China launches Chang Zheng 2C with trio of Yaogan-30 satellites

China has successfully launched a Chang Zheng 2C (also known as the Long March 2C)… The post China launches Chang Zheng 2C with trio of Yaogan-30 satellites appeared first on NASASpaceFlight.com.

China launches Chang Zheng 2C with trio of Yaogan-30 satellites

China has successfully launched a Chang Zheng 2C (also known as the Long March 2C) from teh Xichang Satellite Launch Center with three new Yaogan-30 satellites on June 18 at 06:30 UTC / 14:30 local time at the launch site from LC-3 after a 24 hour delay due to weather.

The launch of Yaogan-30 Group 9 comes less than a day after the launch of Shenzhou-12 from LA-4 at the Jiuquan Satellite Launch Center which carried Chinese taikonauts Nie Haisheng, Liu Boming, and Tang Hongbo to orbit for a rendezvous with the Chinese Tianhe core module.

The Xichang Satellite Launch Center is located in Sichuan Province and is one of four land launch sites in China, which include Wenchang, Taiyuan, and Jiuquan as well. China has also used a converted barge to launch two CZ-11s from the Yellow Sea.

Xichang entered operations in 1984 as a civilian, military, and scientific spaceport. It has two launch complexes, -2 and -3 (with -1 never having been built; it is now used as a viewing location).

After liftoff from LC-3, the CZ-2C rocket — making the Chang Zheng series 375th launch — travelled southeast over southern China. As the vehicle ascended downrange over land, the rocket passed over communities in Sichuan, northern Yunnan, Guizhou, northern Guangxi, southern Hunan, and Guangdong provinces.

Unlike launches from the Wenchang Satellite Launch Center, which move harmlessly out over the sea from Hainan Island, flights from Xichang overfly land — dropping spent stages on inland areas.

After clearing the coast over southeastern China, the CZ-2C then passed just south of the southern tip of Taiwan. This launch trajectory was similar to two other CZ-2C launches, both belonging to Yaogan-30 launches of Group 3 on December 25, 2017 and Group 4 on January 25, 2018.

This group of Yaogan-30s was the ninth trio of such satellites to be launch. The Yaogan constellation is claimed by Chinese media to be for scientific purposes; however, most other nations say the satellites are military intelligence platforms given similarities to the Naval Ocean Surveillance System, or NOSS, used by the U.S. Navy.

Yaogan-30 Group 9 Updates
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  • In addition to the three Yaogans, an additional rideshare payload was onboard: Tianqi-14 for Beijing Guodian Gaoke Technogloy Co, Ltd.

    The next launch of Yaogan satellites, Group 10 is scheduled for no earlier than July. The launch will also occur from Xichang on a CZ-2C.

    The launch vehicle

    The Chang Zheng-2C is a variant of the CZ-2 family of launch vehicles that also includes the CZ-2F which currently launches China’s human space missions.

    The Chang Zheng rocket family is known as Chang Zheng in China and Long March internationally. The family is named after the journey made by the Chinese Red Army between October 1934 and October 1935 to evade Nationalist forces during the Chinese Civil War, an event that became known as the Long March.

    The CZ-2 rocket family is based on the Dongfeng-5 intercontinental ballistic missile. The Dongfeng-5 ICBM made its first launch on September 10, 1971, but the launch was only partially successful.

    An early launch of a Chang Zheng/Long March-2C. Credit: Globalsecurity.org.

    The debut of the CZ-2 occurred November 5, 1974 with a CZ-2A variant from LC-2 at China’s Jiuquan Satellite Launch Center. The subsequent variant, the CZ-2C launched for the first time on September 9, 1982 also from Jiuquan.

    The CZ-2C has two stages, with an optional third stage. The first stage consists of four YF-20 engines. The YF-20 runs on Dinitrogen tetroxide (N2O4) and Unsymmetrical dimethylhydrazine (UDMH) — which are highly toxic hypergolic propellants that burn on contact.

    This stage is — depending on a flight’s trajectory — sometimes dropped on or near populated villages and roadways, creating potential deadly situations for Chinese citizens living downrange from the launch site at Xichang.

    The second stage of the CZ-2C has a YF-24E, which consists of a single YF-22E engine paired with four YF-23C vernier engines. Like the YF-20, the YF-24E runs on UDMH and N2O4 hypergolic propellants.

    The optional third stage consists of a single solid rocket motor that burns Hydroxyl-terminated polybutadiene.

