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| - Optical observations of Comet 67P/Churyumov-Gerasimenko
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| - From longslit spectra obtained during the 1996 perihelion passage of Comet 67P/Churyumov-Gerasimenko, a CN production rate of $\rm (1.35 \pm 0.35) \times 10^{25}$ molecules $\rm s^{-1}$ was determined and an upper limit for the $\rm C_3$ production rate of $1 \times 10^{25}$ molecules $\rm s^{-1}$ was derived. The dust color and dust activity were determined from the continuum light in the spectra. A neutral dust color was determined between 4070 Å and 4600 Å. The CN production rate and the Af ρ parameter, determined to $\rm (428.2 \pm 59.8)$ cm, were similar to the values of the 1982 perihelion passage, indicating that the comet's activity did not change significantly in recent orbital passages. A first crude estimate of the dust production rate indicates a high dust to gas mass ratio.
R-filter images taken in March 2003 were used to study the dust coma morphology. Two jet structures were seen in the coma; these structures show no variations within the observing period from March 7 to May 30, 2003. The orientation of these stationary structures suggests an inclination of the rotation axis of the nucleus of approximately $\rm 40^\circ$ with respect to the orbital plane.
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