July 26, 2006
ALMA Pointing
17
All-Sky Optical Pointing Results
VertexRSI
AEC
¥Both antennas ended-up with a 13-term pointing model.
¥Approximately 100-200 stars observed over 1-2 hours for each measurement.
¥Seeing/vibration contribution of approximately 1.5 arcsec:
¥Consistent with radiometric tracking tests which showed radiometric seeing.
¥When taken account of in all-sky pointing RMS, reduces VertexRSI/AEC pointing performance to 0.8/1.7 arcsec, respectively.