Daylight observations of the 1965 F comet at the Sacramento Peak Observatory

The comet 196Sf was seen and observed from the Sacramento Peak Observatory during the daylight hours from 16:22 to 23:19 UT on 20 October 1965 and from 15:56 to 17:42 UT on 21 October 1965. During these periods a coordinate effort was made by the entire staff to utilize a maximum of the solar instruments on the comet. A list of all the solar and comet observations is presented. The former, mostly coronal, were made in an attempt to detect any influence of the comet on the corona; the latter to gather data on the comet itself. Coronal green line movies and coronal spectra around X6564 and X5303 were taken with dispersion of 9.2 and 2.2 A/mm. Similar spectra were taken of the comet's head and tail. The Sacramento Peak Observatory (SPO) 16-in. coronograph, in combination with a small universal spectrograph (3600-8000 A; 2.5 A/mm) was used to obtain spectra of both the head and the tail of the comet. Polarization measurements were made by placing a polaroid in front of the spectrograph slit. Finally, photoelectric scans (dispersion of 5 mm/A) were taken in the sodium D lines region and color photographs of the comet were taken on 35 mm film. A table of the most conspicuous lines appearing in the comet spectra is presented as well as the results of an analysis of the Na D lines profiles obtained photoelectrically. The emission redshift and absorption blueshift of the Na D lines are discussed.