).

Author:  bbones [ Wed Nov 02, 2016 10:40 am ]
Post subject:  Re: Show & tell, 1st November

That's brilliant, your expertise using IRIS pays off... Much do more myself

Author:  rwilkinson [ Wed Nov 02, 2016 3:36 pm ]
Post subject:  Re: Show & tell, 1st November

rwilkinson wrote:
I can talk about.. a home-made anti-dewing system

If anyone would like to make one of their own, this is a source of the "Heat-trace" cable:
http://www.ebay.co.uk/itm/12w-m-TRACE-HEATING-CABLE-LOW-VOLTAGE-12v-FROST-PROTECTION-price-p-m-/390986887824
and the power-controllers which I mentioned:
http://www.ebay.co.uk/itm/DC-12V-8A-LED-Light-Protect-Strip-Dimmer-Adjustable-Brightness-Controller-ZY-/142161210561

And here's a previous discussion with references to Constantan and Nichrome wires:
http://www.boltonastro.co.uk/forums/viewtopic.php?f=6&t=366&p=1344

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