Occultation observations from around the world July 2012 to Sept 2013 Dave Herald

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

# Observations by region Nth America458 Australasia1140 Japan4158 Europe1451 MiddleEast25

Double star observations WDS stars measured78 Discoveries22 OCC stars +’ve measures7 Wide doubles (>2”)8 OCC stars NOT double99 WDS observed as single24 Doubtful16 TOTAL254 Reports collected and analysed by Brian Loader, New Zealand

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

The number of events is falling....

Number of successful events by region, and max # sites: 2012/ /08 Australasia (11 sites) Europe (34 sites) Japan (14 sites) US (11 sites) Japan has a much smaller land area than the other regions; Australasia has a much smaller population

Satellite discoveries #1 Agamemnom – 2012 Jan 19

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

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

7 double stars discovered since June 2012 Star number Sep (mas) P.A. Date Asteroid Aug Europa HIP ± ± Nov Sibylla 2U ± ± Dec Charybdis 2U ± ± Jan Merapi ± ± Feb 6 92 Undina Jul Isergina 2U Aug Valeria

Valeria Aug 15 Wide double star (380mas) Time diff: 66 secs

The 9 best results for the period

430 Hubris 2012 Aug 14, Europe

Pluto 2012 Aug 6, Australia

521 Brixia 2012 Oct 22, USA

87 Sylvia 2013 Jan 6, Europe

45 Eugenia 2013 May 20, USA

576 Emanuela 2013 July 26, Australia

387 Aquitania 2013 Jul 26, USA

489 Comacina 2013 Aug 24, USA

139 Juewa 2013 Aug 31, Australia

Any questions?