Category Archives: Aerospace

NASA’s Voyager Spacecraft Still Reaching for the Stars After 40 Years

Humanity’s farthest and longest-lived spacecraft, Voyager 1 and 2, achieve 40 years of operation and exploration this August and September. Despite their vast distance, they continue to communicate with NASA daily, still probing the final frontier.
Their story has not only impacted generations of current and future scientists and engineers, but also Earth’s culture, including film, art and music. Each spacecraft carries a Golden Record of Earth sounds, pictures and messages. Since the spacecraft could last billions of years, these circular time capsules could one day be the only traces of human civilization.

“I believe that few missions can ever match the achievements of the Voyager spacecraft during their four decades of exploration,” said Thomas Zurbuchen, associate administrator for NASA’s Science Mission Directorate (SMD) at NASA Headquarters. “They have educated us to the unknown wonders of the universe and truly inspired humanity to continue to explore our solar system and beyond.”

The Voyagers have set numerous records in their unparalleled journeys. In 2012, Voyager 1, which launched on Sept. 5, 1977, became the only spacecraft to have entered interstellar space. Voyager 2, launched on Aug. 20, 1977, is the only spacecraft to have flown by all four outer planets — Jupiter, Saturn, Uranus and Neptune. Their numerous planetary encounters include discovering the first active volcanoes beyond Earth, on Jupiter’s moon Io; hints of a subsurface ocean on Jupiter’s moon Europa; the most Earth-like atmosphere in the solar system, on Saturn’s moon Titan; the jumbled-up, icy moon Miranda at Uranus; and icy-cold geysers on Neptune’s moon Triton.

Though the spacecraft have left the planets far behind — and neither will come remotely close to another star for 40,000 years — the two probes still send back observations about conditions where our Sun’s influence diminishes and interstellar space begins.

Voyager 1, now almost 13 billion miles from Earth, travels through interstellar space northward out of the plane of the planets. The probe has informed researchers that cosmic rays, atomic nuclei accelerated to nearly the speed of light, are as much as four times more abundant in interstellar space than in the vicinity of Earth. This means the heliosphere, the bubble-like volume containing our solar system’s planets and solar wind, effectively acts as a radiation shield for the planets. Voyager 1 also hinted that the magnetic field of the local interstellar medium is wrapped around the heliosphere.

Voyager 2, now almost 11 billion miles from Earth, travels south and is expected to enter interstellar space in the next few years. The different locations of the two Voyagers allow scientists to compare right now two regions of space where the heliosphere interacts with the surrounding interstellar medium using instruments that measure charged particles, magnetic fields, low-frequency radio waves and solar wind plasma. Once Voyager 2 crosses into the interstellar medium, they will also be able to sample the medium from two different locations simultaneously.

“None of us knew, when we launched 40 years ago, that anything would still be working, and continuing on this pioneering journey,” said Ed Stone, Voyager project scientist based at Caltech in Pasadena, California. “The most exciting thing they find in the next five years is likely to be something that we didn’t know was out there to be discovered.”

The twin Voyagers have been cosmic overachievers, thanks to the foresight of mission designers. By preparing for the radiation environment at Jupiter, the harshest of all planets in our solar system, the spacecraft were well equipped for their subsequent journeys. Both Voyagers carry redundant systems that allow the spacecraft to switch to backup systems autonomously when necessary, as well as long-lasting power supplies. Each Voyager has three radioisotope thermoelectric generators, devices that use the heat energy generated from the decay of plutonium-238 — only half of it will be gone after 88 years.

Space is almost empty, so the Voyagers are not at a significant level of risk of bombardment by large objects. However, Voyager 1’s interstellar space environment is not a complete void. It’s filled with clouds of dilute material remaining from stars that exploded as supernovae millions of years ago. This material doesn’t pose a danger to the spacecraft, but is a key part of the environment that the Voyager mission is helping scientists study and characterize.

Because the Voyagers’ power decreases by four watts per year, engineers are learning how to operate the spacecraft under ever-tighter power constraints. And to maximize the Voyagers’ lifespans, they also have to consult documents written decade’s earlier describing commands and software, in addition to the expertise of former Voyager engineers.

“The technology is many generations old, and it takes someone with 1970s design experience to understand how the spacecraft operate and what updates can be made to permit them to continue operating today and into the future,” said Suzanne Dodd, Voyager project manager based at NASA’s Jet Propulsion Laboratory in Pasadena.

