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Table A.5

Morphologic information on Fan A in the coma of comet 41P.

Time Fan A Fan A Fan A Fan A Fan A Fan A Fan A Fan A Fan A
to/from PA PA PA PA PA Opening Curva- Inten- Exten-
Perihelion Aeast Awest Aeast Awest Abright Angle ture sity sion
obs obs sim sim obs obs obs obs obs
(days) (deg) (deg) (deg) (deg) (deg) (deg) (km)
−31.71 −24 −70 −20 −66 −30 46 nm nm nm
−30.90 −34 −74 −20 −66 −27 40 nm nm nm
−19.64 −18 −73 −2 −63 −35 55 s 1.2 5000
−18.84 −13 −73 0 −63 −34 60 s 1.2 5000
−17.97 −4 −62 3 −56 −19 58 s 1.25 4000
−16.95 2 −54 5 −55 −18 56 s 1.3 5000
−15.71 6 −50 7 −55 −23 56 s 1.25 5000
−14.79 6 −51 10 −55 −9 57 s 1.3 4000
−13.88 3 −50 12 −55 −32 53 s 1.25 2500
−12.95 10 −38 15 −55 −16 48 s 1.3 5000
−9.73 27 −33 25 −30 −3 60 s 1.3 6000
−3.61 46 −15 44 −14 11 61 s 1.3 5000
−2.67 45 −11 48 −11 25 56 s 1.3 6000
−2.61 49 −10 48 −11 11 59 s 1.25 5000
−0.64 59 −8 50 −7 15 67 s 1.3 5000
−0.61 65 −4 50 −7 35 69 s 1.3 3000
8.30 64 2 59 −2 37 62 s 1.15 7500
8.34 64 0 59 −2 53 64 s 1.25 7500
11.36 60 2 61 −2 44 58 s 1.25 6000
12.22 65 3 61 −2 36 62 s 1.3 3000
17.22 60 0 63 −3 43 60 s 1.2 6000
18.22 64 2 63 −3 39 62 s 1.2 5000
23.26 66 −3 65 −6 35 69 s 1.3 5000
27.24 56 −5 65 −7 31 61 s 1.25 4000
27.28 60 −7 65 −7 31 67 s 1.25 6000
28.33 71 4 67 −7 33 67 s 1.25 6000
31.10 62 −4 67 −7 35 66 s 1.25 6000
34.20 60 −7 70 −9 14 67 s 1.25 6500
36.14 61 −8 69 −12 39 69 s 1.3 5000
36.23 68 −7 69 −12 23 75 s 1.3 6000
39.27 60 −12 69 −11 19 72 s 1.3 8000
40.17 56 −15 68 −11 16 71 s 1.3 6000
43.20 60 −12 69 −12 23 72 s 1.3 7000
47.13 64 −10 70 −13 26 74 s 1.2 6500
51.21 71 −4 70 −13 30 75 s 1.2 5000
52.22 75 −3 70 −13 19 78 s nm 3000
53.26 62 −12 70 −14 14 74 s nm 3000
54.21 73 −12 71 −14 18 85 s 1.25 3000
57.14 70 −11 71 −14 15 81 s 1.2 3500
58.27 69 −12 72 −15 27 81 s 1.2 3000
62.21 68 −14 73 −15 20 82 s 1.25 4000
63.27 66 −22 73 −15 5 88 s 1.2 3000
72.29 61 −25 74 −15 5 86 s 1.1 3000
76.16 71 −23 77 −15 nm 94 s 1.1 3500
82.27 72 −38 80 −15 nm 110 s 1.1 2000

Notes. The information is obtained from SDSS r filter images of the comet. The table lists for the various observing epochs (in days to/from perihelion): The position angle (PA, counted east over north) with respect to the nucleus of the eastern (‘Aeast’) and western (‘Awest’) edge of the fan cone, measured at 2000 km projected distance in the coma for an intensity ratio 5% above the mean coma brightness at this distance; the position angles of ‘Aeast’ and ‘Awest’ obtained from the dust coma simulations applying the best-matching rotation axis and fan location information as mentioned in the text; the position angle of the brightest part (Abright) in the fan close to the nucleus (typically at a few 100 km projected distance); the opening angle of the fan cone; the curvature of the fan (s = straight without curvature); the maximum intensity ratio with respect to the mean local coma level versus distance from the nucleus; the maximum extension at which the fan was still detected in the analyzed images. Results from observational data are indicated under column label “obs”, those from simulations under column label “sim”. String “nm” indicates properties that could not be properly measured in the images of the comet. Fan PAs for 2017 March 11 (−32.73 days), 2017 June 21 (70.19 days), 2017 July 13 (92.16 days), 2017 July 16 (95.20 days), 2017 July 17 (96.14 days) could not be measured. The fan PAs for the WWFI observations on 2017 May 14 (31.26 days) are compatible with the ones listed under epoch 31.10 days in the table above. The uncertainty of the measured PAs is 3 deg, that of the opening angle is 4 deg, that of the maximum intensity is 0.03, and that of the maximum extension is smaller than 500 km.

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