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IOTA-VTI: Video Time Inserter for Historical Occultation Timings

Explore the evolution of occultation timing accuracy from the 1600s to modern times using the IOTA-VTI system. Developed by Tony Barry of WSAAG and manufactured by VideoTimers, this innovative tool ensures precise time insertion in video recordings with an accuracy of around 0.03 seconds, eliminating the need for Personal Equation adjustments. Learn about the transition from measuring star altitudes to atomic clocks and GPS technology, revolutionizing celestial event documentation. Discover how IOTA-VTI continues the legacy of accurate occultation observations for astronomers worldwide.

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IOTA-VTI: Video Time Inserter for Historical Occultation Timings

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  1. IOTA-VTI A video time inserter for the times

  2. Occultation timings in the 1600’s • Accurate clocks not available • Times recorded by measuring the altitude of a known star at the time of an event • Accuracy – several minutes

  3. Occultation timings in the 1700’s & 1800’s • Accurate pendulum clocks and chronometers in observatories • Clocks set by transit observations • Visual recording of events • Accuracy – around 1 second

  4. Occultation timings in the early 1900’s • Accurate pendulum clocks and chronometers in observatories • Radio transmission of time • Visual recording of events • Accuracy – around 0.1 second, but affected by Personal Equation.

  5. Occultation timings in the mid 1900’s • Atomic clocks • Radio transmission of time – eg WWV • Visual, and some photoelectric, recording of events • Accuracy – around 0.1 second, but affected by Personal Equation.

  6. Occultation timings in the late 1990’s • Atomic clocks • Radio transmission of time – eg WWV • Video recording, but with audio time signal • Accuracy – around 0.1 second, but no Personal Equation.

  7. Occultation timings in the early 2000’s • Atomic clocks • Time from GPS system • Video recording • KIWI system developed to insert the time into the video • Accuracy – around 0.03 second, and no Personal Equation

  8. Occultation timings from 2008 • KIWI system withdrawn • No readily-available commercial alternative • Repairs of existing KIWI’s not always possible.

  9. Occultation timings from 26 May 2011 • IOTA-VTI system becomes available

  10. IOTA-VTI • Developed by Tony Barry of Western Sydney Amateur Astronomy Group (WSAAG), with the assistance of Dave Gault (also of WSAAG) • Manufactured in the US by Walt Morgan (VideoTimers) with the assistance of Sandy Bumgarner.

  11. IOTA-VTI To ensure continued availability at minimal cost: • Exclusive perpetual royalty-free licence to IOTA (US) • IOTA (US) has granted a 5-year exclusive sub-licence to VideoTimers for the manufacture and sale

  12. On behalf of Tony Barry, Dave Gault, Walt Morgan, and Sandy Bumgarner, we proudly ‘launch’ the IOTA-VTI : the next generation of video time inserter for occultation observations.

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