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Table A.6

Jet features in the coma of 41P.

Jet Time Date Jet Jet Jet Jet Jet Comments
Position to/from Start Axis Opening Max. Geometry Max.
Perihelion of Night PA Angle Intensity Extension
(days) (UT) (deg) (deg) (ratio) (km)
WJ −19.64 2017/03/23 291 7 1.05 s 4000 strong
WJ −18.84 2017/03/24 282 16 1.00 s 5000 marginal, PAC=295deg ?
WJ −16.95 2017/03/26 290 7 1.00 s 3000 weak
WJ −15.71 2017/03/27 305 10 1.00 s 5000 weak, PAC=290deg ?
WJ −14.79 2017/03/28 300 15 1.02 s 3000 clear
WJ −13.88 2017/03/29 303 21 1.10 s 6000 clear/strong

EJ −13.88 2017/03/29 31 18 1.20 mp 2000 strong

WJ −12.95 2017/03/30 310 18 1.15 s 3500 strong
WJ −9.73 2017/04/02 331 13 1.00 s 7000 weak

EJ −2.67 2017/04/09 86 11 1.05 mp 2000 clear
EJ −0.64 2017/04/11 86 14 1.05 mp 3000 clear
EJ 8.30 2017/04/20 73 29 1.15 mp 3000 clear, overlap with fan A

WJ 8.34 2017/04/20 5 18 1.20 s 6000 clear, overlap with fan A
WJ 11.36 2017/04/23 353 7 1.05 s 2500 clear
WJ 17.22 2017/04/29 2 21 1.20 mp 4000 strong
WJ 27.24 2017/05/09 357 16 1.20 s 3000 weak, overlap with fan A
WJ 31.10 2017/05/13 11 23 1.25 s 4000 strong, overlap with fan A

EJ 34.20 2017/05/16 68* 14 0.90 s 1500 clear
EJ 39.27 2017/05/21 126* 13 0.90 s 1500 weak
EJ 40.17 2017/05/22 127* 15 0.90 s 1000 weak
EJ 43.20 2017/05/25 110* nm nm nm nm weak, difficult to measure
EJ 47.13 2017/05/29 136 24 1.00 s 2000 clear/weak
EJ 51.21 2017/06/02 77 7 1.05 s 3000 clear

Notes. The table lists information of jets identified in the coma of the comet. The jets are seen outside of the region of coma Fan A, either east (“EJ” in column “Jet Position”) or west of the fan structure (“WJ” in column “Jet Position”). Further information given in the table is: Time to/from perihelion (days), start date of the observing night, position angle (PA, counted east over north) of the jet axis at 2000 km projected distance from the nucleus, jet opening angle, maximum intensity ratio seen in the jet compared to the mean flux of the coma at the respective radial distance from the coma center, jet geometry (s = straight, mp = small positive curvature, i.e. increasing PA with radial distance from the nucleus), maximum extension found in the processed images. The comment column provides additional information on the detectability of the jet structures (strong - very prominent, clear - well detectable, weak - weak detection, marginal - barely detectable) and on overlaps with Fan A. PAC means PA of the jet at the coma center (note: in the cases mentioned the jet is not traceable to the coma center since it overlaps with Fan A). Here, “nm” stands for not measurable. The uncertainty of the jet axis PA is 3 deg, that of the jet 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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