Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A few remarks about the Pioneer anomaly   Some features of the Pioneer anomaly are discussed in context of author's
explanation of this effect as a deceleration of the probes in the graviton
background. It is noted that if the model is true then the best parameter of
the anomalous acceleration should be not the distance to the Sun but a cosine
of the angle between a velocity of the probe and its radius-vector.

28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess
4
The categories of this paper are: cond-mat
35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
24
The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th
18
The categories of this paper are: econ
13
The categories of this paper are: quant-ph