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(IAAC) Obj: NGC 6520, B86 & Djorgovski 2 - Inst: 14.5" f4.5 TeleKit



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Observation Poster: Len Philpot <len@philpot.org>
Observer: Len Philpot
Your skills: Intermediate (some years)
Date/time of observation: 08/14/2004  02:45 UT
Location of site: Catahoula Lake, LA (Lat 31:28:49, Elev ~60')
Site classification: Rural
Sky darkness: ~6.0 <Limiting magnitude>
Seeing: II <I-V Seeing Scale (I best)>
Moon presence: None - moon not in sky
Instrument: 14.5" f4.5 TeleKit
Magnification: TeleVue Nagler 9mm, 185x
Filter(s): None
Object(s): NGC 6520, B86 & Djorgovski 2
Category: Open cluster. Globular cluster. Dark nebula.
Class: 
Constellation: Sgr
Data: mag 7.6  size 6.0'
Position: RA 18:03:21.1  DEC -27:52:52
Description:
NGC 6520 --
Central condensation of the cluster shows approximately 22 brighter stars;
dark nebulosity from B86 appears to overlap into the cluster area itself.
B86 --
Situated between NGC 6520 and a bright (7th mag) star to the north of M86 
itself. The edge away from NGC 6520 (west) appears to be slighlty flat at at 
least straight.
Djorgovski 2 --
This eyepiece seems to be a very good match for this scope. With an exit pupil 
of 2mm and a reasonably good (but not unmanageable magnification), it really 
performs well on deepsky objects.
Now that I know where to look for this cluster, it's not difficult. In fact, 
it's probably more obviou now than when I first saw it at the TSP. However, 
that's probably due to familiarity with it, since the skies here (although not 
bad) are certainly not Prude Ranch skies...
A slight little almost circular haze in the lower center of the trapezium 
formed by one 8th and three roughly 10th magnitude stars. The haze appears to 
be slightly oblong and brighter on one edge.
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