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Small magnitude drop during an occultation

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About this observation
Observer
Tim Haymes
Time of observation
02/04/2019 - 00:28
Object
(554) Peraga and *UCAC4 395-054740
Observing location
Knowl Hill, Berks, UK
Equipment
203mm F/4 SN8
EQ6pro / EQMOD
WAT-910HX video
SPRITE2-u GPSVTI
Exposure
160ms
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This is the light curve measured with the Occult4 tool: AOTA.  Its a bit weak because the predicted drop in magnitude from star+asteroid (v12.4), to asteroid was small and noisy at 0.2 mag. This is close to the 8bit video limit for an  8" scope.  The duration at my position was 7 to 8 seconds, and was confirmed by some nearby astro-pals with larger apertures. So i'm confident this was real, albeit with large uncertainty in exact duration. The chord results can be seen on Eurster.net  courtesy of Eric Frappa

http://www.euraster.net/results/2019/20190402-Peraga_crd.gif

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