NGC/IC Project Restoration Effort

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NGC6416

 

Basic Information


Location and Magnitude


Right Ascension: 17:44:19.9
Declination: -32:21:40
Constellation: SCO
Visual Magnitude: 5.7

Historic Information


Discoverer: Herschel J.
Year of discovery: 1834
Discovery aperture: 18.3

Observational


Summary description: Cl, vL, Ri, lC
Sub-type: IV1p

Corwin's Notes

===== NGC 6416. This cluster is scattered and rather ill-defined. The brighter stars to the northeast were taken by Andris Lauberts to place the center of the cluster, and indeed JH's mean position seems to agree with that. However, JH's descriptions on two nights make the cluster at least as large as his 15-arcminute field, and -- on the second night -- considerably larger ("More than fills field"). This suggests that JH also included the stars to the southwest in his object. The position I've adopted for the cluster reflects that supposition. Whether it's right or not can be answered by a detailed photometric, spectroscopic, and astrometric study. Also see NGC 6421 where this may play a role in the identification of that star cloud.

Steve's Notes

===== NGC 6416 17.5" (8/2/97): best view at 100x as it fills the 220x (9mm Nagler) field. The most detached portion consists of a large cloud of at least 15' diameter and containing roughly 75 stars. There are four brighter stars (including mag 8.6 SAO 209208) but most of the stars are pretty uniform in brightness and fairly evenly distributed at 100x. The cluster may extend further north than the region described above but the star density quickly decreases to the general Milky Way appearance. 8" (6/19/82): almost two dozen faint stars, large, scattered, not impressive as fairly coarse.