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OCCULTATION OF TYC 1477-00531-1 BY 350 Ornamenta
2010 April 08


An 8.9 second occultation was recorded by Chris Wyatt, using visual technique.

View the updated prediction.

Observers:
  1    C Wyatt,Walcha, NSW, AU
  2(M) B Loader,Darfield,NZ
  3(P) Prediction 4 April


    

Ornamenta occultation - 2010 April 08

Discussion:

The circle above is plotted at the expected 108 km diameter of Ornamenta. With only one chord it is not possible to determine whether Chris was north or south of the central line of the event. However, assuming the updated prediction was approximately correct the longer than expected chord of about 130km would suggest that the chord might lie close to the central portion of the asteroid.

The following picture shows the shape of Ornameneta as calculated from long term lightcurve data at the DAMIT data base. It is probable that Chris observed one of the longer dimensions.

Ornamenta occultation - 2010 April 08

Observational Data:

Observation details for MP (350) Ornamenta
By Star              TYC 1477-00531-1
On 2010-04-08  at 15:16:00.0

_______________________________

Observer   Chris Wyatt
Location   Walcha, NSW, AU
Longitude  +151:50:19.
Latitude   -31:01:11.
Altitude   1250 m
Datum      WGS84
Telescope SCT including Cass and Mak
Aperture   20 cm
Seeing     Steady Clear
Timing     Tape Recorder + time signal Visual, PE applied
Disappearance  15:15:54.81
Reappearance   15:16:03.71
Comments: My reaction time was good,
possibly better than my average 0.4 second PE
The background stars remained steady throughout the event,
the star disappeared and reappeared cleanly.

_______________________________

Observer   B. 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 Clear
Timing     GPS - time inserted Video with frame analysis

Missed

Comments: Two possible blinks at the predicted time of the event.
Most probably just noise.  Light curves attached to email.
[Having reviewed the lightcurves and the relationship with Chris's
observations I have concluded that these are noise - jt]
Report prepopulated by IOTA Reporting Add-in for OW ver.1.4

    

Return to 2010 occultation results



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