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(meteorobs) Ursid shower outburst confirmed
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To: meteorobs@jovian.com
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Subject: (meteorobs) Ursid shower outburst confirmed
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From: Peter Jenniskens <pjenniskens@mail.arc.nasadot gov>
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Date: Fri, 22 Dec 2000 10:39:57 -0800
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Cc: marco.langbroek@wanadoodot nl, imo-news@egroups.com, Esko.Lyytinen@MINEDU.FI, kburton@mail.arc.nasadot gov, dmorrison@mail.arc.nasadot gov, brian@cfaps1.harvarddot edu, phillips@spacescience.com, sshostak@seti.org, mfonda@mail.arc.nasadot gov, dblake@mail.arc.nasadot gov, dedalus@dev.latrade.com, cjohannink@netsidedot de, rhawkes@mailserv.mtadot ca, gustaf@astro.ufldot edu, GChui@sjmercury.com, daveh@lanminds.com, chriscrawford@wavedot net, kbeatty@skypub.com, kronkg@medicine.wustldot edu, Houston1@ixdot netcom.com, dsummers@mail.arc.nasadot gov, oh5iy@kotilo.saunalahti.fi, watanabe@pub.mtk.nao.ac.jp, zj@bac.pkudot edu.cn, gyssens@charlie.luc.acdot be, betlem@strw.LeidenUnivdot nl, bafb4@central.sussex.acdot uk, tpcoope@mweb.co.za, klar@plug-in.com.br, astropor@savba.savba.sk, president@imodot net, richardson@digitalexp.com, LMJ53851@biglobe.ne.jp, lbellot@ll.iac.es, LUNRO.IMO.USA@prodigy.com, peter@max.arc.nasadot gov
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Early Ursid results
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The Ursid shower did flare up significantly last night between 5 UT and
9:30 UT,
with a peak around 7:20±10 UT, close to the predicted maximum at 7:29 UT.
Attached are foreward scatter observations by Esko Lyytinen, showing the
increase of rates much as predicted in our paper (P. Jenniskens & E. Lyytinen,
"Possible Ursid outburst on Dec. 22, 2000", WGN, the Journal of the IMO
(2000)).
US observers were best located for the event, although European observer
Marco Langbroek of the Netherlands reports observing the onset of the shower
at 5-6:15 UT, at which time the ZHR was about 20.
The shower was observed by us from California, using video imaging and
spectroscopy techniques. Present were Peter Jenniskens, Ming Li and Duncan
McNeill at a site near Parkfield, and Pete Gural, Mike Koop, Mike Wilson, and
Chris Angelos at the San Antonio Lake campground near King City.
Local weather allowed observations between about
5:40 and 11:00 UT. Results await data analysis, however several relatively
bright Ursids were seen (magnitude +1 to -1), some of which may have
been recorded by the low-resolution spectrograph. A zero magnitude Ursid
left a half-second duration wake. Six intensified cameras at each site
recorded the variation of flux and Ursid light curves. Some very minimal
visual observations between operations of equipment are reported below
and suggest a ZHR of about 50 half an hour after the peak, comparable
to the Perseid shower in summer.
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Obs: Peter Jenniskens
Loc.: Parkfield, California (about 120.0 Deg. W, +35.9 deg. N)
Date: December 21-22, 2000
UTC Teff Lm Urs Spo ZHR(Urs)
08:07-08:19 0.20 6.2 4 3 50±25
08:31-08:52 0.35 6.2 4 2 27±14
09:13-09:32 0.32 6.2 2 3 14±10
10:14-10:55 0.69 6.2 6 12 17±7
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Obs: Peter Gural
Loc.: King City, California (about 121.0 Deg. W, +35.8 deg. N)
Date: December 21-22, 2000
UTC Teff Lm Urs Spo ZHR(Urs)
08:01-08:10 0.15 6.2 10 2 200±65
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We plan to present an update at the Leonid MAC website after a good
day's sleep and more information has been received
(http://leonid.arc.nasadot gov).
Peter Jenniskens
SETI Institute
NASA Ames Research Center
pjenniskens@mail.arc.nasadot gov
Urs_time.jpg
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