chi cygnids

CAMS cameras in the Netherlands and California picked up a new shower in the night of September 14/15 (last Monday night). Now named the "chi Cygnids", the shower was not known before and not seen in the four previous years. Sky watchers would have noticed the occasional slow meteor radiate from a point between the stars beta and gamma Cygni. The new shower was announced in the September 17, 2015 CBAT telegram:

Peter Jenniskens, SETI Institute, reports the detection of an outburst from a new Jupiter-family comet shower, the chi Cygnids (given IAU number 757 and abbreviation CCY). Martin Breukers and Carl Johannink first noticed five nearly identical orbits in multi-station video observations of the CAMS BeNeLux network in the observing interval Sept. 14d19h23m-15d03h35m UT. Partial results from the CAMS California network add four meteors in the observing interval Sept. 15d03h10m-15d12h45m. The nine meteors detected appeared between Sept. 14d21h and 15d11h UT (solar longitude 171.54-172.08 deg).

The geocentric radiant is at R.A. = 301.0 +/- 2.2 deg, Decl. = +32.6 +/- 1.6 deg (equinox 2000.0), with velocity v_g = 15.1 +/- 0.9 km/s. The median orbital elements are (N = 9): q = 0.949 +/- 0.003 AU, a = 2.75 +/- 0.40 AU, e = 0.655 +/- 0.041, i = 18.6 +/- 1.6 deg, Peri. = 209.9 +/- 1.9 deg, Node = 171.64 +/- 0.23 deg (equinox 2000.0).

Confirmation of the outburst was found in the near-real time CMOR radar observations (P. Brown et al., University of Western Ontario), which are posted at website URL The 24-hr averaged maps showed a small concentration of radiants at this position during the observing period 15d05h15m-15d20h15m UT.