Electronic Telegram No. 5159
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


18-AQUARIID METEOR SHOWER 2022
     P. Jenniskens, SETI Institute and NASA Ames Research Center, reports that
the CAMS low-light video camera networks have detected an ongoing outburst of
meteors with low-inclinatioon orbits in the anti-helion source (c.f. website
URL http://cams.seti.org/FDL/ for the date of 2022 Aug. 16).  Now that IAU
Commission F1 has introduced a new meteor-shower designation system, which
assigns a temporary designation based on the time of the report, this shower
is called M2022-Q1 and will likely be named the "18-Aquariids".  A total of
thirty-six meteors were triangulated between 2022 Aug. 15d20h37m and 16d12h02m
UT, but the shower is ongoing beyond this time (e.g., see website URL
http://cams.seti.org/FDL/for the date of 2022 Aug. 17).  The radiant around
solar longitude 143.1 deg was centered on the median geocentric position
R.A. = 324.7 +/- 0.2 deg, Decl. = -11.6 +/- 0.3 deg  (equinox J2000.0), with
geocentric velocity 24.2 +/- 0.3 km/s.  The median orbital elements are a =
3.16 AU, q = 0.547 +/- 0.025 AU, e = 0.823 +/- 0.069, i = 1.90 +/- 1.30 deg,
Peri. = 270.7 +/- 2.3 deg, aNode = 143.2 +/- 0.7 deg.  Perhaps coincidentally,
this orbit resembles that of lost comet D/1770 L1 (Lexell) during its returns
in 1770 and 1776 (a = 3.15 AU, q = 0.674 AU, e = 0.786, i = 1.55 deg, Peri. =
225.0 deg, Node = 134.5 deg).  The following CAMS networks contributed to this
report:  nine meteors were detected by LO-CAMS (coordinated by N. Moskovitz),
seven meteors were detected by CAMS California (station operators T. Beck, J.
Albers, E. Egland, and B. Grigsby), seven 18-Aquariid meters by CAMS Chile (S.
Heathcote, E. Jehin), five shower meteors by CAMS Florida (A. Howell), three
shower meteors by CAMS Texas (W. Cooney), two shower meteors by CAMS Arkansas
(L. Juneau), two shower meteors by CAMS Namibia (T. Hanke), and one meteor by
CAMS South Africa (T. Cooper).


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2022 CBAT
2022 August 17                   (CBET 5159)              Daniel W. E. Green