NGC/IC Project Restoration Effort
(This is a very very beta version)
NGC6840
Basic Information
Location and Magnitude
Right Ascension: 19:55:17.0
Declination: +12:7:18
Constellation: AQL
Visual Magnitude:
Historic Information
Discoverer: Herschel W.
Year of discovery: 1784
Discovery aperture: 18.7
Observational
Summary description: Cl, P, lC
Sub-type: *Grp
Corwin's Notes
=====
NGC 6840 and NGC 6843 are two sparce clusters seen by JH; his father found
N6840. That cluster has two groups of seven stars (separated by about 5
arcminutes) in its core, surrounded by about 5-6 others. The stars are of
fairly equal brightness, all being around 11th to 12th magnitude, and cover an
area of 10 arcmin by 8 arcmin. N6843 is poorer with only around a dozen
stars, again 11th to 12th magnitude, scattered over a smaller area.
Both are superposed on rich Milky Way backgrounds, so I'm not surprised that
they did not stand out enough to be identified for RNGC. In fact, neither may
be a real cluster, but proper motions, spectroscopy, and photometry could tell
us that.
Steve's Notes
=====
NGC 6840
17.5" (7/27/95): fairly poor group of 20-25 mag 11-15 stars in a 6'x4' rectangular group. Includes about 10 brighter mag 11 stars. There are no rich groupings but a very distinctive 3' string or stars oriented NW-SE marks the NE side of the group. Stands out reasonably well at 80x but not distinguishable at 220x. Located 11' N of mag 8.1 SAO 105419. In field with NGC 6843 about 12' ENE. Listed as nonexistent in RNGC.