European Southern Observatory
New Technology Telescope

General :
Observations :
Operations :

Pointing model

Instructions for executing a pointing model for NTT are described here, while the full monitoring of POM is here.
It is recommended, when possible (i.e. time), to execute a full model, with 64 stars.
Once you have a satisfactory fits, follow these steps:

Current pointing values should be under /vltdata/config as pomNA.dat, pomNB.dat. before you do new measurements, go to /vltdata/config on wt5tcs and rename the file pomNB.dat (or pomNA.dat for Nasmyth A) to pomN.dat-yyyy-mm-dd
All the old models and the newly created one, which will be something named yyyy-mm-dd.model.dat, are on the /vltdata/pointing directory on wt5tcs.
Install the new model: the newly created file will be pomNB.dat (or pomNA.dat for Nasmyth A).
check the accuracy of the pointing by presetting to different stars on the sky and measure their position on the guideproble with respect to the center field. If time allows it, do the same with the instruments (EMMI/SOFI).

History data backup can be found on epu (till 2006-08-03, i.e. measures done by Javier Argomedo on his last visit), at the directories:

sciweb/ntt/nttMetrics/TCS/tpoint/DATA
sciweb/ntt/nttMetrics/TCS/tpoint/MODELS

Send comments to: E. Pompei (epompei at eso dot org)
Last Update: December 12, 2006 Ela