Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A 3-dimensional model of tangential YORP   Tangential YORP, or TYORP, has recently been demonstrated to be an important
factor in the evolution of an asteroid's rotation state. It is complementary to
normal YORP, or NYORP, which used to be considered previously. While NYORP is
produced by non-symmetry in the large-scale geometry of an asteroid, TYORP is
due to heat conductivity in stones on the surface of the asteroid. Yet to date
TYORP has been studied only in a simplified 1-dimensional model, substituting
stones by high long walls.
  This article for the first time considers TYORP in a realistic 3-dimensional
model, also including shadowing and self-illumination effects via ray tracing.
TYORP is simulated for spherical stones lying on regolith. The model includes
only 5 free parameters, and the dependence of the TYORP on each of them is
studied. The TYORP torque appears to be smaller than previous estimates from
1-dimensional model, but still comparable to the NYORP torques.
  These results can be used to estimate TYORP of different asteroids, and also
as a basis for more sophisticated models of TYORP.

16
The categories of this paper are: stat
1
The categories of this paper are: cs
5
The categories of this paper are: gr-qc
32
The categories of this paper are: atom-ph
12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn
27
The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
2
The categories of this paper are: math
13
The categories of this paper are: quant-ph
23
The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con