Ganymede Observations by JunoCam on Juno Perijove 34. Issue 23 (12th December 2022)

• Record Type: Journal Article
• Authors: Ravine, M. A.; Hansen, C. J.; Collins, G. C.; Schenk, P. M.; Caplinger, M. A.; Lipkaman Vittling, L.; Krysak, D. J.; Zimdar, R. P.; Garvin, J. B.; Bolton, S. J.
• Is Part Of: Geophysical research letters. Volume 49:Issue 23(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-12-12
• Subjects: Ganymede -- Juno -- JunoCam -- geology -- topography; Geophysics -- Periodicals; Planets -- Periodicals; Lunar geology -- Periodicals; 550
• DOI: 10.1029/2022GL099211
• Languages: English
• ISSNs: 0094-8276

Abstract

Abstract: During the Juno Mission's encounter with Ganymede on 7 June 2021, the Juno camera (JunoCam) acquired four images of Ganymede in color. These images covered one‐sixth of Ganymede at scales from 840 m to ∼4 km/pixel. Most of this area was only previously imaged by Voyager 1 in 1979, at lower spatial resolution and poorer image quality. No changes were observed over this area of Ganymede in the 42 years since Voyager. JunoCam provided overlapping coverage, from which we developed a digital elevation model of the best‐resolved area. A 3 km high dome at the subjovian point was confirmed, 450 km by 750 km. We used the JunoCam images to refine the geologic map of Ganymede in eastern Perrine Regio. Plain Language Summary: Juno flew by Jupiter's moon Ganymede on 7 June 2021, taking four color images. They covered about one‐sixth of Ganymede at a scale as small as 840 m/pixel, an improvement over the previous coverage from Voyager 1 in 1979. No changes were seen. Features were seen not previously recognized, including 10 possible cryovolcanoes. Topography of several features was derived from stereo coverage, including a 3 km high dome at the subjovian point, confirming observations made from Voyager. Key Points: In 2021, Juno camera (JunoCam) acquired close‐up images of Ganymede, providing improved spatial resolution relative to the 1979 Voyager 1 coverage While no changes were observed in the 42 years since Voyager, previously unrecognized paterae and craters were identified Topography derived from JunoCam confirmed a 3 km high dome at Ganymede's subjovian point and showed it to be elliptical in planform