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Object Saturn
Image type image
File size 127.0 KB
URL s2022-08-30_12-33_ir_tba.png
Observer Trevor Barry
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Comments: Imaged Saturn August 30th covering 2 hr 20 min of Saturn rotation in good seeing, the first 90 min were exceptional. As luck would have it the first 685nm IR run (9 min) has what I believe to be the long lived AV to the west of the CM, the next IR run was centered 32 min later with the AV just past the CM while the 3rd IR run centered a further 41 min later has the AV midway between the CM and P limb. These are very good data and the AV is resolved in these three IR runs. My capture regime most nights is 685nm IR ( 6 x 90s) followed by RGB (RRRR, GGGG, BBBB all 90s runs so 18 min) then this is repeated all of the session with a CH4 run (6 x 90s) to finish the night. The first two R channel runs for the first two RGB sets also resolve the AV but very faintly. I measure the AV to be at approx Lat+41.5 L3 196. The polar projection of the best 685nm IR well resolves the AV. There is considerable detail resolved in these data which I have measured and marked in the animations and insets. The AV gets lost in the animations of the data for the entire session so I have also done an animation using the three IR data sets which resolve the AV with only the AV marked. Detail I note covering all data. A bright spot in the NPR at approx Lat+62.7 L3 251.6 A bright spot in the NTrZ approx Lat+24.8 L3 199.3 A bright spot in the NTZ approx Lat+36.5 L3 236.9 The long lived AV approx Lat+41 L3 196 A large bright spot in the NEB approx Lat+20 L3 245.8 EZ / NRB ripple approx Lat+14.5 L1 191.6 R data bright spot on Southern edge of NNTeB approx Lat+46.6 L3 187 I have created an ephemeris for the AV based on this Aug 30th measurement but framed it from April through to December 2022. Note; have used a L3 drift of –0.0350 degrees / day. Have looked back though my data for AV but finding very good data where AV would have been visible is a problem, that said my July 25th data has what looks like the AV at the location predicted by the ephemeris.

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Observation 1
Feature(s) N/A
Filter(s) ir
Date 2022-08-30 12:33:00
Julian day 2459822.0229166667
System I 137.99837°
System II N/A
System III 183.87764°
Illumination 100.0%
Phase angle 1.600000023841858°
Solar longitude 28.4°
Eq. diameter 18.61″
Derotation 0.0 min