Visibility III / V
67P / Churyumov-Gerasimenko presents his handsome almost 20 'long tail here, even though he is only a mag10 comet. 67P / CG is relatively close at a distance of 0.44au from Earth so Koma’s morphology is also starting to show. Figure 2 shows a 50 minute exposure with a narrow band cyan radical gas CN 3883Å filter treated with CometCIEF. It distinguishes two jets both in the direction of the normal tail PA 290 ° and also in the curved forward outgoing jet in the direction PA 110 °.
Picture 1) 20x60s, L / Clear filter, 2021-10-17 02: 30UT, FoV 28'x18 '
Figure 2) 10x300s, narrowband 387nm / 15nm filter, CometCIEF processed, 2021-10-17 01: 38UT, FoV 6'x6 '
Figure 3) Same as Figure 2, but no CometCIEF processing, 10x300s, narrowband 387nm / 15nm filter, 2021-10-17 01: 38UT, FoV 12'x12 '
Figure / Animation 4) 4 frames each 10x300s, narrowband 387nm / 15nm filter, CometCIEF processed, start 2021-10-16 23: 04UT --- end 2021-10-17 02: 30UT, FoV 8'x8 '