Download - August 21, 2017 Total Eclipse Plans Richard Nugent 32nd IOTA Annual Meeting July 13, 2014
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August 21, 2017 Total Eclipse Plans
Richard Nugent32nd IOTA Annual Meeting
July 13, 2014
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Primary goals for this eclipse
• Continuation for IOTA’s long term solar radius measurement research
• Standardization of video equipment
• Standardization of solar filters
• 2nd use of narrow band filters
• Results: calibrate with Picard satellite data
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IOTA’s Method for Solar Radius Calculation
Measure umbra on ground
Known distances to Moon, Sun Compute diameter of Sun
Known diameter of Moon
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Use Baily’s Beads to determine diameter changes
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Use Baily’s Beads to determine diameter changes
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Equipment Specifications
• Telescope aperture: 75mm – 100mm
• Field of View – 15' - 20'
• Solar filter – Baader brand – in sheets
• Narrow band filters – Wratten #23, #56
• Video camera: PC164C(EX-2), Watec 902H
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Baader filter
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Baader filters acquired and distributed by Walt Morgan
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Narrow Band Filters
Picard satellite SODISM* bands for diameter/shape measurements are: 535nm, 607nm, 782nm
*Solar Diameter Imager and Surface Mapper
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Previous best estimate for R = 959.63”
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Narrow Band filters acquired and distributed by Richard Nugent
#23a #56
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PC-164CEx-2
Watec 902H2
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0.5k
m
0.5k
m
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Ted Swift, S. limit
15 sec interval
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