Thread: How deep ?
View Single Post
  #17  
Old 15-01-2009, 03:00 PM
theodog's Avatar
theodog (Jeff)
Every photon is sacred !

theodog is offline
 
Join Date: Oct 2007
Location: Coonabarabran
Posts: 1,037
Quote:
Originally Posted by rogerg View Post
I don't doubt that you can reach mag 21, and reaching mag 21 is great however just a word of caution in case you are not aware: I remember trying to estimate my limiting mag in Astrometrica and when I read into it I discovered that for those "edge of detection" point sources like that the estimation is not more accurate to about +/- 2 mag. It was a while ago, and I can't remember the specifics.
Geez it may be 23!

Thanks for the word of caution Roger, well heeded.

I am, however, careful to check with other methods for any measurement. I have included a screenshot with Guide 8 to demonstrate the depth reached in the image.

I have no problems with Astrometrics, nor it seems do the MPC as I have not been q'ed regarding my estimates made with Astro..

Further, a professional Astronomer who shall remain nameless, yet has several asteriod discoveries and comets, did indicate that this program is reliable.

However, I get the point that one can't be overcautious in interpretion of data.
Attached Thumbnails
Click for full-size image (H-H74 Mag.JPG)
65.7 KB14 views
Reply With Quote