Perijove 23 (PJ23), on 2019 Nov.3, was the first since Juno ‘jumped over’ Jupiter’s shadow, so the sub-spacecraft track was close to local mid-day, and at low latitudes the camera was scanning the horizon. Nevertheless, with its wide field of view, JunoCam was able to image all of the track at oblique angles, and as it crossed the equator it obtained a 360-degree view of the horizon with Io poised above it. Close-ups of the SEB showed a large cyclonic ‘white barge’, an unexpected anticyclonic white spot, and the wave-train on the SEB south edge. Both ends of the cyclonic ‘STB Spectre’ were clearly seen, despite its visual obscurity; it now spans 120 longitude. The attached report describes these and other features, but not the polar regions, which will be covered later in Part II.
All these perijove reports are also posted on our BAA Jupiter Section web pages at: https://www.britastro.org/section_front/15
- Report-on-PJ23_PartI.pdf [1.18 MB]