ASTROMETRIC UPDATE:
OCCULTATION BY (859) BOUZAREAH - 2001 SEPTEMBER 24
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[Prediction by Edwin Goffin]
[Prediction using OCCULT software]
Goffin's path runs centrally across the North Island of New Zealand from Taranki to East Cape. The path given by Occult lies slightly to the north across the Hamilton area.
UPDATE: 20 September 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 and Gordon Garradd, Loomberah, New South Wales supplemented with data from the AstDys database. The UCAC position of the target star has been used.
Summary:
This updated path lies around three path widths to the northwest and around 10 seconds earlier than that given by Goffin. The path now crosses the North Island covering the area between Auckland and Whangarei at 7:50:40 UT. The error band on the this calculation is such that observers as far away as Palmerston North stand a reasonable chance of observing an occultation.
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: September 24 : 7:51 UT
- Magnitude of target star: 10.19
- Magnitude drop [mag]: 5.6
- Estimated maximum duration [s]: 4.3
- Path description: See above.
- Goffin's original chart reference: A01_0953
The Occultation Path:
- Approximate width [km]: 75
- Uncertainty [path widths]: +/- 1.44 (1 sigma)
- Map: See below
Data for the target star:
- Name: TYC 7389-01361-1 = PPM 296695 = SAO 209156
- Constellation: Scorpius
- J2000 position [h,m,s; o,',"]: 17h 42m 16.6035s; -36o 12' 40.336"
- Position source: UCAC
- Estimated accuracy ["]: 0.040" (0.030", 0.030")
- V mag [mag]: 10.19
- B-V [mag]: +1.31
- Remarks:
- The target star is in eastern Scorpius. It lies around half way between the bright naked eye open cluster Messier 7 and Shaula - lambda Scorpii (magnitude = 1.6).
Data for the minor planet:
- Number, name: (859) Bouzareah
- Approx. diameter [km]: 77
- Source of used astrometry: US Naval Observatory - Flagstaff Station (Ron Stone), Gordon Garradd, AstDys
- Number of used observations: 208
- Number of rejected observations: 34
- Time covered by the observations: 1916 09 21 - 2001 09 15
Data for the event:
- UT date and time of least geocentric approach: 2001 September 24, 7:48.4 UT
- Approx. V mag of minor planet at event [mag]: 15.77
- Geocentric parallax of minor planet ["]: 2.64
- Magnitude drop [mag]: 5.6
- Estimated maximum duration [s]: 4.3
- Apparent motion of minor planet ["/h]: 26.74
- Angular distance to moon, phase of moon [deg,%]: 14, 49%
- 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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