(6) Hebe final prediction
Last updated on 1995 Dec 16
- (6) Hebe will occult PPM 210815 on 1995/12/18 at 07:34:38.4 UTC
(geocentric)
- Prediction details. (21Kb). The event
will be visible in Northern California through to central Idaho. The
asteroid should be at about V=9.0 and the star is 8.5 so the flux drop
should be about 50%. For an assumed radius of 96 km, a central chord
would last 18.8 seconds. The predictions are based on transit
telescope measurements made at the US Naval Observatory Station here in
Flagstaff. So far we have 11 measurements of the star and 11
measurements of the asteroid. The correction to the ephemeris is
present uncertain by 0.079 arcsec in right ascension and 0.086 arcsec
in declination. We have generated postscript plots of the entire track (305Kb) and a plot of the southwest US (207Kb). The dashed lines are
contours of constant target elevation at the time of the event (labeled
from 10 to 25 degrees). At the northeastern limit the asteroid is too
low to the horizon to observe. The catalog coordinates of the star are
ra=01:54:54.043, dec=-11:30:40.74, J2000. This is the final prediction
for the event. Given the weather conditions, a portable expedition
will not be sent out from Lowell Observatory. Ted Dunham will try the
event (weather permitting) from near the southern limit and the Crossley
Telescope on Mt. Hamilton may be trying the event as well.
The prediction team consists of Ron Stone at the US Naval Observatory
providing transit measurements, Larry Wasserman at Lowell Observatory is
processing the measurements and generating the predictions and plots, and
Marc Buie, also Lowell Obs., is coordinating the collection and dissemination
of information (like this WWW page). Direct comments and questions to
Marc Buie.