Showing posts with label NASA. Show all posts
Showing posts with label NASA. Show all posts
Tuesday, April 20, 2010


A Solar Sail gathers sunlight as propulsion by means of a large membrane while a Solar "Power" Sail gets electricity from thin film solar cells on the membrane in addition to acceleration by solar radiation. What's more, if the ion-propulsion engines with high specific impulse are driven by such solar cells, it can become a "hybrid" engine that is combined with photon acceleration to realize fuel-effective and flexible missions.
JAXA is studying two missions to evaluate the performance of the solar power sails. The project name for the first mission is IKAROS (Interplanetary Kite-craft Accelerated by Radiation Of the Sun). This craft will be launched with the Venus Climate Orbiter "AKATSUKI", using an H-IIA launch vehicle. This will be the world's first solar powered sail craft employing both photon propulsion and thin film solar power generation during its interplanetary cruise.

Vast, thin, and strong solar sail

A solar sail can move forward without consuming propellant as long as it can generate enough energy from sunlight. This idea was born some 100 years ago, but it had lots of technical hurdles such as the appropriate material and deployment method for the sail. Recently, we have finally seen some prospect of using this technology practically. The sail of the IKAROS is a huge square some 20 meters in a diagonal line, as thin as 0.0075 mm, and made from polyimide resin. On the membrane of the sail are not only thin film solar cells but also an attitude control device and scientific observation sensors. This thin and light solar sail membrane will be deployed using the centrifugal force of spinning the main body of the IKAROS before its tension is maintained. The deployment is in two stages. The first stage is carried out quasi-statically by the onboard deployment mechanism on the side of the main body. The second stage is the dynamic deployment. As this deployment method does not require a strut such as a boom, it can contribute to making it lighter, thus can be apply for a larger membrane.

Sunday, April 18, 2010


NASA's New Asteroid Mission Could Save the Planet 
By Tariq Malik
SPACE.com Managing Editor
posted: 16 April 2010
07:39 pm ET

President Barack Obama set a lofty next goal this week for Americans in space: Visiting an asteroid by 2025. But reaching a space rock in a mere 15 years is a daunting mission, and one that might also carry the ultimate safety of the planet on its shoulders.
"It is probably the hardest thing we can do because the asteroid is not coming on a schedule," NASA chief Charles Bolden told reporters late Thursday after Obama announced his space vision.
And when a specific asteroid is eventually selected, the window to launch a spaceship toward it will be much less forgiving than the windows for NASA space shuttles bound for the International Space Station, Bolden said.

Thursday, April 1, 2010


Featured Missions

International Space Station

Expedition 23
Expedition 23 -- Oleg Kotov, T.J. Creamer and Soichi Noguchi -- is in command on the space station, following the March 18 landing of Expedition 22.
› Space Station Section
› Expedition 23
› Expedition 22
› Interactive Station Guide


Station Gains Unparalleled Views
02.25.10
 
Space shuttle Endeavour lifts off the launch pad.
Image above: An exhaust cloud builds at Launch Pad 39A as space shuttle Endeavour lifts off into the night sky. Image credit: NASA/Sandra, Joseph and Kevin O'Connell
› View larger image

Astronaut Nicholas Patrick on spacewalk.
Image above: Astronaut Nicholas Patrick near the cupola module during the mission's final spacewalk. Image credit: NASA
› View larger image

A group photo of the crew members of the space station and space shuttle Endeavour.
Image above: Combined shuttle and station crews: (front row) Jeffrey Williams, Nicholas Patrick, George Zamka, Robert Behnken, (middle row) Soichi Noguchi, Kathryn Hire, T.J. Creamer, (back row) Maxim Suraev, Oleg Kotov, Stephen Robinson and Terry Virts. Image credit: NASA
› View larger image

Mission Specialist Robert Behnken works inside the newly-installed cupola.
Image above: Backdropped against vistas of Earth below, Mission Specialist Robert Behnken works inside the newly-installed cupola. Image credit: NASA
› View larger image

Endeavour undocks from the station
Image above: With the newly-installed Tranquility node and cupola in the upper left, the space shuttle can be seen backing away after undocking with the station. Image credit: NASA
› View larger image

Endeavour lands at Kennedy
Image above: Endeavour touches down in darkness at NASA's Kennedy Space Center in Florida after 14 days in space. Image credit: NASA/Sandra Joseph and Kevin O'Connell
› View larger image
The view from space has always had the "wow" factor. Now thanks to the bay window-like cupola attached to the new Tranquility node, the International Space Station has a panoramic view that takes the wow factor to the max.

