March 2019 – Crayford Manor House Astronomical Society Dartford

A DSLR Cooler

31st March 2019

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DSLR Cooler box

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A DSLR, ideally one that has been modded to remove the filters is an accessible way to begin imaging, and I have successfully imaged using a 'full spectrum mod' Canon 600D for many years.

Unfortunately these cameras are not cooled and the sensor temperature (measured by the camera) runs about 15 degrees above the ambient air temperature. You can find cooled DSLR's but these are very expensive, however by simply putting the DSLR into a box and cooling the box using a peltier cooler it is possible to cool the DSLR without any modification to the camera, delivering measurable improvements in noise.

Parts:

All parts are readily available on Amazon

Water proof electrical case
Expanding builders foam
Peltier cooler

The approach is not unique, my cooler box was based on the design here

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DSLR Cooler Box

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Open Cluster, M46, NGC2437

31st March 2019

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Messier 46 also known as NGC2437 is an open cluster discovered in 1771 by Charles Messier. it is a very bright and very rich open cluster of about 500 stars and as a bonus the planetary nebula NGC 2438 appears to lie within the cluster near its northern edge, but in reality it is most likely unrelated.

If you are looking at M46 why not also have a look at M47.which is only about a degree west of M46, so the two fit well in a binocular or wide-angle telescope field.

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Images by Neil Webster

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M46 NGC 2438

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All images are copyright. Permission must be sought to from the image owner to the use of any of these images.

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Images of Jupiter by Martin Crow

24th March 2019

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Images of Jupiter by Julian Tworek

24th March 2019

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Jupiter Images by Gordon Collins

24th March 2019

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Jupiter Images by Andy Barber

24th March 2019

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Jupiter Images by Andy Smith

24th March 2019

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Jupiter Images by Honor Wheeler

24th March 2019

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Jupiter Images by Simon Dawes

24th March 2019

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Parhelia (Sun Dogs)

20th March 2019

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Sun dogs are a common bright circular spot on a solar halo. It is an atmospheric optical phenomenon primarily associated with the reflection or refraction of sunlight by small ice crystals making up cirrus or cirrostratus clouds. Often, two sun dogs can be seen (one on each side of the sun) simultaneously.

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Jim Burchell's Images

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Terry Miles' Images

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Honor Wheeler's Images

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Images by John Howarth

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I must admit that the picture does have a certain surreal quality, which will hopefully make up for any lack of scientific weight! When I first saw the mock-sun I genuinely thought for an instant that it was the real one behind high cloud, but then realised that it was in the wrong direction and the real sun was going down behind the houses on the right!

It was taken 4 January 2019 at 1427UT with an Alcatel One Touch Pixi 3 (not my choice of name, but so be it) Model 4009X and was allegedly 1680x1120 pixels before JPEG compression. It hasn't been processed in any way.

The location was about halfway along Eastry Road, location 51deg 28' 33"N, 0 deg 9' 3"E to the nearest 100 feet or so.

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The parhelion (to left) was visible from Bexleyheath train station at 1646hrs today 18th March 2019. The sun is partly obscured by the tree in both pictures. There was no parhelion on the right hand side of the sun.

The camera was in a Samsung GT-E3210B mobile phone, which was all that was to hand at the time.

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