NGC4725

Constellation: Coma Berenices        Distance: 40 million lightyears

ngc4725

Click for full resolution (2814 x 2055)

Image spcefications:
  • Exposure: 7 hours, LRGB = 240:60:60:60 minutes
  • Camera: SBIG ST-8300M, Temp -25 ° C, Baader LRGB filters
  • Instrument: TEC 140 with field flattener focal distance 980 mm
  • Mount: Losmandy G11
  • Guiding: SBIG Off Axisguider, Starlight Xpress Lodestar autoguider and PHD
  • Location and date: Etoile St.Cyrice, France, 30 April 2014 and 21 April 2015

Image acquisition with ImagesPlus 5.75 Camera Control:
  • 16 Luminance of 15 min, binned 1x1
  • 6 Red + 6 Green + 6 Blue of 10 min, binned 1x1
  • 20 Flat fields with flatfield panel
  • 20 Dark frames of 15 and 10 min
  • 50 Bias frames

Processing in PixInsight 1.8
  • ImageCalibration, ImageIntegration, StarAlignment, ChannelCombination, BackgroundNeutralization, DBE, ColorCalibration, DynamicCrop
  • StarMask, RangeMask, Convolution, Pixelmath, ATrousWaveletTransform
  • Non lineair: HistogramTransformation, CurvesTransformation, SCNR, MorphologicalTransformation, ACDNR, LocalHistogramTransformation

ngc4725


In combination with 3 hours with 10 inch Meade in 2013: