Celestial hemisphere:  Northern  ·  Constellation: Coma Berenices (Com)  ·  Contains:  Coma Pinwheel  ·  M 99  ·  NGC 4254  ·  Virgo Cluster Pinwheel
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M99 Galaxy LRGB - March/April/May 2019, Geof Lewis
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M99 Galaxy LRGB - March/April/May 2019

Revision title: Heavily cropped and reprocessed using PixInsight.

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M99 Galaxy LRGB - March/April/May 2019, Geof Lewis
Powered byPixInsight

M99 Galaxy LRGB - March/April/May 2019

Revision title: Heavily cropped and reprocessed using PixInsight.

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Description

Had a real struggle capturing data for this one due to a combination of many cloudy nights, poor seeing & transparancy on the clear nights and rapidly diminishing night skies due to the approaching onset of permanent astronomical twilight between mid May and late July. Many of the RGB subs were captured through high haze which made a mess of the background, so I had to work hard when processing to disguise that, before layering the sharpened luminence.

UPDATE March 2024: When I reviewed the RGB data with the Screen Transfer Function in PI, I realised just how bad it was. All 3 RGB filters suffered from huge halos and relections from the bright star top left, nevermind the awful gradients (see below)..
WhatsApp Image 2024-03-18 at 14.40.40_28e20d7f.jpg

I there decided to heavily crop the data just for the galaxy and reprocess in Pixinsight.

Comments

Revisions

  • M99 Galaxy LRGB - March/April/May 2019, Geof Lewis
    Original
  • Final
    M99 Galaxy LRGB - March/April/May 2019, Geof Lewis
    B

B

Title: Heavily cropped and reprocessed using PixInsight.

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M99 Galaxy LRGB - March/April/May 2019, Geof Lewis