SETI [ASTRO] June Bootids (fwd)


Larry Klaes (lklaes@bbn.com)
Thu, 24 Jun 1999 12:59:48 -0400


>X-Authentication-Warning: brickbat12.mindspring.com: majordom set sender to owner-astro using -f >Date: Wed, 23 Jun 1999 19:35:57 -0300 (ADT) >From: Michael Boschat <andromed@ATM.DAL.CA> >To: ASTRO <astro@lists.mindspring.com> >Subject: [ASTRO] June Bootids (fwd) >Sender: owner-astro@brickbat12.mindspring.com >Reply-To: Michael Boschat <andromed@ATM.DAL.CA> > >From: Robert Lunsford <lunro.imo.usa@prodigy.com> >To: Meteor Observing Mailing List <meteorobs@jovian.com> > >After being dormant for more than half a century the June Bootid meteor >shower came to life last year on the evenings of June 27 and 28. Strong >rates persisted for more than 24 hours allowing everyone with clear >skies a chance to view some of the activity. This encounter was not the >result of the close approach of the parent comet Pons-Winnecke, rather >it seems that the Earth encountered particles in an old orbit of Pons- >Winnecke that may have recently been perturbed back into a position to >encounter the Earth. This does not guarantee that a repeat performance >will occur every year, but chances are that some activity from the June >Bootid meteor shower may be seen. > >Unfortunately this year June 27 and 28 coincide with the full moon >therefore the fainter shower members will be all but lost in the glare >of the intense moonlight. There may be a chance that some of the >brighter members can be seen in areas of the sky away from the >moonlight. The best activity is anticipated to occur on Sunday evening >June 27 and continue into Monday. To observe this shower start watching >as soon as darkness falls on Sunday evening. It would be advisable to >face toward the north or west to keep the moonlight out of ones direct >line of sight. The radiant lies in northern Bootes at the position of >15:20 +47. This position is nearly overhead for the temperate latitudes >of the Northern Hemisphere. The June Bootids are among the slowest of >shower meteors with an entry velocity of only 18 km/sec. They will >appear much slower than the average meteor, often covering less than 5 >degrees per second of motion. > >We would request that observers who wish to monitor this shower to >record the number of June Bootids seen verses the number of sporadic >(random) meteors seen during a specified amount of time, usually in >periods of one hour. It is important that each person keeps their own >tally as group rates are worthless. It is also important to estimate the >limiting magnitude of your sky (the faintest star visible), to note any >cloud cover or obstructions (listed as a percent of your field of view), >and to note any breaks taken during your watch. These parameters are >important so that all observers data can be corrected to a common factor >and that all data may be directly compared. Other interesting data that >may be recorded is the color of each meteor, its magnitude, and whether >it produced a persistent train (uncommon with slow meteors). > >May your skies be clear and be sure to let us know what you see! > >Bob Lunsford > > >



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