NGC 5139
(AKA Omega Centauri, Type: Globular cluster, Const: Centaurus,
Mag: 3.7, Size: 36.3')
I'm always amazed at just how BIG this
thing is.
- 04-Apr-23 - HX916 image of NGC 5139 (TV101 OTA at f/5.4
(540mm) on G11, LRGB of 20:10:10:10 minutes [10x2 minute
unbinned L+IRs, 5x2 minute unbinned RGBs], from Anza [seeing
6, transparency 8], STV guided through ST80 at
f/6). Processing: AIP (stacking (no calibration), color
combine (equal + black sky) and balance), MaxIm DL (DDP on
luminance).
- 04-Apr-15 - HX916 image of NGC 5139 (TV101 OTA at f/5.4
(540mm) on G11, LRGB of 20:6:6:6 minutes [2 minute unbinned
L+IRs, 2 minute 2x2 binned RGBs], from Anza [seeing 7,
transparency 8], STV guided through ST80 at
f/6). Processing: AIP (dark calibration, stacking, gradient
correction on L, color combine (equal + black sky) and
balance), MaxIm DL (DDP on luminance). Note: tracking errors
on luminance, what looks like coma or field curvature as
well.
- 5/13/02 - HX916 image of
NGC 5139 (f/6.3, Meade LX10, 5
minute total exposure [a stack of 10 30 second images], STV
guided, binned 2x2, dark and flat frames applied (the flat
was from 5/11/02 :( ), default Digital Development Process
(DDP) performed then simple contrast stretch performed in
AIP, from Anza (OCA site) [seeing 4, transparency 5,
tracking 4 - low in the sky]).
- 01/20/01 - STV image
of NGC 5139 (f/3.75, Meade LX10, 1 20
second exposure, wide mode, from LBV).
- 01/20/01 - STV image of NGC 5139 (f/3.75, Meade LX10, 1 60
second exposure, wide mode, from LBV).
- Digitized Sky Survey image of NGC 5139
for comparison.