This prediction update has been computed by Graham Blow based on astrometry from Alex Liu in Western Australia. The ACT position of the star has been used.

Summary:

The updated track is shifted over 1" north and directly crosses Bundaberg, Queensland. (However, note that reduction of the asteroid astrometry has been carried out against GSC stars).

The event time is as predicted by both Goffin and OCCULT; about 12h 23m for Bundaberg.

THE EVENT AT ONE GLIMPSE:

• Date and approx. UT time of event: August 17, 1999 @ 12:23 UT (Bundaberg)
• Magnitude of target star: 10.27
• Magnitude drop [mag]: 1.1
• Estimated maximum duration [s]: 13.5
• Path description: Crosses Queensland in the region of Bundaberg

• Name: TYC 6404 00155
• J2000 position [h,m,s; o,',"]: 23h 43m 16.043s; -15^o 46' 43.82"
• Position source: ACT
• V mag [mag]: 10.27

• Number, name: (346) Hermentaria
• Approx. diameter [km]: 110
• Source of used astrometry: Exmouth (Alex Liu)
• Number of used observations: 6
• Number of rejected observations: 0
• Time covered by the observations: 1999 08 15

• UT date and time of least geocentric approach: 12:13.6 UT
• Approx. V mag of minor planet at event [mag]: 10.93
• Geocentric parallax of minor planet ["]: 5.37
• Magnitude drop [mag]: 1.1
• Estimated maximum duration [s]: 13.5
• Apparent motion of minor planet ["/h]: 24.74
• Angular distance to moon, phase of moon [deg,%]: 133, 35%

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.