Abstract :
[en] P. Jenniskens, SETI Institute and NASA Ames Research Center, reports the detection of an outburst of the February Hydrid meteors (IAU shower 1032) by the global Cameras for Allsky Meteor Surveillance (CAMS) low-light video- camera networks (cf. website URL http://cams.seti.org/FDL/ for dates of 2023 Feb. 11-17, below the antihelion source). A total of twenty-nine February Hydrid meteors were triangulated during the solar longitude range of 321.9- 327.2 deg (equinox J2000.0), radiating from a median geocentric radiant (with standard errors) of R.A. = 123.76 +/- 0.13 deg, Decl. = +0.38 +/- 0.17 deg, with geocentric velocity 16.39 +/- 0.14 km/s. The corresponding orbital elements are centered at a = 2.80 +/- 0.08 AU, q = 0.8223 +/- 0.0018 AU, e = 0.705 +/- 0.006, i = 8.56 +/- 0.07 deg, Peri. = 53.72 +/- 0.23 deg, Node = 145.43 +/- 0.23 deg (equinox J2000.0). This Jupiter-family comet shower was previously in outburst in 2013 (N = 3) and 2018, when it was first recognized from twelve triangulated orbits (cf. Jenniskens et al. 2018, PSS 154, 21). The shower is nearly absent in CAMS data in other years. The episodic returns and measured semi-major axis are consistent with a 4.7-year periodicity from dust trapped in the 5:2 mean motion resonance with Jupiter. The following camera networks detected this shower: CAMS California (coordinated by J. Albers, E. Egland, B. Grigsby, and T. Beck), CAMS Florida (A. Howell), CAMS BeNeLux (C. Johannink, and M. Breukers), Lowell Observatory CAMS (N. Moskovitz, S. Hemmelgarn, and B. Rachford), United Arab Emirates Astronomical Camera Network (M. Odeh), CAMS Arkansas (L. Juneau and S. Austin), CAMS Australia (M. Towner and D. Rollinson), CAMS Chile (S. Heathcote, E. Jehin, and T. Abbott), CAMS Namibia (T. Hanke, E. Fahl, and R. van Wyk), and CAMS Texas (W. Cooney).
