Radar meteoroid orbit stream searches using cluster analysis

Galligan, D. P.

doi:10.1046/j.1365-8711.2003.06348.x

Cited by 8 publications

(6 citation statements)

References 17 publications

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“…All observed radiants are located in the region of the Pisces constellation a few degrees above the ecliptic (dashed grey line). In addition, the positions of several meteor showers are marked: φ Aquariids [PAQ, #147 from Nilsson (1964)] and nine η Aquariids determined by different techniques and authors –Kashcheyev & Lebedinets (1967), Cook (1973), Sekanina (1973), Lindblad et al (1994), Galligan & Baggaley (2002), Galligan (2003), Brown et al (2008, 2009), Jopek et al (2008c). Also, we plotted the point representing theoretical radiant of the 1P/1909 Halley comet.…”

Section: Discussionmentioning

confidence: 99%

“…Till now, the Southern hemisphere meteoroid streams were identified using orbits determined by a radar technique (Nilsson 1964; Gartrell & Elford 1975; Jopek, Valsecchi & Froeschlé 1999b; Galligan & Baggaley 2002; Galligan 2003). The aim of this paper was to search for streams among the meteors observed at the southern part of the Earth globe (first time) by a video technique.…”

Section: Introductionmentioning

confidence: 99%

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Meteoroid streams identification amongst 231 Southern hemisphere video meteors

Jopek

Koten

Pećina

2010

Monthly Notices of the Royal Astronomical Society

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In this study, 231 video meteoroid orbits observed at the Southern hemisphere were searched for streams. Several searches have been made using three D‐criteria: DSH, DN and DV. The mutual D‐distances were processed by a cluster analysis algorithm based on the single neighbour linking technique. The values of the meteoroid association thresholds for groups of 2, 3, 4, … members were estimated by the statistical approach. In all three basic searches, about 29–33 per cent of the meteoroid sample turned out to belong to the stream component. The following streams have been detected: η Aquariids (ETA, #31), χ Capricornids (CCA, #420), May Microscopiids (MMI, #421), Northern and Southern Librids‐Luppids (NLL, #422; SLL, #423) and Northern and Southern May Ophiuchids (NOP, #149; SOP, #150). 12 η Aquariids were detected using each D‐function. Their mean orbital elements resemble the orbit of 1P/Haley; however, the mean semimajor axis and the activity time differ significantly from those determined by the other observers. 10 members of χ Capricornids and five members of May Microscopiids were found using the DN function only. For these streams, we did not find any counterparts among the streams listed in the IAU MDC. Our Librids‐Luppids and Ophiuchids form two separate complex groups which consist of 16 and 18 members, respectively. From a viewpoint of the cluster analysis technique, they are reliable significant structures. Our Ophiuchids are similar to the already known Northern and Southern May Ophiuchids. Near the mean radiant of Librids‐Luppids, we do not see any radiant of the known shower. Its possible counterpart, the Southern ω Scorpiids, has a radiant significantly shifted from our Librids‐Luppids. Thus, we consider Librids‐Luppids as a new stream or some new manifestation of the May Ophiuchids Complex. Also, this study has shown us that in case of complex structures, traditional procedures of meteor showers distinction are not sufficient tool to give unambiguous answers.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Meteoroid streams identification amongst 231 Southern hemisphere video meteors

Jopek

Koten

Pećina

2010

Monthly Notices of the Royal Astronomical Society

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“…They all tend to retrieve about 70% of simulated stream members in a noisy dataset of well-chosen cut-off levels (Galligan, 2003a(Galligan, , 2003b. Drummond (1981a) used a different set of weights to render each of the terms in natural units and linear over a similar range:…”

Section: (4)mentioning

confidence: 99%

Meteoroid streams that trace to candidate dormant comets

Jenniskens

2008

Icarus

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“…The single linkage algorithm was used in asteroid studies (Zappala et al 1995) and in many meteoroid stream searches (Baggaley & Galligan 1997; Galligan 2003a,b). Zappala et al (1995) identified the dynamical families from a sample of 12 487 asteroids.…”

Section: Introductionmentioning

confidence: 99%

Data analysis on the extrasolar planets using robust clustering

Jiang¹,

Yeh²,

Hung³

et al. 2006

Monthly Notices of the Royal Astronomical Society

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We use both the conventional and more recently developed methods of cluster analysis to study the data of extra-solar planets. Using the data set with planetary mass M, orbital period P , and orbital eccentricity e, we investigate the possible clustering in the lnM, lnP , lnP − lnM, e, and lnP − e spaces. There are two main implications: (1) mass distribution is continuous and (2) orbital population could be classified into three clusters, which correspond to the exoplanets in the regimes of tidal, on-going tidal and disc interaction, respectively.

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Radar meteoroid orbit stream searches using cluster analysis

Cited by 8 publications

References 17 publications

Meteoroid streams identification amongst 231 Southern hemisphere video meteors

Meteoroid streams identification amongst 231 Southern hemisphere video meteors

Meteoroid streams that trace to candidate dormant comets

Data analysis on the extrasolar planets using robust clustering

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