NGC6712
- Globular
Cluster in Scutum
NGC6712
Mag 8.1, 9.8 arcminutes across
PLN 25-4.2
Mag 15, 1.4 arcminutes across
Note at right end near bottom, Planetary Nebula PLN 25-4.1 !!!
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This from SEDS.ORG re NGC6712:
Probably discovered by Le
Gentil on July 9, 1749.
Discovered by William Herschel
on June 16, 1784.
This
globular was first cataloged by William Herschel as H I.47, as he first
classified it as a bright round nebula. John Herschel numbered it h
3762 in his "Cape" catalog on the ground of his observations in the
1830s, and included it in his General Catalogue of 1864 as GC 4441.
At its distance of 22,500 light-years, NGC 6712's apparent
diameter of 7.4 minutes of arc corresponds to a linear extension of
about 50 light-years, and its visual brightness of 8.1 mag to an
absolute magnitude of -7.50, or an intrinsic luminosity of about 90,000
times that of our Sun. Its overall spectral type has been determined as
F9. It is approaching us at 107.5 km/s.
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Camera: StarlightXpress Trius SX814 w Astrodon Gen II RGB
Scope: Astro-Physics AP155EDF w 0.75x TCC reducer/flattener
Mount: Paramount MX guided with an SBIG ST-402ME and Borg 60mm
piggybacked
RGB 12/12/12 x 5 min
Acquired with TSX and CCD-Commander
All images reduced aligned and combined in PixInsight
Colour combines and bulk of processing in PixInsight. Cropping and
save-to-web in PS
CC 2018
Lucknow, Ontario
Aug 1/2 2018
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