Team members estimate they will have to turn off the last science instrument by 2030. However, even after the spacecraft go silent, they’ll continue on their trajectories at their present speed of more than 30,000 mph (48,280 kilometers per hour), completing an orbit within the Milky Way every 225 million years.

The Voyager spacecraft were built by JPL, which continues to operate both. The Voyager missions are part of the NASA Heliophysics System Observatory, sponsored by the Heliophysics Division of the Science Mission Directorate.

Source: NASA

Honeywell Engineer Awarded Prestigious NASA Silver Snoopy Award

Honeywell Engineer Syed Hasan has been awarded the prestigious Space Flight Awareness Silver Snoopy Award by NASA which recognizes outstanding achievements related to human flight safety or mission success.

Astronaut Anna Lee Fisher presented Hasan with the award at a ceremony at the agency’s Goddard Space Flight Center in Maryland this week. The award, which is given out to NASA employees or contractors, honors the contributions made toward enhancing the probability of mission success, improvements in design, administrative/technical/production techniques, business systems, flight and/or systems safety or identification and correction or preventive action for errors. The award consists of a silver “Snoopy” lapel pin flown during a NASA mission, a commendation letter, and a signed certificate. Hasan’s pin was flown aboard a 2006 Space Shuttle Mission to the International Space Station.

Hasan, a 10-year Honeywell veteran, is the Lead Collision Avoidance Engineer for the Earth Observing System missions (Terra, Aqua and Aura) at NASA Goddard Space Flight Center in Greenbelt, MD. He was nominated for his dedication, commitment, and outstanding support to the Space Flight program while working in the Flight Dynamics Facility as the Human Space Flight lead. He played a major role in the success of the early SpaceX Commercial Orbital Transportation Services (COTS) Demo Flights. Syed developed a process improvement in tracking the unmanned SpaceX Dragon cargo spacecraft during reentry. His process, which involved a more efficient way to process SpaceX-provided trajectory data, yielded better tracking and better communication with the spacecraft on re-entry. Post mission, SpaceX reported highly improved tracking results and expressed their pleasure with the performance of the new support method.

Aerospace, Defense, Space

 

Soyuz to launch astronauts for a year long mission

Expedition 43 Soyuz Rollout

The first one-year crew for the International Space Station is set to launch today. NASA Television will provide extensive coverage of the launch and the crew’s arrival to the orbital laboratory.

NASA astronaut Scott Kelly and Russian Federal Space Agency (Roscosmos) cosmonaut Mikhail Kornienko will spend a year living and working aboard the space station and will launch with cosmonaut Gennady Padalka. The trio will become part of the station’s Expedition 43 crew.

NASA TV coverage will begin at 2:30 p.m. EDT March 27, with launch scheduled for 3:42 p.m. (1:42 a.m. Saturday, March 28 in Baikonur) from the Baikonur Cosmodrome in Kazakhstan. The trio will ride to space in a Soyuz spacecraft, which will rendezvous with the space station and dock after four orbits of Earth. Docking to the space station’s Poisk module will take place at 9:36 p.m. Friday. NASA TV coverage of docking will begin at 8:45 p.m.

Hatches between the Soyuz and the station will be opened at approximately 11:15 p.m., at which time Expedition 43 Commander Terry Virts of NASA and his crewmates, Anton Shkaplerov of Roscosmos and Samantha Cristoforetti of ESA (European Space Agency), will greet Kelly, Kornienko and Padalka. Hatch opening coverage begins on NASA TV at 10:45 p.m.

Kelly and Kornienko will spend a year on the space station to better understand how the human body reacts and adapts to the harsh environment of space. Data from the expedition will be used to determine whether there are ways to further reduce the risks on future long-duration missions to an asteroid and eventually Mars.

The crew will support several hundred experiments in biology, biotechnology, physical science and Earth science — research that impacts life on Earth. Data and samples will be collected throughout the year from a series of studies involving Scott and his twin brother, former NASA astronaut Mark Kelly. The studies will compare data from the genetically-identical Kelly brothers to identify any subtle changes caused by spaceflight.

Padalka will spend six months aboard the outpost, during which he will become the first four-time station commander and record holder for most cumulative time spent in space.