Tuesday, November 25, 2008
The International Space Station Celebrates Its 10th Birthday
Monday, April 28, 2008
Full Earth-Rise
Image Taking of “Full Earth-Rise” by HDTV
Japan Aerospace Exploration Agency (JAXA)
Japan Broadcasting Corporation (NHK)
The Japan Aerospace Exploration Agency (JAXA) and NHK (Japan Broadcasting Corporation) successfully captured a movie of the "Full Earth-Rise"*1 using the onboard High Definition Television (HDTV) of the lunar explorer "KAGUYA " (SELENE) on April 6, 2008 (Japan Standard Time, JST, all the following dates and time are JST.) The KAGUYA is currently flying in a lunar orbit at an altitude of about 100 km.
An "Earth-rise," or the rising Earth over the Moon, was first captured by the Apollo project. The Earth rising image taken by the KAGUYA on November 7, 2007, was not a full Earth-rise (i.e. not all of the globe was seen in shining blue.) It missed some part. This time, a "full Earth-rise"*1 was taken by the onboard HDTV in faraway space, some 380,000 km away from the Earth. This is the world's first successful shooting of such a Full Earth-Rise. It was also very precious because it was one of only two chances in a year for the KAGUYA to capture a Full Earth-Rise when the orbits of the Moon, the Earth, the Sun and the KAGUYA are all lined up.
The shooting was performed by the KAGUYA's onboard HDTV for space use, which was developed by NHK. The movie data was received at JAXA, then processed by NHK.
*1 The phenomenon expressed as a "Full Earth-Rise" can be seen from a satellite that travels around the Moon such as the KAGUYA (SELENE) or the Apollo manned spacecraft. The Earth is almost stationary when it is observed from the Moon, thus a Full Earth-Rise coming out from the horizon cannot be seen from the Moon.
Full Earth-rise taken by HDTV (Tele camera)
The location on the Moon is around the South Pole on the back side at a south latitude of 83 degrees or higher. You can see the North American Continent on the image of the earth on the lower left and Pacific Ocean in the center. (The top of the image is the south of the Earth, thus the North American Continent is seen upside down.)
The image below shows the Earth rising from the Moon's horizon. It took about 40 seconds from the left image to the right.
The above figure shows the relative positions of the Sun, Earth, Moon and the KAGUYA by setting the Sun at the center viewing from the North. Black arrows indicate the KAGUYA's orbit around the Moon, and red arrows are the KAGUYA's moving direction. The green arrows show the Earth's revolving direction around the Sun. "Yaw around" is an attitude control maneuver to change the KAGUYA's moving direction by using its thruster for attitude control to face the solar array paddle toward the Sun. On April 3, we performed the yaw around, and the KAGUYA is now flying toward +X direction (forward direction,) which is 180 degrees around the original direction when the KAGUYA was launched (-X direction or backward direction.) Through the yaw around maneuver, the HDTV tele camera faces toward the moving direction.
Figure 2: Position of HDTV
: |
| Location | Start of image shooting (JST) | Completion of image shooting | Starting location | Finishing location |
| Plateau | at 4:41 p.m. on Feb. 25 | 4:49 p.m. | N lat. 78 deg. E long. around 339 to 5 deg. | N lat. 54 deg. E long. around 347 to 355 deg. |
| Pythagoras | 2: 56 p.m. on Feb. 29 | 3:04 p.m. | N lat. 81 deg. E long. around 279 to 315 | N lat. 57 deg. E long. around 294 to 303 deg. |
| Mare Humboldtianum | 7:33 p.m. on March 16 | 7:41 p.m. | N lat. 75 deg. E long. around 73 to 93 deg. | N lat. 51 deg. E long. around 88 to 89 deg. |
| Mare Serenitatis (Sea of Serenity) South area | 9:13 a.m. on March 22 | 9:21 a.m. | N lat. 19 deg. E long. around 10 to 16 deg. | S lat. 5 deg. E long. around 9 to 15 deg. |
| Full Earth-set | 12:15 p.m. on April 5 | 12:19 p.m. | N lat. 86 to 87 deg. E long. around 118 to 259 deg. | N lat. 76 deg. E long. around 176 to 199 deg. |
| Full Earth-rise | 6:44 a.m. on April 6 | 6:45 a.m. | S lat. 82 to 83 deg. E long. around 152 to 194 deg. | S lat. 85 to 86 deg. E long. around 134 to 209 deg. |
* The above images are all publicized in the JAXA Digital Archives.
