Primavlti

The PRIMA (Phase Reference Imaging and Microarcsecond Astrometry) instrument on the VLTI is the last VLTI first-generation instrument (along with VINCI, AMBER, and MIDI). It is due to be commissioned in 2008. The acronym actually describes an instrument with two very different functions:

• PRI (Phase Reference Imaging): this is, in effect, the recombiner plus two telescopes, transforming the VLTI into an imaging instrument;

• MA (Microarcsecond Astrometry): the astrometric instrument proper.

PRIMA has been greatly delayed, because its commissioning depends on the availability of a fast fringe sensor unit.

Table 8.2 Principal spectrographs in service or being developed for velocimetry

Instrument /

Telescope

Spectral range

Spectral

Reference

Radial-velocity

Reference /

commission date

Was this article helpful?

0 0

Post a comment