Archive for the “Deep Space Objects” Category

I am in the final stages of setting up a new imaging system based on a Canon 200mm prime lens with M25C OSC imager and a 52 mm IDAS filter on the front of the lens giving me f#3.85 and spikeless images :)  As it is that time of the year an obvious target for testing out the star imaging qualities of the rig is the Double Cluster.  With a horrendous sampling of 7.97 arcseconds per pixel it makes you wonder how it can even resolve stars – but clearly it does :)  Above the Double Cluster we see the rarely images Stock 2 open cluster, which looks like a stick man on his side.  And at the very top/left you can just see the edges of the Heart & Soul nebulae.

Only 16 x 5-minute subs for this one, and very misty conditions too, a LOT of water vapour in the air – however, as a bonus, there was no Moon.

I think this is going to make a good rig for those BIG winter nebulae.  It is NOT a good rig for those single bright star shots as there are terrible ghost flares from very bright stars, probably resulting from all that glass in the 200mm lens.  Well you can’t have it all I guess.

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In putting together the next book “Experimental Photography” I came across some unprocessed data from a while back.  It was Carbon star V623 Cassiopeiae or SAO23858 – a very nice Carbon star lying just below Pazmino’s cluster in the constellation Cassiopeia.

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A number of people have asked me how many stars appear in the Cocoon nebula 3-frame mosaic.  I use a program called Registar to link separate frames together so I can see how they all fit – and Registar will also do a “star count” for the stars in the image (I don’t think it is accurate to the level of a star :) )  Anyway – Registar says there are 68,200 in this image – always turns out to be a LOT less than you would guess.

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This pair of open clusters has a Milky Way backdrop and they are surrounded by faint emission nebulosity.  They can be found in the constellation Cygnus lying just underneath the Crescent nebula region.  Image taken 19th August 2009 using the Hyperstar III – 22 sub-exposures at 5-minutes per sub (equivalent to 30-minute subs on the Sky 90).

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I have no idea why I took this image of a galaxy group in Bootes on January 29th 2011.  I also have no record of it in the logbook.  I ran an astrometry check on it to find where it was – the bright star near the middle is magnitude 4.80.  Apparently this is 19 sub-exposures at 10-minutes per sub, so for some reason I spent 3 hours of good imaging time on this one – if only I could remember why :)

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According to the Guiness Book of Records this Quasar in the constellation Lynx is the brightest known object in our universe and who are we to argue with them [oops – see the Postscript below]! Read the rest of this entry »

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