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Total Solar Eclipse Observations and Equipment at the 32nd IOTA Annual Meeting

This document outlines the primary goals and methods for observing the August 21, 2017, total solar eclipse as discussed at the 32nd IOTA Annual Meeting on July 13, 2014. Key objectives include long-term solar radius measurement, standardization of video equipment and solar filters, and employing narrow band filters for precise measurements. The methodology leverages Baily's Beads for diameter changes, calibrating with Picard satellite data. Equipment specifications are provided, including telescope aperture, solar filters, and video camera types, aimed at accurately calculating the solar diameter and enhancing observational standards.

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Total Solar Eclipse Observations and Equipment at the 32nd IOTA Annual Meeting

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

  2. 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

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

  4. Use Baily’s Beads to determine diameter changes

  5. Use Baily’s Beads to determine diameter changes

  6. 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

  7. Baader filter

  8. Baader filters acquired and distributed by Walt Morgan

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

  10. Previous best estimate for R = 959.63”

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

  12. PC-164CEx-2 Watec 902H2

  13. 0.5km 0.5km

  14. Ted Swift, S. limit 15 sec interval

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