Identify this object?????

[allan gould]

Can someone assist me in identifying this small red nebula that Ive noticed in several of my images of Corona Australis taken several years apart. So far I have been unsucessful.
The object is circled in the image below

[MrB]

I think it may be associated with NGC 6729?
http://spaceinfo.com.au/2011/03/19/toddler-stars-tear-up-the-nursery/

Dunno, when I do an object search for Corona Australis at DOCdb (http://www.docdb.net/constellation.php) I can not find any object with the same co-ord that CDC gives me for that location.

[h0ughy]

http://upload.wikimedia.org/wikipedia/commons/7/78/R_Coronae_Australis_region.jpg this has a better view of it - maybe we can idetify it somehow - and for memory i think Scott Alder chased this one up

[mithrandir]

I solved your image with astrometry.net (http://live.astrometry.net/status.php?job=alpha-201204-97229822) and then used the generated FITS in CdC to look up the coords of the centre of your circle 19h01'34.6" -37d02'58.2" on Vizier

That is almost dead on PGC 629115 (http://vizier.u-strasbg.fr/viz-bin/VizieR-5?-ref=VIZ4f8ac51c43fe&-out.add=.&-source=VII/242/catalog&recno=588672)

[ballaratdragons]

Solved :thumbsup:

Allan, it took a lot of detective work, and double-checking the answers already given in here, but I have found out what your object is.

Although at first glance it appears to be a seperate object, it is actually only a part of Variable Nebula NGC6729, also known as Caldwell 68.
Sorry Andrew, but it isn't your galaxy PGC 629115. That galaxy may be the Face on Spiral at the bottom of my attached image.

Here is an expanding image of the area.

The final image in more detail (at almost the same scale as the 2nd image) shows how it is all connected and part of the one nebula.

and here is the Reference to it: http://en.wikipedia.org/wiki/File:NGC_6729.jpg

[allan gould]

Simon, David, Andrew and Ken,
Many thanks for the efforts you have put in as it's really appreciated. I could not find anything descriptive but did find images close to the object but no actual designation. It was present in two images taken 2 years apart so I knew it wasn't an artifact.
Again, many thanks guys.

[rogerg]

Interesting read and I'm glad you had it identified ... most of the time with such things I end up giving up or finding it's an optical artifact :)

[allan gould]

Thanks Roger but you can generally depend on IIS members to track something like this down if you can't do it yourself. You just have to know where to look ( or ask).

[mithrandir]

You're right Ken, I must have put the wrong values into Vizier. This is what Unimap gets from the image using USNO-B1 and HyperLEDA. The star at the centre of the circle is 3UC 106-396986 (in the UCAC3 catalog) at RA: 19h02m24.997s DE:-37d01'42.16"