NGC/IC Project Restoration Effort

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NGC6405

 

Basic Information


Location and Magnitude


Right Ascension: 17:40:20.0
Declination: -32:15:30
Constellation: SCO
Visual Magnitude: 4.2

Historic Information


Discoverer: Hodierna
Year of discovery: 1654
Discovery aperture:

Observational


Summary description: Cl, L, iR, lC, st 7, 10…
Sub-type: III2p

Steve's Notes

===== NGC 6405 18" (7/21/04): at 92x roughly 200 stars are visible in this beautiful naked-eye cluster. There are four bright mag 6-7 stars in the main group which form a perfect parallelogram with longer sides of 7' oriented WSW-ENE and shorter sides of 4' oriented NW-SE. A string of stars connects the two stars on the long southern side of the parallelogram (the star at the SE vertex is orange tinged BM Sco) with a nice double star embedded in the string. The NW vertex is part of a bright isosceles triangle with two mag 8-9 stars and ~7' further NW of this star is a small, nice asterism consisting of a trio and a double. Also a wedge-shaped group of 7 stars extends between this NW vertex (which also has two additional fainter companions) and the SW vertex (short side of parallelogram) Another distinctive string of stars runs through the center of the parallelogram roughly parallel to the two long sides. A nice mag 9/10 double resides along the long northern side of the parallelogram. An additional mag 7 star is the SW of the parallelogram. Around the main group there are numerous scattered stars and the cluster does not have a distinct border. Over 70 stars in the cluster are brighter than 11th magnitude. 13.1" (7/5/83): very bright, fairly large. Includes a curving rows of stars and a close group of 7 stars near the center. The brightest star BM Scorpii is on the east side. Smaller than M7 but richer. Fairly easy naked-eye cluster.