Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: 2014-2015 Multiple Outbursts of 15P/Finlay   Multiple outbursts of a Jupiter-family comet, 15P/Finlay, occurred from late
2014 to early 2015. We conducted an observation of the comet after the first
outburst and subsequently witnessed another outburst on 2015 January 15.6-15.7.
The gas, consisting mostly of C2 and CN, and dust particles expanded at speeds
of 1,110 +/- 180 m/s and 570 +/- 40 m/s at a heliocentric distance of 1.0 AU.
We estimated the maximum ratio of solar radiation pressure with respect to the
solar gravity beta_max = 1.6 +/- 0.2, which is consistent with porous dust
particles composed of silicates and organics. We found that 10^8-10^9 kg of
dust particles (assumed to be 0.3 micron - 1 mm) were ejected through each
outburst. Although the total mass is three orders of magnitude smaller than
that of the 17P/Holmes event observed in 2007, the kinetic energy per unit mass
(104 J/kg) is equivalent to the estimated values of 17P/Holmes and 332P/2010 V1
(Ikeya-Murakami), suggesting that the outbursts were caused by a similar
physical mechanism. From a survey of cometary outbursts on the basis of
voluntary reports, we conjecture that 15P/Finlay-class outbursts occur >1.5
times annually and inject dust particles from Jupiter-family comets and
Encke-type comets into interplanetary space at a rate of ~10 kg/s or more.

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The categories of this paper are: adap-org
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The categories of this paper are: ao-sci
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The categories of this paper are: supr-con
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The categories of this paper are: solv-int
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The categories of this paper are: eess
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The categories of this paper are: math-ph
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The categories of this paper are: funct-an
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The categories of this paper are: chem-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: dg-ga
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The categories of this paper are: cmp-lg
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The categories of this paper are: mtrl-th
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The categories of this paper are: quant-ph