Diff for "Pointing20-25.06.07"

Session of pointing monitoring the 20-25 of July 2007 BR We check the evolution of the pointing sources used for the bolometer observations.

TableOfContents

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

• 6 sources are found to be too faint (<100 mJy): J0121+044, J0750+827, J1056+702, J1628-143, J1909+486 J1628-143, J2106+216

• 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. BR Here is the list of the sources with a measured flux > 100 mJy and < 150 mJy: BR J1333-198 BR J2106+216 BR J1638-143 BR J2138-247 BR J2007+661 BR

Conclusions

• The 1 mm flux of about 100 sources was measured down to ~50 mJy with the bolometer Mambo2.
• The updated flux has allowed to give an updated picture of the pointing source flux. It allowed to update the XEphem files used for the observations with the updated flux.

• Still 1611 radio sources in the DB have an unknown flux.