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SCOTT'S NEBULA - by John Drummond, NZ

 

Prompted by a question to the Digital Astro Yahoo group as to what a nebula was that Scott from Australia imaged, I did some research and came up with the following conclusion...

 

Scott's email:

Imaged this tonight
http://www.users.on.net/~josiah/baader/unknownsmall.jpg
Its at 12 deg 50 m21s -61 deg 34.54 No starmaps seem to have it
listed, despite it being well within the range of my gear.
For the shot: 1350 and 1800 sec shot, ISO 400 cropped full res from
larger image. 10 inch F5.6 newtonian and EOS 300D, Baader UHCS filter
from urban site. Quite amazing what lies in the deep south that isnt in
maps and catalogues.
Scott

Checking the coordinates with GUIDE 8.0 software suggested that it is :

GN12.47.3
Maximum diameter: 180 arcseconds
Emission nebula
Brightness level: 5 (1=brightest, ... 6=faintest)
Brightness level extremely approximate

Alternative designations for this object: GN 12.47.3 or RCW 71

Below are a few wide field images to place Scott's Nebula in context...

 

 
Crux and the object's field. Alpha is upper right, Beta is lower centre, Gamma is left, Delta is upper left
GN 12.47.3 (arrows). Beta Crucis is at the top, Jewell Box is at 8 O'Clock to Beta. North is up, east is left. 448mm FL @ f4, 14 x 2 minute @ 800asa - 26th July 2005 (cropped slightly)
A crop of the above image. Compare the stars to Scott's image below - which are orientated roughly in the same PA. The bright double on Scott's is the first bright 'single' at 5 o'Cock to the EN
Scotts original image - 10" f5.6 Newt. 1350 and 1800 sec shot, ISO 400 cropped. North is roughly up, east is left.
The approximate FOV of Scott's image as seen on GUIDE 8.0 software... Note the double is at 5 O'Clock to the nebula

 

Well done Scott - nice image!