Leo Triplet (M65, M66, and NGC 3628

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The Leo Triplet (M65, M66 and NGC 3628) is a group of galaxies roughly 35 million light years away. The galaxy NGC 3628 is sometimes referred to as the Hamburger Galaxy.

This particular image is a mosaic of 2 panels (Left to Right) taken with RGB filters.

Imaging Details

  • Workflow: LRGB + Mosaic
  • Red Filter: 36*300 seconds
  • Green Filter: 36*300 seconds
  • Blue Filter: 36*300 seconds
  • Binning: 1×1
  • Total Imaging Time: 18 hours
  • Imaging Dates (5 nights):
    • 3/11/2021
    • 3/13/2021
    • 3/18/2021
    • 3/19/2021
    • 4/01/2021

Leo Triplet Annotated

This Post Has 2 Comments

  1. Eric Leake

    Hi Daniel, thanks so much for the workflows. I am about to dip my toes into the post-pre-processing parts.
    One question: Do I need dark flats to remove dust bunnies? my rig is mobile and doing flats are a pain. I always dither and that seems to take care of dust. I made a flat master with sharpcap pro this morning, added it to the workflow and I suddenly clearly saw the dust bunnies.

    1. virtualfeller

      Dark flats, no. Flats, maybe. Having a mobile rig makes things difficult from that perspective. I wouldn’t want to sit out somewhere after a long night of imaging to take a bunch of flats. You are right, dithering will help. If your camera position doesn’t change while you move, you can take the flats when you get home.

      Unfortunately, the hard part of processing these photos is everyone’s setup is different. What I would do is one time while you image, take flats. Then process the image with flats and process again without flats. See which one is better. Or see if there is a major difference.

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