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Contains:  Little Gem, NGC 6445, NGC 6440
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NGC6440 & the Box Nebula, 





    
        

            AlBroxton
NGC6440 & the Box Nebula

NGC6440 & the Box Nebula

Technical card

Imaging telescope or lens:Celestron C11 Celestron

Imaging cameras:60Da Canon40D Canon

Guiding telescope or lens:80mm EON Orion

Focal reducer:6.3 reducer Celestron

Software:Deep Sky StackerNoel's Tools5.00 Images Plus

Resolution: 800x520

Dates:June 3, 2011

Frames: 26x69"

Integration: 0.5 hours

Avg. Moon age: 1.59 days

Avg. Moon phase: 2.82%

Astrometry.net job: 678241

RA center: 267.231 degrees

DEC center: -20.360 degrees

Pixel scale: 2.938 arcsec/pixel

Orientation: 131.349 degrees

Field radius: 0.389 degrees

Description

NGC6440 although relatively near to the Sun at 20 000 light years, this globular cluster shines through about 4 magnitudes of interstellar absorption, so that it appears small and obscure in the Sagittarius star clouds.  It sits 2.3° south-west of M 23 and 4.1° north-west of M 20 (the Trifid Nebula). Discovered in 1784 by William Herschel.
Observation Notes : is a rich globular cluster, pretty bright, pretty small and much brighter in the middle. It had ragged edges with 10 stars resolved.

Comments

Author

AlBroxton
AlBroxton
License: None (All rights reserved)
4744
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NGC6440 & the Box Nebula, 





    
        

            AlBroxton