Summary of 2015 2016 Asteroidal Occultations in North

Summary of 2015 - 2016 Asteroidal Occultations in North America September, 2015, through July 25, 2016 Brad Timerson

Asteroidal Occultation Observations

Asteroidal Occultations by Number of Chords

Best Observed Events September 2015 through July 25, 2016 n n n n 4 September 2015 2 October 2015 22 October 2015 5 December 2015 30 December 2015 14 January 2016 22 January 2016 14 February 2016 16 February 2016 11 March 2016 19 March 2016 5 April 2016 7 July 2016 21 July 2016 409 Aspasia – 5 chords, model 233 Asterope – 2 chords, model 247 Eukrate – 3 chords, model 109 Felicitas – 3 chords 96 Aegle – 8 chords 1315 Bronislawa – chord, graze 115 Thyra – 6 chords, model 952 Caia – 5 chords 130 Elektra – 2 chords, model 63 Ausonia – 2 chords, model 695 Bella – 2 chords (new double), model 216 Kleopatra – 7 chords, model 2 Pallas – 3 chords, model 107 Camilla – 6 chords, model

4 September 2015 – 409 Aspasia Chord 3 duration well known, but absolute time in question.

2 October 2015 – 233 Asterope

22 October 2015 – 247 Eukrate

5 December 2015 – 109 Felicitas

30 December 2015 – 96 Aegle

14 January 2016 – 1315 Bronislawa

22 January 2016 – 15 Thyra

14 February 2016 – 952 Caia

16 February 2016 – 130 Elektra

11 March 2016 – 63 Ausonia

19 March 2016 – 695 Bella

5 April 2016 – 216 Kleopatra

Kleopatra

Ostro Radar Model

7 July 2016 – 2 Pallas

21 July 2016 – 107 Camilla Model fit at the published period. 4. 843928 hrs.

21 July 2016 – 107 Camilla Period adjusted to be 0. 15 hours earlier than published period. New Period = 4. 843930 hrs.

21 July 2016 – 107 Camilla Period adjusted with 2 possible solutions. (D. Herald)

21 July 2016 – 107 Camilla Using another observation, the shorter period can be eliminated.

Conclusion For these two events, the 1 st option (with a period of 4. 843932 hr) results in a good fit to both occultation events. However the 2 nd option (with a period of 4. 843898 hr) does not provide a good fit to both events. On this basis we determine rotation period for 107 Camilla is 4. 843932 hr, assuming a zero epoch of 2444636. 814850. This is a correction of +0. 000004 hr (0. 014 sec) to the DAMIT period. (D. Herald)

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