NASA's twin satellites that will monitor Earth's water cycle are scheduled to launch from Vandenberg Air Force Base in Central California today, May 22, in a unique ride-share arrangement. The two Gravity Recovery and Climate Experiment Follow-On mission (GRACE-FO) spacecraft will join five Iridium NEXT communications satellites as the payload on a SpaceX Falcon 9 rocket.
GRACE-FO will join five Iridium NEXT communications satellites as the payload on a SpaceX Falcon 9 rocket.
SpaceX via YouTube
Liftoff from Vandenberg's Space Launch Complex 4E is targeted for 12:47 p.m. PDT (3:47 p.m. EDT). On liftoff, the Falcon 9 first-stage engines will burn for approximately 2 minutes and 45 seconds before shutting down at main engine cutoff. 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 kilometres).
injection orbit, 305 miles (490
injection orbit, 305 miles (490
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 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.
About 10 minutes after liftoff, a separation system on the second stage will deploy the GRACE-FO satellites. The 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. 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.
The Falcon 9 rocket carrying the GRACE-FO twin satellites was raised into the vertical launch position this evening at Space Launch Complex 4E, Vandenberg Air Force Base, California.
Image credits: NASA/Bill Ingalls
For those unaware, 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.
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