Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Astrometric Interferometry   Astrometry is a powerful technique in astrophysics to measure
three-dimensional positions of stars and other astrophysical objects, including
exoplanets and the gravitational influence they have on each other.
Interferometric astrometry is presented here as just one in a suite of powerful
astrometric techniques, which include space-based, seeing-limited and
wide-angle adaptive optics techniques. Fundamental limits are discussed,
demonstrating that even ground-based techniques have the capability for
astrometry at the single micro-arcsecond level, should sufficiently
sophisticated instrumentation be constructed for both the current generation of
single telescopes and long-baseline optical interferometers.

13
The categories of this paper are: quant-ph
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
26
The categories of this paper are: bayes-an
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex
2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat