Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...19310607l&link_type=abstract
American Astronomical Society, 193rd AAS Meeting, #106.07; Bulletin of the American Astronomical Society, Vol. 30, p.1410
Astronomy and Astrophysics
Astronomy
Scientific paper
The Space Interferometry Mission (SIM) is a space-based interferometric observatory primarily dedicated to high-precision astrometric measurements. Unlike the European astrometric satellite Hipparcos, SIM will operate in various astrometric modes: grid mode, wide-angle mode, and narrow-angle mode. Each of these modes has a well defined purpose. We give here the results of extensive simulations for the wide-angle mode, showing the subtleties of relative astrometry -- as opposed to global astrometry. The results are mainly presented as variations of the final astrometric accuracy with respect to mission parameters such as number of observations per star, number of reference stars, mission length, measurement noise, and precision of the reference frame. We also revisit the idea of the rigidity equation, linking the mission accuracy to the single measurement accuracy and show how to derive optimal observing scenarios for SIM. We will briefly present the method we are currently implementing for the narrow-angle simulations, showing how SIM could detect invisible companions and which portion of phase-space could be reachable. Quantitative as well as qualitative results are given and emphasis is put on the distinction between precision and accuracy, as in any astrometric study.
Boden Andrew F.
Loiseau Sacha
Shao Maxine
Unwin Stephen C.
No associations
LandOfFree
Wide and narrow-angle astrometry simulations for SIM. does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Wide and narrow-angle astrometry simulations for SIM., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Wide and narrow-angle astrometry simulations for SIM. will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-997724