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Occultation observations from around the world Jan 2011 to Jun 2012

Occultation observations from around the world Jan 2011 to Jun 2012. Dave Herald. Part 1. Lunar Occultations. Summary of observations Jan. 2011 – Jun. 2012. # Observations by region. Nth America 357 Australasia 1201 Japan 928 Europe 2082 MiddleEast 88. # Reported Grazes by region.

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Occultation observations from around the world Jan 2011 to Jun 2012

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  1. Occultation observations from around the worldJan 2011 to Jun 2012 Dave Herald

  2. Part 1 Lunar Occultations Summary of observations Jan. 2011 – Jun. 2012

  3. # Observations by region • Nth America 357 • Australasia 1201 • Japan 928 • Europe 2082 • MiddleEast 88

  4. # Reported Grazes by region • Nth America 2 • Australasia 10 • Japan 12 • Europe 10 • Middle East 2 • Total 36

  5. Grazes with 5 or more observers 2011 Apr 23 – Australia (5) 2011 Sep 17 – Australia (6) 2011 Aug 24 – Europe (5) 2012 Jan 29 – Japan (6)

  6. Grazes by number of events (>10) • Date # events Region (# observers) • 2011 Sep 17 42 Australia (5) • 2011 Apr 8 36 Australia (3) • 2011 Nov 3 36 Japan (4) • 2011 Aug 22 34 USA (2) • 2011 Aug 24 31 Europe (5) • 2011 Oct 3 30 Japan (3) • 2012 Jan 29 28 Japan (6) • 2011 Mar 13 27 Japan (2) • 2011 Mar 11 20 Europe (2) • 2011 Dec 10 16 Japan (2) • 2012 Feb 4 14 Japan (1) • 2012 Apr 1 14 USA (1) • 2012 Apr 29 13 Europe (1) • 2011 May 7 12 Japan (1) • 2011 Jun 23 12 Australia (1) • 2012 Jan 29 12 Europe (1)

  7. Double star observations Reports collected and analysed by Brian Loader, New Zealand • # positive measures 94 • # doubtful doubles 30 • # definite ‘not double’ 58 • # wide doubles 22

  8. Some double star solutions R3287 S97067 S96610 S76152

  9. Part 2 Asteroidal Occultations Summary of the best events Jan 2011 – June 2012

  10. The number of events has flattened off…

  11. Number of successful events by region, and max # sites: 2011/01 2012/06 • Australasia 51 + 29 (7 sites) • Europe 51 + 31 (19 sites) • Japan 25 + 21 (25 sites) • US 76 + 27 (57 sites) Japan has a much smaller land area than the other regions; Australasia has a much smaller population

  12. 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

  13. 7 double stars discovered since Jan 2011 Star number Sep (mas) P.A. Date Asteroid HIP46249 6.5 ± 1.1 50.2 ±12.2 2011 Jan 24 160 Una 1866-01091-1u 12.5 34.0 2011 Sep 13 177 Irma 2849-00430-1 0.6 68.4 ± 3.3 2012 Jan 13 759 Vinifera HIP41337 93.0 93.0 2012 Jan 19 911 Agamemnon 1865-01119-1 23.0 99.0 2012 Feb 18 177 Irma 0126-00781-1 3.5 ± 1.0 38.3 ±14.6 2012 Mar 11 57 Mnemosyne 6273-01033-1 36.0 151.0 2012 Mar 20 44 Nysa

  14. 90 Antiopehow good does it get!

  15. Star diameter from 90 Antiope • Dia from 61 light curves : 2.14  0.03 mas • For ‘complex’ occultations, correct interpretation of a light curve may depend on results from adjacent chord => need to ensure data is available for re-analysis.

  16. 212 Medea 2011 Jan 8, Japan

  17. 144 Vibilia2011 Jan 25, Europe

  18. (11) Parthenope2011 Jan 26, USA

  19. (554) Perega2011 Mar 08, Europe

  20. (360) Carlova2011 Aug 15, USA

  21. (156) Xanthippe2011 Dec 26, ES + US

  22. (329) Svea2011 Dec 28, Japan

  23. (705) Erminia2012 Jan 2, Japan

  24. (654) Zelinda2012 Jan 6, Japan

  25. (266) Aline2012 Jan 17, Japan

  26. (57) Mnemosyne2012 Mar 11, USA

  27. (128) Nemesis2012 Mar 30, Australia

  28. (1030) Vitja2012 Apr 28, CA + US

  29. Any questions?

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