Electronic Telegram No. 5614
Central Bureau for Astronomical Telegrams
Mailing address:  Hoffman Lab 209; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
e-mail:  cbatiau@eps.harvard.edu (alternate cbat@iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network


ONGOING METEOR OUTBURST OVER SOUTHERN HEMISPHERE
     P. Jenniskens, SETI Institute and NASA Ames Research Center; T. Cooper
and P. Mey, Cameras for Allsky Meteor Surveillance (CAMS) low-light video
survey, South Africa; T. Hanke and E. Fahl, CAMS Namibia; S. Heathcote, E.
Jehin, and T. Abbott, CAMS Chile; J. Scott and W. J. Baggaley, CAMS New
Zealand; D. Rollinson and H. Devillepoix, CAMS Australia; and M. Odeh, United
Arab Emirates Astronomical Camera Network, report a meteor outburst of a
previously unknown shower in the southern hemisphere this past week, possibly
ongoing.  Starting at solar longitude 169 deg, in steps of 1 deg, the
following number of shower members were triangulated:  1, 0, 0, 7, 2, 1, 2,
3, 6, 10.  These have a compact radiant in sun-centered coordinates lambda
= 159.4 +/- 1.0, beta = -70.8 +/- 0.7 deg.  The geocentric radiant is near
the star gamma Horologii, centered at R.A. = 40.9 +/- 2.0 deg, Decl. = -66.4
+/- 0.3 deg, with geocentric velocity 21.4 +/- 0.2 km/s around solar longitude
177.92 +/- 0.54 deg (cf. website URL http://cams.seti.org/FDL/ for the dates
of 2025 Sept. 15-26).  This gamma-Hor shower is not listed in the Jenniskens
(2023) *Atlas of Earth's Meteor Showers*.  Orbital elements are centered at
a = 3.32 AU, q = 0.964 +/- 0.002 AU, e = 0.710 +/- 0.014, i = 31.9 +/- 0.4
deg, Peri. = 25.4 +/- 0.6 deg, Node = 357.93 +/- 0.54 deg (equinox J2000.0).
These orbits have a Tisserand parameter of 2.52 +/- 0.07, suggesting a
parent Jupiter-family comet.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2025 CBAT
2025 September 27                (CBET 5614)              Daniel W. E. Green