Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Color-Inclination Relation of the Classical Kuiper Belt Objects   We re-examine the correlation between the colors and the inclinations of the
Classical Kuiper Belt Objects (CKBOs) with an enlarged sample of optical
measurements. The correlation is strong (rho=-0.7) and highly significant (>8
sigma) in the range 0-34 deg. Nonetheless, the optical colors are independent
of inclination below ~12 deg, showing no evidence for a break at the reported
boundary between the so-called dynamically "hot" and "cold" populations near ~5
deg. The commonly accepted parity between the dynamically cold CKBOs and the
red CKBOs is observationally unsubstantiated, since the group of red CKBOs
extends to higher inclinations. Our data suggest, however, the existence of a
different color break. We find that the functional form of the
color-inclination relation is most satisfactorily described by a non-linear and
stepwise behavior with a color break at ~12 deg. Objects with inclinations >12
deg show bluish colors which are either weakly correlated with inclination or
are simply homogeneously blue, whereas objects with inclinations <12 deg are
homogeneously red.

29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn
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The categories of this paper are: supr-con
30
The categories of this paper are: q-alg
21
The categories of this paper are: adap-org
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
28
The categories of this paper are: alg-geom
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The categories of this paper are: eess
4
The categories of this paper are: cond-mat
7
The categories of this paper are: hep-th
2
The categories of this paper are: math
27
The categories of this paper are: comp-gas