    Not all Chinese launch vehicles use hypergolic fuels; the CZ-5 and CZ-7 rocket families utilize liquid hydrogen and liquid oxygen.

    In addition to launching domestic payloads from China, the CZ-2C has launched payloads for Iridium in the past. Between 1997 and 2002, Iridium launched their first generation constellation to orbit. Numerous launch vehicles were used, including the Delta II, Rokot, Proton-K and the CZ-2C.

    A spent Chinese rocket stage (from a previous mission) after it crashed into the ground near populated areas.

    The first CZ-2C launch for Iridium occurred on September 1, 1997 from the Taiyuan Satellite Launch Center, which carried two satellites, named Iridium-MFS 1 and Iridium-MFS 2. These satellites were mass simulators for future Iridium launches on the CZ-2C.

    This launch was followed by another CZ-2C mission from Taiyuan on December 8, 1997, which launched Iridium 42 and Iridium 44. In total, the CZ-2C launched six times and deployed a total of 12 Iridium spacecraft for the constellation.

    With the Yaogan 30 Group 9 mission, CZ-2C has completed at least 56 flights (there is a potential discrepancy in the rocket’s total number of missions due to China state secrecy surrounding six flights that might have been flown by the vehicle), with all but one being successful.

    Of the six flights which may be credited to the rocket, five are understood to have been successful with one failure, which could bring the rocket’s total performance figures to 62 missions with two failures.

    (Lead image: CZ-2C launches with Yaogan-30 Group 9 on June 18, 2021.)

    The post China launches Chang Zheng 2C with trio of Yaogan-30 satellites appeared first on NASASpaceFlight.com.

    Source : NASA More   

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    SpaceX launches newest GPS satellite on reused booster

    SpaceX has launched another next-generation Global Positioning System (GPS) satellite for the United States Space… The post SpaceX launches newest GPS satellite on reused booster appeared first on NASASpaceFlight.com.

    SpaceX launches newest GPS satellite on reused booster

    SpaceX has launched another next-generation Global Positioning System (GPS) satellite for the United States Space Force. Falcon 9 lifted off with the GPS-III-SV05 satellite on June 17 from SLC-40 at the Cape Canaveral Space Force Station in Florida right on time at 12:09EDT (16:09 UTC).

    This was the 19th Falcon 9 launch in 2021, and GPS-III-SV05 is the company’s fourth overall mission for the GPS program and the first to use a flight-proven first stage booster.

    Space Launch Delta 45 had predicted a 70% chance of acceptable weather conditions for launch on June 17 as well as for the backup opportunity 24 hours later.

    Mission Preparations

    At 3:30 PM EDT on June 12, SpaceX completed a successful static fire of Falcon 9’s first stage booster, B1062-2. After the test, the first stage and attached second stage were rolled back into the hangar at SLC-40 to be mated to the encapsulated GPS-III-SV05 spacecraft, before returning to the pad prior to launch.

    On the afternoon of June 13, tug Finn Falgout departed Port Canaveral with drone ship Just Read the Instructions in tow. On June 16, the two ships arrived at the landing zone about 642 kilometers downrange from the launch site. GO Quest, the drone ship support vessel, also arrived near the recovery zone shortly after.

    For this mission, a new vessel joined SpaceX’s oceangoing recovery fleet. HOS Briarwood will recover Falcon 9’s payload fairing halves after they splash down in the Atlantic Ocean.

    Similar in size to Shelia Bordelon, the previous temporary fairing recovery vessel, HOS Briarwood can be booked as a “flotel” and features an enormous crane, along with seemingly just enough deck space to support two recovered fairing halves.

    HOS Briarwood, a temporary addition to the SpaceX recovery fleet, in Port Canaveral prior to the GPS-III-SV05 mission – via Stephen Marr for NSF

    Space Force Advancing Reusability 

    Falcon 9 booster B1062-2 supported this mission. The first stage previously launched GPS-III-SV04, the previous GPS mission, in November 2020.

    GPS-III-SV05 Updates

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  • Prior to the GPS-III-SV04 launch, SpaceX announced that the US Space Force would allow the company to recover and reuse Falcon 9 boosters on national security missions, which includes the GPS program. 

    In order to certify SpaceX’s recovery and reuse process, B1062 was specifically reserved for GPS-III-SV05. After returning to port following the GPS-III-SV04 mission, the Space Force conducted a lengthy review of the booster and SpaceX’s refurbishment procedures, before finally clearing it to launch. 

