JPSS-1 (NOAA-20) – Delta II 7920-10C – Vandenberg SLC-2W – 18.11.2017

[tnt22]

ULA‏Подлинная учетная запись @ulalaunch 7 мин. назад

The launch team has been polled and all stations are ready for the countdown to #DeltaII tonight from California.

[tnt22]

ULA‏Подлинная учетная запись @ulalaunch 7 мин. назад

Clocks are ticking to begin the 3-hour countdown for launch of the Delta II rocket from Vandenberg Air Force Base in California with #JPSS1 at 1:47 a.m. PST (4:47 a.m. EST; 0947 UTC).

[tnt22]

11/18/2017 09:50

During the three-hour countdown sequence, ULA's launch team will switch on the Delta 2's guidance computer, pressurize helium and nitrogen tanks aboard the rocket, load liquid propellant into the rocket, test the booster's flight termination system and conduct steering checks on the first and second stage engines.

Two more built-in holds are planned in the countdown at T-minus 15 minutes and T-minus 4 minutes, first for 20 minutes and then for 10 minutes. After a final poll of the launch team, the terminal countdown will resume at T-minus 4 minutes and continue until liftoff.

[tnt22]

ULA‏Подлинная учетная запись @ulalaunch 3 мин. назад

Fueling operations have kicked off in the countdown to fill the Delta II rocket's first stage with 10,000 gallons of highly refined kerosene propellant

[tnt22]

ULA‏Подлинная учетная запись @ulalaunch 43 сек. назад

The 20-minute task to load the Delta II rocket's first stage RP-1 fiel tank has been completed as the countdown proceeds smoothly for tonight's launch at 1:47 a.m. PST (4:47 a.m. EST; 0947 UTC).

[tnt22]

NASA_LSP‏Подлинная учетная запись @NASA_LSP 3 мин. назад

Meet the NASA LSP team members for today's #DeltaII #JPSS1 launch. LSP engineers are on console from launch centers in CA, CO, and FL, working the 3rd launch attempt this week. Our Launch Manager held NASA Countdown Initiation Readiness Poll an hour ago https://www.nasa.gov/content/jpss-1-launch-team ...

[tnt22]

Tory Bruno‏Подлинная учетная запись @torybruno 50 сек. назад

The first baloon is green. #JPSS1

[tnt22]

NASA_LSP‏Подлинная учетная запись @NASA_LSP 2 мин. назад

The NASA engineering team is GO for NASA Cryo Load Readiness Poll. The NASA Chief Engineer will report to the NASA Launch Manager's poll. #DeltaII #JPSS1

[tnt22]

11/18/2017 10:45

The current weather conditions at Space Launch Complex 2-West are observed "green," and are forecast to remain acceptable for launch throughout the countdown. There is a 0 percent chance of violating the Delta 2's launch weather constraints.

The outlook for launch time calls for clear skies, winds from the east at 7 to 10 knots, and a temperature in the low 40s Fahrenheit.

[tnt22]

11/18/2017 10:48

Activation of the Delta 2's guidance system is complete.

[tnt22]

Tory Bruno‏Подлинная учетная запись @torybruno 45 сек. назад

Polling good for Cryogenic OPs #JPSS1

[tnt22]

NASA_LSP‏Подлинная учетная запись @NASA_LSP 3 мин. назад

Winds are currently GREEN for #JPSS1 #DeltaII launch! Launch team will continue to monitor the @upperlevelwinds via multiple high altitude balloons released in the hours prior to launch along with other weather criteria. https://earthobservatory.nasa.gov/blogs/fromthefield/2013/02/26/launching-101-first-weather-balloons-then-rockets/ ...

[tnt22]

11/18/2017 10:57

The launch team is "go" to begin filling the first stage with cryogenic liquid oxygen.

[tnt22]

11/18/2017 11:03

The Delta 2's first stage is now being loaded with cryogenic liquid oxygen chilled to minus 298 degrees Fahrenheit. The super-cold oxidizer is flowing from a 28,000-gallon storage tank at Space Launch Complex 2 into the Delta 2 rocket through plumbing at the base of the first stage.

The first stage's Aerojet Rocketdyne RS-27A main engine will consume the liquid oxygen with the RP-1 kerosene already pumped into the vehicle.

[tnt22]

Tory Bruno‏Подлинная учетная запись @torybruno 4 мин. назад

9 minutes into LOX loading. All is green

[tnt22]

Tory Bruno‏Подлинная учетная запись @torybruno 3 мин. назад

Weather still showing green. Wayward Board in the neighborhood, but heading off the range. No issues at this time.

[tnt22]

NASA_LSP‏Подлинная учетная запись @NASA_LSP 1 мин. назад

We are L-1 hour, 30 minutes (T-1 hour) from today's #DeltaII launch of @NOAASatellites #JPSS1 L-Time is real time to launch T-Time is used for the sequence of events & can move around in real time during the countdown

[tnt22]

11/18/2017 11:28

The liquid oxygen tank on the Delta 2 rocket's first stage is now full. Liquid oxygen will continue flowing into the tank throughout the countdown to replace the super-cold oxidizer as it naturally boils away. The liquid oxygen loading operation in today's countdown took 25 minutes, 17 seconds.

With the completion of liquid oxygen tanking, the Delta 2 rocket now stands fully fueled for launch with the JPSS 1 weather satellite at 1:47 a.m. PST (4:47 a.m. EST; 0947 GMT) from Vandenberg Air Force Base, California. RP-1 fuel was loaded into the first stage earlier in the countdown, and the second stage received its blend of Aerozine 50 and nitrogen tetroxide hypergolic propellants earlier in the launch campaign. The nine solid rocket boosters came with their propellants pre-packed.

[tnt22]

ULA‏Подлинная учетная запись @ulalaunch 3 мин. назад

The half-million-pound Delta II rocket now stands fully fueled for its mission to launch the #JPSS1 polar-orbiting weather observatory at 1:47 a.m. PST (4:47 a.m. EST; 0947 UTC).

[tnt22]

L-1 час