Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Monitoring Observations of the Jupiter-Family Comet 17P/Holmes during
  2014 Perihelion Passage   We performed a monitoring observation of a Jupiter-Family comet, 17P/Holmes,
during its 2014 perihelion passage to investigate its secular change in
activity. The comet has drawn the attention of astronomers since its historic
outburst in 2007, and this occasion was its first perihelion passage since
then. We analyzed the obtained data using aperture photometry package and
derived the Afrho parameter, a proxy for the dust production rate. We found
that Afrho showed asymmetric properties with respect to the perihelion passage:
it increased moderately from 100 cm at the heliocentric distance r_h=2.6-3.1 AU
to a maximal value of 185 cm at r_h = 2.2 AU (near the perihelion) during the
inbound orbit, while dropping rapidly to 35 cm at r_h = 3.2 AU during the
outbound orbit. We applied a model for characterizing dust production rates as
a function of r_h and found that the fractional active area of the cometary
nucleus had dropped from 20%-40% in 2008-2011 (around the aphelion) to
0.1%-0.3% in 2014-2015 (around the perihelion). This result suggests that a
dust mantle would have developed rapidly in only one orbital revolution around
the sun. Although a minor eruption was observed on UT 2015 January 26 at r_h =
3.0 AU, the areas excavated by the 2007 outburst would be covered with a layer
of dust (<~ 10 cm depth) which would be enough to insulate the subsurface ice
and to keep the nucleus in a state of low activity.

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The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci
34
The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn
26
The categories of this paper are: bayes-an
35
The categories of this paper are: mtrl-th
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
20
The categories of this paper are: acc-phys
29
The categories of this paper are: funct-an
24
The categories of this paper are: dg-ga
8
The categories of this paper are: hep-ex