| HDTV | |
| CCD(1920×1080: valid pxcels) 3 chips Three primary colors spectrum by Dichroic Prism Fixed lenses (T: tele camera, W: wide camera) T: 51.23°(horizontal) 30.17°(vertical) W: 15.60°(horizontal) 8.80°(vertical) |
Thursday, April 10, 2008
Space Exploration
| First South Korean sent into space | ||
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Space Exploration
The Future Of Space Exploration?
Black smoke belches out of a grinding old engine as it hauls Russia's latest Soyuz space capsule across a Kazakh wasteland, while armed guards keep watch. This mixture of high and low technology is probably the future of space exploration, as resources get scarcer and more small governments and independent operators get into the space game. More images of Soyuz in the wasteland, and its launch to the International Space Station, below:
A Russian police officer guards the Russian Soyuz TMA-12 space ship that will carry a new crew to the international space station as the rocket is transported to the launch pad at the Baikonur Cosmodrome, Kazakhstan, Sunday, April 6, 2008. The rocket is scheduled to blast off on Tuesday, April 8. (AP Photo/Dmitry Lovetsky)
Russian police officers guard the Russian Soyuz TMA-12 space ship that will carry a new crew to the international space station as the rocket is transported to the launch pad at the Baikonur Cosmodrome, Kazakhstan, Sunday, April 6, 2008. The mission is expected to ferry two Russian cosmonauts and a South Korean graduate student to the International Space Station. The rocket is scheduled to blast off on Tuesday, April 8. (AP Photo/Dmitry Lovetsky)
Friday, April 04, 2008
ATV Jules Verne Docks with Station
Image to right: The Jules Verne Automated Transfer Vehicle approaches the aft port of the International Space Station's Zvezda Service Module for docking. Image credit: NASA TV
The unpiloted cargo spacecraft carries more than 7,500 pounds of equipment, supplies, water, fuel and gases for the station.
It also carries hopes and aspirations of the European Space Agency. The ATV and its advanced rendezvous system could play an important role in future space exploration.
The Jules Verne docked smoothly using its automated, laser guided rendezvous system. It was in many respects a repeat of the dry run on Monday. That practice approach brought the ATV to within 36 feet of the docking port.
The Jules Verne launched from Kourou, French Guiana, on an Ariane 5 rocket on March 9.
Solar arrays deployed as planned after two engine firings more than an hour and a half after launch. That placed the ATV in a parking orbit about 1,200 miles from the station.
It was, at almost 22 tons, the largest payload ever launched by the Ariane 5.
The Jules Verne is named after the acclaimed French science-fiction author. It is the first of perhaps seven such spacecraft to be built.
The ATV can carry about three times the cargo weight carried by the Progress, the reliable Russian unpiloted cargo carrier.
The Jules Verne initially was placed in an orbit a safe distance from the station, where a series of tests were performed. Among the last of the tests were two approaches to the station.
Those approaches ended in "escape" maneuvers, to verify a collision avoidance system. It would be used if the ATV automated docking system should fail.
The spacecraft is scheduled to remain at the station until August, for unloading and to reboost the orbiting laboratory. Subsequently it will be filled with station garbage and discards. Then it will be deorbited for destruction on re-entry over the Pacific.
