It Takes a Nation to #LaunchAmerica!

Image Credit: NASA/RoscosmosAs we celebrate 20 years of humans living and working on the International Space Station, we’re also getting ready for another space milestone: Crew-1, this weekend’s trip to the ISS aboard the SpaceX Crew Dragon Resilience and the first certified crew rotation flight to the International Space Station.Crew-1 is scheduled to lift off Saturday at 7:49 PM EST, from our Kennedy Space Center—but across the United States, teams from NASA and SpaceX will be hard at work sending our astronauts into orbit!Image Credit: NASA/Fred DeatonAt Marshall Space Flight Center’s Huntsville Operations Support Center (HOSC), for example, engineers with our Commercial Crew Program have been helping review the design and oversee safety standards for SpaceX’s Falcon 9 rocket, making sure it’s ready to carry humans to the Space Station.This Saturday, they’ll be in the HOSC to monitor launch conditions and watch the data as Crew-1 blasts off, helping future commercially-operated missions to the ISS run even more smoothly.Image Credit: NASA/Emmett GivenLong before Crew-1, though, Marshall has been keeping things active on board the ISS. For decades, the Payload Operations and Integration Center, also located in the HOSC, has been “science central” for the Space Station, coordinating and keeping track of the scientific experiments taking place—24/7, 365 days a year.With the Space Station’s population soon to jump from three to seven, our ISS crew will be able to spend up to 70 hours a week on science, helping us learn how to live in space while making life better on Earth!Image Credit: NASA/Fred DeatonWant to learn more about how America is coming together to launch Crew-1? Join us this afternoon (1 p.m. EST, Thursday, November 12) for a Reddit “Ask Me Anything” with experts from across the nation—then follow along on November 14 as we #LaunchAmerica!Live coverage on NASA TV and social media starts at 3:30 PM EST. See you then!Image Credit: NASA/Emmett GivenMake sure to follow us on Tumblr for your regular dose of space: http://nasa.tumblr.com

It Takes a Nation to #LaunchAmerica!

Image Credit: NASA/Roscosmos

As we celebrate 20 years of humans living and working on the International Space Station, we’re also getting ready for another space milestone: Crew-1, this weekend’s trip to the ISS aboard the SpaceX Crew Dragon Resilience and the first certified crew rotation flight to the International Space Station.

Crew-1 is scheduled to lift off Saturday at 7:49 PM EST, from our Kennedy Space Center—but across the United States, teams from NASA and SpaceX will be hard at work sending our astronauts into orbit!

image

Image Credit: NASA/Fred Deaton

At Marshall Space Flight Center’s Huntsville Operations Support Center (HOSC), for example, engineers with our Commercial Crew Program have been helping review the design and oversee safety standards for SpaceX’s Falcon 9 rocket, making sure it’s ready to carry humans to the Space Station.

This Saturday, they’ll be in the HOSC to monitor launch conditions and watch the data as Crew-1 blasts off, helping future commercially-operated missions to the ISS run even more smoothly.

image

Image Credit: NASA/Emmett Given

Long before Crew-1, though, Marshall has been keeping things active on board the ISS. For decades, the Payload Operations and Integration Center, also located in the HOSC, has been “science central” for the Space Station, coordinating and keeping track of the scientific experiments taking place—24/7, 365 days a year.

With the Space Station’s population soon to jump from three to seven, our ISS crew will be able to spend up to 70 hours a week on science, helping us learn how to live in space while making life better on Earth!

image

Image Credit: NASA/Fred Deaton

Want to learn more about how America is coming together to launch Crew-1? Join us this afternoon (1 p.m. EST, Thursday, November 12) for a Reddit “Ask Me Anything” with experts from across the nation—then follow along on November 14 as we #LaunchAmerica!

image

Live coverage on NASA TV and social media starts at 3:30 PM EST. See you then!

Image Credit: NASA/Emmett Given

Make sure to follow us on Tumblr for your regular dose of space: http://nasa.tumblr.com

Source : NASA More   

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Long March 3B lofts second Tiantong-1 spacecraft

China launched the second Tiantong-1 mobile communications satellite on Thursday. The launch took place at… The post Long March 3B lofts second Tiantong-1 spacecraft appeared first on NASASpaceFlight.com.

Long March 3B lofts second Tiantong-1 spacecraft

China launched the second Tiantong-1 mobile communications satellite on Thursday. The launch took place at 15:59 UTC Long March-3B/G2 (Chang Zheng-3B/G2) from the LC2 Launch Complex at the Xichang Satellite Launch Center.

Tiantong-1 is an S-band mobile communication satellite developed by the Chinese Academy of Space Technology and operated by China SatCom.

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  • In geosynchronous orbit, the satellite will provide mobile communications services, including mobile data and multimedia services around China and the Middle East, Africa, the Pacific, and the Indian Ocean.

    The satellite mobile communication system application subsystem was developed by Henan Communication Technology Co., Ltd., Xinxiang.

    Tiantong-1 (02) was developed based on the DFH-4 satellite bus and has a launch mass of around 4,600 kg, with an expected life-time in orbit of 15 years.

