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Contains:  kappa Cru cluster, Jewel Box, NGC 4755, The star κCru
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Jewel Box NGC 4755, 





    
        

            Barry Brook
Jewel Box NGC 4755

Jewel Box NGC 4755

Technical card

Resolution: 2405x1723

Dates:Feb. 6, 2015

Frames:ZWO optical ZWO RGBL Filters: 160x10" (gain: 95.00) bin 1x1

Integration: 0.4 hours

Darks: ~100

Flats: ~100

Bias: ~200

Avg. Moon age: 17.02 days

Avg. Moon phase: 94.35%

Bortle Dark-Sky Scale: 2.00

Temperature: 6.00

Astrometry.net job: 563443

RA center: 193.425 degrees

DEC center: -60.341 degrees

Pixel scale: 1.026 arcsec/pixel

Orientation: 13.797 degrees

Field radius: 0.421 degrees

Locations: Huon Ridge Observatory, Judbury, Tasmania, Australia

Description

The Jewel Box is a small open cluster in Crux, near the bright star Beta Crucis and the Coalsack Nebula. Situated 6,400 light years from the Sun, it is only about 16 million years old.

This was a test image, to assess the DSO capability of my ZWO ASI120MM guide camera. It is uncooled, and really meant for planetary imaging and as a sensitive autoguider (the main purpose I put it to!), but I thought it might be fun to try it out. I had the gain turned up high so that I could take short images, as these were unguided. Overall it was moderately successful, though there is star bloat.

40 x 10 sec for L, R, G and B

The 2nd image (B) is processed just using the RGB data (i.e. no luminance channel).

Comments

Author

Amaranthus
Barry Brook
License: Attribution Creative Commons
2720
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Revisions

  • Final
    Jewel Box NGC 4755, 





    
        

            Barry Brook
    Original
  • Jewel Box NGC 4755, 





    
        

            Barry Brook
    B

Sky plot

Sky plot

Histogram

Jewel Box NGC 4755, 





    
        

            Barry Brook