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

3. 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

4. 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

5. Use Baily’s Beads to determine diameter changes

7. 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

8. Baader filter

9. Baader filters acquired and distributed by Walt Morgan

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

12. Previous best estimate for R  = 959.63”

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

14. PC-164CEx-2 Watec 902H2

15. 0.5km

16. Ted Swift, S. limit 15 sec interval