Paper:	Astrometric Determination of VSOP-2 Orbital Parameters
Volume:	402, Approaching Micro-Arcsecond Resolution with VSOP-2: Astrophysics and Technologies
Page:	310
Authors:	Fomalont, E.; Moellenbrock, G.; Claussen, M.
Abstract:	VSOP-2 phase referencing, needed to image faint sources and to determine accurate positions, will require an orbit accuracy of about 2 cm at 23 GHz. This accuracy, however, may not be obtainable by direct orbital measurements. We propose an observation scheme, similar to that used at the VLBA, to be included during a phase referencing observation of about one orbit in order to determine a more accurate orbit determination. We show the effects of orbit errors, explain the suggested observations and reduction methods, and discuss the potential problems that might impede the use of this technique.

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