Electronic Telegram No. 5636
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


CHANGE IN STATUS FOR TEN METEOR SHOWERS
     G. Kokhirova, National Academy of Sciences of Tajikistan; M. Hajdukova,
Slovak Academy of Sciences; T. J. Jopek, A. M. University, Poznan; M. Koseki,
Nippon Meteor Society; L. Neslusan, Slovak Academy of Sciences; R. Rudawska,
Starion Group and European Space Research and Technology Centre, European
Space Agency; J. Vaubaillon, Observatoire de Paris; D. Vida, University of
Western Ontario; and Q.-z. Ye, University of Maryland and Boston University,
report changes in the established showers listed within the IAU Meteor Data
Center (MDC; cf. website URL https://www.iaumeteordatacenter.org/).  These
changes were approved by the IAU Working Group on Meteor Shower Nomenclature.
     The established meteor showers are those reported by two or more authors.
Various authors observe different stream members as shower meteors during a
certain period of time.  The averaged parameters of such shower, determined
by one author (or author team) are called a "shower solution".  Different
solutions of a shower determined by various authors are unique
representations of the same shower observed at different period of time,
providing information about the compactness and dispersion of a given stream.
Some showers are characterized by two or more solutions (up to twelve at
present).  An "established" shower must be characterized by at least two
solutions to be regarded as reliable, since the determination of meteor
parameters, and therefore shower parameters, can still be achieved with much
lower accuracy than that of an asteroid or comet.  While a minor planet or
comet can be observed for minutes or even hours (and repeatedly), a meteor
can be detected only once, for a fraction of a second to a few seconds.
In the MDC archive, each set of reported parameters -- a shower solution --
is distinguished by an additional number, denoted AdNo, that is connected to
the IAU number or code of the shower.
     In an attempt to correct the official MDC List of Showers, the IAU
Working Group reviewed these cases and approved the following changes to the
list.  A full analysis of each shower and the justification for its removal
will be published in the proceedings of the Meteoroids 2025 conference.
     (i) The established status of showers #100/XSA (Daytime xi-Sagittariids),
#128/MKA (Daytime kappa-Aquariids, #151/EAU (epsilon-Aquilids), #188/XRI
(Daytime xi-Orionids), #202/ZCA (Daytime zeta-Cancrids), #233/OCC (October
Capricornids), #324/EPR (epsilon-Perseids), #326/EPG (epsilon-Pegasids), and
#327/BEQ (beta-Equuleids) will be revoked; these showers will be moved from
the List of Established Showers to the Working List of Showers in the MDC.
     (ii) The shower solutions AdNo = 1 for #152/NOC (Northern Daytime
omega-Cetids) and for #512/RPU (rho-Puppids); and AdNo = 0 for #170/JBO
(June Bootids), for #183/PAU (Piscis Austrinids), and for #197/AUD (August
Draconids) are being moved from the List of Established Showers to the List
of Removed Showers.
     (iii) The shower #372/PPS (phi-Piscids), with solution AdNo = 0, will be
moved from the List of Established Showers to the Working List in the MDC and
will become a new shower; the shower will receive the preliminary designation
M2025-S3; the former record of this solution will also be archived in the
List of Removed Showers data.  The shower #372/PPS will be retained in the
List of Established Showers, represented by its solutions AdNo = 1, 2, and 4.


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

                         (C) Copyright 2025 CBAT
2025 November 8                  (CBET 5636)              Daniel W. E. Green