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OCCULTATION OF UCAC2 29556531 BY 805 Hormuthia
2014 August 28

A 6.16 second occultation was recorded by Bill Hanna, using Video OSD technique.

No clearly observed misses were recorded for this event.

View the updated prediction.

  1    W Hanna,Alice Springs, Australia     
  2(P) Prediction, 01 April                 


Hormuthia occultation__ 2014 August 28


The circle above is plotted at the expected 79 km diameter of Hormuthia. The predicted time of the event was about 100 seconds (about 6 sigma) from the observation so the gap on the predicted line is off the plot. With only one chord it is not possible to determine whether Bill was north or south of the central line of the event.
This illustrates why observers should try to record or observe for significantly longer in time, and wider in space, than the 1 sigma error given in the predictions. You just never know when you might get lucky. Also remember that any moonlets of asteroids are usually found at around 10 to 15 times the diameter of the main object.

The figure below shows the Tangra light curve of the occultation.

Hormuthia occultation__ 2014 August 28

Observational Data:

Observation details for MP ( 805 ) Hormuthia
By Star              UCAC2 29556531
On 2014-08-28  at 11:04:58.0


Observer   William Hanna
Location   Alice Springs, Australia
Longitude  +133:53
Latitude   -23:42
Altitude   584 m
Datum      WGS84
Telescope SCT including Cass and Mak
Aperture   36 cm
Seeing     Steady Clear
Camera Type  Grasshopper Express with ADVS              ADVS
Camera Delay 0
Timing     GPS - time inserted Video with frame analysis
Disappearance  11:06:06.65
Reappearance   11:06:12.81
Comments: Gamma 1.0, gain 29dB Calm, 19C. 


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