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The launch team's strategy, according to NASA Launch Manager Tim Dunn, is to continue down to the L-4 minute mark. If the hydraulic pump is not functioning property at that point, the team will not continue the countdown. Although there are some new storm cells that could begin affecting the flight path in the next …

The Stargazer L-1011 is flying west now in its racetrack pattern in order to set up for a second launch attempt at 9:05 a.m. EST. Meanwhile, the team continues troubleshooting a problem with the hydraulic system that controls the release of the Pegasus XL rocket from the aircraft.

Should a second launch attempt be approved for today, the drop time would be 9:05 a.m. EST for release and launch of the Pegasus XL rocket carrying NASA's CYGNSS spacecraft.

Due to a hydraulic pump problem aboard the L-1011 Stargazer aircraft and weather concerns at the drop point, the 8:40 a.m. launch attempt will be bypassed and the team will determine whether a second attempt is possible during today's launch window. Pilots aboard the aircraft have been directed to recycle for a possible second attempt.

The L-1011 "Stargazer" aircraft carrying the Pegasus XL rocket continues its climb as it flies through a "racetrack pattern" that will ultimately put the vehicle on the path to the drop point. Launch remains scheduled for 8:40 a.m. EST.

The L-1011 aircraft with the Pegasus XL rocket mounted beneath are clearly visible in this image taken from the chase plane. Credit: NASA TV In this image taken by a camera mounted to the underside of the L-1011 aircraft, the F-18 chase plane is visible below the Pegasus XL rocket. Credit: NASA TV

Launch Weather Officer Mike Rehbein reports the range currently is "no go" due to violation of the anvil cloud constraint. However, he expects that to clear within ten minutes of the 8:40 a.m. EST launch time, so the Stargazer will continue on its planned flight path for now.

The NASA F-18 Hornet chase plane has departed from the Skid Strip at Cape Canaveral Air Force Station in Florida. Video provided by the chase plane will capture the deployment and first few minutes of the Pegasus XL rocket's flight.

The Orbital ATK "Stargazer" L-1011 aircraft has taken off from the Skid Strip at Cape Canaveral Air Force Station in Florida. Attached to its underside is the company's Pegasus XL rocket containing the eight CYGNSS microsatellites. Launch remains scheduled for 8:40 a.m. EST. From now until then, the crew aboard the L-1011 will work through …