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Contains:  NGC 6633
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NGC 6633 Tweedledum Cluster, 


            Jirair Afarian
NGC 6633 Tweedledum Cluster

NGC 6633 Tweedledum Cluster

Technical card

Resolution: 5412x3630

Dates:May 16, 2018

Frames:Badaar Moon and SkyGlow Badaar: 3x300" (gain: 11.00) bin 1x1

Integration: 0.2 hours

Darks: ~10

Flats: ~20

Bias: ~50

Avg. Moon age: 1.12 days

Avg. Moon phase: 1.41%

Bortle Dark-Sky Scale: 6.00

Mean FWHM: 9.00

Temperature: 19.00 job: 2063549

RA center: 276.881 degrees

DEC center: 6.575 degrees

Pixel scale: 0.784 arcsec/pixel

Orientation: 206.825 degrees

Field radius: 0.709 degrees

Locations: Home Observatory, Newmarket, Ontario, Canada

Data source: Unknown


Poor transparency tonight and misty atmosphere so I got a short exposure of this star cluster.

NGC 6633 is an open cluster, in the constellation Ophiuchus. This cluster is nearly as large as the full moon, and contains 30 stars which make it shine at a total magnitude of 4.6; the brightest star is of mag 7.6. Its age was estimated at 660 million years.



Jirair Afarian
License: None (All rights reserved)


  • NGC 6633 Tweedledum Cluster, 


            Jirair Afarian
  • Final
    NGC 6633 Tweedledum Cluster, 


            Jirair Afarian

Sky plot

Sky plot


NGC 6633 Tweedledum Cluster, 


            Jirair Afarian