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IMO Shower Circ.: Leonids 2003 update

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  • RainerArlt
    ... I M O S h o w e r C i r c u l a r ... LEONIDS 2003, VISUAL, 2nd Circular An updated profile of the Leonid meteor activity was computed. The data
    Message 1 of 1 , Nov 25 12:35 AM
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      I M O S h o w e r C i r c u l a r
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      LEONIDS 2003, VISUAL, 2nd Circular

      An updated profile of the Leonid meteor activity was computed.
      The data collected are still producing a noisy picture. An
      enhancement of activity is found on November 13, between
      12h UT and 24h UT. This coincides with the predicted encounter
      time with the 1499 dust trail of Comet 55P/Tempel-Tuttle.

      The clearest feature of the profile is the activity maximum
      on November 19, between 0h UT and 22h UT. No sharp peak time
      is found. Predictions were given for the 1533 dust trail encoun-
      ter between 6h30 and 8h UT. The predictions mentioned are
      based on caluclations by Asher, Lyytinen, Nissinen, McNaught,
      and Vaubaillon.

      Lyytinen obtained additionally an encounter with the 1733 trail
      for November 19, 16h50 UT. The long duration of the observed
      November 19 peak maybe attributed to the superposition of the
      two encounters. Data are not sufficient though to derive
      more precise peak times.

      ------------------------------------------------------
      Date (UT) Time Solarlong nINT nLEO ZHR
      ------------------------------------------------------
      Nov 13.05 01:12 230.184 3 9 14 +- 4
      Nov 13.50 12:00 230.637 4 13 27 +- 7
      Nov 13.67 16:05 230.808 12 15 13 +- 3
      Nov 13.73 17:31 230.868 17 59 21 +- 3
      Nov 13.78 18:43 230.918 12 50 19 +- 3
      Nov 14.01 00:14 231.150 7 9 22 +- 7
      Nov 14.77 18:29 231.915 1 2 (41) +- 24
      Nov 15.71 17:02 232.861 6 8 15 +- 5
      Nov 15.80 19:12 232.952 7 20 16 +- 3
      Nov 16.67 16:05 233.828 16 38 14 +- 2
      Nov 17.37 08:53 234.534 8 16 13 +- 3
      Nov 17.72 17:17 234.887 17 65 18 +- 2
      Nov 18.44 10:34 235.613 13 42 15 +- 2
      Nov 19.03 00:43 236.208 14 91 40 +- 4
      Nov 19.11 02:38 236.289 13 111 41 +- 4
      Nov 19.17 04:05 236.349 14 96 32 +- 3
      Nov 19.26 06:14 236.440 6 16 39 +- 9
      Nov 19.34 08:10 236.521 13 69 27 +- 3
      Nov 19.42 10:05 236.601 12 117 35 +- 3
      Nov 19.63 15:07 236.813 23 292 63 +- 4
      Nov 19.91 21:50 237.096 19 51 43 +- 6
      Nov 20.20 04:48 237.389 18 171 32 +- 2
      Nov 20.92 22:05 239.126 8 21 14 +- 3
      Nov 21.66 15:50 238.863 11 40 7 +- 1
      Nov 22.18 04:19 239.388 7 17 10 +- 2
      Nov 22.91 21:50 240.126 8 26 11 +- 2
      Nov 23.15 03:36 240.369 7 28 6 +- 1
      ------------------------------------------------------

      A population index of r=2.3 was used to extrapolate to lm=+6.5.
      All solar longitudes refer to equinox J2000.0. nINT is the
      number of observing periods, nLEO the number of Leonid meteors.

      Many of the observations suffer from low limiting magnitudes,
      and the value of the limiting magnitude may be systematically
      over- or underestimated. We derived the median of the sporadic
      hourly rates of all the observing periods and obtain <HR> = 16
      which is typical for November. Observers reporting at least
      10 sporadics meteors are corrected according to the ratio of
      their average sporadic rate to 16.

      Rainer Arlt, 2003 November 25, 8h30 UT
      --
      Rainer Arlt -- Astrophysikalisches Institut Potsdam -- www.aip.de
      Visual Commission - International Meteor Organization -- www.imo.net
      rarlt@... -- phone: +49-331-7499-354 -- fax: +49-331-7499-526




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