B352 - Dark nebula in Cygnus - LLRGB 4 hrs total exposure

Dear friends ... and one of the webmasters,

I used the opportunity last night to pursue another interesting dark nebula also in Cygnus. Due to transparency problems, I think the colours may not be perfect and, as a result, a repeat visit would be wise.

For a glimpse at the effort from last night, please see www.perseus.gr/Astro-DSO-Nebulae-Dark-B352.htm .... there is over 5000 stars in this particular image and in spite of the fact that a portion of the field of view is devoid of them (ie. the dark nebula itself).

Back at it again this evening for a similar exercise before all hell breaks lose over the weekend and the extremely high temperatures.

5000 stars Anthony? How long did it take you to count them all?

Great image.

Paul

27.8 degrees in the middle of the night?
Phew.

Its actually chilly here here today at noon Anthony.
If the clouds got out of the way it would not even be dark!

Jealous.

Peter.

Hi Peter,

It is at least ten degrees higher during the day. Furthermore, I suspect this evening will be my last for at least a week due to the high temperatures, for I am having difficulty getting the CCD temperature below zero.

I have to get a small aquarium pump so as to exploit the water-cooling option available with my camera and which gets me a further 10 degrees below ambient.

We are expecting 40d C this weekend .... since the camera goes to about 35d C below ambient, I may have some undesired time off following this evening. Damn it! :evil:

The nearest cloud to Greece today is about 1000 km away!
See:
www.meteo.fr/temps/europe/satellite/bigsateuj_00.jpg

I may apply for asylum in Greece.

Peter.

I would melt away in 40 degrees.
Such extremes were never recorded in Ireland outside greenhouses.
(40% of the way to the temperature of boiling water!)

Why not make a "Cold Room" for your optical equipment Anthony.

No expensive Air Conditioners required.

Take the door off a cheap refrigerator .
Isolate the front from the back so that the heat does not come back into the room.
Face the front into the (small, heat insulated) room where your telescopes are.

Voila !

Cool,bone dry, optics always.

(Covered in dew in minutes in the open air of course! Astronomers never win.)

Peter.