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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