ASTROMETRIC UPDATE:
OCCULTATION BY (580) SELENE - 2001 MAY 15
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[Prediction by Edwin Goffin]
[Prediction using OCCULT software]
The path given by Edwin Goffin runs from the Rockhampton area on the central Queensland coast west to the Western Australian coast in the Karratha/Port Hedland area. The Occult prediction lies around 5 path widths to the north running from the Bowen/Ayr region on the Queensland coast to Derby on the Western Australian coast.
UPDATE: 12 May 2001
This prediction update has been computed by Steve Preston of the Medina, Washington (state) in the United States 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:
This updated path is almost indistinguishable from that given by Edwin Goffin and only 15 seconds later. The path runs from Gladstone on the Queensland coast (15:42 UT) west to the Western Australian coastline at Port Hedland (15:47:15 UT). The path passes just to the north of Alice Springs (15:45 UT)
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: May 15, 2001 @ 15:45 UT
- Magnitude of target star: 9.35
- Magnitude drop [mag]: 5.6
- Estimated maximum duration [s]: 5.2
- Path description: See above.
- Goffin's original chart reference: A01_0527
The Occultation Path:
- Approximate width [km]: 55
- Uncertainty [path widths]: 2.4 (1 sigma error band)
- 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: HIP 85908 = PPM 266997 = SAO 185500
- Constellation: Ophiuchus
- J2000 position [h,m,s; o,',"]: 17h 33m 20.572s; -21o 18' 16.73"
- Position source: Tycho-2
- Estimated accuracy ["]: 0.022" (0.014", 0.017")
- V mag [mag]: 9.35
- B-V [mag]: +0.503
- Remarks:
- The target star is in southeastern Ophiuchus. It lies only 52' northwest of the star 52 Ophiuchi (magnitude = 6.5).
Data for the minor planet:
- Number, name: (580) Selene
- Approx. diameter [km]: 54.7
- Source of used astrometry: US Naval Observatory - Flagstaff Station (Ron Stone)
- Number of used observations: 43
- Number of rejected observations: 6
- Time covered by the observations: 1998 11 14 - 2001 05 06
- Uncertainy Ellipse ["] (major axis, minor axis, PA): 0.101", 0.031", 95°.
Data for the event:
- UT date and time of least geocentric approach: 2001 May 15, 15:41.1 UT
- Approx. V mag of minor planet at event [mag]: 14.94
- Geocentric parallax of minor planet ["]: 3.42
- Magnitude drop [mag]: 5.6
- Estimated maximum duration [s]: 5.2
- Apparent motion of minor planet ["/h]: 20.19
- Angular distance to moon, phase of moon [deg,%]: 64, 48%
- 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:
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