A disappearance only event was recorded by Brian Loader, using video OSD technique.

View the updated prediction.

Observers:
  1(M) G Blow,Khandallah, Wellington,NZ
  2    B Loader,Darfield,NZ
  3(P) Prediction,  2 Sept
    

Discussion:

The circle above is plotted at the expected 100 km diameter of Isis. With only one end of the chord observed it is not possible to determine where Brian was on the path of the event. This unceratinty means that we have to plot the circle on the observed D event location and the uncertainty of the centre is effectively the expected radius i.e +/- 50 km.

Observational Data:

Observation details for MP (42) Isis
By Star              TYC 6409-00179-1
On 2009-09-15  at 16:08:59.0

_______________________________

Observer   Brian Loader
Location   Darfield,NZ
Longitude  +172:06:24.4
Latitude   -43:28:52.9
Altitude   210 m
Datum      WGS84
Telescope SCT including Cass and Mak
Aperture   25 cm
Seeing     Slight flickering Thick cloud > 2
Timing     GPS - time inserted Video with frame analysis
Disappearance  16:08:57.00
Reappearance   00:00:00.00
Comments: Thickening cloud forced use of Watec 120N camera;
integration had to be increased from 32x to 64x at 16:08:21.
A probable disappearance recorded.
Timing accuarcy ±2 seconds at 64 fold integration.
Star image lost at ca 16:09:10 as cloud thickened,
so any reappearance unobserved.
_______________________________

Observer   Graham Blow
Location   Khandallah, Wellington,NZ
Longitude  +174:48:15.1
Latitude   -41:14:43.
Altitude   127 m
Datum      WGS84
Telescope SCT including Cass and Mak
Aperture   20 cm
Seeing     Slight flickering Clear
Timing     GPS - time inserted Video with frame analysis

Missed

Comments: