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Choose a PROFESSIONAL TELESCOPE here on earth, or in space around the Earth, with which to observe Charles Messier's Butterfly Cluster - Essay Example

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Summary
It is relative to the constellation of Scorpius. Its shape resembles like a butterfly. Charles Messier catalogued the cluster as M6 in 1764. Kenneth Glyn Jones writes, “….his catalogue was the first accurate and systematic…
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Choose a PROFESSIONAL TELESCOPE here on earth, or in space around the Earth, with which to observe Charles Messiers Butterfly Cluster
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Physics (including Earth and space sciences), Essay Topic: Choose a PROFESSIONAL TELESCOPE here on earth, or in space around the Earth, with which to observe Charles Messiers "Butterfly Cluster"
The Butterfly Cluster is an open cluster of stars. It is relative to the constellation of Scorpius. Its shape resembles like a butterfly. Charles Messier catalogued the cluster as M6 in 1764. Kenneth Glyn Jones writes, “….his catalogue was the first accurate and systematic list of nebulae with any size and scope.”(6) The capacity of the telescope is based on the aperture size. From this perspective, Keck and Keck II are the largest Telescopes in use with an aperture of 10 meters diameter. This telescope is composed of 36 mirror segments and it is located at Mauna Kea, Hawaii, 4200 meters above sea level.
Characteristics
“Most of the bright stars in this cluster are hot, blue B type stars but the brightest member is a K type orange giant star, BM Scorpii, which contrasts sharply with its blue neighbors in photographs. BM Scorpii is classed as a semi regular variable star, its brightness varying from magnitude +5.5 to magnitude +7.0.Estimates of the Butterfly Clusters distance have varied over the years, with a mean value of around 1,600 light years, giving it a spatial dimension of some 12 light years. Modern measurements show its total visual brightness to be magnitude 4.2” (www.answers.com....)
“Butterfly Cluster (M6, NGC 6405)
The details are as under:
Visual magnitude: 5.3
Angular size: 25′
Diameter: 20 light-years
Age: About 50 million years
Distance: 2,000 light-years
Position: R.A. 17h 40.1m, Dec. −32° 13′” (Answers.com….)
Butterfly Cluster is “an open cluster in Scorpius 4° northwest of M7 which contains about 80 stars roughly in the shape of a butterfly. Visible to the naked eye, it was first noted by Giovanni Hodierna before 1654. Its most conspicuous star is an orange giant K star of magnitude 6.2.” (daviddarling info….)
California Association for Research in Astronomy, own and operate the Keck Telescopes. It is an association of the California Institute of Technology and the University of California. I conducted my observations from the Keck Telescope in this institute. My choice was for this telescope.
Keck Telescope specifications are:
“Optical design: Ritchey-Chretien
Mount: Altazimuth
Overall height: 24.6 meters
Total moving weight: 270 tons
Total weight of glass: 14.4 tons
Primary mirror:
Design: Actively controlled, segmented hexagon
Equivalent diameter: 10 meters
Figure: Concave hyperboloid
Number of segments: 36
Segment diameter: 1.8 meters
Segment thickness: 75 mm
Segment weight: 400 kg
Gap between segments: 3 mm
Segment material: Zerodur low-expansion glass-ceramic
Light collecting area: 76 square meters
Focal ratio: f/1.75
Secondary mirror:
Figure: Convex hyperboloid
Shape: Circular
Dome:
Height, Width: 30.8 x 37 meters
Moving weight: 635 tons
Total air-replacement 5 minutes
Instrumentation:
Visible band: 0.3 - 1.0 micron
Infrared band 1.0 - 27.0 micron
Adaptive Optics: 1-5 micron IR” (Keck….)
This Telescope project is managed by Gerald M. Smith. Its operations are computer controlled.

Works Cited
Jones, Kenneth Glyn. Messiers Nebulae and Star Clusters (Practical Astronomy Handbooks)
Cambridge University Press; 1991
Keck Telescope Facts
Web:spacecraftkits.com/KFacts.html
Web:http://www.answers.com/topic/butterfly-cluster#ixzz2IrTVqoaK.Accessed on January 24,
2013
Web:http://www.daviddarling.info/encyclopedia/B/Butterfly_Cluster.html.Accessed on January,
24, 2013 Read More
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