This prediction update has been computed by Dr Martin Federspiel of the Freiburg Planetarium in Germany based on astrometry from Ron Stone of the US Naval Observatory - Flagstaff Station, The Tycho-2 position of the target star has been used.

Summary:

This updated path lies around 2 path widths south of that given by Edwin Goffin at a time about 0.4 mins later. The path now just touches the south of the South Island, crosses Tasmania in the vicinity of Launceston, skims southernwestern Victora and crosses Western Australia in the vicinity of Exmouth.

THE EVENT AT ONE GLIMPSE:

• Date and approx. UT time of event: April 8, 2001 @ 14:19.5 - 14:27 UT
• Magnitude of target star: 9.6
• Magnitude drop [mag]: 3.7
• Estimated maximum duration [s]: 11
• Path description: See above.
• Goffin's original chart reference: A01_0418

• Approximate width [km]: 160
• Uncertainty [path widths]: 1.2 (0.10")
• Map: See below
• Remarks: Uncertainities are given on the basis of the nominal star position errors and the expected asteroid positional accuracy.

• Name: TYC 5529-00181-1
• Constellation: Virgo
• J2000 position [h,m,s; ^o,',"]: 12h 17m 50.500s; -10^o 04' 23.99"
• Position source: Tycho - 2
• V mag [mag]: 9.6

• Number, name: (420) Bertholda
• Approx. diameter [km]: 150
• Source of used astrometry: US Naval Observatory - Flagstaff Station (Ron Stone)

• UT date and time of least geocentric approach: 2001 April 8, 14:25.1 UT
• Approx. V mag of minor planet at event [mag]: 13.2
• Geocentric parallax of minor planet ["]: 1.25
• Magnitude drop [mag]: 3.7
• Estimated maximum duration [s]: 11.0
• Apparent motion of minor planet ["/h]: 27.27
• Update computed by: Dr. Martin Federspiel - Freiburg, Germany.