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Video astrometry of Potentially Hazardous Asteroid (162082) 1998 HL1

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About this observation
Observer
Alex Pratt
Time of observation
16/10/2019 - 20:53
Object
Potentially Hazardous Asteroid (162082) 1998 HL1
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
1.28s exposures
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This asteroid has an Amor-type orbit and the MPC categorise the object as PHA (Potentially Hazardous Asteroid). They comment that astrometry is useful for orbit improvement.

At mag 15 this was near my limit for video astrometry. Using an integration time of 1.28s I recorded some video sequences of 2 minutes' duration and submitted the following astrometry to the MPC

G2082  n2019 10 16.857533  22 02 04.12  +71 38 38.3  15.3 R  Z92
G2082  n2019 10 16.871226  22 02 31.49  +71 37 42.1  15.3 R  Z92
G2082  n2019 10 16.885752  22 03 00.57  +71 36 41.1  15.6 R  Z92

Analysis with Tangra gave the object's motion as 0.11"/sec (RA) and 0.05"/sec (Dec) equivalent to 7.25"/min, close to the MPC Ephemeris. It should reach its maximum sky motion of 22.5"/min on Oct 26 and a peak brightness of mag 12.4 on Oct 27.

If the monsoon season abates I hope to monitor this asteroid until at least the end of the month.

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