[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

     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      superseded by text appearing later in the printed IAU Circulars.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

More information about the Iaude mailing list