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Asteroidal Occultations around the world Summary of the best events in last 2 years.

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Presentation on theme: "Asteroidal Occultations around the world Summary of the best events in last 2 years."— Presentation transcript:

1 Asteroidal Occultations around the world Summary of the best events in last 2 years

2 The number of events continues to grow…

3 Number of successful events by region, and max # observers Australasia50(5 obs, 6 stns) Europe51(231 obs) Japan25(34 obs) US106(14 obs, 18 stns) Japan has a much smaller land area than the other regions; Australasia has a much smaller population

4 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 If several observers, the uncertainty in separation can be less than 1 milli- arcsecond

5 9 double stars discovered in last 24 months Star number Sep ( ) P.A. Date Asteroid ± ± Apr Lacadiera ± ± Jul Pretoria ± ± Jul Tjilaki HIP Sep Arabia ± Nov 9 79 Eurynome ± ± Jun Bohemia Aug Bella 2U ± ± Oct Ludmilla HIP ± ± Jan Una

6 An odd-shaped asteroid - or – (234) Barbara has a heart 2009 Nov 21, Florida + Germany 28 stations – but only 13 observers – Degenhardt – 7 stations – Dunham – 4 stations – Maley – 5 stations – Venable – 3 stations

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8 Issues with Barbara Asteroid may be a contact binary asteroid There were timing issues with a couple of critical observations – which were resolved.

9 Roma occults δ Oph 2010 Jul 08 Path crossed Europe Star mag 2.9 => naked eye event Star has a significant diameter Over 230 separate observations - most ever.

10 Star had a large diameter… Star dia : Asteroid dia : All events were gradual

11 Roma – sample light curve

12 Roma – fit is poor because of inconsistent light levels used for event times

13 Roma profile using good observations

14 Other well-observed events A selection of the best observed events that show the profile of the asteroid.

15 709 Pretoria

16 (449) Hamburga

17 (216) Kleopatra (the dog-bone asteroid)

18 (81) Terpsichore

19 (80) Sappho

20 (16) Psyche (timing issue with one chord)

21 (695) Bella

22 (96) Aegle

23 (93) Minerva

24 (212) Medea

25 (160) Una

26 (11) Parthenope (timing issues)


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