Europe’s automated ship docks to the ISS
Jules Verne ATV docking |
ESA PR 20-2008. ATV Jules Verne, the European Space Agency’s first resupply and reboost vehicle, has successfully performed a fully automated docking with the International Space Station (ISS). This docking marks the beginning of Jules Verne’s main servicing mission to deliver cargo, propellant, water, oxygen and propulsion capacity to the Station, as well as ESA’s entry into the restricted club of the partners able to access the orbital facility by their own means.
The 19-ton unmanned spaceship manoeuvred from a holding position 39 km behind the 275-ton space outpost and conducted a 4-hour staged approach with several stops at reference points for checks. It autonomously computed its own position through relative GPS (comparison between data collected by GPS receivers both on the ATV and the ISS) and in close range it used videometers pointed at laser retroreflectors on the ISS to determine its distance and orientation relative to its target. Final approach was at a relative velocity of 7 cm/s and with an accuracy of less than 10 cm, while both the ATV and the ISS were orbiting at about 28000 km/h, some 340 km above the Eastern Mediterranean. ATV Jules Verne’s docking probe was captured by the docking cone at the aft end of Russia’s Zvezda module at 16:45 CEST (14:45 GMT). Docking was completed with hooks closing at 16:52 CEST (14:52 GMT).
First automated docking
This is the very first time in Europe that an automated docking is performed in due respect of the very tight safety constraints imposed by manned spaceflight operations. All the approach and docking phase was piloted by the ATV’s onboard computers under close monitoring by the teams of ESA, CNES (the French Space agency) and Astrium (the prime contractor) at the ATV Control Centre at CNES Toulouse, France, as well as the ISS crew inside the Zvezda module. In case of anomaly, both ends could trigger pre-programmed manoeuvres to hold position, retreat to the previous reference point or escape to a safe distance.
The ATV’s behaviour was also under surveillance from its own independent Monitoring & Safing Unit (MSU), which uses a separate set of sensors and computers to check that the approach manoeuvre is conducted safely. In case of major anomaly, the MSU would have been able to take over the commands and order a Collision Avoidance Manoeuvre (CAM) through dedicated avionics chains and thrusters.
As all operations went smoothly, none of these safety manoeuvres was required during this afternoon’s approach and docking.
Replay of Ariane 5 ES-ATV launch |
New delivery service
Now that it is docked, the ATV Jules Verne will become an additional module of the ISS for about four months. The astronauts will enter its pressurized cargo module and retrieve 1,150 kg of dry cargo, including food, clothes and equipment as well as two original manuscripts handwritten by Jules Verne and a XIXth century illustrated edition of his novel “From the Earth to the Moon”. In addition, they will pump 856 kg of propellant, 270 kg of drinking water and 21 kg of oxygen into Zvezda’s tanks. The ATV can carry about three times as much payload as Russia’s Progress freighters but on this mission, most of it is actually propellant to be used by the ATV’s own propulsion system for periodical manoeuvres to increase the altitude of the ISS in order to compensate its natural decay caused by atmospheric drag. If required, the ATV will also be able to provide redundant attitude control to the ISS or even perform evasive manoeuvres to move the Station out of the way of potentially dangerous space debris. The first of ATV Jules Verne’s reboost manoeuvres is currently scheduled on 21 April.
ESA DG and dignitaries at ATV-CC |
“The docking of the ATV is a new and spectacular step in the demonstration of European capabilities on the international scene of space exploration ”said Jean-Jacques Dordain, ESA’s Director General. “This fantastic step is in first instance the result of collective work in Europe, including ESA Member States, industry under Astrium as prime contractor, CNES and ESA staff as well as among ISS partners, in particular the USA and Russia. We shall now reap the benefits of such investments after the launch of ESA’s Columbus laboratory, first in utilizing the unique capabilities of the ISS and secondly in preparing for the exploration of the Solar System. Now that the ATV is "up and running", I am happy to announce that in the next few weeks ESA will launch a recruitment campaign to hire new European astronauts"
For further information:
ESA Media Relations Office
Communication and Knowledge Department
Tel: + 33 1 5369 7299
Fax: + 33 1 5369 7690
