Tag: kuiper belt

News from Space: New Horizons Passes Neptune

new-horizons-neptuneIt certainly has been a momentous few weeks for space exploration! Between the final weeks of August and the month of September, we’ve seen the Curiosity rover reach Mount Sharp, the Rosetta spacecraft created the first full map of a comet’s, the completion of the Orion space module, and the MAVEN orbiter reach Martian orbit. And before the month is out, India’s Mars Orbiter Mission (MOM) will also arrive in orbit around the Red Planet.

Despite all these developments, that occurred (relatively) close to home, there was even more news to be had, coming all the way from the edge of the Solar System no less. At the tail end of August, NASA announced that the New Horizons space probe passed Neptune orbit and is on its way to Pluto. Launched back in 2006 for the purpose of studying the dwarf planet, the probe is expected to arrive on July 14th of next year.

new-horizons-neptune-8NASA says that the the craft passed the Neptunian orbit at 10:04 pm EDT on Monday August 25th, which coincided with the 25th anniversary of Voyager 2’s flyby of Neptune in 1989. But where Voyager came within 4,950 km (3,080 mi) of the gas giant, the New Horizons craft passed by at a distance of 3.96 billion km (2.45 billion mi). The spacecraft is now almost 4.42 billion km (2.75 billion mi) from Earth, and is the fastest man-made object ever sent into space.

Nevertheless, New Horizons’ Long Range Reconnaissance Imager (LORRI) was still able to capture images of Neptune and its giant moon Triton. As you can see from the image below, Neptune appears as the large white disc in the middle, while Triton is the small black dot passing in front and sitting slightly to the ride. NASA says that Triton may be very similar to Pluto and the information gathered by Voyager 2 may prove helpful in the coming encounter.

new_horizons_plutoRalph McNutt of the Johns Hopkins University Applied Physics Laboratory.

There is a lot of speculation over whether Pluto will look like Triton, and how well they’ll match up. That’s the great thing about first-time encounters like this – we don’t know exactly what we’ll see, but we know from decades of experience in first-time exploration of new planets that we will be very surprised.

The first mission in NASA’s New Frontiers program, the New Horizons mission was launched on January 19, 2006 atop an Atlas V rocket from Cape Canaveral, Florida. It broke the record for the fastest man-made object on lift off with a speed of 58,536 km/h (36,373 mph). The 478 kg (1,054 lb) spacecraft was sent on a 9.5-year mission to fly by Pluto – a distance so far that radio signals from the nuclear-powered probe take four hours to reach Earth.

new-horizons-neptune-7Sent on a slingshot trajectory using the gravitational pull of Jupiter, which tacked on another 14,480 km/h (9,000 mph) to its speed, New Horizons will pass Pluto in July of next year at a distance of 13,000 km (8,000 mi). After this encounter, it will continue on out of the Solar System, during which it will be in the distant Kuiper belt studying one or more Kuiper belt objects (KBOs).

Though this will still not rival Voyager 1’s accomplishments, which left our Solar System last year, New Horizons promises to gather far more information on the Outer Solar System and what lies beyond. All of this will come in mighty handy when at last, humanity contemplates sending manned missions into deep space, either to Alpha Centauri or neighboring exoplanets.

Sources: gizmag.com, nasa.gov

The Future is Here: NASA’s Ion Drive!

Ion_thruster_nasaWell, it seems Star Trek might have gotten another one right. In addition to warp travel, computer pads, and the possibility of a real-life star ship Enterprise being built by 2030, it seems that ion engines that can propel ships on interplanetary missions are also possible. As a staple of many science fiction franchises, many have wondered whether or not the technology would ever be truly feasible.

For years, NASA has been experimenting with various ionic propulsion drives. But with this latest announcement, they’ve not only indicated success, but broke a world record. On Dec 28th, in one of the last news stories of the year, NASA announced that their Evolutionary Xenon Thruster (NEXT) has operated continually for over 43,000 hours (just shy of five years). Since ion thrusters are believed to be one of the best ways to power long-term deep-space missions, this is a big step towards powering NASA’s next-gen spacecraft.

Electrostatic_ion_thruster-en.svg_As the name suggests, ion thrusters work by firing ions (charged atoms or molecules) out of a nozzle at high speed. In the case of NEXT, Xenon (a noble gas) is squirted into a chamber where its molecules are charged via an electron gun, creating a plasma of negative and positive ions. The positive ions diffuse to the back of the chamber, where high-charged accelerator grids grabs them and propel them out of the engine, creating thrust.

The upside of such a thruster lies in its fuel efficiency, in that it uses 10-12 times less fuel than a regular chemical thruster. Unfortunately, the downside lies in the thrust, again relative to its chemical counterparts. Due to this, NASA scientists calculated that an ion engine needs to operate continuously for a minimum of 10,000 hours (roughly a year) to slowly accelerate a spacecraft to speeds necessary to reach the asteroid belt or beyond.

asteroidsWith this test, NASA proved that their new ion thruster would not only be able to propel a spaceship to the asteroid belt, but to the outer planets and their moons as well. That’s good news for people looking forward to visiting Ganymede, Europa, Titan, and maybe even the Kuiper Belt. What’s more, the maximum speed of the spacecraft would be in the region of  321,000 km/h (200,000 mph).

Back in 2011, NASA put out a request-for-proposals for a test mission that will likely use a NEXT engine. Presumably, following this successful engine test, we might be hearing more about this in the near future. And, now that the proof in the pudding, other space agencies are likely to unveil their own prototypes for ion engines, and even equipping the next generation of space craft with them.

Asteroid mining? Mars colonization? Off-world resource and manufacturing allocation? Looks like we got ourselves the means to get us there! Oh, and Star Trek nerds? Looks like you guys got your nacelles! Full impulse ahead!

asteroid_beltSource: Extremtech.com, NASA.org