NGC/IC Project Restoration Effort

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NGC6475

 

Basic Information


Location and Magnitude


Right Ascension: 17:53:50.0
Declination: -34:47:36
Constellation: SCO
Visual Magnitude: 3.3

Historic Information


Discoverer: Ptolemäus
Year of discovery: -130
Discovery aperture:

Observational


Summary description: Cl, vB, pRi, lC, st 7…12
Sub-type: II2r

Steve's Notes

===== NGC 6475 18" (7/21/04): at 92x at least 300 stars are visible in the cluster, though very difficult to count due to the very large size (overfills the 42' field). The more concentrated part of the cluster spans perhaps 30' and includes a dozen stars of mag 7.5 or brighter in the main body. This cluster is much larger and brighter (very prominent naked-eye), but it is much more scattered than M6 and so is less impressive. There are several bright, distinctive strings in the cluster including a N-S string of ~8 stars on the east side of the central region. An equilateral triangle of mag 6, 7 and 8 stars with sides of 3' is on the NW side of the core of the cluster. A clump of 5 stars is near the center including two mag 6 and 7 stars. On the south side of the center of the cluster is an 11' string of 5 mag 5.6 to 7.8 stars oriented SW-NE with the bright mag 5.6 star (HD 16258) on the SW end a distinctive yellow color. 13.1": very bright, very large, impressive but scattered, overfills 52' field. Open cluster H18 lies 45' SE and globular cluster NGC 6453 40' WNW of center. Prominent naked-eye cluster in dark sky. Includes several blue-white and yellowish stars. 8": overfills 40' field, not many faint stars, scattered.