Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Lately Exposed Amorphous Water Ice on Comet 49P/Arend-Rigaux   Comet 49P/ Arend-Rigaux, thought to be a low activity comet since the 1980's
was found to be active in its recent apparitions. Recent analysis of the data
obtained from Spitzer observation of the comet in 2006 compared with laboratory
spectra has revealed amorphous water ice on the surface. In addition, in 2012 a
jet was found to appear during its subsequent perihelion passage as witnessed
during an observation carried out on 26th March 2012 using the PRL telescope at
Mt. Abu. This confirms recent activity of Comet 49P/Arend-Rigaux due to the
volatile subsurface materials exposed after several passages close to the Sun.
Our result confirms the subsurface ices on cometary nuclei and insists for more
observations for a better understanding.

37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
32
The categories of this paper are: atom-ph
7
The categories of this paper are: hep-th
20
The categories of this paper are: acc-phys
18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn
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The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph
29
The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin
11
The categories of this paper are: hep-lat