Electronic Telegram No. 4882
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)
Prepared using the Tamkin Foundation Computer Network


29 PISCID METEOR SHOWER IN 2019
     P. Jenniskens, SETI Institute and NASA Ames Research Center, reports
unusual meteor shower activity observed in mid-October 2019 from a
low-inclination stream, with additional activity seen in mid-Nov. 2019.  Also,
six meteors from this stream were detected by CAMS California imagers in 2014.
So far, the shower has not been detected in 2020.  During 2019 Oct. 17-18 UT,
a cluster of 26 meteors was detected with a radiant near 29 Psc by nearly all
of the CAMS low-light video networks.  The shower is now listed as number 1046
in the IAU Working List of Meteor Showers and is named the 29 Piscids.  The
meteors radiated from a median radiant with coordinates R.A. = 4.3 +/- 0.6
deg, Decl. = -2.7 +/- 0.5 deg (equinox J2000.0) and heliocentric velocity 15.2
+/- 1.3 km/s.  Median orbital elements and observed dispersions (1 sigma) are
those of a low-inclination Jupiter-family comet:  q = 0.8166 +/- 0.0096 AU,
semi-major axis about 2.83 AU, e = 0.709 +/- 0.069, i = 1.9 +/- 0.3 deg, Peri.
= 55.3 +/- 0.8 deg, Node = 24.1 +/- 0.6 deg, and longitude of perihelion =
79.1 +/- 0.6 deg (equinox J20000.0).  The combined activity period extended
from solar longitude 202.3 to 205.0 degrees (equinox J2000.0) with a maximum
on 204.0 +/- 0.1 deg (look to the right of the anti-helion source at website
URL https://nam03.safelinks.protection.outlook.com/?url=http%3A%2F%2Fcams.seti.org%2FFDL%2F&data=04%7C01%7Cpjenniskens%40seti.org%7Ccf0d24580b244857124108d87c1bf9f1%7Cdeac5258294749c2a474e8ab151104fb%7C0%7C0%7C637395806894255810%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=ADtgrTMfnZfBD3XTMhh%2FVfAKa75mN3zBrdmnXtoYAxo%3D&reserved=0 for the dates of 2019 Oct. 17-18).
     One month later, during 2019 Nov. 11-18 UT, another period of outburst
activity was observed that appears to be associated with the same parent body,
given the similar eccentricity and longitude of perihelion of the orbit, when
93 meteors were triangulated with median radiant R.A. = 6.8 +/- 1.1 deg, Decl.
= -7.2 +/- 1.2 deg, and geocentric velocity 10.8 +/- 1.4 km/s.  Activity
stretched between solar longitude 228.3 and 234.9 deg and peaked at 231.4 deg
(cf. the above website for the dates of 2019 Nov. 11-18).  Median orbital
elements are q = 0.943 +/- 0.007 AU, semi-major axis about 3.10 AU, e = 0.693
+/- 0.103, i = 2.7 +/- 0.4 deg, Peri. = 27.5 +/- 1.7 deg, Node = 51.3 +/- 1.6
deg, and longitude of perihelion = 78.9 +/- 0.9 deg.  There is a distinct
trend of q versus Node, and the November observations align with those from
October approximately as q = 0.318 + 0.36519 * 10[log(Node)], for Node in
the range 23-54 deg.
     The following "Cameras for All-sky Meteor Surveillance" (CAMS) Networks
(cf. Jenniskens 2011, Icarus 216, 1) contributed to the data above:  CAMS
California (coordinated by Jenniskens), CAMS Florida (A. Howell), CAMS
BeNeLux (C. Johannink), CAMS New Zealand (J. Baggaley), Lowell Observatory
CAMS (N. Moskovitz), UAE Astronomical Cameras Network (M. Odeh), CAMS South
Africa (T. Cooper), CAMS Arkansas (L. Juneau), CAMS Australia (M. Towner),
CAMS Chile (S. Heathcote and E. Jehin), and CAMS Namibia (T. Hanke).


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

                         (C) Copyright 2020 CBAT
2020 October 29                  (CBET 4882)              Daniel W. E. Green