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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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Presentation Transcript
part 1
Part 1

Lunar Occultations

Summary of observations

July 2012 – Sept. 2013

observations by region
# Observations by region
  • Nth America 458
  • Australasia 1140
  • Japan 4158
  • Europe 1451
  • MiddleEast 25
double star observations
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
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
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

double stars discovered in asteroidal occultations
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
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