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OCCULTATION OF TYC 2419-00637-1 BY 776 Berbericia
2009 January 06


A Positive observations were recorded by Chris Wyatt , using visual technique, and Dennis Lowe using video OSD technique.

View the updated prediction.

Observers:
  1(M) J Broughton,Reedy Creek, QLD , AU    CCD Drift
  2(M) J Broughton,Brunswick Heads, QLD , AU  Visual
  3    D Lowe,Leyburn, QLD, AU   Video OSD
  4    C Wyatt,Tenterfield, NSW,AU    Visual
  5(P) Predicted, 24 Dec 2008

    

Berbericia occultation - 2009 January 06

Discussion:

The ellipse above is plotted at the same area as expected 151 km diameter of Berbericia using light curve data predicting the ellipse shape from MPC.
With the two chords and the longer than maximum expected chord observed by Dennis we can be fairly sure that he was close to the central line of the event.
This makes Chris' times look about 1.5 secs out… However… have a look at a 3D model of Berbericia based on light curve data. If you rotate the 3rd shape shown in 3D and overlay to the plot of the observed data you get an approximation to what the the situation may have been below.
[Sorry about quality, but my software does make overlaying picutes easy-jt]

Berbericia collage - 2009 January 06

Observational Data:

Observation details for MP (776) Berbericia
By Star              TYC 2419-00637-1
On 2009-01-06  at 14:47:50.0

_______________________________

Observer   J Broughton
Location   Reedy Creek,Reedy Creek, QLD 4227, Australia
Longitude  +153:23:52.8
Latitude   -28:06:30.3
Altitude   66 m
Datum      WGS84
Telescope SCT
Aperture   25 cm
Seeing     Slight flickering Clear
Timing     Image analysis + time signal Drift scan

Missed

Comments:  Use of an old CCD camera lacking a working mechanical shutter
Use of an old CCD camera lacking a working mechanical shutter
for this unnattended drift scan inspired a new method involving
comparison of image coordinates with an image taken when I returned.
As the event was a certain miss, that step wasn't implemented.

_______________________________

Observer   J Broughton
Location   Brunswick Heads,Reedy Creek, QLD 4227, Australia
Longitude  +153:32:55.3
Latitude   -28:33:6.1
Altitude   2 m
Datum      WGS84
Telescope Dobsonian
Aperture   31 cm
Seeing     Steady Clear
Timing     Digital camera sound recorder Visual, no PE applied

Missed

Comments: Drift-through visual observation. A certain miss as the target
Drift-through visual observation. A certain miss as the target
was bright and any 1.3-magnitude drop would have been obvious.

_______________________________

Observer   Dennis Lowe
Location   Leyburn
Longitude  +151:34:2.7
Latitude   -27:58:58.3
Altitude   416 m
Datum      WGS84
Telescope Refractor
Aperture   10 cm
Seeing     Slight flickering Clear
Timing     GPS - time inserted Video with frame analysis
Disappearance  14:47:55.12
Reappearance   14:48:07.92

Comments:

_______________________________

Observer   Chris Wyatt
Location   Tenterfield, NSW
Longitude  +151:55:54.4
Latitude   -28:57:15.4
Altitude   827 m
Datum      WGS84
Telescope SCT including Cass and Mak
Aperture   20 cm
Seeing     Steady Thin cloud < 2
Timing     Tape Recorder + time signal Visual, PE applied
Disappearance  14:47:56.12
Reappearance   14:48:05.71

Comments: Thin cloud kept moving in and out of FOV whilst observing,
I sketched the star field of the star/asteroid and last noted a definite
split between them at 14h 28m UT before cloud intervened.
The cloud had broken in the region of the target star about 4 mins before
the occultation occurred, I had a comparison star in the FOV which I used
to determine if the target star had in fact been occulted or if it was
cloud interference, the occultation occurred without cloud interference.


    

Return to 2009 occultation results



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