(IAAC) Obj: NGC 6726, NGC 6727, NGC 6729, IC 4812, Bernes 157 - Inst: 15" f/4.5 Obsession

[anonymous at s15272250.onlinehome-server.com]

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Observation Poster: Armin Hermann <burmeseinn at yahoo.com>

Observer: Armin Hermann
Your skills: Advanced (many years)
Date/time of observation: 24 06 08
Location of site: Khao Poon Hill, 7km from Kanchanaburi, Thailand (Lat 14 N, Elev 200)
Site classification: Exurban
Sky darkness: 5.6 - 6 changing <Limiting magnitude>
Seeing: 9 <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument: 15" f/4.5 Obsession
Magnification: 131x, 342x
Filter(s): OIII
Object(s): NGC 6726, NGC 6727, NGC 6729, IC 4812, Bernes 157
Category: Reflection nebula.
Class: 
Constellation: CrA
Data: mag -  size -
Position: RA 19:02  DEC -37:35
Description:
Complex of several reflection nebulas around bright stars in Corona Australis. 
The brightest nebula is NGC 6729, located between two variable stars (R CrA 
9.5-13mag and T CrA 11.7-13.5mag). The stars appear to be of roughly 12mag 
now, with T CrA being a bit fainter. The nebula is also brighter near R CrA. 
It's shape is oval, comet-like. Size approx 1x2'. The nebula does apparently 
change brightness unregularly, keeping an eye on this object might deliver 
some surprise. NGC 6726/27 is a fairly bright reflection nebula around 7 and 
9mag double star. The nebula is visible stretching out some 1.5'  from the 
stars. Fainter is the reflection nebula IC4812 around a bright 6.7mag star. 
The round structureless glow has a diameter of roughly 2'. None of the 3 
nebulas in the complex responds to the OIII filter. They all dim, which is a 
sign that they are reflection nebulas and dust. SE of the complex is a 
completely empty area of 45x15' cald Bernes 157 dark cloud. Its is (incl. the 
refl nebulas) only 420 ly away from the solar system, that's why there are no 
foreground stars.

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