(IAAC) OBJECT: NGC5139 (Omega Cent., Globular)INST: 6" f/5 reflector
Observer: Todd Gross
Your skill: Intermediate - Many years
Date and UT of observation: 12/28/99
Location & latitude: Grand Cayman, BWI, 20n
Site classification: Suburban
Limiting magnitude(visual):approx.4.5zenith, 4 nr.object
Seeing (1 to 10 - worst-best): 5
Moon up (phase?): Yes, gibbous
Instrument: 6" f/5
Filters used: none
Object data: GC
Position: 13:27 -47:29
Personal "rating" for this aperture: B+
Previously viewed Omega centauri through smaller aperture (80, 85mm
barely resolved on previous trip) and larger aperture (10" SCT, wow)
This is an important break-point aperture in these suburban sky conditions.
Using 109 and 138x, I was able to completely resolve it when it got high
enough in the sky, but it's uniform and huge starfield
was still dim. It sprawled over a good chunk of the field of view, unlike
M3 which I also viewed in the same session - which is tiny and unresolved
at the same magnifications.
Huge, round, uniform. I could know I was about to resolve it through
it's center into individuals when working on seeing the brighter
outlying members .. concentrating on the N/W side
of the cluster which had borderline 12th magnitude stars. Once able to see
those, much of the cluster broke down and swarmed the field..
Best resolved in a 5.5mm eyepiece, but more pleasurably bright and framed
in the 7mm nagler.
Only "ground sugar" resolution from 9mm on up through 22mm, but still a
object due to it's overwhelming presence and increase overall brightness as
increases the exit pupil size.
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