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Video astrometry of Near-Earth Asteroid (3122) Florence

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About this observation
Observer
Alex Pratt
Time of observation
31/08/2017 - 21:01
Object
Asteroid (3122) Florence
Observing location
Z92
Equipment
C11 /f10 @ f/3.3
Watec 910 video camera
IOTA-VTI GPS time inserter
Virtual Dub and Tangra
Exposure
0.16s exposures
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This Amor-type Potentially Hazardous Asteroid (PHA) is currently doing a flyby of Earth. It's now a mag 9 target for observers in the northern hemisphere and will still be visible at Christmas, when it will have faded to mag 15. It's an ideal object for astrometry and photometry, the latter to obtain lightcurves to model its shape profile. It's a radar target for professional radio telescopes.                                        

I'll be using (3122) Florence as a test object to compare the astrometric O-Cs derived from recordings made with VirtualDub and with OccuRec, and reduced in Tangra. Previous NEOs gave slight differences between the two methods.                                            

The MPC ephemeris for the night of Aug 31 gave a sky motion of 23.5"/min (0.39"/sec). My results gave a value of 0.39"/sec, with 0.10"/sec in RA and 0.38"/sec in Dec and the following sample astrometry from 200 measurements from one of the 1 min videos

03122  n2017 08 31.87568321 04 41.53 -03 22 48.2           9.7 R      Z92

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