ASTROMETRIC UPDATE:
OCCULTATION BY (934) THURINGIA - 2001 AUGUST 11
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[Prediction by Edwin Goffin]
[Prediction using OCCULT software]
Goffin's path crosses the North Island of New Zealand diagonally from the southwest corner to East Cape. The path given by Occult lies around 2 path widths to the south running along the South Island and covering the Wellington area of the North Island.
UPDATE: 5 August 2001
This prediction update has been computed by Steve Preston of Medina, Washington (state) in the United States based on astrometry from Ron Stone of the US Naval Observatory - Flagstaff Station supplemented with data from the AstDys database. The UCAC position of the target star has been used.
Summary:
This updated path lies around 5 path widths to the north of that given by Edwin Goffin and around 160 seconds later. The path now narrowly misses the southern tip of Tasmania at 10:02:20 UT with Hobart well within the error band. Further east, the path now brushes the very northern tip of the North Island of New Zealand at 10:04 UT. Auckland will lie near the southern extreme of the error tolerance of this calculation.
Additional details of this and other events are available at Steve Preston's website at http://www.oz.net/~stevepr/Asteroids/asteroid.htm
THE EVENT AT ONE GLIMPSE:
- Date and approx. UT time of event: August 11, 2001 @ 10:03 UT
- Magnitude of target star: 10.5
- Magnitude drop [mag]: 5.8
- Estimated maximum duration [s]: 3.2
- Path description: See above.
- Goffin's original chart reference: A01_0837
The Occultation Path:
- Approximate width [km]: 57
- Uncertainty [path widths]: 2.0 (one sigma)
- Map: See below
- Circles along the path are OCCULT calculated exact centerline points !!!!
Data for the target star:
- Name: TYC 6744-01517-1 = PPM 731622
- Constellation: Hydra
- J2000 position [h,m,s; o,',"]: 14h 25m 22.5956s; -29o 35' 05.115"
- Position source: UCAC
- Estimated accuracy ["]: 0.042" (0.030", 0.030")
- V mag [mag]: 10.50
- B-V [mag]: +1.19
- Remarks:
- The target star is in far eastern Hydra. It lies 36' west of 52 Hydrae (magnitude = 5.0)
Data for the minor planet:
- Number, name: (934) Thuringia
- Approx. diameter [km]: 57.1
- Source of used astrometry: US Naval Observatory - Flagstaff Station (Ron Stone), AstDys
- Number of used observations: 262
- Number of rejected observations: 12
- Time covered by the observations: 1920 09 02 - 2001 06 23
- Residuals ["] (RA,DE): 0.034", 0.030" (1 sigma)
Data for the event:
- UT date and time of least geocentric approach: 2001 August 11, 9:59.5 UT
- Approx. V mag of minor planet at event [mag]: 16.25
- Geocentric parallax of minor planet ["]: 2.81
- Magnitude drop [mag]: 5.8
- Estimated maximum duration [s]: 3.2
- Apparent motion of minor planet ["/h]: 28.12
- Angular distance to moon, phase of moon [deg,%]: 160, 59%
- Update computed by: Steve Preston, Medina, Washington, USA. (OrbFit).
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.
Use these links for further information:
[Planetary Occultations]
[Using the Predictions]
[Observing Details]
[Timing Details]
[Reporting Details]
[Report Form]
[Asteroid Occultation Results]
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