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The Planetary Report
September Solstice 2019

From Our Member Magazine

Where We Are

An At-A-Glance Spacecraft Locator

We lost and gained spacecraft at the Moon last quarter. India’s Chandrayaan-2 left Earth orbit for the Moon on 13 August, and its Vikram lander aims at a 7 September touchdown. I’ve optimistically sited it on the ground on the diagram to the right. Lunar Reconnaissance Orbiter just celebrated its tenth launch anniversary. China’s smallsat Longjiang-2 crashed on 31 July, ending its successful mission.

Parker Solar Probe is racing away from perihelion number 3, which it passed on 1 September, and will fly by Venus for its second time on 26 December. The Spitzer Space Telescope, advancing ahead of Earth in its orbit, is nearing the end of its mission; it will be shut down on 30 January.

Asteroid Ryugu is near perihelion, which takes it closer to the Sun than Earth. The asteroid is too warm for Hayabusa2 to do any further touchdown activities. Late this quarter, Hayabusa2 will begin its journey home.

At Mars, it’s near northern summer solstice; the Mars Express Visual Monitoring Camera views of the planet show a fully lit northern polar cap. InSight’s engineers are still working to get the heat probe embedded in the sand. Seven years after landing, Curiosity saw its odometer turn over to 21 kilometers (16 miles) while crossing clay-rich rocks on Mount Sharp.

Storm on the Horizon

NASA / JPL-Caltech / SwRI / MSSS / Image processing by Kevin M. Gill

Storm on the Horizon
Juno captured this image during perijove 21 on 21 July 2019 at 04:37 UTC, from a distance of 42,965 kilometers above the planet's clouds at a latitude of 46 degrees south. This view highlights the contrast between the colorful South Equatorial Belt and the mostly white Southern Tropical Zone, a latitude that also features Jupiter’s most famous phenomenon, the persistent, anticyclonic storm known as the Great Red Spot.

At Jupiter, Juno has 2 close approaches to Jupiter on 3 November and 26 December. In the Kuiper belt, New Horizons is doing distant science on Kuiper belt objects, Uranus, and Neptune.

At a reader’s request, I’ve added numbers describing how far off the printed diagram Voyager 1 and 2 would actually be. It’s far!

Where We Are on 1 October 2019

Loren Roberts for The Planetary Society after a concept by Olaf Frohn

Where We Are on 1 October 2019
From the September Equinox 2019 issue of The Planetary Report.
LightSail 2 Mission Success

The Planetary Report • September Solstice 2019
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Emily Lakdawalla

Senior Editor and Planetary Evangelist for The Planetary Society
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