7 Months of Asteroidal Occultations in North America September 2017 through March 31, 2018 Brad Timerson

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

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

Best Observed Events September 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

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

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

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

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

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

6 December 2017 – 464 Magaira

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

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

21 December 2017 – 980 Anacostia

26 December 2017 – 65 Cybele

28 January 2018 – 259 Aletheia

4 February 2018 – 192 Nausikaa

7 February 2018 – 50 Virginia

9 February 2018 – 191 Kolga Double Star Aligned Fit

9 February 2018 – 191 Kolga Chord Fit to Primary

9 February 2018 – 191 Kolga Chord Fit to Secondary

9 February 2018 – 175 Andromache

10 February 2018 – 303 Josephina

21 February 2018 – 372 Palma

4 March 2018 – 505 Cava

5 March 2018 – 79 Eurynome

7 March 2018 – 32 Pomona

9 March 2018 – 2207 Antenor

12 March 2018 – 117 Lomia

18 March 2018 – 444 Gyptis

Nice work by Everyone Involved !