Table 1: Instrument filter setup and filter properties during the DI observations at ESO. The broadband filters are annotated following the standard photometry designation. Note that $R_{\rm special}$ is a modified R Bessell filter - see http://www.eso.org/instruments/fors1/ for further details. The names of the narrowband gas filters (CN, C₂, C₃, NH₂) refer to the respective gaseous species that emit light in the filter passband. Dust continuum filters are labeled BC for "blue continuum'' and RC for "red continuum'', a narrowband OII filter was used to measure the dust continuum in the UV. A special Na filter was installed for imaging of the comet in the wavelength range of the sodium D lines.
Observatory/ Light path Filter Central Band Max.

telescope/ name wavelength width transmission

instrument (nm) (nm) %

VLT/UT1/FORS2 parallel B 429 88.0 64.0

beam V 554 111.5 88.0

$R_{\rm special}$ 655 165.0 95.0

I 768 138.0 96.0

LSO/NTT/EMMI blue arm - OII 372.550 6.882 34.2

convergent CN 385.971 5.013 42.6

beam C₃ 405.229 7.538 58.8

red arm - BC 442.164 3.670 67.3

parallel C₂ 511.069 12.278 85.7

beam Na 589.347 2.300 59.2

NH₂ 662.543 3.455 85.2

RC 683.816 8.089 86.0

**Table 1:** Instrument filter setup and filter properties during the DI observations at ESO. The broadband filters are annotated following the standard photometry designation. Note that $R_{\rm special}$ is a modified R Bessell filter - see http://www.eso.org/instruments/fors1/ for further details. The names of the narrowband gas filters (CN, C₂, C₃, NH₂) refer to the respective gaseous species that emit light in the filter passband. Dust continuum filters are labeled BC for "blue continuum'' and RC for "red continuum'', a narrowband OII filter was used to measure the dust continuum in the UV. A special Na filter was installed for imaging of the comet in the wavelength range of the sodium D lines.
Observatory/	Light path	Filter	Central	Band	Max.
telescope/		name	wavelength	width	transmission
instrument			(nm)	(nm)	%
VLT/UT1/FORS2	parallel	B	429	88.0	64.0
	beam	V	554	111.5	88.0
		$R_{\rm special}$	655	165.0	95.0
		I	768	138.0	96.0
LSO/NTT/EMMI	blue arm -	OII	372.550	6.882	34.2
	convergent	CN	385.971	5.013	42.6
	beam	C₃	405.229	7.538	58.8
	red arm -	BC	442.164	3.670	67.3
	parallel	C₂	511.069	12.278	85.7
	beam	Na	589.347	2.300	59.2
		NH₂	662.543	3.455	85.2
		RC	683.816	8.089	86.0

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