Three positive chords were recorded by for this event.

View the updated prediction.

Observers:
  1    B Allen,Blenheim, NZ                 CCD-Drift
  2    D Gault,Hawkesbury Heights, NSW,AU   Video-OSD
  3    H Pavlov,Erskine Park, NSW, AU       Video-OSD
  4(M) D Herald,Taralga,NSW, AU             Video-OSD
  5(M) A Brakel,Downer,ACT,AU               Visual
  6(M) D Herald,Kambah, ACT, AU             Video-OSD
  7(P) Prediction, 22 Jan


    

Discussion:

The ellipse above is plotted at 170 x 159 km which has the same area as the expected 163 km diameter of Gyptis and the ellipse ratio implied by light curve data. With three chords plus a constraining miss we can be sure the path was north of the predicted central line of the event.

The figure below shows the data as analysed by Bill's Scanalyser software.

The following figures show Dave and Hristo's light curves.

Observational Data:

Observation details for MP (444) Gyptis
By Star              UCA 2U31864315
On 2009-02-06  at 15:46:32.0

_______________________________

Observer   Bill Allen
Location   Blenheim, NZ
Longitude  +173:50:21.4
Latitude   -41:29:30.
Altitude   38 m
Datum      WGS84
Telescope SCT including Cass and Mak
Aperture   40 cm
Seeing     Steady Clear
Timing     Tape Recorder + time signal Drift scan
Disappearance  15:44:21.66
Reappearance   15:44:30.87
Comments: Datum NZ1949 (topographical map) Very good observing conditions temp
19.6 with NW breeze. Half moon setting.
_______________________________

Observer   Dave Gault
Location   Hawkesbury Heights
Longitude  +150:38:27.8
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
Disappearance  15:46:23.94
Reappearance   15:46:33.44
Comments:
Also tried to observe at a mobile station but messed up finding the target.
_____________________

Observer   Hristo Pavlov
Location   Erskine Park
Longitude  +150:46:56.8
Latitude   -33:49:54.2
Altitude   77 m
Datum      WGS84
Telescope SCT including Cass and Mak
Aperture   20 cm
Seeing     Steady Clear
Timing     GPS - time inserted Video with frame analysis
Disappearance  15:46:23.37
Reappearance   15:46:32.93
Comments: WAT 120N+ 8 frame integration http://www.hristopavlov.net/Astronomy/Positives/2009-02-07%20Gyptis/Event.html

_______________________________

Observer   Dave Herald
Location   Taralga, NSW, AU
Longitude  +149:48:29.
Latitude   -35:20:48.
Altitude   904 m
Datum      WGS84
Telescope SCT including Cass and Mak
Aperture   20 cm
Seeing     Steady Thin cloud < 2
Timing     GPS - other linking Video with frame analysis

Missed

Comments:
_______________________________

Observer   Albert Brakel
Location   Downer (home)
Longitude  +149:08:18.
Latitude   -35:14:27.
Altitude   575 m
Datum      WGS84
Telescope SCT including Cass and Mak
Aperture   20 cm
Seeing     Steady Clear
Timing     Tape Recorder + time signal Visual, no PE applied

Missed

Comments: Some moonlight and light pollution. Star visible and steady,
but with averted vision throughout. The most detailed chart shows a pair of
stars close to the target location, but only one of these could be seen.
The chart suggests that the target star is the brighter one,
in which case I observed a miss.

_______________________________

Observer   Dave Herald
Location   Kambah, ACT, AU
Longitude  +149:03:49.
Latitude   -35:23:49.3
Altitude   580 m
Datum      WGS84
Telescope SCT including Cass and Mak
Aperture   35 cm
Seeing     Steady Clear
Timing     GPS - other linking Video with frame analysis

Missed

Comments: