NGC/IC Project Restoration Effort

(This is a very very beta version)

NGC6791

 

Basic Information


Location and Magnitude


Right Ascension: 19:20:52.7
Declination: +37:46:27
Constellation: LYR
Visual Magnitude: 9.5

Historic Information


Discoverer: Winnecke
Year of discovery: 1853
Discovery aperture: 3.0

Observational


Summary description: vF (Auw 45)
Sub-type: II3r

Steve's Notes

===== NGC 6791 24" (8/12/15): gorgeous field at 200x (1/2¡) using a 13mm Ethos, but this rich cluster was superbly resolved at 200x using a 10mm Zeiss Ortho. Roughly 100 stars were visible in an irregular oval outline, slightly elongated NW to SE. The stars are remarkably uniform but slightly brighter along the southeast edge. Interestingly, a large percentage of the resolved stars form the outline as the center is richer and contains more fainter stars (like a very weakly compressed globular cluster). A string of stars extends roughly through the center, bisecting the oval and a "void" is created by this string on the southeast interior. The outline is fairly well-defined, with some brighter field stars beyond, including a couple of mag 10-10.5 stars off the south side and a mag 9.5 star 11' NW of center. Excellent cluster! 13.1" (9/11/82): fairly faint, moderately large, many faint stars are resolved over haze with averted, low surface brightness. 8": moderately large, very faint hazy patch like a low surface brightness galaxy, no resolution. NGC 6791 is one of the very oldest open clusters, along with Berkeley 17, with an age of 8 to 10 Gyr!