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Video photometry of Near-Earth Asteroid 2014 JO25

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About this observation
Observer
Alex Pratt
Time of observation
19/04/2017 - 00:00
Object
Asteroid 2014 JO25
Observing location
Z92
Equipment
C11 f/10 @ f/3.3
Watec 910 video camera
IOTA-VTI GPS time inserter
Tangra software
Exposure
0.32s, 0.16s and 0.08s integrations
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During the nights of April 18/19, 19/20 and 20/21 I was able to take advantage of interludes of clear sky to record 30 videos of the flyby of this Potentially Hazardous Asteroid (PHA).

A sample 20MB video clip is available here. (The asteroid is just below the centre of the field, moving towards the top right).

The light curve from April 18/19 shows the R magnitude of the Apollo asteroid derived from video data. The black line is the predicted V magnitude from the MPC ephemeris. It steadily increased in apparent brightness as it neared the Earth. The dip to mag 14 - 14.5 is most likely spurious, caused by intermittent haze / thin cloud. 

The latest radar data shows the rotation of the peanut-shaped asteroid. It will be interesting to see if other observers confirm the sinusoidal variations in the light curve or if they are artefacts caused by the variable sky conditions.

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