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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 America 458 Australasia 1140 Japan 4158 Europe 1451 MiddleEast 25.
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Occultation observations from around the worldJuly 2012 to Sept 2013 Dave Herald
Part 1 Lunar Occultations Summary of observations July 2012 – Sept. 2013
# Observations by region • Nth America 458 • Australasia 1140 • Japan 4158 • Europe 1451 • MiddleEast 25
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
Part 2 Asteroidal Occultations Summary of the best events Jul 2012 – Sept 2013
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
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 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
Valeria - 2013 Aug 15 Wide double star (380mas)Time diff: 66 secs