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Table A.3

Estimated and absolute nucleus brightness (m(r,Δ,φ) and H(1, 1, 0)), equivalent radius (R), and gradient of the near-nucleus coma of comet 41P.

Time Inst. SDSS r SDSS i SDSS g
to/from Coma Nucleus Nucleus Nucleus Coma Nucleus Nucleus Nucleus Coma Nucleus Nucleus Nucleus
Perihelion Gradient Estimated Absolute Equivalent Gradient Estimated Absolute Equivalent Gradient Estimated Absolute Equivalent
(days) Brightness Brightness Radius Brightness Brightness Radius Brightness Brightness Radius
(mag) (mag) (km) (mag) (mag) (km) (mag) (mag) (km)
−31.71 3KK 1.00 15.7 18.2 0.72 1.02 15.5 18.0 0.78
−30.90 3KK 0.90 15.4 17.9 0.82 0.91 15.1 17.6 0.93
−19.64 3KK 0.98 16.3 18.7 0.56 1.00 16.2 18.6 0.57
−18.84 3KK 0.99 17.4 19.8 0.34 1.03 17.1 19.5 0.38
−17.97 3KK 1.04 17.1 19.5 0.39 1.11 18.0 20.4 0.25
−16.95 3KK 0.99 16.1 18.5 0.62 1.05 16.0 18.4 0.64
−15.71 3KK 1.03 ne ne ne 1.00 ne ne ne
−14.79 3KK 0.97 16.2 18.5 0.61 1.02 16.1 18.4 0.63
−13.88 3KK 0.87 15.6 17.9 0.81 0.93 15.4 17.7 0.87
−12.95 3KK 0.86 16.7 19.0 0.49 0.89 16.7 19.0 0.48
−9.73 3KK 0.92 17.9 20.1 0.29 0.97 17.8 20.0 0.30
−3.61 3KK 0.93 16.6 18.6 0.58 0.98 16.6 18.6 0.57
−2.67 3KK 0.83 16.3 18.3 0.68 0.90 16.2 18.2 0.70
−2.61 WWFI 0.85 16.2 18.2 0.71
−0.64 3KK 0.93 17.4 19.3 0.42 1.00 17.6 19.5 0.38
−0.61 WWFI 0.96 17.4 19.3 0.42
8.30 WWFI 0.88 16.8 18.5 0.62
8.34 3KK 0.90 16.8 18.5 0.62 0.94 16.7 18.4 0.64
11.36 WWFI 0.88 16.6 18.2 0.70
12.22 3KK 0.93 17.3 18.9 0.51 1.00 ne ne ne
17.22 WWFI 0.87 16.6 18.1 0.74
18.22 WWFI 0.90 ne ne ne 0.90 ne ne ne 0.75 ne ne ne
23.26 3KK 0.83 16.4 17.8 0.84 0.89 16.5 17.9 0.80
27.24 3KK 0.83 17.5 18.9 0.52 0.89 17.3 18.7 0.56
27.28 WWFI 0.85 17.4 18.8 0.55
28.33 WWFI 0.98 ne ne ne
31.10 3KK 0.90 16.9 18.2 0.70 0.94 16.9 18.2 0.69
31.26 WWFI 0.95 17.2 18.5 0.60
34.20 WWFI 0.90 16.9 18.2 0.71
36.14 3KK 0.89 17.0 18.3 0.69 0.94 17.1 18.4 0.65
36.23 WWFI 0.90 ne ne ne 0.98 ne ne ne 0.82 ne ne ne
39.27 WWFI 0.96 17.4 18.6 0.58 1.00 17.3 18.5 0.60 0.82 17.1 18.3 0.77
40.17 WWFI 0.93 18.7 19.9 0.32 0.97 18.8 20.0 0.30 0.82 18.2 19.4 0.47
43.20 WWFI 1.07 ne ne ne 1.14 ne ne ne 0.93 ne ne ne
47.13 WWFI 0.97 16.9 18.0 0.76 1.02 16.8 17.9 0.78 0.85 16.9 18.0 0.88
51.21 WWFI 1.01 ne ne ne 1.07 ne ne ne 0.92 18.9 20.0 0.36
52.22 WWFI 1.03 ne ne ne
53.26 WWFI 0.82 18.6 19.7 0.36
54.21 WWFI 0.96 ne ne ne
57.14 WWFI 0.93 19.3 20.3 0.27
58.27 WWFI 0.90 18.6 19.6 0.38
62.21 WWFI 1.00 ne ne ne
63.27 WWFI 0.90 17.5 18.4 0.65
70.19 WWFI 0.93 19.0 19.7 0.35
72.29 WWFI 0.91 18.4 19.0 0.49
76.16 WWFI 0.97 19.3 19.8 0.34
82.27 WWFI 0.90 19.2 19.4 0.41
92.16 WWFI 0.86 19.2 18.9 0.51
95.20 WWFI 0.92 19.5 19.0 0.48

Notes. The date is given in days to/from perihelion. The table also includes the instrument and filter names. Here, “ne” stands for not estimated. The uncertainty in the nucleus brightness estimations is about 0.2 mag for apparent magnitudes of 17–18 mag or brighter, and is 0.3 mag for fainter flux levels of the nucleus. The uncertainty of the exponent of the radial flux profile in the inner coma is typically better than 0.02. The images obtained on epochs −32.73 days (2017 March 11) and 96.14 days (2017 July 17) did not allow useful results to be derived.

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