- This topic has 6 replies, 3 voices, and was last updated 8 years, 9 months ago by Jeremy Shears.
3 June 2014 at 8:56 pm #573355
This is my latest image of the variable nebula NGC6729 in Corona Australis. I used the newly installed 0.7m (27 inch) telescope at Siding Spring, Australia which is part of the iTelescope.net network (http://www.itelescope.net/) to get my most detailed image yet.
I only started to image this nebula in early 2013 when I began using remote telescopes. But even over this short time the nebula has changed appearance significantly (see links below). All my recent images of the six known variable nebulae are held on the Orwell Astronomical Society web site. Images up to the end of 2013 are at: http://www.oasi.org.uk/Obsvns/20140101_VN/20140101_VN.shtml and all those from the start of 2014 are on the web site forum: http://forum.oasi.org.uk/viewforum.php?f=6&sid=985263be0bcc7b2ed8ba05a7a8c773a5
Attachments:4 June 2014 at 11:07 pm #576572Nick JamesParticipant
Very nice image and that is one hell of a telescope but it certainly burns through the points! I’m planning to have a go at this object during the Webb Society meeting in a few weeks time.
Nick13 June 2014 at 8:53 am #576577
My latest monthly image of MrG’s nebula is attached. The nebula continues in a stable state having had more or less the same appearance for the past 18 months. But it could change at any time so is well worth monitoring. The field of view of this image is ~ 10 x 10 arc minutes.
The full size image and all my previous attempts are on the Orwell Astronomical Society web page: http://forum.oasi.org.uk/viewforum.php?f=6
Mike.14 June 2014 at 8:18 am #576578Jeremy ShearsParticipant
it’s good to see this worthwhile project progressing.
I wonder if you have considered measuring the brightness of the nebula and the star, PV Cep. David Boyd had a paper on their variability in the 2012 June JBAA.
Keep up the imaging!
Jeremy29 June 2014 at 6:20 am #576585
My latest image of MrG’s nebula shows that the eastern arm that was so prominent in the second half of 2013 is now fading. The nebula now has an appearance similar to that in the early part of last year.
Full sized image in the usual place…http://forum.oasi.org.uk/viewtopic.php?f=6&t=43&start=10 on the Orwell AS web forum.
Why not get out and observe this interesting little nebula? It is circumpolar from the UK at RA 20h 46m +67d 58m and associated with the star PV Cephei. But be warned…it is quite small and faint.
Mike.29 June 2014 at 8:58 pm #576586
My latest image of this southern variable nebula came through on Friday. When I compared it to one taken just 23 days earlier it was clear that there had been some small changes in the nebula. I re-processed both sets of images in the same way and then compared them side-by-side. The negative images below show the changes.
The central region has brightened but the small knots of nebulosity extending eastwards have faded. A bigger version is on the Orwell AS web forum: http://forum.oasi.org.uk/viewtopic.php?f=6&t=43
This object is certainly well worth observing regularly to monitor its long term behaviour.
Mike.30 June 2014 at 6:14 pm #576589Jeremy ShearsParticipant
Great to hear the latest developments in your variable nebula project, Mike. (For some reason the image attached in your last Mr G posting didn’t come across, although the link to it you gave shows the image)
The short-term changes in NGC6729 are especially interesting.
Keep up the good work and sharing your results of this worthwhile venture.
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