View Single Post
  #17  
Old 26-02-2012, 12:36 AM
gary
Registered User

gary is offline
 
Join Date: Apr 2005
Location: Mt. Kuring-Gai
Posts: 5,999
Thumbs up Visual observation of the SN from Coonabarabran through the 30" Dob

Viewed the SN visually on Sat 25th Feb at approx. 02:00 AEDT from Coonabarabran,
NSW under clear skies and average seeing.

First attempted to view it through a 18" f/4.5 Dob equipped with Argo Navis
and though the galaxy was visible, there was no way that one could spot the
SN visually.

Switched to the 30" f/4.6 Dob and first using a 26mm Tele Vue eyepiece the SN
could be seen through averted vision.

Then switched to a 12mm Tele Vue eyepiece in the 30" and the SN became
self evident without averted vision.

I had printed an inverted version of the image posted by Stu which I used as a
finder chart to identify the SN. Andrew Murrell verified the observation.

Though I did not try to locate it in one of the 25" or 20" Dobs, my feeling was
that it would likely be possible in a 25" with the right magnification eyepiece
so as to frame the galaxy but probably very challenging in a 20" at the zenith
distance we observed it at.

So sorry Suzy, I think it would take a miracle to spot it visually through a 10"
and given the moist air conditions we have been enduring on the east coast
probably tough going in anything less than a 25" at an equivalent zenith distance.

Once again, congratulations to Stu and the BOSS team.

Best Regards

Gary Kopff
Reply With Quote