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(693) Zerbinetta occults 4U 461-49902


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About this observation
Alex Pratt
Time of observation
08/03/2018 - 00:43
Asteroid (693) Zerbinetta and star 4U 461-49902
Observing location
C11 f/10 and f/3.3 focal reducer
Watec 910 video camera
IOTA-VTI GPS video time inserter
OccuRec recorder
Tangra and AOTA analysis
0.16s (4 integrated video frames)

The mag 13.6 82km diameter asteroid (693) Zerbinetta was predicted to occult the mag 13.9 star 4U 461-49902 on 2018 March 8. Their combined magnitude of 12.99 would drop by 0.5 mag for up to 5.5 seconds.

My observatory was inside the predicted shadow zone. The predicted probability of success at my site was 48.4% and I recorded an occultation duration of 4.80s. I watched the asteroid approaching the star, then they merged and the occultation occurred. The times of disappearance and reappearance were:-

D     00:42:58.44 +/- 0.08s

R     00:43:03.24 +/- 0.08s

The attached plot shows the analysis of the light curve using Tangra and AOTA software.

Another 5 stations across Europe were logged in OccultWatcher for this event, so we might have some chords across the asteroid's profile.

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