> -------------------------------------
> I M O S h o w e r C i r c u l a r
> -------------------------------------
>
> LEONIDS 2003, VISUAL
>
>
> The 2003 Leonid meteor shower has not yet provided distinct
> peaks of activity. A full week of moderate Leonid meteor
> rates has shown only one clear maximum; near 2003 Nov 19.4 UT
> with an uncertainty of roughly +-6 hours.
>
> This maximum coincides with the predicted times of about
> 06h30 - 08h00 UT for the encounter with the 15-revolution
> dust trail of parent comet 55P/Tempel-Tuttle. The dust
> was ejected from the comet near its perihelion passagein
> 1533.
>
> The material ejected in 1499 has produced enhanced rates
> on November 13, but no clear peak time can be derived from
> the data received so far.
>
> The ZHR gives the number of meteors as if the radiant would
> be in the zenith, and at an observer´s stellar limiting
> magnitude of +6.5. The latter condition implies strong
> extrapolations of observed meteor numbers, since the waning
> moon interfered with most of the observing periods.
>
> At this preliminary state, only the relative variations in
> the ZHR should be of interest. Absolute values must be
> discussed and fixed with the full dataset.
>
> --------------------------------------
> Date Solarlong nINT nLEO ZHR
> --------------------------------------
> Nov 12.80 229.93 1 0 (0)
> Nov 13.50 230.64 4 13 26
> Nov 13.72 230.86 7 12 21
> Nov 14.01 231.15 7 9 27
> Nov 14.77 231.92 1 2 (47)
> Nov 15.76 232.91 13 28 15
> Nov 16.24 233.40 1 4 (20)
> Nov 17.21 234.37 4 7 7
> Nov 18.52 235.69 6 18 13
> Nov 19.06 236.24 9 63 23
> Nov 19.14 236.32 10 51 39
> Nov 19.37 236.55 14 88 53
> Nov 19.90 237.09 14 35 39
> --------------------------------------
>
> 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.
>
> We would like to thank the following observers for their
> contributions to the above ZHR table:
>
> Alexandre Amorim, Joseph Assmus, Jure Atanackov, Aleksandar Atevik,
> Shushrut Bhanushali, Michael Boschat, Dustin Brown, Ed Cannon,
> Parag Deotare, Kshitija Deshpande, Lucio Furlanetto, Kearn Jones,
> Paul Jones, Javor Kac, Ashish Kuvelkar, Anna Levina, Michael Linnolt,
> Qiang Ma, Xiaoyun Ma, Paul Martsching, Mikhail Maslov, Alastair
> McBeath, Norman McLeod, Huan Meng, Yatin Patnekar, Nilesh Puntambekar,
> Tushar Purohit, Jurgen Rendtel, Rahul Sangole, Mikiya Sato, Tomoko
> Sato, Vladimir Slusarenko, Wesley Stone, Kazumi Terakubo, Richard
> Taibi, Michel Vandeputte, Jeremie Vaubaillon, Linjia Wang, Yi Wang,
> Guangjie Wu, Quanzhi Ye, Chao Zhang, Menglin Zhang, Zhousheng Zhang.
>
>
> Rainer Arlt, 2003 Nov 20, 09h UT |