The STS-130 astronauts delivered the two new space station pieces, the final components of the U.S. segment of the station, aboard space shuttle Endeavour during the first mission of the year.

After a one-day weather delay, the shuttle raced into space through Florida's pre-dawn darkness Feb. 8, 2010. The assembled crew consisted of Commander George Zamka, Pilot Terry Virts, and Mission Specialists Robert Behnken, Nicholas Patrick, Kathryn Hire and Stephen Robinson. All but Virts were veterans of previous spaceflights.

After the now-standard robotic inspection of the shuttle's exterior, the crew began to prepare for rendezvous and docking with the station as the mission's two spacewalkers, Patrick and Behnken, checked out their spacesuits. The pair conducted all three of the mission's spacewalks, overcoming several minor spacesuit glitches along the way.

At the same time, the five-member station crew also prepared for the upcoming nine days of docked operations. On board the orbiting laboratory were Expedition 22 Commander Jeff Williams, and Flight Engineers Max Suraev, Oleg Kotov, Soichi Noguchi and T.J. Creamer.

Shuttle Commander Zamka guided Endeavour to a point 600 feet directly below the station and put the shuttle into the backflip maneuver that allows the station crew to photograph the heat shield tiles on the underside to check for damage. With the inspection done, Zamka completed the docking as the two spacecraft were flying 215 miles above Earth.

After the hatches between the joined spacecraft were opened, the combined crew of 11 got down to business, preparing for the work both inside and outside the station.

During the first spacewalk, Patrick and Behnken prepared the Tranquility node for its move out of Endeavour's payload bay. From inside, Virts and Hire positioned Tranquility on the port side of the station's 10-year-old Unity node. It was secured by 16 remotely controlled bolts and the spacewalkers began the processing of connecting the new module to the station's systems. Patrick and Behnken used their second outing to do exterior work to further integrate Tranquility to the station and prepare for the relocation of the cupola.

The cupola was robotically relocated and secured to the Earth-facing port on Tranquility by Hire and Virts. With Behnken and Patrick inside this time operating the station's robotic arm, and Williams and Noguchi working the latches and bolts, a docking adapter was relocated from the Harmony module to the end of Tranquility, taking the spot where the cupola road to space. The newly located adapter will proved another docking point for visiting spacecraft.

During their final trip outside the station, spacewalkers Patrick and Behnken prepared cupola's window covers to be opened for the first time, and finished exterior work on Tranquility and the relocated docking port.

As he opened the window covers one by one, Virts became the first crew member to take in the breathtaking view that the cupola now provides, with Patrick and Behnken on the outside looking in. The observation dome’s seven windows facing Earth will greatly improve views for robotic and docking activities at the station, as well as provide scientific observations of Earth and celestial bodies. To that end, the robotic arm work station will be relocated from the Destiny lab to the cupola.

As part of cupola's dedication ceremony, a moon rock from the Apollo 11 mission was placed inside. The same rock was carried to the summit of Mount Everest by astronaut Scott Parazynski.

Station Commander Jeff Williams replaced parts on the station's water recovery system, a system that was then relocated to Tranquility along with other support systems during an extra day that was added to Endeavour’s flight. Throughout the mission, supplies and new equipment delivered by Endeavour were stowed, and work to outfit Tranquility and cupola was the focus of the combined crews. The new segments added 2,600 cubic feet to the station's interior.

The crew members took time to receive a congratulatory phone call from President Barack Obama near the end of Endeavour’s time docked to the station. The president was accompanied at the White House by a dozen middle school students from across the country who were in the nation's capital for an engineering competition.

With the mission's work completed, the hatches between the two spacecraft were closed, and Endeavour backed away from the expanded station that is now 98 percent complete by volume, 90 percent by mass. After a fly around of the station and final inspection of the shuttle, the STS-130 astronauts prepared for their return to Earth.

Despite not-so-favorable weather predictions, Endeavour landed Feb. 21, 2010, touching down on the Shuttle Landing Facility's Runway 15 at NASA's Kennedy Space Center in Florida. Completing a successful mission, the touchdown brought the shuttle and crew safely back to where their two-week, 5.7-million mile journey began.

