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OCCULTATION OF UCAC2 12989796 BY 285 Regina
2008 June 13


Two positive observations were made for this event.

View the updated prediction.

Observers:
  1(M) J Broughton,Reedy Creek, QLD,AU      - CCD
  2    P Anderson,Taylor Range Obs,QLD,AU   - Visual
  3    J Bradshaw,Samford,QLD,AU            - Video
  4(P) Prediction 13 May                    


Regina occultation - 2008 June 13

Discussion:

The circle above is plotted at the expected 45 km diameter of Regina. With two chords we can be reasonably sure that the plot represents a good estimate of the event location.

The figures below shows the lighcurve of Jonathan Bradshaw's chord of the occultation from Limovie software.

Regina occultation - 2008 June 13

Observational Data:


Observation details for MP (285 ) Regina
By Star              UCAC2 12989796
On 2008-06-13  at 13:05:53.0
_______________________________

Observer   John Broughton
Location   Reedy Creek
Longitude  +153:23:52.8
Latitude   -28:06:30.3
Altitude   66 m
Datum      WGS84
Telescope Newtonian
Aperture   51 cm
Seeing     Steady Clear
Timing     Tape Recorder + time signal + shutter Drift scan

Missed

Comments: A definite miss.

_______________________________

Observer   Peter Anderson
Location   Taylor Range Observatory
Longitude  +152:56:1.5
Latitude   -27:27:47.6
Altitude   176 m
Datum      WGS84
Telescope Newtonian
Aperture   41 cm
Seeing     Slight flickering Clear
Timing     Tape Recorder + time signal Visual, PE applied
Disappearance  13:05:51.30
Reappearance   13:05:55.00
Comments: I found the star easier to locate than I thought. 
At mv 12.0 in bright 
moonlight the image could be 'held' but not with ease, 
to the extent that if there had been 
a 0.2 second event, 
it could have been missed. However the event was obvious and I don't 
think 
I glimpsed the asteroid during disappearance.  The star just 
'went out'.  
I know this sounds silly, 
but if it is not obvious you are concentrating 
on waiting for the reappearance a few seconds later
rather than trying 
averted vision if the asteroid is not obvious. This period is one of 
heightened 
tension with the comparison star continually being monitored 
because this references the position 
of the occulted star.

_______________________________

Observer   Jonathan Bradshaw
Location   Samford, Queensland, Australia
Longitude  +152:52:22.7
Latitude   -27:21:22.8
Altitude   95 m
Datum      WGS84
Telescope Dobsonian
Aperture   50 cm
Seeing     Steady Clear
Timing     GPS - time inserted Video with frame analysis
Disappearance  13:05:52.14
Reappearance   13:05:55.62
Comments: An unexpected treat!  Watch on youtube

Return to 2008 occultation results



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