NGC/IC Project Restoration Effort

(This is a very very beta version)

NGC6642

 

Basic Information


Location and Magnitude


Right Ascension: 18:31:54.3
Declination: -23:28:33
Constellation: SGR
Visual Magnitude: 8.9

Historic Information


Discoverer: Herschel W.
Year of discovery: 1784
Discovery aperture: 18.7

Observational


Summary description: globular, pB, pL, iR, gpmbM, rrr, st 16
Sub-type: IV

Steve's Notes

===== NGC 6642 24" (8/23/14): at 375x, this fairly bright gc contains a very bright core and an irregular 2' halo. Stars stream out to the east and west creating an impression of elongation. The core is very lively and a few brighter stars are clearly resolved, though packed together very tightly. Roughly 20 stars are resolved in the halo. At 500x, 30-35 stars are resolved (many popping in/out of view) including 8-10 in a clump at the center and close to the core. A single brighter star is just south of the core and a nice pair (~3" separation) is in the halo on the NNE side. A string of stars extends out of the cluster to the north. Easily visible in the 80mm finder at 25x and the finder field contains M22 just 1.1¡ SE. 18" (7/14/07): at 393x appears as a fairly small but fairly bright globular with a very bright 30" core and 2' halo. The small core is very mottled and partially resolved into 2 or 3 clumps. Roughly 15-20 mag 14.5-16 stars are just visible in the halo including a very close pair on the NNE edge. Located just 1.1 degrees NW of M22. 17.5" (5/10/91): fairly bright, fairly small, round, 2' diameter, bright core seems slightly offset. Half a dozen mag 14-15 stars are resolved in the mottled halo. A mag 11 field star 2.2' NW and a mag 13.5 star 1.5' NW of center are collinear with the core. Located in a field rich in faint stars. 8" (6/19/82): fairly bright, small, bright core, fainter halo, no resolution.