Two positive chaords were recorded by John Broughton, one using drift scan and using video OSD technique.

He also observed a clearly observed miss at another station.

View the updated prediction.

Observers:
  1    J Broughton,Reedy Creek, QLD, AU
  2    J Broughton,Chinderah, NSW, AU
  3(M) J Broughton,Pottsville, NSW, AU
  4(P) Prediction, May 18

    

Discussion:

The ellipse above is plotted at the same area as expected circle of 86km and with maximum axis ratio as determined by lightcurve inversion data. With two chords we can be confident of the path of Magdalena and that it was north of the predicted line.

The figures below show the drift-scan image of the occultation (1) together and the data as analysed by John's Scanalyser software.

The figure below shows the light curve of John's occultation (2).

Observational Data:

Observation details for MP (318) Magdalena
By Star              TYC 5739-02067-1
On 2011-06-26  at 19:07:08.0

_______________________________

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     Slight flickering Clear
Camera Type
Camera Delay
Timing     other Drift scan
Disappearance  19:07:11.33
Reappearance   19:07:16.75
Comments: Unattended drift scan. The camera lacks a working shutter and
couldn't be timed by the audio method. The timing was extrapolated from star
trails taken hours earlier, based on differences in apparent celestial
coordinates and CCD coordinates.
_______________________________

Observer   John Broughton
Location   Chinderah, NSW, AU
Longitude  +153:33
Latitude   -28:15
Altitude   5 m
Datum      WGS84
Telescope SCT including Cass and Mak
Aperture    9 cm
Seeing     Slight flickering Clear
Camera Type
Camera Delay
Timing     GPS - other linking Video with frame analysis
Disappearance  19:07:13.02
Reappearance   19:07:13.66
Comments: WAT120N+ x8 -0.19 applied. My pre-pointed C90 was left unattended
and was subject to partial dewing when I collected it two hours later.
Evidently it needs a longer dew shield. Although the star appears fainter
than intended, I believe that the short total disappearance seen on video is
real and the lightcurve supports that.
_______________________________

Observer   John Broughton
Location   Pottsville, NSW, AU
Longitude  +153:33
Latitude   -28:23
Altitude   7 m
Datum      WGS84
Telescope Newtonian
Aperture   31 cm
Seeing     Slight flickering Clear
Camera Type
Camera Delay
Timing     GPS - time inserted Video with frame analysis

Missed

Comments: