![\"CBET](\"https:\/\/bcmeteors.net\/wp\/wp-content\/uploads\/2010\/08\/cbet1501.jpg\" "\\"CBET")
<\/p>\nAs the sun was about to rise on September 9, 2008 an unpredicted outbreak of the September Perseid shower occurred.<\/p>\n
Jeff, at the West Kelowna site, checked his overnight Sentinel video captures and quickly noted an unusual cluster of fireballs. Below is a composite image of of the outbreak.<\/p>\n<\/p>\n
Brower notified Dr. Peter Jenniskens of the large number of fireballs via e-mail. Jenniskens then sent inquiries to other observers to confirm the outbreak. Almost simultaneously reports of the outbreak started coming in on various meteor forums . As soon as Jenniskens received supporting information he issued a telegram, CBET 1501, as shown below.<\/p>\n
<\/p>\n
\u00a0<\/p>\n
<\/p>\n
\u00a0<\/p>\n
Jeff then contacted members of the British Columbia video meteor network to see if they captured the outbreak. Ed Majden in<\/p>\n
Courtney, Ken Tapping in Penticton, and Ajai Sehgal, in Osoyoos reported they did have images of the outbreak.<\/p>\n
While waiting for reports from the network observers Brower sent an e-mail to noted Finnish meteor researcher, Esko Lyytinen reporting the outbreak<\/p>\n
and inquiring if any of the Finnish video network stations caught the outbreak. The Finnish video network was weathered out on September 9 but two stations (Timo Kantola and Esko Lyytinen) did catch a fireball from the shower radiant on 2008-09-07 at 23:10:05 UT.<\/p>\n
Esko also report he had a peak for the outbreak period in his radio data as did David Entwistle in the U.K.\u00a0 and Brower.<\/p>\n
Esko asked Jeff to send some a composite image (jpg) from the outbreak. By using a graphics program Esko was able to push the contrast and the brightness of Brower’s still shot. Brower then use the same technique on his other fireball images. Using this enhancement method, Esko was able to bring out a dozen different stars, enough for him to calibrate Brower’s camera system. We then tried the same technique on Ken’s, Ed’s and Ajai’s images. When examined closely only Ken Tapping’s images were usable for a two station solution. Unfortunately, he other observers cameras were either out of focus or underexposed so no background stars could be pulled out of the noise.<\/p>\n
With Tapping’s and Brower’s data Lyytinen began a concentrated effort for a two station triangulation solution and orbit determination for the outbreak.<\/p>\n
Since the outbreak was unpredicted we had two major questions. The first question was does the radiant of the outbreak members coincide with the September Perseid Shower’s radiant.\u00a0 The second question was the parent or source of the outbreak from a long period comet or a Halley type orbit (short period). The very short duration of the outburst is characteristic of a long period comet so the calculation of the period of the outbreak members would be critical in answering this question.<\/p>\n
Lyytinen did all the calculations for us and we are very grateful for the long hours he put in on our behalf.<\/p>\n
Esko first produced a back ray tracing using UFO Analyzer. The back tracing showed a tightly cluster point for the apparent radiant at Ra 47.1 and declination of +39.7 (see image below).<\/p>\n
![](\"https:\/\/bcmeteors.net\/wp\/wp-content\/uploads\/2010\/08\/spe_20080909_radiant.gif\")
<\/p>\n
Lyytinen then began work on three fireballs mutually recorded by Ken and Jeff. Upon critical inspection Esko was forced to reject on of them due to the shortening of the image by the fish eye lens low to the horizon. The trail of the third meteor was too short to employ his method of analysis.<\/p>\n
Lyytinen ran several iterations on the two fireballs and calculated orbital parameters for each. He also analyzed the Finnish fireball from the night before but noted he only considered the semi-major axis or orbital period in the averaging with the two from British Columbia. He also noted there might be “…some selection effect on the weighting of individual frame positions by the already known radiant.”<\/p>\n
By using both use of the trail-image and the two station radiant data he was able to find nominal orbit parameters for the outburst. Esko’s best fit produced a geocentric radiant Ra 47.4 and declination of + 39.5 ( J2000.0). For a complete summary of his nominal orbit analysis see the image below.<\/p>\n
![](\"https:\/\/bcmeteors.net\/wp\/wp-content\/uploads\/2010\/08\/orbit_nominal_small.gif\")
<\/p>\n
\u00a0<\/p>\n
Esko reported “I got the average of the inverses of semi-major axis (1\/z) as 0.05454 ( 1\/AU ). This corresponds a=18.34 (corresponding orbital period=78.5 y) . The standard error of the average of 1\/z is 0.021 (even though from small number statistics). <\/p>\n
The semi-major-axis and orbital, periods that correspond the 1\/z values by one std.err at both sides are \u00a013.24 AU and 48 years and 29.8 Au and 163 years.
So, the real uncertainty to the longer period side is practically to the parabolic orbit.”<\/p>\n
\u00a0<\/p>\n
<\/p>\n
\u00a0<\/p>\n
We had to research questions, does the radiant of the outbreak members coincide with the September Perseid Shower’s radiant and is the orbit that of a long period comet or is it a short period comet.<\/p>\n
Here is a comparison between the data from the IMO shower list, Molau’s Shower 68 and those derived form the BC videos.<\/p>\n
IMO\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 BC\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Shower 68<\/p>\n
\u03bbsol\u00a0\u00a0\u00a0 166\u00b07\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 166.9089\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 n\/a<\/p>\n
\u03b1\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 60\u00b0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 47.7\u00b0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 48.0\u00b0<\/p>\n
\u03b4\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 47\u00b0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 +39.5\u00b0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 39.5\u00b0<\/p>\n
Vinf<\/sub> 64 km\/s \u00a0 \u00a0 \u00a0 \u00a0\u00a0 65.47 km\/s\u00a0\u00a0\u00a0\u00a0 65 km\/s<\/p>\n ZHR\u00a0\u00a0\u00a0\u00a0\u00a0 5\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u02dc25\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 n\/a<\/p>\n The best fit is with Sirko Molau’s (Molau 2008) Shower 68 and not the SPE.\u00a0 Much more research is needed before we can declare this is true or just a coincidence. This should be an open question.<\/p>\n As Esko calculations show the source for this outbreak is in a Jupiter crossing orbit with a mean period of 78.54 years. This puts it into a Halley type orbit (short period).<\/p>\n More to come…<\/p>\n Orbital parameters <\/strong>(equinox J2000) Period: 78.54 years Heliocentric Radiant<\/strong> \u03b1 Geo<\/sub> 47.40 Geocentric Radiant Position<\/strong> Refs cited and develop Shower 68 discussion edited: 2010-09-24 by jlb<\/p>\n","protected":false},"excerpt":{"rendered":" As the sun was about to rise on September 9, 2008 an unpredicted outbreak of the September Perseid shower occurred. Jeff, at the West Kelowna site, checked his overnight Sentinel video captures and quickly noted an unusual cluster of fireballs. Below is a composite image of of the outbreak. Brower notified Dr. Peter Jenniskens of … Continue reading “2008 09 09 The SPE Outbreak”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":237,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[41],"tags":[],"class_list":["post-241","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-video-results"],"_links":{"self":[{"href":"https:\/\/bcmeteors.net\/index.php?rest_route=\/wp\/v2\/posts\/241","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/bcmeteors.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/bcmeteors.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/bcmeteors.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/bcmeteors.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=241"}],"version-history":[{"count":0,"href":"https:\/\/bcmeteors.net\/index.php?rest_route=\/wp\/v2\/posts\/241\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/bcmeteors.net\/index.php?rest_route=\/wp\/v2\/media\/237"}],"wp:attachment":[{"href":"https:\/\/bcmeteors.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=241"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/bcmeteors.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=241"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/bcmeteors.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=241"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
year: 2008
month: 9
day: 9.347222
q(AU): 0.719
a (AU): 18.34
e: 0.961
i (deg): 139.08
omega: 245.36
node: 166.909
pi: 52.27
Vinf<\/sub>: 65.47 km\/s
Vgeo<\/sub>: 64.32 km\/s
Vh<\/sub>: 41.39 km\/s<\/p>\n
Q (AU): 35.96
1\/a: 0.055
Solar Long: 166.9089<\/p>\n
\u00df\u00a0\u00a0 33.77
\u03bb\u00a0\u00a0 37.38
Vh<\/sub> 41.39 km\/s<\/p>\n
\u03b4 Geo<\/sub> +39.50
Days to perihelion: 36.7
Orbit: ecliptic retrograde
Meets in: descending node
Ratio of revolution to Jupiter: 0.15:1
Jupiter crossing: Yes
Observed Radiant Position<\/strong>
Local sidereal time -6.245 deg or an hour angle of 306.49
Data for equinox date: Ra: 42.27 Dec: +39.57
Data equinox J2000: RA 47.28 Dec: +39.53
Vinf: 65.47 km\/s<\/p>\n
Local sidereal time: -6.245 deg or an hour angle of 306.37
Data for equinox date: Ra: 47.38 Dec: +39.53
Data equinox J2000: RA: 47.40 Dec: +39.50
Vgeo<\/sub>:\u00a0 64.32 km\/s<\/p>\n