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SpaceX to Launch Twin NASA Water Cycle Tracker Satellites

The satellites are scheduled to launch at 3.47 p.m. EDT from Vandenberg Air Force Base in Central California

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NASA, Microsoft
After lettuce, astronauts could grow beans in space in 2021. Pixabay

On its way to deploy five Iridium Next communications satellites on Tuesday, a SpaceX Falcon 9 rocket will also launch twin NASA satellites that will monitor Earth’s water cycle, marking a unique rideshare arrangement.

The satellites are scheduled to launch at 3.47 p.m. EDT from Vandenberg Air Force Base in Central California. (This corresponds to 1.17 a.m. Wednesday India time), NASA said.

The two Gravity Recovery and Climate Experiment Follow-On mission (GRACE-FO) spacecraft will follow each other in orbit around Earth, separated by about 220 km.

On liftoff, the Falcon 9 first-stage engines will burn for approximately two minutes and 45 seconds before shutting down at main engine cutoff (MECO).

The Falcon 9’s first and second stages will separate seconds later. Then, the second-stage engine will ignite for the first time (SES1) and burn until the vehicle reaches the altitude of the injection orbit, 490 km.

NASA
Representational Image, VOA

While this burn is going on, the payload fairing — the launch vehicle’s nose cone — will separate into two halves like a clamshell and fall away.

When the rocket’s second stage has completed its ascent to the injection orbit altitude, it will pitch down (its nose points down) 30 degrees and roll so that one of the twin GRACE-FO satellites is facing down, toward Earth, and the other is facing up, toward space.

Then the second stage engine will cut off (SECO).

About 10 minutes after liftoff, a separation system on the second stage will deploy the GRACE-FO satellites.

Separation will occur over the Pacific Ocean at about 17.5 degrees North latitude, 122.6 degrees West longitude.

The first opportunity to receive data from the spacecraft will occur at NASA’s tracking station at McMurdo, Antarctica, about 23 minutes after separation, NASA said.

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After the GRACE-FO satellites are deployed, the Falcon 9 second stage will coast for half an orbit before reigniting its engine (SES2) to take the Iridium Next satellites to a higher orbit for deployment.

GRACE-FO, a collaborative mission of NASA and the German Research Centre for Geosciences (GFZ), continues the work of the original GRACE mission in observing the movement of water and other mass around our planet by tracking the changing pull of gravity very precisely. (IANS)

Next Story

NASA Names Mars Rock after The Band, The Rolling Stones

Slightly larger than a golf ball, the “Rolling Stones Rock” is said to have rolled about 3 feet (1 meter), spurred by the InSight spacecraft’s thrusters

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The "Rolling Stones Rock," slightly larger than a golf ball and named after the rock band, is seen on the surface of Mars after it rolled about 3 feet, spurred by the thrusters on NASA's InSight spacecraft, Nov. 26, 2018. VOA

The Rolling Stones have rocked stages around the world in their more than 50-year career. But now their influence has gone into space after NASA’s Mars InSight Mission named a rock on the planet after the band.

Slightly larger than a golf ball, the “Rolling Stones Rock” is said to have rolled about 3 feet (1 meter), spurred by the InSight spacecraft’s thrusters during touchdown on Mars in November, NASA said.

“In images taken by InSight the next day, several divots in the orange-red soil can be seen trailing Rolling Stones Rock,” it said. “It’s the farthest NASA has seen a rock roll while landing a spacecraft on another planet.”

Hollywood actor Robert Downey Jr. announced the name as Mick Jagger, Keith Richards, Ronnie Wood and Charlie Watts were about to perform Thursday night at Pasadena’s Rose Bowl Stadium, close to NASA’s Jet Propulsion Laboratory.

NASA, Mars, Rock
The Rolling Stones have rocked stages around the world in their more than 50-year career. Pixabay

The Rolling Stones, known for hits such as “Sympathy For The Devil” and “Brown Sugar,” called the honor “a milestone in our long and eventful history.”

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While the “Rolling Stones Rock” name is informal, it will feature on working maps of Mars, NASA said, but only the International Astronomical Union can give official scientific names for locations, asteroids and other objects in the solar system. (VOA)