Occultation were recorded by Dave Herald and Patrick Purcell

View the updated prediction.

Observers:
  1    D Herald,Kambah, ACT, AU
  2    P Purcell,Yass, NSW, AU
  3(M) D Gault,Hawkesbury Heights, NSW,AU
  4(P) Prediction, 19 Oct 2009
    

Discussion:

The ellipse above is plotted at the best fit to the observations. The 171:82km ratio may seem very high. However earlier occulation observations have reported chords above 150 km. An observation with two chords 2004 Septekmber 30 in Europe gave a ratio of 153:110 km and an observation with 9 chords 2005 June 5 in Japan gave a ratio of 145:130 km and a single chord by John Broughton 2007 January 27 measured 151 km.

The figure below shows the Dave's light curve of the occultation.

The figure below shows the Patrick's light curve of the occultation.

It is fair to say if this was the only report we would not be confident of the result.

Observational Data:

Observation details for MP (141) Lumen
By Star              TYC 0249-01307-1
On 2010-02-16  at 15:32:35.0

_______________________________

Observer   Dave Herald
Location   Kambah, ACT, AU
Longitude  +149:03:48.9
Latitude   -35:23:49.3
Altitude   582 m
Datum      WGS84
Telescope SCT including Cass and Mak
Aperture   35 cm
Seeing     Steady Broken cloud
Timing     GPS - time inserted Video with frame analysis
Disappearance  15:32:34.84
Reappearance   15:32:42.79
Comments:   Report prepopulated by IOTA Reporting Add-in for OW ver.1.4

_______________________________

Observer   Dave Gault
Location   Hawkesbury Heights, NSW,AU
Longitude  +150:38:28.
Latitude   -33:39:52.
Altitude   286 m
Datum      WGS84
Telescope Newtonian
Aperture   25 cm
Seeing     Steady Clear
Timing     GPS - time inserted Video with frame analysis

Missed

Comments: light curve and spreadsheet attached
Report prepopulated by IOTA Reporting Add-in for OW ver.1.4

_______________________________

Observer   Patrick Purcell
Location   Yass, NSW, AU
Longitude  +148:58:19.4
Latitude   -34:52:36.5
Altitude   531 m
Datum      WGS84
Telescope SCT including Cass and Mak
Aperture   20 cm
Seeing     Slight flickering Thin cloud < 2
Timing     GPS - time inserted Video with frame analysis
Disappearance  15:32:35.96
Reappearance   15:32:38.48
Comments:   Report prepopulated by IOTA Reporting Add-in for OW ver.1.4
Our interpretation, there was a cloud event lasting about 20 secs, with
the occultation occurring on the rise-section of the cloud event.