Electronic Telegram No. 5452
Central Bureau for Astronomical Telegrams
Mailing address:  Hoffman Lab 209; Harvard University;
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Prepared using the Tamkin Foundation Computer Network


NEW METEOR SHOWER M2024-S1 IN URSA MINOR
     D. Vida, University of Western Ontario; and D. Segon, Croatian Meteor
Network, report an outburst of meteors with a radiant in Ursa Minor.  Thirty-
one meteors were observed by the Global Meteor Network low-light video
cameras on 2024 Sept. 23-25 (cf. URL https://globalmeteornetwork.org/data/).
The shower was independently observed by cameras in ten countries worldwide.
The meteors were bright, most having peak magnitudes brighter than +0.0.  The
shower had a median geocentric radiant with coordinates R.A. = 238.27 deg,
Decl. = +77.26 deg, within a circle with a standard deviation of +/- 1.2 deg
(equinox J2000.0).  The median sun-centered ecliptic coordinates were L-L0 =
296.63 deg, beta = +75.72 deg.  The geocentric velocity was 32.0 +/- 1.2 km/s.
The orbital elements are those of a Jupiter-family comet (Tisserand parameter
2.34 +/- 0.16):  q = 0.994 +/- 0.003 AU, e = 0.68 +/- 0.03, i = 53.9 +/- 2.4
deg, Peri. = 169 +/- 2 deg, Node = 181.8 +/- 0.4 deg (equinox J2000.0).  All
meteors appeared during the solar-longitude interval 181.0-183.0 degrees, with
a peak at 181.9 deg.  The parent body search suggests a possible parent body
to be 2021 HK_12 (Southworth-Hawkins D criterion of 0.15) with orbital
parameters q = 1.036 AU, e = 0.685, i = 47 deg, Peri. = 168.8 deg, Node =
187.1 deg.  This shower is similar to, but distinct from, the epsilon Ursae
Minorid meteors (IAU shower no. 1044, abbreviation code EPU), whose radiants
in 2020 and 2022 have been observed 5 degrees away from that of this new
shower M2024-S1, with similar geocentric velocities of about 33 km/s.
Furthermore, the EPU shower was reported with orbital elements q = 1.003 AU,
e = 0.604, i = 57.2 deg, Peri. = 178.0 deg, Node = 182.0 deg -- significantly
outside of the measurement errors of the new shower M2024-S1.  However, due to
the similar activity period and a close radiant location, Vida et al. do not
exclude the possibility of the two showers being dynamically related.  The new
shower received the working designation M2024-S1 from the IAU Meteor Data
Center.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2024 CBAT
2024 October 1                   (CBET 5452)              Daniel W. E. Green