This prediction update has been computed by Steve Preston 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:

The updated path lies around 0.4 arcsec north of that given by Edwin Goffin at a time about 0.5 minute earlier. The path now crosses central New Zealand, enters Queensland north of Brisbane, and passes between Townsville and Mt Isa.

THE EVENT AT ONE GLIMPSE:

• Date and approx. UT time of event: 2001 May 03, 12:27 - 12:41 UT
• Approx Time for Wellington: 12:30 UT
• Approx Time for Brisbane: 12:33.5 UT
• Magnitude of target star: 11.8
• Magnitude drop [mag]: 2.9
• Estimated maximum duration [s]: 5.3
• Moon: 80% sunlit, 39^o distance
• Sun: 165^o distance

• Approximate width [km]: 81
• Uncertainty [path widths]: +/- 3.6
• Map: See below

• Name: TYC 4974-0589-1
• Constellation: Virgo
• J2000 position [h,m,s; ^o,',"]: 13 58 49.766s; -05^o 51' 13.26"
• Position source: Tycho-2
• Standard Error: RA, DEC ["]: (0.065", 0.075")
• V mag [mag]: 11.8

• Number, name: (439) Ohio
• Approx. diameter [km]: 76
• Source of used astrometry: US Naval Observatory - Flagstaff Station (Ron Stone)
• Number of used observations: 58
• Number of rejected observations: 7
• Time covered by the observations: 1998 Aug 29 - 2001 Apr 02
• RMS residuals ["] (RA,DEC): 0.100", 0.093"

• Approx. V mag of minor planet at event [mag]: 14.59
• Geocentric parallax of minor planet ["]: 3.85
• Magnitude drop [mag]: 2.9
• Estimated maximum duration [s]: 5.3
• Apparent motion of minor planet ["/h]: 31.19
• Update computed by: Steve Preston