› Learn more about the Tranquility node and cupola
› View the STS-130 image gallery

 
 
Cheryl L. Mansfield
NASA's John F. Kennedy Space Center
 


NASA Image of the Day

Expedition 23 Soyuz Rollout

The Soyuz TMA-18 spacecraft arrived by train to the launch pad at the Baikonur Cosmodrome, Kazakhstan, Wednesday, March, 31, 2010. The launch of the Soyuz spacecraft with Expedition 23 Soyuz Commander Alexander Skvortsov, Flight Engineer Mikhail Kornienko and NASA Flight Engineer Tracy Caldwell Dyson is scheduled for Friday, April 2, 2010 at 12:04 a.m. Eastern. Image Credit: NASA/Bill Ingalls

Monday, March 22, 2010

March 23 - April 23 Thule Greenland
Reid, N0RC plans to operate on FM satellites from Thule, Greenland (Grid FQ56) for one month starting March 23. Reid describes his plans, "I will try to use satellites that uplink on VHF, because my transmissions on UHF would interfere with the BMEWS radar on base. I'll need to determine if BMEWS interferes with UHF downlink which will affect my satellite operation." Reid's schedule will be as work/passes/weather permits. He plans to primarily operate the FM satellites due to equip- ment limitations. He plans some HF operating in between passes. Look for OX3RC on the satellites and on HF starting March 23. He will send out an email right before he goes on the air for an available time period. Reid has setup an email list on Google Groups

March 19 - April 2 Turkey  



Rick, WA4NVM will be operating as TA/WA4NVM from Turkey, time permitting on the FM satellites. Below is a list of his planned itinerary:
March 20-22 Istanbul, Turkey KN41/ March 22-23 Canakkale, Turkey KN30 / March 23-25 Kusadasi, Turkey KM37 / March 25-27 Pamukkale, Turkey KM47 / March 27-29 Antalya, Turkey KM56 March 29-31 Cappadocia, Turkey KM78 / March 31-April 02 Istanbul, Turkey KN41

March 20 - March 27 Scotland
Paul, 2E1EUB operating as 2M1EUB from his holiday QTH in northeastern Scotland, about 50 miles west of Aberdeen in the Caringnorms National Park. He will be active on HF and satellites.

Mars Reconnaissance Orbiter

Thursday, February 25, 2010



Enhanced 3D Model of Mars Crater Edge Shows Ups and Downs
02.17.10 -- A dramatic 3D Mars view based on terrain modeling from NASA's Mars Reconnaissance Orbiter data shows "highs and lows" of Mojave Crater. 



Views of Station After STS-130 Undocking

Views of Station After STS-130 Undocking



Moon and Mars

Moon and Mars

Sunday, February 14, 2010


Above, Dr. Hans Eric Hollmann is consulting for the GEMA Company where he helped 
design the first modern radar sets. He had over 300 patents to his name. 76 of these 
patents were filed in the US by the Telefunken Company for which he consulted. 
Telefunken built the Wuerzburg radar sets which used  most of H. E. Hollmann's inventions.  
Working in his company "Laboratory for High Frequency and Electromedecine," which 
employed 20 scientists, Hollmann developed the high frequency technology which led to 
the development of radar. 

Two men, von Willisen and Paul Erbsloeh had founded the GEMA Company.
In Erbsloeh's memoirs about von Willisen he writes, "With much work we were able to
make the magnetron oscillate at 50 cm. The modulation at other frequencies with sound
reception was made possible with the push-pull Barkhausen tubes from Hollmann."
"Hollmann was our consultant and based on his experience measuring the heaviside layer
he used pulsed modulation and used a CRT for all displays. At first the Marines were not
enthusiastic about using the CRT aboard ships, but it was demonstrated that this was only
right thing to do." 


Hollmann invented a large number of early magnetrons which can be seen by clicking on 
magnetrons. Most of the radar sets built throughout the world, during the 1930's and early 
1940's, used H.E. Hollmanns ideas which are documented in his patents.


The first modern Cathode Ray Tubes, CRTs, were invented and built by Manfred von Ardenne 
who was a close friend of Hollmann and who also had a research lab located in Lichterfelden, 
Berlin, across from Hollmann's lab. Click here to see his work on the CRT


In 1929, Watson Watt visited the Lichterfelde labs of Hollmann and von Ardenne and
purchased several hundred CRTs over the years.


