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

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Presentation on theme: "Occultation observations from around the world July 2012 to Sept 2013 Dave Herald."— Presentation transcript:

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

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

3 # Observations by region Nth America458 Australasia1140 Japan4158 Europe1451 MiddleEast25

4 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

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 Australasia23 + 41(11 sites) Europe32 + 33(34 sites) Japan 7 + 14(14 sites) US27 + 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 Pluto 2012 Aug 6, Australia

16 521 Brixia 2012 Oct 22, USA

17 87 Sylvia 2013 Jan 6, Europe

18 45 Eugenia 2013 May 20, USA

19 576 Emanuela 2013 July 26, Australia

20 387 Aquitania 2013 Jul 26, USA

21 489 Comacina 2013 Aug 24, USA

22 139 Juewa 2013 Aug 31, Australia

23 Any questions?


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