[Iaude] CBET 4837: CHI CYG METEORS 2020

quai at eps.harvard.edu quai at eps.harvard.edu
Sat Aug 22 01:14:26 EDT 2020


                                                  Electronic Telegram No. 4837
Central Bureau for Astronomical Telegrams
Mailing address:  Hoffman Lab 209; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
e-mail:  cbatiau at eps.harvard.edu (alternate cbat at iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network


CHI CYGNID METEOR SHOWER 2020
     P. Jenniskens, SETI Institute and NASA Ames Research Center, reports
that the CAMS low-light video surveillance networks in Australia, South
Africa, Namibia, and Chile recorded an outburst of slow meteors from a compact
radiant between the constellations Delphinus and Aquila on 2020 Aug. 20/21
(cf. website URL http://cams.seti.org/FDL/ for date of Aug. 21).  The shower
may be ongoing.  Meteors radiated from a geocentric radiant at R.A. = 304.7
+/- 1.0 deg, Decl. = +8.5 +/- 1.0 deg, with geocentric velocity 17.0 +/- 0.4
km/s during solar longitude 147.6-148.4 deg, corresponding to Aug. 20.50-21.29
The eight measured orbits have median orbital elements a = 2.95 +/- 0.17 AU,
q = 0.830 +/- 0.008 AU, e = 0.716 +/- 0.017, i = 12.7 +/- 0.6 deg, Peri. =
235.3 +/- 1.3 deg, and Node = 148.0 +/- 0.3 deg (equinox J2000.0).  The
longitude of perihelion of the median orbit is 23.5 +/- 1.3 deg.  The
meteoroids appear to originate from an unknown Jupiter-family comet.  The
CAMS automated software identified this shower as the Chi Cygnids (IAU shower
number 757), first detected by CAMS in 2015 during the period Sept. 14-25 (cf.
Jenniskens, CBET 4144; Koukal et al. 2016, JIMO 44, 5).  That shower had a
higher inclination of i = 18.6 +/- 1.6 deg with a radiant in the constellation
Cygnus, but the same longitude of perihelion of 21.5 +/- 1.9 deg.
     CAMS Namibia is coordinated by T. Hanke (the H.E.S.S. Collaboration),
CAMS Chile by S. Heathcote (AURA/Cerro Tololo) and E. Jehin (University of
Liege), CAMS Australia by M. Towner (Curtin University), and CAMS South Africa
by T. Cooper (Meteor Section, Astronomical Society of Southern Africa).


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2020 CBAT
2020 August 22                   (CBET 4837)              Daniel W. E. Green



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