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Global Observations of Occultation Events July 2012 - September 2013

Comprehensive summary of occultation observations worldwide from July 2012 to September 2013, including lunar and asteroidal occultations, double star discoveries, and satellite observations. Data analyzed by experts, detailing significant events and discoveries during the period.

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Global Observations of Occultation Events July 2012 - September 2013

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  1. Occultation observations from around the worldJuly 2012 to Sept 2013 Dave Herald

  2. Part 1 Lunar Occultations Summary of observations July 2012 – Sept. 2013

  3. # Observations by region • Nth America 458 • Australasia 1140 • Japan 4158 • Europe 1451 • MiddleEast 25

  4. Double star observations Reports collected and analysed by Brian Loader, New Zealand • WDS stars measured 78 • Discoveries22 • OCC stars +’ve measures 7 • Wide doubles (>2”) 8 • OCC stars NOT double 99 • WDS observed as single 24 • Doubtful 16 TOTAL254

  5. Part 2 Asteroidal Occultations Summary of the best events Jul 2012 – Sept 2013

  6. The number of events is falling....

  7. Number of successful events by region, and max # sites: 2012/07 2013/08 • Australasia 23 + 41 (11 sites) • Europe 32 + 33 (34 sites) • Japan 7 + 14 (14 sites) • US 27 + 50 (11 sites) Japan has a much smaller land area than the other regions; Australasia has a much smaller population

  8. Satellite discoveries#1 Agamemnom– 2012 Jan 19

  9. Satellite discovery#2 Viipuri– 2013 Aug 3(?? - single integrated frame event)

  10. Double stars discovered in asteroidal occultations • New double stars can be discovered in an asteroidal occultation • Separations are usually in the range 0.1” to 0.001” • If several observers, the uncertainty in separation can be less than 1 milli-arcsecond

  11. 7 double stars discovered since June 2012 Star number Sep (mas) P.A. Date Asteroid 6223-00442-1 37.8 -69.8 2012 Aug 12 52 Europa HIP104465 9.2 ± 0.8 171.5 ± 1.2 2012 Nov 25 168 Sibylla 2U42913552 28.2 ± 0.5 107.6 ± 3.6 2012 Dec 3 388 Charybdis 2U46691743 43.0 ± 0.6 237.0 ± 1.2 2013 Jan 27 536 Merapi 1950-00148-1 28.3 ± 0.4 12.3 ± 0.8 2013 Feb 6 92 Undina 6258-00144-2 1.0 -4.0 2013 Jul 24 1271 Isergina 2U30429828 380.0 240.0 2013 Aug 15 611 Valeria

  12. Valeria - 2013 Aug 15 Wide double star (380mas)Time diff: 66 secs

  13. The 9 best results for the period

  14. 430 Hubris 2012 Aug 14, Europe

  15. Pluto2012 Aug 6, Australia

  16. 521 Brixia2012 Oct 22, USA

  17. 87 Sylvia2013 Jan 6, Europe

  18. 45 Eugenia2013 May 20, USA

  19. 576 Emanuela2013 July 26, Australia

  20. 387 Aquitania2013 Jul 26, USA

  21. 489 Comacina2013 Aug 24, USA

  22. 139 Juewa2013 Aug 31, Australia

  23. Any questions?

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