|
Object |
NGC 5139-
Omega Centauri |
|
Info |
Omega
Centauri is the largest and brightest
globular cluster in the sky. So prominent that it was labeled as a star on
early charts. It appears at mag. 3.7 to the naked eye. It is noticeably
elliptical in shape and is as large as the full moon. Its brilliance and
large apparent size is due partly to its relative closeness being 17,000
l.y. making it one of the closest globular clusters to us. |
|
Date |
4 / 2/ 07 |
|
Location |
BayTop
Observatory- Streaky Bay South Australia |
|
Instrument |
Home built 10" Newtonian (Bob
Royce primary) with
MPCC coma corrector.
System working @ native
f4/ 1016 FL 1.35
arcsec/pixel- FOV 23.3x29.4 |
|
Mount |
Celestron CI700 controlled by a Mel
Bartels Goto Control System
with Vexta PK264m-01b motors with a pulley and belt system |
|
Camera (CCD) |
Starlight
Xpress HX916 monochrome with
Atik manual filter wheel. |
|
Exposures |
L:
20' R:10' G:10' B:10' (40sec sub exposures all
unbinned) No dark frames removed |
|
Guiding |
none |
|
Filters |
Astronomik
clear/ RGB Type II Filter
set |
|
Notes/ Conditions |
Conditions
were a little unsteady due to the hot weather of the day and took some
time until optics settled. Around1:30am. Moon at 98.2% luminance phase.
Gradients removed. Average FWHM 2.3 over the imaging period. |
