M12 (NGC 6218)

Telescope: ESO 2.2 meter Cassegrain, 12977mm FL
Camera: Wide Field Imager, 4x2 mosaic of 2k x 4k CCDs, 2048 x 4096 pixels
Exposure: B, V, I: 20 seconds each Processed with PixInsight.
Image Center (J2000): RA 16h 47m, Dec -1° 57'

Created using archived data from the European Southern Observatory. Resolution 0.238 arcsec/pixel. Used image #5 from the 8 image chip set.

ESO archive FITS files:

  • I = WFI.1999-05-14T06:19:57.132

  • V = WFI.1999-05-14T06:28:10.891

  • B = WFI.1999-05-14T05:53:13.186

ESO archive query parameters:

  • Target Name: M12

  • Imaging: WFI

  • Category: Science

  • Mode: Image

  • Exptime: < 20


M12 (NGC 6218)

PixInsight Processing:

  • CosmeticCorrection (Remove dead columns and hot pixels)

  • StarAlignment

  • DynamicCrop

  • DynamicBackgroundExtraction (on each frame)

  • LinearFit (on I and B)

  • ChannelCombination (Color space RGB)

  • BackgroundNeutralization

  • ColorSaturation

  • HistogramTransformation (Initial stretch)

  • HDRMultiscaleTransform (with mask)

  • ACDNR (Reduce noise, with mask)

  • MultiscaleMedianTransform (Sharpen, with mask)

  • SCNR (Reduce green)

  • HistogramTransformation (Final stretch)

  • CurveTransformation (Redcue red background noise)