    The first Tiantong-1 satellite was launched on August 5, 2016, using the Long March-3B/G2 (Y35) from the LC3 Launch Complex at Xichang.

    Tiantong-1 (03) is scheduled for launch in 2021.

    The Long March-3B (Chang Zheng-3B) launch vehicle started in 1986 to meet the international satellite launch market’s demand, especially for high power and heavy communications satellites. Its development was based on the fight proven technology of Long March launch vehicles.

    Developed from the Chang Zheng-3A, the Chang Zheng-3B is the most powerful launch vehicle on the Chinese space launch fleet.

    The CZ-3B features enlarged launch propellant tanks, improved computer systems, a larger 4.2-meter diameter payload fairing, and four strap-on boosters in the core stage that provide additional help during the first phase of the launch.

    The Long March on the pad ahead of launch – via Chinese social media

    The rocket can launch an 11,200 kg satellite to a low Earth orbit or a 5,100 kg cargo to a geosynchronous transfer orbit.

    The CZ-3B/G2 (Enhanced Version) launch vehicle was developed from the CZ-3B with a lengthened first core stage and strap-on boosters, increasing the GTO capacity up to 5,500kg.

    On May 14, 2007, the first flight of CZ-3B/G2 was performed successfully, accurately sending the NigcomSat-1 into pre-determined orbit. With the GTO launch capability of 5,500kg, CZ-3B/G2 is dedicated to launching heavy GEO communications satellites.

    The rocket structure also combines all sub-systems and comprises four strap-on boosters, a first stage, a second stage, a third stage, and payload fairing.

    The first two stages and the four strap-on boosters use hypergolic (N2O4/UDMH) fuel, while the third stage uses cryogenic (LOX/LH2) fuel. The total length of the CZ-3B is 54.838 meters, with a diameter of 3.35 meters on the core stage and 3.00 meters on the third stage.

    On the first stage, the CZ-3B uses a YF-21C engine with a 2,961.6 kN thrust and a specific impulse of 2,556.5 Ns/kg. The first stage diameter is 3.35 m, and the stage length is 23.272 m.

    Each strap-on booster is equipped with a YF-25 engine with a 740.4 kN thrust and a specific impulse of 2,556.2 Ns/kg. The strap-on booster diameter is 2.25 m, and the strap-on booster length is 15.326 m.

    The second stage is equipped with a YF-24E (main engine – 742 kN / 2,922.57 Ns/kg; four vernier engines – 47.1 kN / 2,910.5 Ns/kg each). The second stage diameter is 3.35 m, and the stage length is 12.920 m.

    The third stage is equipped with a YF-75 engine developing 167.17 kN and a specific impulse of 4,295 Ns/kg. The fairing diameter of the CZ-3B is 4.00 meters and has a length of 9.56 meters.

    The CZ-3B can also use the new Yuanzheng-1 (“Expedition-1″) upper stage that uses a small thrust 6.5 kN engine burning UDMH/N2O4 with specific impulse at 3,092 m/s. The upper stage can conduct two burns, have a 6.5 hour lifetime, and achieve a variety of orbits. This upper stage was not used on this launch.

    Typical flight sequence for the CZ-3B/G2 sees the launch pitching over 10 seconds after liftoff from the Xichang Satellite Launch Centre. Boosters shutdown 2 minutes and 7 seconds after liftoff, separation from the first stage one second later. The first stage shutdown takes place at 1 minute 25 seconds into the flight.

    The separation between the first and second stages occurs at 1 minute 26 seconds, following fairing separation at T+3 minutes 35 seconds. Stage 2 main engine shutdown occurs 326 seconds into the flight, followed by the vernier engines’ shutdown 15 seconds later.

    The separation between the second and the third stage and the third stage’s ignition occurs one second after the shutdown of the second stage’s vernier engines. The first burn of the third stage will last for 4 minutes and 44 seconds.

    After the end of the first burn of the third stage follows a coast phase that ends at T+20 minutes and 58 seconds, with the third stage initiating its second burn. This will have a 179 seconds duration. After the second burn of the third stage, the launcher initiates a 20-second velocity adjustment maneuver.

    Spacecraft separation usually takes place at T+25 minutes 38 seconds after launch. However, no confirmation has been provided at this time.

    The Xichang Satellite Launch Centre is situated in the Sichuan Province, southwestern China, and is its launch site for geosynchronous orbital launches.

    The Launch Site – Google Earth

    Equipped with two launch pads (LC2 and LC3), the center has a dedicated railway and highway lead directly to the launch site.

    The Command and Control Centre is located seven kilometers south-west of the launch pad, providing flight and safety control during launch rehearsal and launch.

    Other facilities on the Xichang Satellite Launch Centre are the Launch Control Centre, propellant fuelling systems, communications systems for launch command, telephone and data communications for users, and support equipment for meteorological monitoring and forecasting.

    The post Long March 3B lofts second Tiantong-1 spacecraft appeared first on NASASpaceFlight.com.

    Source : NASA More   

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