    Last year, SpaceX was also awarded a “fleet surveillance” contract from the Space Force, which gives the branch insight into all of SpaceX’s non-military launches. The agreement was then expanded after the company won the NSSL Phase 2 launch contract in August.

    Going forward, SpaceX will be able to fly other boosters on national security missions, not just ones that previously flew government payloads.

    The GPS-III-SV05 satellite is the fifth of 10 spacecraft in the third generation of GPS satellites. This generation includes improvements such as more accurate precise location tracking and time referencing. 

    The GPS-III-SV05 satellite prior to encapsulation – via Lockheed Martin

    The aging second generation of GPS satellites were launched from 1989 to 2016. Soon the GPS-III and GPS-III Follow-On satellites will replace some of the older satellites before replacing the second generation entirely. 

    The GPS-II generation of satellites were built by Rockwell, then by Boeing, as well as Lockheed Martin. This time around, the GPS-III satellites are based on Lockheed Martin’s A2100 modernized (A2100M) satellite bus.

    A2100M is Lockheed Martin’s Medium Earth Orbit and Geostationary Orbit satellite bus offering. First launched in 1996, this bus has been used for many military and commercial satellites including the SBIRS-GEO satellites, the Arabsat 6A telecommunications satellite, and the Advanced Extremely High Frequency military satellite constellation.

    A more modern version of the A2100, known as the A2100M (modernized), will be used for the GPS-III Follow-On. These satellites will provide even more accurate location tracking and time referencing, but the satellites are also designed to be serviceable on orbit. This can allow the satellites to be upgraded over time. 22 of these satellites will launch starting in 2026.

    In 2008, Lockheed Martin won the contract for the GPS-III satellites. The first GPS-III satellite launched on an expendable Falcon 9 in December 2018. The second GPS-III satellite was launched on the final Delta IV Medium in August 2019.

    This was followed by the third and fourth GPS-III satellites on Falcon 9 in 2020. GPS-III-SV03 was launched by Falcon 9 booster B1060 in June 2020. GPS-III-SV04 was launched by Falcon 9 booster B1062, the same booster to launch the GPS-III-SV05 satellite.

    Falcon 9 B1062 launches the GPS-III-SV04 mission – via Julia Bergeron for NSF/L2

    GPS-III-SV05 weighs approximately 4,331 kilograms, the same as GPS-III-SV03 and GPS-III-SV04. Every GPS-III satellite is equipped with a single LEROS-1 apogee propulsion system as well as twin solar arrays for electrical power.

    The navigation payload for the satellite is provided by L3Harris Technologies. Both GPS-III and GPS-III Follow-On will have a lifetime of 15+ years.

    GPS-III-SV05 was completed during Q1 of 2021 at the Lockheed Martin A2100 production facility in Waterton, Colorado. On April 6, it was transported to Florida by a C-17 Globemaster transport aircraft. There it was taken to the Astrotech Space Operations facility to begin final preparations, which included final testing and fueling of the satellite. 

    After fueling, the satellite was then encapsulated inside Falcon 9’s 5.2 meter diameter payload fairing. 

    Launch Timeline 

    As the countdown clock reached T0, Falcon 9 lifted off and began pitching downrange towards the northeast, targeting a 55 degree inclined orbit.

    At T+2:32, B1062’s nine Merlin engines shut down, followed shortly by stage separation and second stage ignition.

    Falcon 9’s payload fairings then separated at T+3:47, exposing GPS-III SV05 to space. The second stage’s Merlin vacuum engine then shut down at T+8:07, placing the satellite into a parking orbit.

    After doing its job, booster B1062 touched down on the deck of Just Read the Instructions roughly 8 minutes and 30 seconds after launch.

    At T+1:03:35, the second stage ignited for a second and final time to place the payload into a Medium Earth transfer orbit. GPS-III-SV05 was then deployed at T+1:29:20 and will eventually use its own propulsion to circularize its orbit.

    SpaceX has one more mission planned for June, Falcon 9 B1060-8 launching from SLC-40 with the Transporter-2 rideshare mission. Meanwhile, the drone ship Of Course I Still Love You is currently en route to the west coast via the Panama Canal to support a launch manifest at Vandenberg Space Force Base in California.

    (Lead image: Falcon 9 launch GPS III SV05. Credit: Stephen Marr for NSF L2)

    The post SpaceX launches newest GPS satellite on reused booster appeared first on NASASpaceFlight.com.

    Source : NASA More   

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