October 5 - outburst of October Camelopardalids

The dust trail of an unknown long-period comet wandered in Earth's path on October 5. The outburst of October Camelopardalids (IAU code "OCT") peaked at around 14:45 UT. CAMS California recorded 9 meteors from a compact radiant between 8:45 and 13:15 UT, while the the new network in the United Arab Emirates on the other side of Earth detected 3 between 14:48 and 19:15 UT. 

CBET telegram follows:

Electronic Telegram No. 4329
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


P. Jenniskens, SETI Institute and NASA Ames Research Center, reports that the October Camelopardalids meteor shower, previously in outburst in 2005 (cf., Jenniskens et al. 2005, JIMO 33, 125), was predicted by E. Lyytinen (Helsinki, Finland) to peak on 2016 Oct. 5d14h45m UTC (at solar longitude 192.56 degrees, equinox J2000.0) when the earth crossed again the 1-revolution dust trail of an unknown long-period parent comet (cf., Lyytinen, IMO 2016 Meteor Shower Calendar, ed. by J. Rendtel). In good agreement, Lyytinen reports that the Finnish Video Meteor Network detected sixteen October Camelopardalids in single-station video observations just after dark between 17h and 19h UTC on Oct. 5.

Jenniskens adds that the CAMS network in California started observations on Oct. 5d02h45m UTC and detected nine multi-station October Camelopardalid meteors between 8h54m and 13h15m UTC on Oct. 5, while the new United Arab Emirates Astronomical Camera Network (a CAMS network operated by M. Odeh of the International Astronomical Center in Abu Dhabi) started observations on Oct. 5d14h45m UTC and captured three shower meteors between 14h48m and 19h15m UTC, and no more after this until observations ceased at dawn on Oct. 6d01h40m UTC. The median geocentric radiant was at R.A. = 171.1 +/- 5.0 deg, Decl. = +78.4 +/- 1.0 deg, with entry velocity 45.4 +/- 0.8 km/s, corresponding to orbital elements q = 0.990 +/- 0.005 AU, e = 0.93 +/- 0.08, i = 77.1 +/- 1.0 deg, Peri. = 168.2 +/- 2.5 deg, and Node = 192.41 +/- 0.15 deg (equinox J2000.0). In a live tally administered by H. Sugimoto, Japanese radio forward- scatter meteor observations confirm the outburst centered on Oct. 5d14h45m +/- 15m UTC (solar longitude 192.56 +/- 0.01), with elevated rates between 12h and 18h on Oct. 5 (see zenithal-hourly-rate plots at the following website URL: http://www5f.biglobe.ne.jp/~hro/Flash/2016/OCT/index.html).

Based on the new observations, Lyytinen re-calculated the 1-revolution dust trail position, assuming an orbital period for the parent comet of about 750 years and ejection of meteoroids at perihelion in 1255 AD. From the motion of the trail near the earth's orbit, the shower may return next year at solar longitude 192.558 deg (2017 Oct. 5d20h47m UTC), passing the earth's orbit +0.00021 AU further out than in 2016, while having passed the earth's orbit at -0.00001 AU in 2005, -0.00132 AU in 2006, +0.00069 AU in 2007, +0.00024 AU in 2012, and at larger distances in the years in between.

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

                         (C) Copyright 2016 CBAT
2016 October 12                  (CBET 4329)              Daniel W. E. Green