The Review of the Archive of Lunar Graze Observations

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The Reviewof theArchive of Lunar Graze
Observations

• Presented at
• Trans Tasman Symposium on Occultations - 4
• (March 2010 Canberra Australia)
• and
• IOTA AGM
• (December 2010 Boston U.S.A.)
• By Dave Gault
• and on behalf of
• Dave Herald

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The Plan

• Merge all known collections of graze
  observations. into one collection.
  (RGO - Computer
  Records, RGO Grazes (OCRd), Occult, ILOC,
  Soma)
• Occult Dave Herald developed tools and
  functionality to handle the review.
• and then
• Restore lost data for grazes pre 1974
  (observers Unknown A, B,C,D ect).
  Ken Coles at Indiana Univ. of
  Pennsylvania has David Dunhams files he
  collected while at USNO
• Review and correct errors, syntax, mark
  duplicated data and set invalid events.
• Find previously unreported grazes and create new
  reports to add to the archive.

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The Graze Editor (before work)
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The Graze Editor - Reviewed
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Restoring the pre 1974 dataViews of the work of
Ken Coles

• 85 of grazes before 1970 restored and reviewed
• 49 new previously unreported grazes now
  incorporated in the archives

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Kaguya (Selene) Databecomes available

• 6 months into the review the Kaguya (Selene) data
  becomes available for download
• Dave Herald updated Occult to use Kaguya Data in
  observed limb plots and predictions
• This caused a re-review of all grazes already
  processed

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A first! - Mobile Graze Observers,observing
events at the Dark Limb
The first successful dark limb graze where the
observers travelled to their sites - 1963
September 8th Graze of
ZC 464, Davis, California
Fully Restored
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High school students open the eyes of USNO
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The illegitimate delta Cancri grazenow
legitimate!
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Occultation DetectiveQuick Cases Solved
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Occultation Detective - tough casesA difficult
Brief
Observed with the Milwaukee Graze Cable Gary
Samolyk the organiser
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Occultation Detective..Case Solved
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Some grazes remain unsolved
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More site errors or star error?The jury is out!
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True star coordinate errorsexpect a paper about
this!
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Missing Graze Reports

• Lunar Eclipse graze of alpha Librae
• 5 expeditions of 35 observers at the southern
  limit recorded 198 events!
• Meanwhile
• 8 observers flew from the USA to Sudan to observe
  at the northern limit.
• No events in the archives and the reports are
  still missing!

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Summary

• Total number of Grazes Reviewed 3618
• Total number of events considered 64989
• Number of new (previously unreported) grazes
  found, reports created, double checked and merged
  into the archive 193
• Hours invested in this project? dont ask! ?
• Number of graze reports lost for all time who
  knows?
• The complete lunar archive is now archived at

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The End

• Questions?