NGC/IC Project Restoration Effort
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NGC6546
Basic Information
Location and Magnitude
Right Ascension: 18:7:22.0
Declination: -23:17:48
Constellation: SGR
Visual Magnitude: 8.0
Historic Information
Discoverer: Herschel J.
Year of discovery: 1837
Discovery aperture: 18.3
Observational
Summary description: Cl, vL, vRi
Sub-type: III2m
Corwin's Notes
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NGC 6546. JH says of this, "The middle of a great and rich cluster in the
milky way" (he never capitalized "milky way"). He listed the NPD only to a
full minute of arc; his habit is to specify a precision of an arcsecond, so
this is clearly intended to indicate more uncertainty than usual.
In the DSS images, the object does indeed appear to be a cluster superposed on
a Milky Way star cloud. As usual, the star cloud appears defined by the
absorption patches surrounding it, and I have a suspicion that the edges of
the cluster are similarly defined. Also as usual, astrometric, photometric,
and spectroscopic studies may provide an answer to the question, "Is this a
real cluster?"
Steve's Notes
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NGC 6546
17.5" (8/27/92): bright, large, scattered, 10' diameter. Including three mag 9 stars on the east side, 10 mag 11-12 stars mag and roughly 70 stars total. Between the three mag 9 stars is a very faint, rich group of 15-20 stars. Near the west edge is a faint, very close double. The majority of the cluster stars are fairly evenly distributed with no other dense regions. Situated in a rich Milky Way field.
8" (8/23/84): scattered group of about 40 stars with 20 stars easily visible and three brighter mag 9 stars on the east side, elongated ~E-W. A mag 8 star is in the field to the NE.