This prediction update has been computed by Stephen Kerr based on astrometry from Ron Stone of the US Naval Observatory - Flagstaff Station. The Hipparcos position of the target star has been used.

Summary:

This update indicates a shift in the predicted path to the north-west of around 0.2" and around 30 seconds later than as predicted by Edwin Goffin. The path now crosses the Western Australian coastline just to the south of Geraldton (11:38 UT) running towards the north-east. The path runs just to the east of Paraburdoo and Tom Price and emerges across the coastline again to the east of Port Hedland (11:40:40 UT).

• Date and approx. UT time of event: August 21, 2000 @ 11:37 UT
• Magnitude of target star: 9.59
• Magnitude drop [mag]: 4.1
• Estimated maximum duration [s]: 13.6
• Path description: See above.
• Goffin's original chart reference: A00_0813

• Approximate width [km]: 95
• Map: See below
• Circles along the path are OCCULT calculated exact centerline points !!!!

• Name: HIP 88299 = PPM 749319 = HD 164296 = GSC 7399 722
• Constellation: Sagittarius
• J2000 position [h,m,s; ^o,',"]: 18h 01m 55.263s; -34^o 08' 10.40"
• Position source: Hipparcos
• V mag [mag]: 9.59
• B-V [mag]: +0.64
• Remarks:
• The target star is in far western Sagittarius near the border with Scorpius. In a very crowded field, the target star is around 1.8 degrees to the north east of the very bright open cluster Messier 7 in Scorpius. The target star does have a fairly close and faint companion - GSC 7399 278 (magnitude = 12.0) only 43" to the north-east.

• Number, name: (143) Adria
• Approx. diameter [km]: 92.8
• Source of used astrometry: US Naval Observatory - Flagstaff Station (Ron Stone)
• Number of used observations: 21
• Number of rejected observations: 0
• Time covered by the observations: 2000 05 31 - 2000 08 02

• UT date and time of least geocentric approach: 2000 August 21, 11:37.0 UT
• Approx. V mag of minor planet at event [mag]: 13.71
• Geocentric parallax of minor planet ["]: 4.41
• Magnitude drop [mag]: 4.1
• Estimated maximum duration [s]: 13.6
• Apparent motion of minor planet ["/h]: 16.94
• Angular distance to moon, phase of moon [deg,%]: 130, 64%
• Update computed by: Stephen Kerr - Win Occult 1.2

IMPORTANT NOTE!

Astrometric updates such as these should not be taken as definitive, but rather only as an indication of where the true track may lie relative to the original predicted track. Observers must bear in mind that later astrometry, in which the target star is measured in the same field as the asteroid, may still reveal substantial changes to the predicted track and time of the event. For this reason it is most important that observers far from the predicted track still monitor the event.