By Philosophia-47 on 2018-05-26 UT
Here are two samples of the PJ13 images, labelled. One shows the impressive rifted regions in the NTB and NNTB; the other is the most complete view yet of the STB Spectre, confirming that is intact despite the turbulence that buffetted it recently. These are from the ‘version 1’ images posted by the JunoCam team; the full-resolution versions posted by Gerald on the JunoCam web site show mind-boggling detail.
- FB-Fig_PJ13C00028_V01_STBSpectre&SSTB.jpg 
- FB-Fig_PJ13C00041_V01_STBSpectre&SSTB.jpg [484.19 kB]
Bjorn, thanks for your comment on that shadow-like feature. I think you may be right. In fact, after enhancing the contrast on your illustration, there seems to be a more plausible shadow right next to the central, brightest part of the 'cloud ridge, of similar width to other cloud shadows in the image, but the much larger shadow-like feature extending to the right is not quite so dark. Perhaps it is an albedo feature or an area of thinner cloud, like the dark lane you refer to. --John.
Here are links to the maps, John's composit maps are based on:
Excellent report as usual. The shadow-like feature in PJ13_27 also immediately caught my attention when I first saw it in enhanced images and I assumed it to be a shadow. However, after close inspection I don't think it's a shadow. The 'shadow' is the same color as the dark 'lane' that extends towards the upper left from the bright cloud casting the 'shadow'. Also the 'shadow' extends slightly farther down than the bright cloud. Last but not least the sun is ~40 degrees above the horizon at this location; this area isn't as dark relative to areas farther west as enhanced images suggest. I'd love to be wrong though because I really want this feature to be a huge shadow!
I'm including an approximately true color/contrast annotated, enlarged image of this area to illustrate the points above.
Here is a map of the south polar hazes. Like the south polar albedo map included as Figure 11 of my report, it is a composite from Gerald's south polar projection maps, but selecting the terminator regions rather than the full-sun regions. I haven't had time to annotate it yet, but here is the summary of it from the report:
Many minor haze bands are visible, but notably, the ‘Long Band’ is almost entirely absent, for the first time since PJ4. There are some intensely bright and dark arcs of haze, spanning the belt of FFRs at ~67-71ºS, but they are well north of the usual position of the Long Band.
Here is a ZIP file with the full-size figures from my PJ13 report. --John.
Here is a report on the PJ13 JunoCam images.
(It has also been posted on the BAA Jupiter Section web site at:)
Highlights included impressive rifted regions in the NNTB and NTB, a white oval and barge in the NEB, and the STB Spectre, as well as glorious expanses of turbulence in the high latitudes. Merged maps of the north and south polar regions are included.
The report is in the attached PDF file, and the full-size figures are in a ZIP file to be attached to the next comment.