Arp 90

[Photo]

North is up (mirrored, exact). 0.53"/px [15' x 9.2' field]. FWHM = 3.9"

Arp 90 is the two interacting galaxies in the east.

The west of the image has a wierd distorted galaxy (?), with a similar redshift to the interacting pair. This means it could be a tidal fragment, or a gravitationally bound irregular galaxy... I really don't know.

Total exposure time:
314 * 30 seconds = 2.6 hours.
Used in stack:
276 * 30 seconds = 2.3 hours.
Telescope:
C9.25 (230mm, f/10, fl=2300mm) + 0.63 Starizona reducer
Camera:
IMX533 (16mm diagonal, square, color)
Processing:
  1. Callibration (dark + flat)
  2. Stacking (average w/ outlier rejection)
  3. White balance and background subtraction (no gradient removal)
  4. Asinh stretch (color preserving)
  5. Rotation + crop
  6. Tone curve

Taken during one night, with typical (ML-free) processing... except I rotated the image before cropping to align it to north. This should make it easier to cross reference.

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