Left: same as Fig. 1 for UT 01:28 September 23. Right: a 50-min spectral image starting at UT 00:54 September 23. The comet was 3.32 AU from the Sun and the distance to the center of the nucleus was 28.5 km. The solar phase angle was 76.1°. One spatial row of the spectral image projects to 150 m.
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