NGC 6218 (Messier 12 or M12) is a globular cluster towards the constellation of Ophiuchus.

RC 12" Astrograph (LRGB)

26' x 26' FOV

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Bigger size: 1500 px
© Velimir Popov & Emil Ivanov 2020

NGC 6218 also known as Messier 12 (M12) is a globular cluster in the constellation of Ophiuchus. The distance to NGC 6218 is 4.8 kpc or 15.7 kly ((Harris 1996 updated in 2010). It has been suggested that M12 should belong to the thick disk and not Galactic halo based on its kinematical properties (Dinescu et al. 1999; Pritzl et al. 2005).

Charts and image details obtained from



Image and FOV details

Details for the image
Center of field RA 16:47:12.5 (h:m:s)
Center of field DE -01:56:23.3 (deg:m:s)
FOV 26 x 26 (arcmin)
Pixel scale: 1.04 (arcsec/pixel)

RC 12" Astrograph (IRIDA South dome)

Imaging details

Optic(s): RC 12" with Astro-Physics corrector @ f/5 (RC)
Mount: ASA DDM85 Premium
Camera: ATIK 4000 M
Filters: Astronomik II: Lumиnance
Dates/Times: 2013-09-08
Location: IRIDA Observatory, BG, longitude: E 24 44' 18", latitude: N 41 41' 42"
Exp. Details: LRGB: L: 5 x 2 min R: 5 x 2 min G: 5 x 2 min B: 5 x 2 min
  Bin 1, Total Exposure Time -40 min
More details: Bias, dark and flat frames reduction
Processing: PixInsight / PS
Copyright: Velimir Popov and Emil Ivanov 2013-2020. All Rights Reserved
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