August 21, 2017 Total Eclipse Plans Richard Nugent 32nd IOTA Annual Meeting July 13, 2014.

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Presentation transcript:

August 21, 2017 Total Eclipse Plans Richard Nugent 32nd IOTA Annual Meeting July 13, 2014

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

I OTA’s Method for Solar Radius Calculation Measure umbra on ground Known distances to Moon, Sun Compute diameter of Sun Known diameter of Moon

Use Baily’s Beads to determine diameter changes

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

Baader filter

Baader filters acquired and distributed by Walt Morgan

Narrow Band Filters Picard satellite SODISM* bands for diameter/shape measurements are: 535nm, 607nm, 782nm *Solar Diameter Imager and Surface Mapper

Previous best estimate for R  = ”

Narrow Band filters acquired and distributed by Richard Nugent #23a #56

PC-164CEx-2 Watec 902H2

0.5km

Ted Swift, S. limit 15 sec interval