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Astrometry

If better positional accuracy is required than provided by ALMA by default (due to use of a standard calibration scheme or default observing conditions), this can be indicated using the controls in this panel.

Currently, an astrometry mode has not been formally commissioned but it would still be useful if PIs could indicate if enhanced positional accuracy is required by clicking the appropriate button. If this is done, a Technical Justification box must be completed any should include any relevant details including why the enhanced accuracy is required. Users should consult the Proposer's Guide and Technical Handbook for more details.

It is not possible to select enhanced accuracy for solar observations, Large Proposals, the Stand-alone ACA or for VLBI.



The ALMA OT Team, 2021 Feb 03