Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: High precision meteor observations with the Canadian Automated Meteor
  Observatory -- Data reduction pipeline and application to meteoroid
  mechanical strength measurements   Context. The mirror tracking system of the Canadian Automated Meteor
Observatory (CAMO) can track meteors in real time, providing an effective
angular resolution of 1 arc second and a temporal resolution of 100 frames per
second.
  Aims. We describe the upgraded hardware and give details of the data
calibration and reduction pipeline. We investigate the influence of meteor
morphology on radiant and velocity measurement precision, and use direct
observations of meteoroid fragmentation to constrain their compressive
strengths.
  Methods. On July 21, 2017, CAMO observed a ~4 second meteor on a JFC orbit.
It had a shallow entry angle ~8 deg and 12 fragments were visible in the
narrow-field video. The event was manually reduced and the exact moment of
fragmentation was determined. The aerodynamic ram pressure at the moment of
fragmentation was used as a proxy for compressive strength, and strengths of an
additional 19 fragmenting meteoroids were measured in the same way. The
uncertainty in the atmosphere mass density was estimated to be +/-25% using
NAVGEM-HA data.
  Results. We find that meteor trajectory accuracy significantly depends on
meteor morphology. The CAMO radiant and initial velocity precision for
non-fragmenting meteors with short wakes is ~0.5' and 1 m/s, while that for
meteors with fragments or long wakes is similar to non-tracking, moderate field
of view optical systems (5', ~50 m/s). Measured compressive strengths of 20
fragmenting meteoroids (with less precise radiants due to their morphology) was
in the range of 1-4 kPa, which is in excellent accord with Rosetta in-situ
measurements of 67P. Fragmentation type and strength do not appear to be
dependent on orbit. The mass index of the 12 fragments in the July 21 meteoroid
was very high (s = 2.8), indicating possible progressive fragmentation.

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The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
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The categories of this paper are: nucl-th
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The categories of this paper are: q-alg
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The categories of this paper are: funct-an
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The categories of this paper are: math
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The categories of this paper are: gr-qc
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The categories of this paper are: bayes-an
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The categories of this paper are: alg-geom
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The categories of this paper are: ao-sci
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The categories of this paper are: acc-phys
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The categories of this paper are: cs
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The categories of this paper are: adap-org
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The categories of this paper are: physics
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The categories of this paper are: atom-ph
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The categories of this paper are: chao-dyn