Occultation Observations Summary July 2012 - Sept 2013

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Delve into the intriguing world of occultation observations from July 2012 to September 2013, covering lunar occultations, double star observations, asteroidal occultations, and satellite discoveries. Explore the data collected from regions like North America, Australasia, Japan, Europe, and the Middle East, revealing the successes and challenges faced during this period. Discover the details of double stars discovered, satellite events, and the variations observed in different regions. Unveil the mysteries of celestial events captured during this significant timeframe.

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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 Australasia Japan Europe MiddleEast 458 1140 4158 1451 25

Double star observations Reports collected and analysed by Brian Loader, New Zealand WDS stars measured Discoveries OCC stars + ve measures Wide doubles (>2 ) OCC stars NOT double WDS observed as single Doubtful TOTAL 78 22 7 8 99 24 16 254

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: 2012/07 2013/08 Australasia Europe Japan US 23 + 41 32 + 33 7 + 14 27 + 50 (11 sites) (34 sites) (14 sites) (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 Double stars discovered in asteroidal occultations 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 7 double stars discovered since June 2012 since June 2012 Star number Sep (mas) P.A. Date Asteroid Star number Sep (mas) P.A. Date Asteroid 6223 6223- -00442 00442- -1 37.8 1 37.8 - -69.8 2012 Aug 12 52 69.8 2012 Aug 12 52 Europa Europa HIP104465 9.2 HIP104465 9.2 0.8 171.5 0.8 171.5 1.2 2012 Nov 25 168 1.2 2012 Nov 25 168 Sibylla Sibylla 2U42913552 28.2 2U42913552 28.2 0.5 107.6 0.5 107.6 3.6 2012 Dec 3 388 3.6 2012 Dec 3 388 Charybdis Charybdis 2U46691743 43.0 2U46691743 43.0 0.6 237.0 0.6 237.0 1.2 2013 Jan 27 536 1.2 2013 Jan 27 536 Merapi Merapi 1950 1950- -00148 00148- -1 28.3 1 28.3 0.4 12.3 0.4 12.3 0.8 2013 Feb 6 92 0.8 2013 Feb 6 92 Undina Undina 6258 6258- -00144 00144- -2 1.0 2 1.0 - -4.0 2013 Jul 24 1271 4.0 2013 Jul 24 1271 Isergina Isergina 2U30429828 380.0 240.0 2013 Aug 15 611 Valeria 2U30429828 380.0 240.0 2013 Aug 15 611 Valeria