THE UPDATED PATH

This updated path lies around 0.3" to the north of that given by Goffin and around 30 seconds earlier. The new path runs from the far south west of Queensland past Charleville to the coast between Rockhampton and Gladstone (9:02:15 UT).

The uncertainties of this new path are unusually large as the astrometry is poorer than typically received. This is due to the far southern declination of (1042) Amazone in recent months such that observations from Flagstaff, Arizona have been made at low altitude. Brisbane certainly lies well within the error margin at 9:02 UT.

Calculation Source

This prediction update has been computed by Steve Kerr of Rockhampton, Queensland Australia based on astrometry from Ron Stone of the US Naval Observatory - Flagstaff Station. The UCAC position of the target star has been used.

• Date and approx. UT time of event: 2001 October 17: 9:02 UT
• Magnitude of target star: 11.4
• Magnitude drop [mag]: 4.2
• Estimated maximum duration [s]: 3.1
• Angular distance to moon, phase of moon [deg,%]: 69, 1%
• Goffin's original chart reference: A01_1049

• Approximate width [km]: 80
• Uncertainty [path widths]: +/- 4 (1 sigma)
• Remarks: Uncertainities are given on the basis of the nominal star position errors and the expected asteroid positional accuracy.
• Circles along the path are OCCULT calculated exact centerline points !!!!

• Name: TYC 7923-02126
• Constellation: Corona Australis
• J2000 position [h,m,s; ^o,',"]: 18h 41m 27.606s; -41^o 25' 28.53"
• Position source: UCAC1
• Estimated accuracy ["]: 0.040" (0.031", 0.030")
• V mag [mag]: 11.4
• Remarks:
• The target star is in central Corona Australis. It lies 1.5 degrees south west of mu Corona Australis (magnitude = 5.2).

• Number, name: (1042) Amazone
• Approx. diameter [km]: 76
• Source of used astrometry: US Naval Observatory - Flagstaff Station (Ron Stone)
• Number of used observations: 7
• Number of rejected observations: 0
• Time covered by the observations: 2001 05 09 - 2001 08 23
• Update computed by: Steve Kerr, Rockhampton, Queensland, Australia. (Win Occult 1.4).

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.