Two possible chords was recorded for this event.

One clearly observed miss was also recorded for this event.

View the updated prediction.

Observers:
  1(M) A Walker,Tauranga / New Zealand
  2    B Allen,Blenheim, NZ   (drift scan)(Doubtful result - treated as "Not Seen")
  3    G McKay,Blenheim, NZ   (video OSD)
  4(P) Prediction, 23 August

        

Discussion:

The circle above is plotted at the expected 132 km diameter of Dynamene.

The figure below shows the Tangra light curve of Graeme's observation of the occultation.

Bill's dirftscan times needs to be adjusted by 16.5 seconds to align the two chords. It is considered that the star was too faint to get a reliable dritscan in a crowded field.

With only one chord it is not possible to determine whether Graeme was north or south of the central line of the event. Andrew's miss however constains the circle to being on the north west side of Graeme's position.

Observational Data:

Observation details for MP (200) Dynamene
By Star              UCA 2U40462405
On 2011-09-07  at 16:47:34.0

_______________________________

Observer   Andrew Walker
Location   Tauranga / New Zealand
Longitude  +176:09
Latitude   -37:42
Altitude   11 m
Datum      WGS84
Telescope Newtonian
Aperture   30 cm
Seeing     Steady Clear
Camera Type
Camera Delay
Timing     GPS - time inserted Video, photo or photoelectric

Missed

Comments: Magnification unknown, AE (Luton) 12 inch f5 using the WATEC 120N camera.

_______________________________

Observer   Bill Allen
Location   Blenheim, NZ
Longitude  +173:50
Latitude   -41:29
Altitude   38 m
Datum      WGS84
Telescope SCT including Cass and Mak
Aperture   40 cm
Seeing     Steady Clear
Camera Type
Camera Delay
Timing     Tape Recorder + time signal Drift scan
Disappearance  16:46:39.91
Reappearance   16:46:53.30
Comments: Datum NZ1949 (topographical map) Good observing conditions air mass 2.48
Automatic synchronisation of Timer Box with Beppersync to within 0.01second.
(It is considered that the star was too faint to get a reliable dritscan in a crowded field. - jt)

_______________________________

Observer   Graeme McKay
Location   Blenheim,NZ
Longitude  +173:57
Latitude   -41:32
Altitude   18 m
Datum      WGS84
Telescope SCT including Cass and Mak
Aperture   20 cm
Seeing     Steady Clear
Camera Type  WAT120N        PAL/CCIR
Camera Delay 0.33
Timing     GPS - time inserted Video with frame analysis
Disappearance  16:46:57.99
Reappearance   16:47:09.60
Comments: Observing conditions good. Target star easily found and identified.
Correction time and tolerance values from "Gerhard_Dangl_Video_Measurements" webpage
Report prepopulated by IOTA Reporting Add-in for OW ver.1.6