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Gamma Piscis Austrinid and Sigma Phoenicid Meteor Showers
Jenniskens, P.; Hanke, T.; Heathcote, S. et al.
2020In Central Bureau Electronic Telegrams, 4776, p. 1
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Abstract :
[en] P. Jenniskens, SETI Institute and NASA Ames Research Center, reports that two new long-period-comet-type meteor showers were detected by the southern-hemisphere CAMS networks on May 15-17 (cf. website URL http://cams.seti.org/FDL/ for dates of May 15-17). <P />The first shower, now called the gamma Piscis Austrinids (IAU shower 1034), radiated from geocentric radiant R.A. = 341.7 +/- 0.8 deg, Decl. = -31.0 +/- 0.4 deg (equinox J2000.0), with geocentric velocity 67.0 +/- 0.9 km/s during solar longitude 54.4-56.6 deg (centered on 55.4 +/- 0.8 deg), and corresponding to 2020 May 15d01h-17d09h UTC. The fifteen measured orbits have median orbital elements a about 18 AU, q = 0.986 +/- 0.005 AU, e = 0.946 +/- 0.074, i = 143.6 +/- 0.8 deg, Peri. = 341.6 +/- 2.2 deg, and Node = 235.5 +/- 0.8 deg (equinox J2000.0). The shower is more dispersed than the measurement error, suggesting that it may be an annual shower. <P />The second shower, now called the sigma Phoenicids (IAU shower 1035), radiated from a geocentric radiant R.A. = 355.0 +/- 1.0 deg, Dec. = -52.4 +/- 0.9 deg, with geocentric velocity 56.7 +/- 0.9 km/s during solar longitude 54.6-56.1 deg (centered on 55.4 +/- 0.4 deg), corresponding to 2020 May 15d07h-16d20h UTC. The fourteen measured orbits have median orbital elements a about 29 AU, q = 1.005 +/- 0.002 AU, e = 0.965 +/- 0.053, i = 104.7 +/- 1.3 deg, Peri. = 351.2 +/- 1.5 deg, and Node = 235.4 +/- 0.4 deg (equinox J2000.0). This shower is not significantly dispersed beyond the measurement error. Ten out of fourteen meteors were detected in a narrow 12-hr period, suggesting that the level of activity may be variable from year to year. <P />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), CAMS New Zealand by J. Baggaley (University of Canterbury), and CAMS South Africa by T. Cooper (Astronomical Society of Southern Africa, Meteor Section).
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Jenniskens, P.
Hanke, T.
Heathcote, S.
Jehin, Emmanuel  ;  Université de Liège - ULiège > Unités de recherche interfacultaires > Space sciences, Technologies and Astrophysics Research (STAR)
Towner, M.
Baggaley, J.
Cooper, T.
Language :
English
Title :
Gamma Piscis Austrinid and Sigma Phoenicid Meteor Showers
Publication date :
01 May 2020
Journal title :
Central Bureau Electronic Telegrams
Volume :
4776
Pages :
1
Peer reviewed :
Editorial reviewed
Available on ORBi :
since 24 November 2025

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