1. 7 Months of Asteroidal Occultations in North America
September 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 Events September 2017 through March 31, 2018
10 September Ninina – 8 chords
9 October Nysa – 4 chords, model
23 October Bertha – USA/Europe, 7 chords, 2 models
3 November Iolanda – 2 chords, model
6 December Magaira – 3 chords
10 December Abundantia – USA/Europe, 7 chords, poor fit
21 December Anacostia – 3 chords
26 December Cybele – 3 chords, model
28 January Aletheia – 4 chords
4 February Nausikaa – 5 chords, model
7 February Virginia – 11 chords
9 February Kolga – 8 chords, new double
9 February Andromache – 4 chords
10 February Josephina – 8 chords
21 February Palma – 4 chords, model
4 March Cava – 4 chords, model
5 March Eurynome – 2 chords, model
7 March Pomona – 2 chords, model
9 March Antenor – 2 chords
12 March Lomia – 2 chords, model
18 March Gyptis – 4 chords

5. 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.

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 24 Positive observations!
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

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 !