Subaru Telescope Extends Juno Spacecraft Discoveries

These latest observations supplement others earlier this year in providing information about atmospheric dynamics at different depths at the Great Red Spot and other regions of Jupiter.

The Great Red Spot is a swirling storm, centuries old and wider than the diameter of Earth. Juno will use multiple instruments to study this feature when it flies over it about 12 minutes after the spacecraft makes the closest approach to Jupiter of its current orbit at 6:55 p.m. on July 10, PDT (9:55 p.m. on July 10, EDT; 1:55 a.m. on July 11, Universal Time). Juno entered orbit around Jupiter on July 4, 2016.

 

“Observations with Earth’s most powerful telescopes enhance the spacecraft’s planned observations by providing three types of additional context,” said Juno science team member Glenn Orton of NASA’s Jet Propulsion Laboratory, Pasadena, California. “We get spatial context from seeing the whole planet. We extend and fill in our temporal context from seeing features over a span of time. And we supplement with wavelengths not available from Juno. The combination of Earth-based and spacecraft observations is a powerful one-two punch in exploring Jupiter.”

Orton collaborated with researchers at Gemini; Subaru; the University of California, Berkeley; Tohoku University, Japan; and elsewhere in planning the recent observations.

The observers used Gemini North on May 18 to examine Jupiter through special near-infrared filters. The filters exploit specific colors of light that can penetrate the upper atmosphere and clouds of Jupiter, revealing mixtures of methane and hydrogen in the planet’s atmosphere. These observations showed a long, fine-structured wave extending off the eastern side of the Great Red Spot.

On the same night, researchers used Subaru’s Cooled Mid-Infrared Camera and Spectrometer (COMICS), with filters sensitive to temperatures at different layers of Jupiter’s atmosphere. These mid-infrared observations showed the Great Red Spot “had a cold and cloudy interior increasing toward its center, with a periphery that was warmer and clearer,” Orton said. “A region to its northwest was unusually turbulent and chaotic, with bands that were cold and cloudy, alternating with bands that were warm and clear.”

Contacts and sources:
Yuko Kakazu, National Astronomical Observatory of Japan’s Subaru Telescope
DC Agle / Guy Webster, Jet Propulsion Laboratory, Pasadena, Calif.
Deb Schmid, Southwest Research Institute, San Antonio