Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Precision Timing Measurements of PSR J1012+5307   We present results and applications of high precision timing measurements of
the millisecond pulsar J1012+5307. Combining our radio observations with
results based on optical observations, we derive complete 3-D velocity
information for this system. Correcting for Doppler effects, we derive the
intrinsic spin parameters of this pulsar and a characteristic age of 8.6 +/-
1.9 Gyr. Our upper limit for the orbital eccentricity of only 8 * 10^-7 (68%
C.L.) is the smallest ever measured for a binary system. We demonstrate that
this makes the pulsar an ideal laboratory to test certain aspects of
alternative theories of gravitation. Our precise measurements suggest
deviations from a simple pulsar spin-down timing model, which are consistent
with timing noise and the extrapolation of the known behaviour of slowly
rotating pulsars.

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The categories of this paper are: nlin
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The categories of this paper are: funct-an
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The categories of this paper are: math-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: alg-geom
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The categories of this paper are: mtrl-th
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The categories of this paper are: dg-ga
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The categories of this paper are: ao-sci
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The categories of this paper are: solv-int
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The categories of this paper are: supr-con
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The categories of this paper are: hep-lat
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The categories of this paper are: eess
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The categories of this paper are: q-bio
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The categories of this paper are: adap-org
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The categories of this paper are: atom-ph
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The categories of this paper are: bayes-an