(IAAC) Obj: B133 - Inst: Vixen 9x63 binoculars

anonymous at sedna.atmob.org anonymous at sedna.atmob.org
Tue Aug 14 11:00:37 EDT 2007


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Observation Poster: Stéphane Meloche <stephanemeloche at videotron.ca>

Observer: Stéphane Meloche
Your skills: Advanced (many years)
Date/time of observation: 2007/07/22 5h05 UT
Location of site: St-Joseph-de-Coleraine (Qc) Canada (Lat 45.96°, Elev )
Site classification: Exurban
Sky darkness: 5.8 <Limiting magnitude>
Seeing:  <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument: Vixen 9x63 binoculars
Magnification: 
Filter(s): 
Object(s): B133
Category: Dark nebula.
Class: Opacity = 6
Constellation: Aql
Data: mag   size 10' x 3'
Position: RA 19:06.1  DEC -06:50
Description:
In Aquila, at ~ 1½° S of Lambda Aql. This dark nebula is clearly visible from
the deep sky, which is, in fact, a part of the Milky Way. I located B133 with
the following triangle: in the west, a group of 4 stars, composed by HD 176630,
HD 176699, HD 176714 and TYC 5140-1347-1, form the first end. The second end is
made up of TYC 5141-107-1, HD 178459 and TYC 5141-298-1, in the east. In the
south and forming the top of triangle, HD 177444. B133 is just NW of this star.
Extent of this dark nebula, just as its opacity and the fact that it is easily
visible from the deep sky, are surprising characteristics. Also, the size of
B133 is very noticeable at 9x, slightly smaller in surface than the first group
of 4 stars forming the western end of the triangle. It is, on the other hand,
difficult to see contours, badly definite at this magnification. B133 is part of
the Scutum star cloud.
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