In 1935, H. E. Hollmann wrote the first comprehensive books on microwaves.
The books are titled "Physics and Technique of Ultrashort Waves."
The books were used in all countries of the world and it fueled the development of radar in
all of the major countries in the world. His book showed examples of applications of
microwaves. These books are still available in most libraries around the world. Copies can
still be purchased, click here.

What others say In a book by R. Buderi "The Invention that Changed the World" it is stated 
that in 1935 the British read Hollmann's book in which his "assertion that cat's whisker crystals 
constituted the best high frequency detectors. Thus the British radar effort started fortuitously 
down the semiconductor path."S.S. Swords in his book "Technical history of the beginnings of 
RADAR" writes about the US radar effort, "It is pertinent to point out that microwave propagation 
tests continued into 1935 with the use of the German built Hollmann valves (retarding field tubes)."
In another book by L. Brown "A Radar History of World War II" it is stated that Hollmann's book 
"Physics and Technique of Ultrashort Waves" became the ultimate authority for microwaves until 
the end of the decade." He also writes about Hollmann as being "Germany's - and until recently 
Europe's - leading microwave specialist."

In addition to writing his famous two volume books on "Physics and Technique of Ultrashort 
Waves," he also wrote over 100 articles in the field of VHF. A list of these is shown in 
Publications.


After WWII he and his family came to the USA under "operation paper clip."  
The secret service documented his life's work which can be reviewed under 
Resume.

Stephanie is youngest radio amateur in the UK

Saturday, February 13, 2010


STEPHANIE Gregory is all EARS – and she couldn’t be happier she’s making waves.

The bubbly seven-year-old is the youngest licensed radio amateur in the United Kingdom. And it’s all down to the help and support she’s been given as a member of the Elderslie Amateur Radio Society (EARS). Stephanie has just passed her amateur radio exams which means she no longer has to operate from the r dio club under supervision. She told the Paisley Daily Express: “I have been coming come to the meetings with my dad for a while now and I used to watch what he was doing. “It looked like good fun so I asked if I could have a go. I thought it was brilliant.
“I’ve now been doing it since August and I thought it would be good if I could become a member of the same club.” However that meant sitting the full-blown radio amateur exam, although thanks to the hard work of club chairman Eddie Higgins, the club is now a qualified test centre.
Stephanie, a pupil at Wallace Primary School, said: “I asked if I could sit my exam and was told that would be okay. “I eventually passed the exam and I was delighted. “I don’t have my own radio yet but I can still talk to people while I’m at the club. “And my dad’s got a radio in the car so I get to use that as well. It’s brilliant fun.” Stephanie’s dad Miah, who is treasurer of EARS, has been broadcasting over the airwaves for a couple of years now. And the 29-year-old software engineer wasn’t at all surprised by his daughter’s enthusiasm. He said: “Stephanie has always shown an interest in things like radios, so I was half waiting for her to ask the question.
“She has her head screwed on the right way and likes to learn new tricks by playing around with things.” EARS founder, Eddie Higgins, said: “Stephanie studied really hard for her foundation radio amateur exam both at the Elderslie club and at home with her dad and, to be honest, it wasn’t a massive shock when she passed. “She might only be seven but she worked incredibly hard to prepare for the exam – and it paid off. “Initially, she was a little 'microphone shy' although she was soon ‘on air’ and rambling on about her experiences at school and how much fun she was having. “On behalf of everyone at the club, I would just like to say a big congratulations to Stephanie.” But not only has the bright spark become the country’s youngest radio amateur, she was recently presented with the Bill Robertson trophy for outstanding achievements at the club’s AGM. EARS transmit from the Elderslie Village Hall on Thursday evenings. For more info, contact Eddie Higgins on 0141 889 5597. The club also specialise in providing training for people with special needs.

Monday, February 1, 2010

SUNSPOT 1043 emerged in the sun's 
northern hemisphere--and it continues 
to grow today.


Andres Muner
Image taken: JAN. 31, 2010
Location: Rosenheim, Bavaria, Germany
Details: Fast Growing Sunspot 1043 in Cak, White Light and Ha.










Coronal Holes

A solar wind stream flowing from the indicated 
coronal hole should reach Earth on or about Feb.10th. 
Credit: STEREO-B Extreme UV Telescope






Jo Dahlmans
Image taken: JAN. 31, 2010
Location: Ulestraten, The Netherlands
Detail: Active region 1043 is taking on a nice shape in my 150mm modified Coronado PST!