Returning from an escort and icebreaking mission to Nome, Alaska, assisting the Russian tanker Renda delivery of emergency fuel to the town, the USCGC HEALY — Coast Guard's only polar icebreaker — was approximately 260 nautical miles south of the Arctic Circle at the time of the test.
The USCG cutter HEALY (WAGB-20) escorts Russian fuel tanker Renda in Alaska's Bering Sea, Jan. 11, 2012. (United States Coast Guard)
Deployed into a unique, highly elliptical orbit with an apogee of 12,050 kilometers, TacSat-4 helps augment current geosynchronous satellite communication by including the high latitudes. The experiment was the first in a series of planned steps that aim to demonstrate TacSat-4's utility in the polar and arctic regions.
Also participating in communications with the HEALY was the Army Space and Missile Defense Battle Lab (SMDBL) located in Colorado Springs, Col. The SMDBL team was conducting portions of the ongoing TacSat-4 Joint Military Utility Assessment (JMUA).
Managed by the U.S. Naval Research Laboratory, Naval Center for Space Technology, TacSat-4 is an experimental spacecraft that will test advances in several technologies and SATCOM techniques. It will augment the existing fleet with an additional space asset to provide communications to otherwise under-served users and areas that either do not have high enough priority or do not have satellite visibility.The Office of Naval Research (ONR) is funding the first year of TacSat-4 operations. The Operationally Responsive Space (ORS) Office is leading and funding the JMUA of TacSat-4.
Daniel Parry | EurekAlert!
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University of Maryland researchers contribute to historic detection of gravitational waves and light created by event
On August 17, 2017, at 12:41:04 UTC, scientists made the first direct observation of a merger between two neutron stars--the dense, collapsed cores that remain...
Seven new papers describe the first-ever detection of light from a gravitational wave source. The event, caused by two neutron stars colliding and merging together, was dubbed GW170817 because it sent ripples through space-time that reached Earth on 2017 August 17. Around the world, hundreds of excited astronomers mobilized quickly and were able to observe the event using numerous telescopes, providing a wealth of new data.
Previous detections of gravitational waves have all involved the merger of two black holes, a feat that won the 2017 Nobel Prize in Physics earlier this month....
Material defects in end products can quickly result in failures in many areas of industry, and have a massive impact on the safe use of their products. This is why, in the field of quality assurance, intelligent, nondestructive sensor systems play a key role. They allow testing components and parts in a rapid and cost-efficient manner without destroying the actual product or changing its surface. Experts from the Fraunhofer IZFP in Saarbrücken will be presenting two exhibits at the Blechexpo in Stuttgart from 7–10 November 2017 that allow fast, reliable, and automated characterization of materials and detection of defects (Hall 5, Booth 5306).
When quality testing uses time-consuming destructive test methods, it can result in enormous costs due to damaging or destroying the products. And given that...
Using a new cooling technique MPQ scientists succeed at observing collisions in a dense beam of cold and slow dipolar molecules.
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Scientists from the Max Planck Institute of Quantum Optics, using high precision laser spectroscopy of atomic hydrogen, confirm the surprisingly small value of the proton radius determined from muonic hydrogen.
It was one of the breakthroughs of the year 2010: Laser spectroscopy of muonic hydrogen resulted in a value for the proton charge radius that was significantly...
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