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Video astrometry of Near-Earth Object 2010 WC9

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About this observation
Observer
Alex Pratt
Time of observation
14/05/2018 - 22:00
Object
Near-Earth Object 2010 WC9
Observing location
Z92
Equipment
C11 f/10 with f/3.3 focal reducer
Watec 910 video camera
IOTA-VTI GPS time inserter
OccuRec (recorder)
Tangra (reduction)
Exposure
0.32s exposures
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This 50 to 120 metre wide Apollo-type asteroid was making a very close pass of the Earth and its closest approach would be late on May 15 when it was only half as distant as our Moon. UK observers got a good view of this Near-Earth Object on the previous evening when it was mag 14 and still over 600,000 miles away.

I recorded a number of 1-minute videos using OccuRec and they were measured using Tangra. The sky motion of 2010 WC9 was derived to be 0.01"/sec in RA and 0.42"/sec in Dec (increasing to 0.48"/sec), indicating that most of its motion was in Dec as it hurtled southward. The sky looked to be clear although I think some haze or thin cloud was present. The following astrometric results were submitted to the MPC.

K10W09C n2018 05 14.91644316 49 24.75 +13 12 10.3 14.1 R

K10W09C n2018 05 14.93724916 49 26.62 +12 59 05.9 14.6 R

K10W09C n2018 05 14.94618616 49 27.25 +12 53 18.5 14.7 R

K10W09C n2018 05 14.95798216 49 27.94 +12 45 29.2 14.0 R

K10W09C n2018 05 14.96846916 49 28.45 +12 38 22.0 14.7 R

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