Observation by Alex Pratt: Video photometry of Near-Earth Asteroid ...

Uploaded by

Alex Pratt

Observer

Alex Pratt

Observed

2017 Apr 18 - 23:00

Uploaded

2017 Apr 28 - 17:20

Objects

2014 JO25
Lightcurve

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Constellation

Grus

Field centre

RA: 22^h44^m
Dec: -46°51'
Position angle: +9°40'

Field size

0°09' × 0°05'

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

Location

Z92

Target name

Asteroid 2014 JO25

Title

Video photometry of Near-Earth Asteroid 2014 JO25

About this image

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.

Files associated with this observation

2014 JO25_20170419_0000_Z92_ARP_0.png (14.9 kB)

Like this image

Jeremy Shears, David Basey, Andy Wilson, Graham Winstanley, Peter Carson

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