The following document lists the file abstract/PHT_CAL_54204C2S.abs
from catalogue VI/111.
A plain copy of the file
(without headers/trailers) may be downloaded.
The level of the sun straylight is assessed during the solar eclipse period in September-October 97. The telescope is pointed to a position on the sky which has a solar aspect angle of 60 degrees. The absolute sky brightness is monitored when entering the umbra period and exiting it. Any measurable difference signal can be attributed to sun strayligth. In order to calibrate the signal difference absolutely a measurement on a celestial primary standard is performed on the same revolution. At 170 micron this is the star HR6705 (Gamma Dra).