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Astron. Astrophys. 321, L13-L16 (1997)

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2. Observations

The SWS grating spectrum of Saturn was recorded on June 15, 1996. Descriptions of the ISO satellite and the SWS instrument can be found in Kessler et al. (1996) and de Graauw et al. (1996) respectively. The SWS flux and wavelength calibrations are described in Schaeidt et al. (1996) and Valentijn et al. (1996). The aperture (14"x20" below 12.5 µm, 14"x27" above) was centered on the center of Saturn's disk, with the long axis aligned perpendicular to the ecliptic, and thus roughly aligned with the central meridian (polar angle = 3.6 deg.). The exposure time was 110 minutes. The resolving power is about 1500, and the estimated accuracy of the flux scale is about 20 percent. In addition to the standard reduction, the 14-16 µm region was subsequently FFT filtered in order to minimize the distortions by the instrumental fringing.

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© European Southern Observatory (ESO) 1997

Online publication: June 30, 1998