Why is it some nights feel colder than others when the thermometer says otherwise?

I suppose last night did have a persistent east wind and as I started at 4pm and ended at 2am I was outside for a while, though I did sneak inside for coffee, biscuits and to generally thaw out. There was an astonishing dew fall which froze into thick layers on the car. Water was dripping off the tube and it took 2 dew heaters to keep the corrector plate clear (not entirely successful).

Not a great night earlier on - a little hazy - but it did get better after midnight.

Revisited Gyulbudaghians's, McNeil and Hind's nebulae. Didnt spend as long as I would have liked on any of them, but probably enough to see whats going on and say its no different from Mike Harlows latest results. Also captured M71 in twilight while waiting for dark - though thats just a bit of fun.

Finally got round to having a go at C2017 K2 again. Used a Celestron 11" RASA with a Starlight Xpress Trius 694. No binning, so 1.5 arc secs per pixel. No filter. Moonless sky. Light cirrus and sky brightness mag 20.5.

The comet looked pretty symmetrical to me, but very obviously not a star.

Sorry. While sorting some old images I came across these and had a nostalgic moment. :)

A nice night last night.

Managed to spend a little time looking at McNeil's nebula again before Orion starts to vanish into the spring evening twilight. To a cursory glance, its gone but, as previously seen, there are very faint hints of the nebula visible in a sum of 58x60s images. At that altitude and with an 11" and Trius 694 CCD used, the image must be reaching stars in the region of 19-20th magnitude range, so its not a lot to write home about. Perhaps thats what is normally there when the nebula is quiet. Wish I had spent more time dithering the image and also on the focus - it seems to have slipped over the observing session - probably after I imaged a comet at 7 degrees altitude...

Alas, this evening is also nice - Mercury particularly clear from here - but DIY has left my back shot, so while its a shame to waste it, tonight is an evening of image processing for me... 

Gyulbudaghian's nebula as seen on a very windy night. The wind was howling roiund the RASA and on occasions you wondered if you needed to hang on to the roof or watch it blow away. So, anyway, I stuck with 20s exposures and even then some of the images are a bit blurry. Gives a feel for the approximate form at the moment though.

Later in the evening I went over to 60s frames and had a look at Comet 64P/Swift -Gehrels. Easy to image but no obvious tail.

The field of NGC1275 was pretty impressive too. Loads of galaxies. Very rich area. Unfortunately as I was fighting the wind a lot of the time (must be me age)  I didnt get the chance to sort out a flat - so this is just the central portion of the image.

Similarly for IC1613, the local group galaxy was worth a look. I've been meaning to image it for years, but never got round to it. Must start imaging mor of the deeper local group galaxies. This was a bit like IC10 - a bit bright too be a challenge - though it is a bit bigger than IC10.

Finally managed to get a night out after a miserable few weeks of cloud.

The wind was howling though, so some images are a tad blurred (went down to 20s exposures at one point to reduce the failure rate) and the wind made it freezing (it was 1C) so I should perhaps have checked the focus more often. 

Either way got some useful stuff.

While working out how to use Virtual Dub (sounds like a Bob Marley record from the 70's) I came across a bunch of pics from La Palma. Its pretty difficult to take a bad picture there. So heres one...