ASTRA (ASTrometric and phase-Referencing Astronomy) is an upgrade to the existing Keck Interferometer which aims at providing new self-phase referencing (high spectral resolution observation of YSOs), dual-field phase referencing (sensitive AGN observations), and astrometric (known exoplanetary systems characterization and galactic center general relativity in strong field regime) capabilities. With the first high spectral resolution mode now offered to the community, this contribution focuses on the progress of the dual field and astrometric modes.
@article{arxiv.1208.3272,
title = {ASTRA: ASTrometry and phase-Referencing Astronomy on the Keck interferometer},
author = {J. Woillez and R. Akeson and M. Colavita and J. Eisner and A. Ghez and J. Graham and L. Hillenbrand and R. Millan-Gabet and J. Monnier and J. -U. Pott and S. Ragland and P. Wizinowich and E. Appleby and B. Berkey and A. Cooper and C. Felizardo and J. Herstein and M. Hrynevych and O. Martin and D. Medeiros and D. Morrison and T. Panteleeva and B. Smith and K. Summers and K. Tsubota and C. Tyau and E. Wetherell},
journal= {arXiv preprint arXiv:1208.3272},
year = {2012}
}