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Thread: Mystery Mission: Air Force's X-37B space plane nears 1 year in orbit

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    Mystery Mission: Air Force's X-37B space plane nears 1 year in orbit

    http://www.foxnews.com/science/2016/...-in-orbit.html

    May 13, 2016



    The U.S. military's uncrewed X-37B space plane is nearing one year in orbit on its latest secret mission.

    The robotic space plane launched atop a United Launch Alliance Atlas V rocket on May 20, 2015, kicking off the X-37B program's fourth flight. This mission, dubbed OTV-4 (short for Orbital Test Vehicle-4), remains a clandestine affair.

    "I can confirm the fourth OTV mission is approaching one year on orbit," Air Force spokeswoman Capt. Annmarie Annicelli said in response to Space.com's inquiry about the X-37B's activities. [The X-37B's Fourth Mystery Mission in Photos]

    Annicelli had nothing further to add.

    Mysterious minishuttle
    The X-37B looks like a miniature adaptation of NASA's now-retired space shuttle orbiter. The military space plane is 29 feet long and 9.6 feet tall, and has a wingspan of nearly 15 feet. For comparison, the space shuttle was 122 feet long, with a wingspan of 78 feet.

    The X-37B spacecraft has a payload bay about the size of a pickup-truck bed. It has a launch weight of 11,000 lbs. and is powered on orbit by gallium arsenide solar cells with lithium-ion batteries.

    Two reusable vehicles are known to constitute the X-37B fleet. This current OTV-4 mission marks the second flight of the second X-37B vehicle, which Boeing built for the Air Force.

    Boeing's involvement in the program dates back to 1999. The X-37B vehicle development falls under Boeing's Defense, Space and Security division in El Segundo, California, the firm's center for all space and experimental systems and government and commercial satellites.

    Most of the X-37B's payloads and specific activities are classified, which has led to some speculation that the space plane could be a weapon of some sort. Air Force officials have always denied this claim, maintaining that they use the X-37B to explore reusable space vehicle technologies in support of long-term objectives, such as risk reduction and operations development. [The X-37B Military Space Plane Explained (Infographic)] The Air Force Rapid Capabilities Office is leading the Department of Defense's OTV initiative, by direction of the Under Secretary of Defense for Acquisition, Technology and Logistics and the secretary of the Air Force.

    Four space missions
    To date, the program has chalked up an impressive flight record.

    According to an Air Force fact sheet, starting with the program's first launch on April 22, 2010, the first three OTV missions have spent a total of 1,367 days in orbit, "successfully checking out the X-37B's reusable flight, re-entry and landing technologies."

    All three missions ended successfully with a tarmac touchdown at Vandenberg Air Force Base in California, gliding onto a landing strip on autopilot.

    Arrows in its quiver
    A few payloads on board the OTV-4 craft have been identified.

    For example, Aerojet Rocketdyne announced that its XR-5A Hall Thruster had completed initial on-orbit validation testing on board the X-37B space plane. It is also known that the vehicle carries a NASA advanced materials investigation, as well as an experimental propulsion system developed by the Air Force.

    "While no more specifics have been offered about the X-37B by the Air Force since it began flying the orbital technology test bed in 2010, the overall mission seems clear: Lengthy missions allow time for seeing what such a vehicle has to offer in terms of capabilities," Joan Johnson-Freese, a professor of national security affairs at the U.S. Naval War College in Newport, Rhode Island, told Space.com. "The military likes to have lots of arrows in its quiver."

    However, Mark Gubrud, a physicist and adjunct professor in the peace, war and defense curriculum at the University of North Carolina, offered a different take on the program.

    "Now that the novelty has worn off, it might be time for the Air Force to look over whatever results they've been getting from its use, and assess whether that couldn't be accomplished at lower cost with conventional rockets, satellites, maneuvering satellites, recovery capsules, etc.," Gubrud said.

    "If the Air Force won't do that, maybe the Office of the Secretary of Defense or Congress should," Gubrud told Space.com. "If you send something up and leave it there for years at a time, that's basically a satellite, and if X-37B has become a workhorse, the question is still whether it's cost-effective."

    Landing: when and where?
    As in the past, it's not known how many days the current OTV-4 mission will orbit the Earth. It's also unclear where OTV-4 will land.

    Boeing Defense, Space and Security has been making progress on consolidating its space plane operations, including the possibility of using NASA's Kennedy Space Center (KSC) in Florida as a landing site for the X-37B by mid- to late 2016. (KSC is right next door to Cape Canaveral Air Force Station, the space plane's launch site.)

    Under the Boeing plan, a former KSC space shuttle facility known as Orbiter Processing Facility (OPF-1) was converted into a structure that will enable the Air Force "to efficiently land, recover, refurbish and relaunch the X-37B Orbital Test Vehicle (OTV)," according to Boeing.

    Work has been ongoing to get KSC ready as a landing site for the X-37B, but Vandenberg is still being maintained as a landing location, with Edwards Air Force Base in California serving as a backup site, Air Force officials have said.






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  4. #3
    http://www.n2yo.com/satellite/?s=40651

    OTV 4 (USA 261) also known as X-37B is a reusable unmanned spacecraft. OTV 4 is a fourth X-37B mission codenamed AFSPC-5, launched aboard an Atlas V rocket from Cape Canaveral Air Force Station on May, 20 2015. The launch was designated USA-261, and is the second flight of the second X-37B vehicle. The mission will test a Hall effect thruster in support of the Advanced Extremely High Frequency communications satellite program, and conduct a NASA investigation for testing various materials in space. The mission is expected to last at least 200 days.
    Launch date: May 20, 2015

    https://spaceflightnow.com/2015/05/0...ard-the-x-37b/

    NASA gives more information on its experiment aboard the X-37B


    CAPE CANAVERAL — In addition to carrying an Air Force electric propulsion thruster test, a materials research investigation sponsored by NASA’s Marshall Space Flight Center will be flying aboard the X-37B miniature spaceplane later this month.

    Liftoff is targeted for May 20 aboard a United Launch Alliance Atlas 5 rocket from Cape Canaveral Air Force Station in Florida.

    Pentagon officials recently disclosed that the two experiments are flying aboard this fourth Orbital Test Vehicle mission, and now NASA has provided a bit more detail on its investigation that will ride up and down on the reusable X-37B.

    Known as the Materials Exposure and Technology Innovation in Space, or METIS, the investigation on the X-37B will expose nearly 100 different materials samples to the space environment for more than 200 days, NASA says. METIS is building upon data obtained by several missions of the Materials on International Space Station Experiment (MISSE), which flew more than 4,000 samples in space from 2001 to 2013.

    For both MISSE and METIS, small samples the size of quarters are used. METIS will fly a variety of materials including polymers, composites and coatings.

    “By exposing materials to space and returning the samples to Earth, we gain valuable data about how the materials hold up in the environment in which they will have to operate,” said Miria Finckenor, the co-investigator on the MISSE experiment and principal investigator for METIS at NASA’s Marshall Space Flight Center in Huntsville, Alabama.

    “Spacecraft designers can use this information to choose the best material for specific applications, such as thermal protection or antennas or any other space hardware.”

    Finckenor leads a team of investigators from other NASA centers, aerospace companies and universities.

    NASA says the METIS experiment is researching a variety of materials of interest for use on spacecraft built by NASA, industry and other government agencies. “The materials flown in space are potential candidates to replace obsolescent materials with environmentally-friendly options,” the space agency says.

    “Data from the space station and METIS materials experiments will improve the lifetime and operations of future spacecraft needed for NASA’s journey to Mars,” said Lisa Watson-Morgan, Marshall’s chief engineer.
    More at link.


    MISSE aboard the International Space Station. Credit: NASA


    In addition to the NASA test, the X-37B also carries a Hall thruster demonstration to test design modifications for the propulsion system aboard Air Force Advanced Extremely High Frequency communications satellites. Flight controllers will see how the thruster performs in the space environment and measure the amount of thrust imparted on the vehicle.



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