Session of pointing monitoring the 20-25 of July 2007 BR We check the evolution of the pointing sources used for the bolometer observations.
Summary
We observed the pointing sources doing a pointing and an Onf-Off measurements in most of the cases.
- 100 pointing sources observed and usable for the analysis
5 sources are found to be too faint (<100 mJy): J0121+044, J0750+827, J1056+702, J1628-143, J1909+486 J1628-143
- 16 observations of primary and secondary calibrators were done: Uranus, K3-50A, MWC349, LKHALF234, G34.3, CW-LEO, G10.62, NGC7538, G45.1
Pointing status
The plot below shows the azimuth (blue) and elevation (red) corrections.
attachment:pointingCorr20-25.06.07.png
From that pointing session, a new pointing model was derived by JP and implemented. The parameters P2 and P7 (offsets) were changed.
Flux
The pointing sources are normally radio-galaxies. They can present strong variation of their radio continuum flux. The goal of this monitoring session was to check the current flux of a sub-sample of pointing sources and flag the sources with a millimetric flux too low. In the current system the Xephem is written if the flux is larger than 100 mJy. The pointing source list for Xephem has been written to follow the update of the flux measurements.