Electronic Telegram No. 5559
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 IN OCTANS
     D. Vida, University of Western Ontario, Canada; and D. Segon, Croatian
Meteor Network, report an outburst of meteors with a radiant in Octans:
Nineteen meteors were observed by the Global Meteor Network low-light video
cameras during 2025 May 22-24 (cf. URL https://globalmeteornetwork.org/data/).
The shower was independently observed by cameras in three countries in the
southern hemisphere (Australia, New Zealand, and South Africa).  The shower
had a median geocentric radiant with coordinates R.A. = 349.06 deg, Decl. =
-79.83 deg, within a circle with a standard deviation of +/- 1.05 deg (equinox
J2000.0).  The radiant drift in R.A. is 4.7 deg on the sky per degree of solar
longitude and 0.9 deg in Decl., both referenced to solar longitude 62.3 deg.
The median geocentric, sun-centered ecliptic longitude (L-L0) being 229.94
deg, and geocentric ecliptic latitude -62.86 deg.  The geocentric velocity was
40.6 +/- 0.3 km/s.  The orbital elements are those of a Halley-type comet
(Tisserand's parameter of 1.0 +/- 0.4):  q = 0.9269 +/- 0.0066 AU, e = 0.91
+/- 0.05, i = 66.6 +/- 1.2 deg, Peri. = 34.5 +/- 1.6 deg, Node = 242.2 +/-
0.7 deg (equinox J2000.0).  All shower meteors appeared during the solar-
longitude interval 61.1-63.4 degrees, with a peak at 62.3 deg.  A parent-body
search returned no candidates with a Southworth and Hawkings D criterion
value lower than 0.35.  The new shower received the working designation
M2025-K1 from the IAU Meteor Data Center.


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                         (C) Copyright 2025 CBAT
2025 June 2                      (CBET 5559)              Daniel W. E. Green