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(IAAC) Obj: NGC 1788 - Inst: TV-102 (102mm f/8.6 APO refractor)
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Observation Poster: Ron B[ee] <ronby@cox.net>
Observer: Ron B[ee]
Your skills: Intermediate (some years)
Date/time of observation: 03/03/02 8:30pm PST
Location of site: 117h 9m W (Lat 32h 43m N, Elev 2000 ft.)
Site classification: Exurban
Sky darkness: 4.9 <Limiting magnitude>
Seeing: 3, gust of winds, light pollution <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument: TV-102 (102mm f/8.6 APO refractor)
Magnification: 22x, 44x, 73x, 110x, 146x, 176x
Filter(s): none
Object(s): NGC 1788
Category: Reflection nebula.
Class:
Constellation: Ori
Data: mag 9 est size 8.0'
Position: RA : DEC :
Description:
The TV-102 located this mag 9 (est.) reflection nebula in Orion. At 22x (Pentax
40mm XL), I saw very faint nebulosity with a star seen inside it. Nebulosity
very dim at 44x (20mm TV Plossl and 73x (12mm Radian); there is a 10th
magnitude star GSC 4754:1474 embedded inside the nebula. The nebula is enclosed
by four squarish stars: SAO 131770, GSC 4754:1473, SAO 131783 and SAO 131789.
Impressively, a 2nd knot popped into view at 110x (8mm Radian - the Planetary
Plucker) and lies in the direction of SAO 131783. This 2nd knot is seen clearer
at 146x (6mm Radian). It appears that there is another star embedded in the
center of this 2nd knot as well, but it blinked in and out. Even better at 176x
(5mm Radian), both nebulosity now seem to merge. All four stars still fit
entirely into the FOV! A lot less nebulosity seen than NGC 2467. Here's a
very nice picture I found on the web.
http://www.noao.edu/outreach/aop/observers/n1788.html
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