RASNZ Occultation Section - Palisana Occultation Update

ASTROMETRIC UPDATE:
OCCULTATION BY (914) PALISANA - 2000 JULY 1

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[Prediction by Edwin Goffin]

[Prediction using OCCULT software]

[Detailed finder chart by Jan Manek]

Goffin's path crosses eastern Western Australia running from east of Esperence to the Joseph Bonaparte Gulf west of Darwin. The path then clips the western extremeties of Irian Jaya before running north to cross western Japan. The path given by OCCULT lies around 2 path widths to the east and around 1 minute earlier. It crosses the southern Western Australian coast near Eyre running to the north passing just to the east of Darwin in the Northern Territory.

UPDATE: 29 June 2000

This prediction update has been computed by Jan Manek of the Stefanik Observatory based on astrometry from Ron Stone of the US Naval Observatory - Flagstaff Station and Bill Owen of the Table Mountain Observatory (TMO). The Tycho-2 position of the target star has been used.

Summary:

This update gives a path around 1.5 path widths to the east and around 0.8 of a minute earlier than that given by Goffin. The path now crosses the southern Western Australian coastline around 200 km east of Esperence (18:00:40 UT) running to the north-east across the Great Victoria Desert. The path crosses the Northern Territory coastline with Darwin on its eastern edge (18:02:15 UT). The path continues on the western Irian Jaya (18:03 UT) and western Japan with Nagoya on its western edge (18:07:30 UT).

THE EVENT AT ONE GLIMPSE:

Date and approx. UT time of event: July 1, 2000 @ 18:01 UT (for Australia)
Magnitude of target star: 9.8
Magnitude drop [mag]: 2.5
Estimated maximum duration [s]: 5.0
Path description: See above.
Goffin's original chart reference: A00_0739

The Occultation Path:

Approximate width [km]: 80
Uncertainty [path widths]: 1.7
Uncertainty in time [s]: 10
Map: See below
Remarks: Uncertainities are given on the basis of the nominal star position errors and the expected asteroid positional accuracy.
Circles along the path are OCCULT calculated exact centerline points.

Data for the target star:

Name: TYC 2223-01379-1 = PPM 114490

Constellation: Pegasus

J2000 position [h,m,s; ^o,',"]: 22h 29m 23.490s; +25^o 49' 05.84"

Position source: Tycho 2

Estimated accuracy ["]: 0.04" (0.03", 0.03")

Johnson V mag [mag]: 9.77

B-V (mag) = +0.66

Remarks:

The target star is in central Pegasus. The target star lies just under 8 degrees west south-west of beta Pegasi (Scheat - mag = 2.5 - the north-west corner star of the 'Great Square of Pegasus'). The target star also lies around 4.8 degrees west of the mag = 3.5 star mu Pegasi. There is a mag = 5.8 star (SAO 90544) 57' to the north of the target star and a mag = 8.4 star (SAO 90553) 11' north-east of the target star.
To see detailed finder charts, click here.

Data for the minor planet:

Number, name: (914) Palisana
Approx. diameter [km]: 79
Source of used astrometry: US Naval Observatory - Flagstaff Station (Ron Stone), TMO (Bill Owen)
Number of used observations: 31 USNO, 2 TMO
Number of rejected observations: 6 USNO
Time covered by the observations: 1998 02 02 - 2000 05 09
RMS residuals ["] (RA,DE): 0.11", 0.10"
Estimated positional accuracy at epoch of event ["]: 0.10"
Only 2 TMO positions from May 9, 2000 available from this years apparition.

Data for the event:

UT date and time of least geocentric approach: 2000 July 1, 18:06.5 UT
Approx. V mag of minor planet at event [mag]: 12.2
Geocentric parallax of minor planet ["]: 6.295
Magnitude drop [mag]: 2.5
Estimated maximum duration [s]: 5.0
Apparent motion of minor planet ["/h]: 56.68
Angular distance to moon, phase of moon [deg,%]: 107, 0%
Update computed by: Jan Manek, Stefanik Observatory, Prague, Czech Republic.

Palisana Update

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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