The spectru is taken with a LISA spectrograh (35 microns slit, 5 x 600 sec. exposure + some clouds).
Here during guiding:
Here the spectrum profile after sun signature removed (division by a
solar like spectrum star):
Dust dominate, but CN ultraviolet line is intense.
See also
http://www.astrosurf.com/buil/comet/her ... er/obs.htm
A fine target for northern observers
Christian B