Table 2: RSS, SWS and NL parameters. No.: serial number of the observation. PA $_{\rm RSS}$ : measured position angle on the sky of the average orientation of the RSS. PA $_{\rm SWS}$ : measured position angle on the sky of the SWS. PA $_{\rm RV}$ : computed position angle on the sky of the Sun-comet radius vector. PA $_{\rm +V}$ : computed position angle on the sky of the positive velocity vector. NLp: NL point sequential number (Fig. 1). (1 $-\mu$ ): radiation pressure acting on the dust grain. $\tau$ : days elapsed between ejection of the dust grain from the comet nucleus and observation. d $[^{\circ }]$ , d [10⁶ km]: angular (in the plane of the sky) and linear (in the plane of the comet orbit) distance from the nucleus of the computed NL point, respectively. PA $_{\rm NL}$ : position angle of the sky-projected NL point. oPA $_{\rm NL}$ : orbital position angle of the NL point. Position angles in the plane of the sky are measured from north to east, as usual, whereas the ones in the plane of the comet orbit (prefix o) are measured counterclockwise from the Sun-comet prolonged radius vector (r').
No. PA $_{\rm RSS}$ [ $^{\circ}$ ] PA $_{\rm SWS}$ [ $^{\circ}$ ] PA $_{\rm RV}$ [ $^{\circ}$ ] PA $_{\rm +V}$ [ $^{\circ}$ ] NLp (1 $-\mu$ ) $\tau$ [days] $d~[^{\circ}]$ PA $_{\rm NL}$ [ $^{\circ}$ ] d[10⁶ km] oPA $_{\rm NL}$ [ $^{\circ}$ ]

1 299.9 122.5 125.01 307.61 1 0.01 17.87 0.259 300.23 1.385 280.97

2 0.02 17.99 0.510 300.09 2.775 280.11

3 0.03 18.12 0.753 299.94 4.172 279.24

4 0.04 18.26 0.986 299.79 5.573 278.36

5 0.05 18.39 1.210 299.62 6.981 277.47

2 303.3 123.6 124.41 305.17 1 0.001 19.35 0.035 303.33 0.158 283.84

2 0.002 19.36 0.069 303.33 0.316 283.76

3 0.003 19.37 0.103 303.32 0.475 283.67

4 0.004 19.38 0.138 303.32 0.633 283.58

5 0.005 19.39 0.172 303.32 0.791 283.50

6 0.006 19.40 0.206 303.32 0.949 283.41

7 0.007 19.41 0.240 303.31 1.108 283.32

3 306.7 125.0 122.37 298.17 1 0.001 23.62 0.052 306.68 0.210 287.86

2 0.002 23.63 0.104 306.68 0.420 287.77

3 0.003 23.64 0.156 306.69 0.630 287.68

4 0.004 23.65 0.208 306.70 0.840 287.60

**Table 2:** RSS, SWS and NL parameters. No.: serial number of the observation. PA $_{\rm RSS}$ : measured position angle on the sky of the average orientation of the RSS. PA $_{\rm SWS}$ : measured position angle on the sky of the SWS. PA $_{\rm RV}$ : computed position angle on the sky of the Sun-comet radius vector. PA $_{\rm +V}$ : computed position angle on the sky of the positive velocity vector. NLp: NL point sequential number (Fig. 1). (1 $-\mu$ ): radiation pressure acting on the dust grain. $\tau$ : days elapsed between ejection of the dust grain from the comet nucleus and observation. d $[^{\circ }]$ , d [10⁶ km]: angular (in the plane of the sky) and linear (in the plane of the comet orbit) distance from the nucleus of the computed NL point, respectively. PA $_{\rm NL}$ : position angle of the sky-projected NL point. oPA $_{\rm NL}$ : orbital position angle of the NL point. Position angles in the plane of the sky are measured from north to east, as usual, whereas the ones in the plane of the comet orbit (prefix o) are measured counterclockwise from the Sun-comet prolonged radius vector (r').
No.	PA $_{\rm RSS}$ [ $^{\circ}$ ]	PA $_{\rm SWS}$ [ $^{\circ}$ ]	PA $_{\rm RV}$ [ $^{\circ}$ ]	PA $_{\rm +V}$ [ $^{\circ}$ ]	NLp	(1 $-\mu$ )	$\tau$ [days]	$d~[^{\circ}]$	PA $_{\rm NL}$ [ $^{\circ}$ ]	d[10⁶ km]	oPA $_{\rm NL}$ [ $^{\circ}$ ]
1	299.9	122.5	125.01	307.61	1	0.01	17.87	0.259	300.23	1.385	280.97
					2	0.02	17.99	0.510	300.09	2.775	280.11
					3	0.03	18.12	0.753	299.94	4.172	279.24
					4	0.04	18.26	0.986	299.79	5.573	278.36
					5	0.05	18.39	1.210	299.62	6.981	277.47
2	303.3	123.6	124.41	305.17	1	0.001	19.35	0.035	303.33	0.158	283.84
					2	0.002	19.36	0.069	303.33	0.316	283.76
					3	0.003	19.37	0.103	303.32	0.475	283.67
					4	0.004	19.38	0.138	303.32	0.633	283.58
					5	0.005	19.39	0.172	303.32	0.791	283.50
					6	0.006	19.40	0.206	303.32	0.949	283.41
					7	0.007	19.41	0.240	303.31	1.108	283.32
3	306.7	125.0	122.37	298.17	1	0.001	23.62	0.052	306.68	0.210	287.86
					2	0.002	23.63	0.104	306.68	0.420	287.77
					3	0.003	23.64	0.156	306.69	0.630	287.68
					4	0.004	23.65	0.208	306.70	0.840	287.60

Source LaTeX | All tables | In the text

	1 Introduction
	2 Observations and reduction procedure
	3 Discussion and conclusion
	References