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7 Months of Asteroidal Occultations in North America

This report provides an overview of the asteroidal occultation observations in North America from September 2017 to March 2018, including positive and missed observations, as well as the best observed events during this period.

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7 Months of Asteroidal Occultations in North America

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  1. 7 Months of Asteroidal Occultationsin North America September 2017 through March 31, 2018 Brad Timerson

  2. Asteroidal Occultation Observations Extrapolated values for 2018: Positives, 176; Misses, 420; Total Observations, 596

  3. Asteroidal Occultations by Number of Chords Extrapolated Values for 2018: 1 chord, 88; 2 chords, 44; 3 chords, 8; 4 chords, 24; >4 chords, 16

  4. Best Observed EventsSeptember 2017 through March 31, 2018 • 10 September 2017 357 Ninina – 8 chords • 9 October 2017 44 Nysa – 4 chords, model • 23 October 2017 154 Bertha – USA/Europe, 7 chords, 2 models • 3 November 2017 509 Iolanda – 2 chords, model • 6 December 2017 464 Magaira – 3 chords • 10 December 2017 151 Abundantia – USA/Europe, 7 chords, poor fit • 21 December 2017 980 Anacostia – 3 chords • 26 December 2017 65 Cybele – 3 chords, model • 28 January 2018 259 Aletheia – 4 chords • 4 February 2018 192 Nausikaa – 5 chords, model • 7 February 2018 50 Virginia – 11 chords • 9 February 2018 191 Kolga – 8 chords, new double • 9 February 2018 175 Andromache – 4 chords • 10 February 2018 303 Josephina – 8 chords • 21 February 2018 372 Palma – 4 chords, model • 4 March 2018 505 Cava – 4 chords, model • 5 March 2018 79 Eurynome – 2 chords, model • 7 March 2018 32 Pomona – 2 chords, model • 9 March 2018 2207 Antenor – 2 chords • 12 March 2018 117 Lomia – 2 chords, model • 18 March 2018 444 Gyptis – 4 chords

  5. 10 September 2017 – 357 Ninina Graze -> Chord 3 duration well known, but absolute time in question.

  6. 9 October 2017 – 44 Nysa Notice rotation of +8° for best fit.

  7. 23 October 2017 – 154 Bertha USA only model fit to chords

  8. 23 October 2017 – 154 Bertha Europe only model fit to chords

  9. 3 November 2017 – 509 Iolanda Miss chord picks up the model shape well! 24 Positive observations!

  10. 6 December 2017 – 464 Magaira

  11. 10 December 2017 – 151 Abundantia European fit to chords requires elongated asteroid.

  12. 10 December 2017 – 151 Abundantia USA chord fit isn’t as good and requires a different shape. Model supplied by Josef Durech via email

  13. 21 December 2017 – 980 Anacostia

  14. 26 December 2017 – 65 Cybele

  15. 28 January 2018 – 259 Aletheia

  16. 4 February 2018 – 192 Nausikaa

  17. 7 February 2018 – 50 Virginia

  18. 9 February 2018 – 191 Kolga Double Star Aligned Fit

  19. 9 February 2018 – 191 Kolga Chord Fit to Primary

  20. 9 February 2018 – 191 Kolga Chord Fit to Secondary

  21. 9 February 2018 – 175 Andromache

  22. 10 February 2018 – 303 Josephina

  23. 21 February 2018 – 372 Palma

  24. 4 March 2018 – 505 Cava

  25. 5 March 2018 – 79 Eurynome

  26. 7 March 2018 – 32 Pomona

  27. 9 March 2018 – 2207 Antenor

  28. 12 March 2018 – 117 Lomia

  29. 18 March 2018 – 444 Gyptis

  30. Nice work by Everyone Involved !

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