OrbitalHub

Credits: ESA-AOES Medialab

The Soil Moisture and Ocean Salinity (SMOS) mission, which is the second Earth Explorer Opportunity mission to be developed as part of ESA’s Living Planet Program, will provide global maps of moisture over the Earth’s landmasses and salinity over the oceans. These observations will improve our understanding of hydrology and ocean circulation patterns.

The science objectives for the SMOS mission are global monitoring of surface soil moisture and surface salinity over oceans, and improving the characterization of ice and snow-covered surfaces.

The SMOS satellite is built around a standard spacecraft bus called Proteus, which was developed by the French space agency CNES (Centre National d’Etudes Spatiales) and Alcatel Alenia Space. Proteus measures one cubic meter and plays the role of a service module, hosting all the subsystems that are required for the satellite to function.

A GPS receiver collects satellite position information. A hydrazine monopropellant system consisting of four 1-Newton thrusters, which are mounted on the base of the spacecraft, provides the thrust for orbit control. Three 2-axis gyroscopes and four small reaction wheels control the attitude of the satellite. A star tracker also provides accurate attitude information for instrument measurements.

The solar panels can produce up to 900 W, covering the 525 W maximum payload consumption. During eclipse periods, the satellite uses a 78 AH Li-ion battery. SMOS has a launch mass of 658 kg: a 275 kg platform, 355 kg payload, and 28 kg of fuel.

The SMOS satellite will deploy a new type of scientific instrument in space: a microwave imaging radiometer that operates between 1,400 – 1,427 MHz (L-band). The instrument is called Microwave Imaging Radiometer using Aperture Synthesis, or MIRAS, for short. MIRAS consists of a central structure and three deployable arms, and uses 69 antenna-receivers (LICEFs) for measuring microwave radiation emitted from the surface of the Earth. The instrument is the result of almost ten years of research and development.

Credits: ESA-AOES Medialab

The data collected by MIRAS needs to go through a validation process. The radiation received by the instrument is a function that depends not only on soil moisture and ocean salinity, other effects need to be considered when instrument data is converted into units of salinity and moisture.

Factors that have to be considered are the distribution of vegetation, the litter layer, the soil type, the varying roughness of the surface, and the physical temperature of the surface of the land and sea.

In order to quantify the effects of factors mentioned above, dedicated campaign activities were conducted. Ground-based and airborne instruments similar to the one mounted on SMOS were used to collect data that was correlated with in-situ observations made by large ground teams. Long-term observations were carried out from an oilrig platform in the Mediterranean and at the Concordia Station in Antarctica.

The Committee on Earth Observation Satellites (CEOS) has defined a number of levels for the SMOS Mission Data Products. They range from Raw Data to Level-3 Data Products, which are Soil Moisture and Ocean Salinity global maps. Level-3 data will be available from the SMOS Level 3/4 Processing Center in Spain.

Eurockot will provide the launch services for the SMOS mission. A Rockot launcher, which is derived from a Russian Intercontinental Ballistic Missile (ICBM) SS-19, will lift off from the Plesetsk Cosmodrome, 800 km north of Moscow. The Rockot launcher will inject the satellite in a 758 km quasi-circular orbit.

The CNES Satellite Operations Ground Segment and ESA/CDTI (Centro para el Desarrollo Technologico Industrial) Data Processing Ground Segment will be responsible for the SMOS mission ground segment.

Initially scheduled for 2008, the launch of the Earth Explorer SMOS satellite will take place some time from July to October 2009.

You can find more details about SMOS on the dedicated page on ESA’s web site.

The Lunar Reconnaissance Orbiter (LRO) and the Lunar Crater Observation and Sensing Satellite (LCROSS) launched aboard an Atlas V launch vehicle from Cape Canaveral Air Force Station in Florida on June 18, 2009 at 5:32 PM EDT.

Read more about LRO and LCROSS…

NASA’s return to the Moon requires careful preparation. Finding safe landing sites, locating potential resources, and taking measurements of the radiation environment are some of the tasks the Lunar Reconnaissance Orbiter (LRO) spacecraft will perform while in lunar orbit. LRO is an unmanned mission that will create a comprehensive atlas of the moon’s surface and resources.

Read more about LRO…

NASA will launch another lunar scouting spacecraft on the same Atlas V rocket with Lunar Reconnaissance Orbiter (LRO): the Lunar Crater Observation and Sensing Satellite (LCROSS). This mission is not a typical scouting mission.

In 1999, a precursor of LRO and LCROSS called the Lunar Prospector detected traces of concentrated hydrogen at the lunar poles. As a result, the LCROSS mission\’s main goal is to confirm the presence or absence of water in a permanently shadowed crater near a lunar polar region. At the present time, landing a probe on the lunar surface and performing excavations or drilling would be very expensive. A less expensive solution for the LCROSS mission is to use a kinetic impactor to excavate a crater on the surface of the Moon.

Read more about LCROSS…

Credits: NASA

Carnival of Space #107 is live at Innumerable Worlds.

This week you can read about the search for planets in the Alpha Centauri system, Comet C/2008 Q3 Garrad, why we did not find any organic material on Mars, the Apollo 11 moon landing, an alternative design for a space elevator, the current status of the Orion spacecraft, and much more.

Credits: ESA

The Kennedy Space Center has officially welcomed Node 3. Node 3 is a European-built module for the International Space Station (ISS). The prime contractor chosen for the job was Thales Alenia Space, in Turin, Italy.

Node 3 was transported from Italy by an Airbus Beluga aircraft. The aircraft left Turin on May 17, and arrived in Florida on May 20.

Node 3 is now being prepared for the journey to the ISS in the Space Station Processing Facility (SSPF) at KSC.

Node 3 is a connecting module. With a length of 6.7 m and 4.4 m in diameter, Node 3 will have a total mass of 19,000 kg once berthed to the ISS. Node 3 will eventually house the life support system necessary for the permanent crew of six on the space station. On one of its berthing ports, Node 3 will accommodate the Cupola. Node 3 also provides room for eight refrigerator-size racks. Two of these racks will be used by avionics systems controlling the node.

Credits: ESA

Cupola is an observation module. Once attached to Node 3, it will provide a pressurized observation and work area for two ISS crew members. Cupola will allow the crew to control the space station remote manipulator system through the robotic workstation. Cupola has a mass of 1,880 kg, a height of 1.5 m, and it has a maximum diameter of 2.9 m. The windows are protected by a Micro-meteorid and orbital Debris Protection System (MDPS), which consists of shutters made out of aluminum coated with Kevlar.

Node 3 will be launched inside the Orbiter cargo bay, mounted on a pallet via a Manual Berthing Mechanism, and transferred to the Node location using the Shuttle Remote Manipulator System.

“Node 3 represents a turning point for the International Space Station,” said Simonetta Di Pippo, ESA Director of Human Spaceflight. “By having accomplished the development of the ISS modules and by completing its assembly in the months to come we open a new avenue of cooperation and exploration that will take humankind back to the Moon and beyond to other destinations while continuing to exploit the enormous possibilities in low Earth orbit.”

Credits: ESA

NASA has chosen the name Tranquility for Node 3, after the Sea of Tranquility, landing site of Apollo 11 in 1969. Colbert had to settle for having one of the treadmills onboard ISS named after him.

Node 3 and Cupola are scheduled to be delivered to the ISS by STS-130 Space Shuttle Endeavour in early 2010.

You can find out more about Node 3 and Cupola on the page dedicated to the ISS on ESA’s web site.