Two positive chords were recorded by John Broughton, using video OSD technique

and one clearly observed miss was recorded for this event.

View the updated prediction.

Observers:
  1    J Broughton,Wooyung, NSW, AU
  2    J Broughton,Reedy Creek, QLD, AU
  3(M) J Bradshaw,Samford,QLD,AU
  4(P) Prediction, 17 March

    

Discussion:

The ellipse above is plotted at a fit that has about right area and fits the data. With two chords and a constraining miss we can be confident of the path of Niobe and that it was a little south of the predicted line.

The figures below shows the Tangra light curves of the occultation. The noisy signals are due to the low magnitude of the star and brighter magnitude of Niobe giving a drop of only 0.2.

Observational Data:

Observation details for MP (71) Niobe
By Star              UCAC2 11093045
On 2011-04-09  at 09:21:05.0

_______________________________

Observer   John Broughton
Location   Wooyung, NSW, AU
Longitude  +153:31
Latitude   -28:27
Altitude   2 m
Datum      WGS84
Telescope Newtonian
Aperture   31 cm
Seeing     Steady Clear
Camera Type
Camera Delay
Timing     GPS - other linking Video with frame analysis
Disappearance  09:21:04.77
Reappearance   09:21:10.53
Comments: WAT120N+ x4 -0.11 applied

_______________________________

Observer   John Broughton
Location   Reedy Creek, QLD, AU
Longitude  +153:23
Latitude   -28:06
Altitude   66 m
Datum      WGS84
Telescope SCT including Cass and Mak
Aperture   25 cm
Seeing     Steady Clear
Camera Type
Camera Delay
Timing     GPS - time inserted Video with frame analysis
Disappearance  09:21:06.22
Reappearance   09:21:12.94
Comments: WAT120N+ x4 -0.11 applied

_______________________________

Observer   Jonathan Bradshaw
Location   Samford,QLD,AU
Longitude  +152:50
Latitude   -27:22
Altitude   80 m
Datum      WGS84
Telescope Newtonian
Aperture   36 cm
Seeing
Camera Type
Camera Delay
Timing     GPS - time inserted Video with frame analysis

Missed

Comments: