Not been able to set up the repaired M25C

With the current weather I have not been able to set up the repaired M25C for any imaging and I am aware of the days ticking past with nothing new to add 🙁  Still, this gives me a little time to sit down and plan the next phase of the mini-WASP array.  Unfortunately the mini-WASP will not be up and running for this winter, looks more likely that this will now be a winter 2011 first light.  I didn’t get the decking and concrete pillar base in ready for the observatory and I think it will now be spring next year before I get that part done, so this winter it will be Hyperstar III imaging only (which is no bad thing).  Got a few nice projects noted on the whiteboard – now I just need the weather to play ball.  Having said that, it is this time of the year that I have had a 3-month imaging break due to the weather on more than one occasion!

Returning to the mini-WASP project – this will need to go into its own observatory dome so that I can run both the Hyperstar III and mini-WASP systems at the same time.  The first phase of the mini-WASP will use 2 x Sky 90 scopes together with two of the new Starlight Xpress M26C one-shot colour cameras.  A Megrez 80 and SX guide camera will occupy one slot of the mini-WASP array for the guiding.

In phase II (unknown date!) two further Sky 90s and M26C cameras will be added to the two remaining mini-WASP ports and the Megrez removed altogether.  One of the Sky 90s will have an OAG (SX) for guiding.  So the final mini-WASP system will be a four Sky 90, four M26C system giving a field of view of 6 x 4 degrees (that takes into account the frame overlap) a sampling of 3 arc seconds per pixel and 40 megapixels of data per sub download (36 megapixels of non-overlapped data).  I think the final system will produce some quite impressive images 🙂


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Perseids meteor shower (Meridian News & Weather)


Copyright ITV Meridian News & Weather

Posted in News, Television and Radio | 2 Comments

Meridian TV at the New Forest Observatory

It was great to have Simon Parkin and the Meridian TV crew visit the New Forest Observatory – they are a very professional outfit and they make live broadcasting appear so easy!  So once again, the familiar shape of the satellite van parked on the verge outside the NFO attracted the usual attention – it really is an incredible piece of high technology – a film studio on wheels with satellite broadcast capabilities – amazing.  Simon gave the weather report and had a few words with me about the current Perseid meteor shower.  At least, with all the cloud, it didn’t actually rain on us 🙂

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Meridian News & Weather tonight

Keep an eye on Meridian News & Weather tonight from 6:00 p.m. onwards as you should see the New Forest Observatory and me discussing the Perseid meteor shower.  There may be a cameo appearance by Louey the black Labrador as well.

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Perseid from August 11th before midnight

I went over to what I thought was going to be a “dark” bit of the forest around 10:00 p.m. last night and got worse sky glow on the horizon (from Southampton) than I get in my back garden.  So the wife and I reccied another site about 3 miles away for future use and this one was quite a bit better – although there was the possibility of the odd car headlight giving low-level glare.  Anyway – came back home and set up in the garden again for a night of Perseid imaging.  It’s amazing that with a 180 degree FOV fish eye lens you can still see meteors that you don’t manage to image (usually because they run along behind the house – they have to have intelligence!).  Imaged for two hours and didn’t notice that it had got cold enough for dew to form on the fish eye lens, so the second hour’s imaging was a complete waste of time.  Visually, the display was reasonable but nothing particularly special – I seem to feel the same every Perseid session, I think I’m expecting a display from “The Day of the Triffids” and instead I get little more than you would expect on any dark, clear, Moonless night.  Not sure why I bother really.

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Perseid hunting tonight!

After a completely overcast day the cloud began to break up around 5:00 p.m. and now (9:00 p.m.) it looks like we might actually have a reasonably clear night.  Whooppeeeeeeeeee – I’m off over the forest with the AstroTrac Canon 5D and 15mm fish eye lens to grab some Perseids 🙂 🙂   There was just too much light pollution from the street lights in my back garden to do a proper job with this setup, so I’m going in a nice large flat field right next to our allotments to hopefully get some dark sky imaging.  I’ll report on the outcome of this evening’s efforts tomorrow – provided it stays clear long enough to get started.

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Camera returned, re-fitted and fired up – AOK!

Starlight Xpress returned the repaired CCD via Special Delivery just after lunchtime today!  I re-fitted it to the Hyperstar III and ran off a bias frame – Tom How confirms it now looks o.k. and we’re once again hot to trot 🙂  Thank you Michael Hattey and Terry Platt of Starlight Xpress for such wonderful service!!!  I can’t recommend SX highly enough for your deep-sky imaging CCD requirements (and filter wheels, and guide cameras, and AO systems, and ………….)

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On the cooler malfunction

Looking back over the images taken it appears that the cooler failed on January 17th 2010 – so nowhere near as long ago as I thought, and it wasn’t at the time the PSU went down.  The number of hot pixels dramatically increased in the images, and the noise may have gone up a tad, but apart from the hot pixels there wasn’t too much to show for it (apart from the extra unnecessary processing Noel would have had to have carried out 🙂 Interesting!  Down to the high speed of the Hyperstar and the short sub-exposure times.  If I worked at higher f-numbers the Peltier failure would have been more quickly recognised that’s for sure.

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The Starlight Xpress mega-service

My M25C one-shot colour camera had an open circuit Peltier cooler (see post below).  Packed it and shipped it off Recorded Delivery yesterday (Monday) around 1:00 p.m.  Just got a mail from Michael Hattey 4:30 p.m. today (Tuesday) that it’s been fixed and is ready to be shipped back.  How’s that for fantastic service!

This is one (major) reason why I wouldn’t even consider a CCD camera not made in the U.K.

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Thank you Tom How (Curdridge Observatory)!!!

Today it was brought home to me just how dangerous it is to work on your own in this imaging business.  Tom How is a local guy and an imaging expert, and we only recently realised that we hadn’t met up for (too many!) years.  So Tom popped over to Brockenhurst this morning to see what I had been up to in the intervening years.  Tom also educated me about darks, bias frames and flats, something he has spent a lot of time on getting properly sorted out on his system.  It was when he showed me the bias frame from my M25C that he immediately knew that something was wrong with the camera – there was a large top-to-bottom gradient.  As I’ve never looked at a bias frame before it meant nothing to me.  However – it did kick me into action – and the long and the short of it is that (after mailing Terry Platt) it looks like the Peltier cooler is open circuit.  I have no idea how long the CCD hasn’t been cooled, but I suspect it goes back to when the power supply gave up the ghost a couple of years ago!!  Blimey – Noel and I have been turning out some pretty nice images without a cooled CCD.  We were getting a bit cheesed off with the hot pixels mind you – and I was very surprised (after having used the H9C for a few years) that I couldn’t do a decent job on CTB1, the supernova remnant in Cassiopeia.  Now we know why!!  So it is a trip up to Starlight Xpress ASAP for some surgery on the M25C and hopefully we’ll see a big leap in image quality brought about by some decent chip cooling!!  If Tom hadn’t popped over and pushed me along to see about bias frames and the like I would have carried on in ignorance.  This is the risk you run if you work on your own in this technologically demanding hobby 🙂


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