ASTROMETRIC UPDATE:
OCCULTATION BY (663) GERLINDE - 2001 DECEMBER 17
UPDATE: 16 DECEMBER 2001
THE UPDATED PATH
This event was identified by Japanese observers and updated from their benefit.
After crossing Irian Jaya and the Arafura Sea, the path crosses Arnhem Land just to the east of Darwin at 10:34 UT. Runing further to the southwest, the path crosses into remote eastern Western Australia where it is lost in twilight.
Calculation Source
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 combined with Tycho 2 proper motion data.
Additional details of this and other events are available at Steve Preston's website at http://www.oz.net/~stevepr/Asteroids/asteroid.htm
EVENT DETAILS SUMMARY:
- Date and approx. UT time of event: 2001 December 17 - 10:34 UT
- Magnitude of target star: 12.2
- Magnitude drop [mag]: 2.7
- Estimated maximum duration [s]: 14.0
- Angular distance to moon, phase of moon [deg,%]: 97, 7%
The Occultation Path:
- Approximate width [km]: 100
- Uncertainty [path widths]: +/- 0.79 (1 sigma)
- Remarks: Uncertainities are given on the basis of the nominal star position errors and the expected asteroid positional accuracy.
Data for the target star:
- Name: TYC 1207-01390-1
- Constellation: Aries
- J2000 position [h,m,s; o,',"]: 1h 57m 28.3838s; + 15o 03' 21.927"
- Position source: UCAC + Tyc 2 Proper Motion
- Estimated accuracy ["]: 0.041" (0.030", 0.030")
- V mag [mag]: 12.2
- Remarks:
- The target star is in southwestern Aries. It lies 2.9 degrees southeast of 4 Arietis (magnitude = 5.9).
Data for the minor planet:
- Number, name: (663) Gerlinde
- Approx. diameter [km]: 100
- Source of used astrometry: US Naval Observatory - Flagstaff Station (Ron Stone), AstDys
- Number of used observations: 381
- Number of rejected observations: 21
- Time covered by the observations: 1908 06 24 - 2001 12 07
- 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.
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