A new approach to micro-arcsecond astrometry with SIM allowing early mission narrow angle measurements of compelling astronomical targets
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Space Interferometry Mission science↗
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Picometer laser metrology for the Space Interferometery Mission
This paper reports the progress on displacement measuring laser heterodyne interferometers for the SIM program. We will also describe the technical approaches and results from ground testbeds.
interferometry↗
An attitude control system for the SIM Test Bed 3 (STB3)
In this paper, the details of the design, construction and performance of the attitude control system are presented. The attitude control system has been used to meet certain SIM requirements. An example of this performance test is also included.
spaceborne↗
MAM testbed data analysis: cyclic averaging
The micro-arcsecond metrology testbed (MAM) provides a testing ground for SIM to perform optical path difference measurements with picometer (pm) precision.
space↗
Retroreflector Diffraction Modeling
The SIM metrology subsystem utlizes cornercube retroreflectors as fiducials.
retroreflectors↗
Very high-precision absolute surface metrology gauges for building and qualifying SIM testbed interferometer compound optics
In this paper the details of the design, construction and performance of these triplet of interferometers are presented.
spaceborne↗
Systems Engineering and Application of System Performance Modeling in SIM Lite Mission
The SIM Lite Astrometric Observatory will be the first space-based Michelson interferometer operating in the visible wavelength, with the ability to perform ultra-high precision astrometric measurements on distant celestial objects. SIM Lite data will address in a fundamental way questions such as characterization of Earth-mass planets around nearby stars. To accomplish these goals it is necessary to rely on a model-based systems engineering approach - much more so than most other space missions. This paper will describe in further detail the components of this end-to-end performance model, called "SIM-sim", and show how it has helped the systems engineering process.
Exoplanet↗
SIM internal metrology beam launcher development
In this paper, we present some of the experimental results from a laboratory demonstration unit and design considerations for SIM's internal metrology beam launcher.
metrology↗
Microdynamic Behavior of a Joint-Dominated Structure On-Orbit
The Interferometry Program Experiments (IPEX) I and II are the first free-flying space experiments specifically designed to characterize the sub-micron dynamic behavior of large flexible structures subjected to on-orbit thermal and mechanical disturbances.
Interferometry↗
Dim star fringe stabilization demonstration using pathlength feed-forward on the SIM Test-Bed 3 (STB3)
This paper describes the STB3 setup, the pathlength feed-forward architecture, implementation issues and data collected with the system.
Space↗
External merology truss technology demonstration (KITE)
To achieve micro-arcsecond astrometry, SIM's external metrology system must track the relative changes of three baseline vectors with a precision of tens of picometers over a one-hour time scale.
metrology interferometry corner cube truss picomet↗
Quasar astrophysics with the space interferometry mission
This paper estimates the size of the astrometric signatures which may be expected, and discusses prospects for using astrometry as a fundamental tool for understanding quasar nuclei.
quasar astrometry SIM↗
A comparison of four precise global positioning system geodetic receivers
Four precise global positioning system (GPS) geodetic receivers were operated simultaneously in January and February 1984 over ten baselines ranging in distance from 13 to 1304 km. Several of the baselines had been previously measured using very long baseline interferometry and, therefore, provide very good standards to which the satellite results can be compared. Results of these experiments are presented along with a brief description of each receiver and the associated analysis techniques.
Goad, C. C.↗
Interferometry Program Flight Experiment #1: Objecties and Results
The Interferometry Program EXperiments (IPEX) I and II are a series of flight experiments designed to characterize microdynamics of structures in space.
thermo↗
SIM external metrology beam launcher (QP) development
This paper discusses the progress in the development of optical interferometers for use in distance measurement gauges with systematic errors below 100 picometers.
interferometers↗
Stellar Interferometry from the Ground and Space
Stellar Interferometry began more than 80 years ago with the pioneering measurement of the diameter of Betelqueuse by Michelson and Pease using a 20 foot beam mounted at the top of the 10011 Hooker telescope at Mt. Wilson. Essentially no other work was done in this field until the 1960's when Hanbury-Brown and his colleagues developed and used the Intensity Interferometer at Narrabri, Australia to measure the diameters of a number of important hot stars. The modern period of Stellar Interferometry really began in the 1970's with the successes of 3 or 4 small research groups in the US and Europe, and scientific and technical progress in the field has been outstanding, particularly in the last decade. This has lead to the development of two major ground based facilities: NASA's own Keck Interferometer and ESO's Very Large Telescope Interferometer, and a number of space interferometers such as the Space Interferometer Mission (SIM), and the Terrestrial Planet Finder (TPF), among others. I will review the principles, history, and scientific progress in the field both on the ground and in space, and I will discuss a mission concept under development here at NASA Goddard, the Fourier-Kelvin Stellar Interferometer, a near-term mid-infrared imaging interferometer, which can serve as a scientific and technical pre-cursor for some of the more ambitious concepts being discussed within the Astronomical and NASA communities.
Danchi, William C.↗