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Contains:  NGC 4302, NGC 4298, Pin-wheel nebula, M 99, NGC 4254
Getting plate-solving status, please wait...
M99, NGC4298, and NGC 4302, 


            Michael Feigenbaum
M99, NGC4298, and NGC 4302

M99, NGC4298, and NGC 4302

Technical card

Resolution: 10634x7138

Dates:April 27, 2019

Frames:Baader UV/IR-Cut/L Filter: 165x120" (gain: 111.00) -5C

Integration: 5.5 hours

Darks: ~50

Flats: ~50

Avg. Moon age: 22.65 days

Avg. Moon phase: 44.66%

Bortle Dark-Sky Scale: 4.00

Mean SQM: 21.03 job: 2668559

RA center: 185.048 degrees

DEC center: 14.457 degrees

Pixel scale: 0.308 arcsec/pixel

Orientation: 32.632 degrees

Field radius: 0.548 degrees

Locations: Papago Butte, near Maricopa, AZ, United States

Data source: Backyard


Here is a galaxy cluster in Coma Berenices with M99, NGC4298 and NGC4203.

The object for me with this one is to improve the stretching process to preserve color better and better star shapes.

I think I generally am overly aggressive with NR so I have changed the method a little in that area. I am also trying to trust the histogram a little more with respect to stretching in an overall sense.

Any comments or criticism always welcomed!!



Michael Feigenbaum
License: None (All rights reserved)


  • M99, NGC4298, and NGC 4302, 


            Michael Feigenbaum
  • M99, NGC4298, and NGC 4302, 


            Michael Feigenbaum
  • Final
    M99, NGC4298, and NGC 4302, 


            Michael Feigenbaum


I tried to implement some excellent advice from Fritz on NR and stretching... Hopefully this image reflects some improvement in those areas. But the real take-away from this exercise is that more integration is required if I am to achieve the results I am looking for. This is what my friend Frank has been telling me for months... Kind of like the old adage that you can't squeeze blood from a stone.

Sky plot

Sky plot


M99, NGC4298, and NGC 4302, 


            Michael Feigenbaum

In these public groups

Cloudy Nights
Fast Newtonians