Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Asteroid 2007 WD5 will not impact Mars on January 30!   The Monte Carlo method of the nominal orbit clonning was applied to the case
of 2007 WD5, the asteroid from the Apollo group. Calculations based on 33
observations from the time interval of 2007 11 08 - 2008 01 02 showed that the
asteroid will pass near planet Mars at the minimum distance of 10.9\pm 2.9
R_{Mars}, what implies that probability that 2007 WD5 strike the planet
decreased to the value of 0.03% from the value of about 3--4% previously
announced by NASA. The additional observations taken on January 3--9 reduce
further the asteroid's impact chances, effectively to nil: the asteroid will
pass near planet Mars at the minimum distance of 8.4\pm 1.1 R_{Mars}.

21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph
26
The categories of this paper are: bayes-an
16
The categories of this paper are: stat
17
The categories of this paper are: q-fin
10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
14
The categories of this paper are: math-ph
35
The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
3
The categories of this paper are: physics
7
The categories of this paper are: hep-th