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Contains:  The star 21Com, The star 18Com, The star 17Com, The star 16Com, The star 14Com, The star 13Com, The star 12Com, The star 7Com
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Melotte 111, 


            Tim Stone
Melotte 111

Melotte 111

Technical card

Imaging telescope or lens:Takahashi CCA-250

Imaging camera:Apogee Aspen 16M

Mount:Paramount ME

Guiding telescope or lens:Stellarvue SV80ED

Guiding camera:SBIG STi

Focal reducer:Takahashi .73X Reducer QE

Software:Maxim DLPhotoshop CC

Filters:Astrodon E-series RAstrodon E-series GAstrodon E-series BAstrodon E-series 2 L

Resolution: 7220x7220

Dates:May 17, 2014May 23, 2014May 25, 2014May 27, 2014

Astrodon E-series 2 L: 48x120" -30C bin 1x1
Astrodon E-series B: 29x120" -30C bin 1x1
Astrodon E-series G: 30x120" -30C bin 1x1
Astrodon E-series R: 30x120" -30C bin 1x1

Integration: 4.6 hours

Avg. Moon age: 24.13 days

Avg. Moon phase: 33.09% job: 288856

RA center: 12h 24' 22"

DEC center: +25° 40' 19"

Pixel scale: 2.057 arcsec/pixel

Orientation: 0.393 degrees

Field radius: 2.917

Locations: Prairie Sky Observatory, Funk's Grove, IL, United States


Melotte 111 is a relatively small but nearby open cluster, consisting of about 40 stars, easily seen with the naked eye in the constellation Coma Berenices. In terms of angular size, it is the largest open cluster in our skies. At 280 light years distance, it is roughly twice as far as the Hyades, the next largest angular size open cluster in our skies. It is superposed upon a rich background of distant stars and far more distant galaxies.

This image is composed of four LRGB panels taken with the Takahashi CCA250. Several nights were required to capture the data because the weather was stubbornly uncooperative!



Tim Stone
License: None (All rights reserved)

Sky plot

Sky plot


Melotte 111, 


            Tim Stone