NGC/IC Project Restoration Effort

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NGC5359

 

Basic Information


Location and Magnitude


Right Ascension: 13:59:48.0
Declination: -70:24:0
Constellation: CIR
Visual Magnitude:

Historic Information


Discoverer: Herschel J.
Year of discovery: 1835
Discovery aperture: 18.3

Observational


Summary description: Cl, vL, lRi, lC, st 11
Sub-type: OCL

Corwin's Notes

===== NGC 5359. Found by JH, this may be nothing more than a random scattering of Milky Way stars. However, it does look like a large scattered cluster, just as JH has it. He picked it up twice. The first time (17 May 1835), he noted it as a "Cl VIII class; vL, loose, straggling, stars L and S; fills field. The star taken is a double one." The second time was just a month later on 18 June 1835; this time he called it a "Cl VIII class; irreg fig, 8' diam; consists of about a dozen stars 11 m, and a great many 12, 13, 14 m." I see two groups of stars here, one somewhat richer and larger to the southwest (taken by Andris Lauberts in ESO-B as the cluster), and a second smaller and poorer to the northeast. JH's first observation seems to encompass both groups, though his position is for a double star on the western edge. His second observation is more appropriate for the southwestern group. So what should we take as the NGC object? The position that JH lists in the GC, and that Dreyer carried on unchanged into the NGC, is a mean value of JH's two observations. It doesn't help us much as it doesn't represent very well what's on the sky. I have a slight preference for the southwestern group: this is the most noticeable and JH's two positions fall within it, so it is the one that I'm going to take. However, I've listed positions and approximate diameters for all these groups of stars, and I won't be annoyed if your choice is different from mine.

Steve's Notes

===== NGC 5359 18" (7/11/05 - Magellan Observatory, Australia): at 76x I immediately noticed a 15' irregular chain of two dozen stars, roughly forming the outline of an animal - approximating a dog or horse. Within the position of the "head" of this figure is a pair of equal mag 10.5 stars at 11" separation. In fact, many of the brighter stars are 10th-11th magnitude. This chain is well detached in the field so it stands out well, although there are no dense spots and this loose group appears to be an asterism. Upping the magnification to 228x, at least 80 stars are visible within a 15' region. Listed as nonexistent in the RNGC.