Tag: Advanced Space

UAE asteroid mission will rendezvous with seven asteroids and will include lander

10:08 am

Though the mission was first announced in 2021, the UAE only recently revealed at a science conference the mission’s specific targets and plan.

From the conference poster [pdf]:

The mission will launch in 2028 and visit 7 main belt asteroids, including 6 high-speed flyby encounters en route to a rendezvous with the asteroid 269 Justitia. The mission is enabled by solar electric propulsion and gravity assist flybys of Venus, Earth, and Mars, bringing the total number of mission encounters to 10. The trajectory design presented will include the overall timeline of the mission, launch targets, launch period, overall duration of the encounters, design of the encounters, and trajectory modeling. Mission design analyses include designing the Deep space maneuvers (DSMs) prior to the rendezvous with Justitia and design Justitia’s orbits and maneuvers to accomplish the lander deployment.

As with the UAE’s Al-Amal Mars Orbiter, the country is relying on an American university, the University of Colorado, as well as the commercial company, Advanced Space, to design, build, and operate the spacecraft. In this sense the UAE is paying these American entities to fly the mission while requiring them to train its own engineers and scientists.

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Update on lunar orbiter CAPSTONE

1:58 pm

Link here. The update comes from Advanced Space, the commercial company tasked by NASA with operating the orbiter, whose main goal its to test operations in the type of orbit around the Moon that NASA plans to put its Lunar Gateway space station, dubbed a Near Rectilinear Halo Orbit (NRHO).

Thus far, since performing the NRHO insertion maneuver on November 13th, 2022, the spacecraft has spent 154 days operating in the NRHO completing 23 NRHO revolutions. During this time, the mission team has maintained knowledge of the spacecraft state well within the mission requirements using ground-based navigation tools and tracking measurements collected by the Deep Space Network including DSS-17 which is an affiliated site at Morehead State University in Kentucky. This navigation information has continued to support the design and execution of required maneuvers to maintain the orbit.

Minimum maneuver size constraints have been sequentially reduced as the combined mission operations teams at Advanced Space, Terran Orbital, and Stellar Exploration continue to mitigate issues with a thruster valve. Since entering the NRHO the spacecraft has executed six Orbit Maintenance Maneuvers (OMM) using approximately 1.8 m/s of fuel. Although the mission plan was originally to do a maneuver every NRHO (approximately once a week), the higher burn threshold has reduced the number of maneuvers performed while also demonstrating the robustness of the stationkeeping strategy utilized by the mission which is the same strategy planned for the Lunar Gateway.

CAPSTONE’s primary mission ends in May, but it will continue on an extended mission for twelve more months.

Though CAPSTONE has provided NASA important orbital data for maintaining Lunar Gateway in lunar orbit, the orbiter’s biggest achievement is its commercial nature. NASA hired Terran Orbital to build it, Rocket Lab to launch it, and Advanced Space to operate it. There was relatively little government participation. Moreover, this privately-run project has demonstrated that an inexpensive smallsat can quickly accomplish the same things that once only big expensive satellites attempted.

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Update on CAPSTONE in lunar orbit

8:58 pm

Link here. The key takeaway is that this commercial privately built and operated lunar smallsat is doing what it was designed to do, even as its operators continue to overcome periodic technical problems.

For example, beginning January 26th the spacecraft stopped receiving commands from ground controllers. The problem solved itself when on February 6th “an automatic command-loss timer rebooted” the spacecraft. Meanwhile,

CAPSTONE has completed more than 12 orbits in its near-rectilinear halo orbit – the same orbit [that will be used by Lunar] Gateway – surpassing one of the mission’s objectives to achieve at least six orbits. The mission team has performed two orbit maintenance maneuvers in this time. These maneuvers were originally scheduled to happen once per orbit, but the mission team was able to reduce the frequency while maintaining the correct orbit. This reduces risk and complexity for the mission and informs plans for future spacecraft flying in this orbit, like Gateway.

Essentially, mission controllers are figuring out the best and most efficient methods for eventually maintaining Lunar Gateway’s orbit around the Moon, when it gets there.

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CAPSTONE enters its planned lunar orbit

9:21 am

After experiencing serious tumbling shortly after launch, engineers have successfully put the technology test smallsat CAPSTONE into its planned lunar orbit (the same to be used by NASA’s Lunar Gateway space station), where it will spend at least six months gathering data.

In addition to studying this unique orbit, CAPSTONE’s mission also includes two technology demonstrations that could be used by future spacecraft. The Cislunar Autonomous Positioning System, or CAPS, is a navigational software developed by Advanced Space that would allow spacecraft operating near the Moon to determine their position in space without relying exclusively on tracking from Earth. CAPSTONE will demonstrate this technology by communicating directly with NASA’s Lunar Reconnaissance Orbiter, which has been in orbit around the Moon since 2009. CAPSTONE will also demonstrate one-way ranging using a chip-scale atomic clock, which could allow spacecraft to determine their position in space without the need for a dedicated downlink to ground stations.

CAPSTONE is also demonstrating a third technology as well as the use of capitalism in space. The third technology is demonstrating the viability of using a tiny inexpensive smallsat for these kinds of interplanetary missions. The capitalism is that CAPSTONE was built by a private company, Terran Orbital, not NASA, and is being operated by another private company, Advanced Space, not NASA. It was also launched by a private company, Rocket Lab, not NASA. All three have proved or are proving that it is faster and cheaper for the government to merely act as the customer to private enterprise, rather than being the builder/operator and boss.

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CAPSTONE successfully enters lunar orbit

10:17 pm

CAPSTONE successfully entered orbit around the Moon today, putting it into the planned Lunar Gateway halo orbit to test operations in that location.

CAPSTONE is now in a near-rectilinear halo orbit, or NRHO. This particular NRHO is the same orbit that will be used by Gateway, the Moon-orbiting space station that will support NASA’s Artemis missions. CAPSTONE is the first spacecraft to fly an NRHO, and the first CubeSat to operate at the Moon.

Mission engineers plan two more engine burns over the next five days to refine the orbit more precisely.

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Advanced Space wins lunar orbiter contract with Air Force

9:21 am

Advanced Space, the company that is presently running the CAPSTONE mission that will arrive in lunar orbit on November 13th, has won a $72 million contract with the Air Force Research Laboratory to build and operate a new experimental lunar orbiter.

The mission, dubbed Oracle, is targeting a 2025 launch and will operate in lunar orbit for two years.

“Our primary goals for the program are to advance techniques to detect previously unknown objects through search and discovery, to detect small or distant objects, and to study spacecraft positioning and navigation in the XGEO realm,” said James Frith, the principal investigator. XGEO refers to the space beyond geosynchronous orbit out to the moon. Oracle will operate in the vicinity of Earth-moon Lagrange Point 1, about 200,000 miles from Earth. The GEO belt, by comparison, is about 22,000 miles above Earth.

An additional goal of Oracle is to help mature AFRL’s green propellant technology. “While there are no specific plans yet to refuel Oracle, AFRL wants to encourage civil and commercial development of on-orbit refueling services,” said Frith.

The federal government’s transition from the building rockets, spacecraft, and satellites to simply buying them from the private sector continues. In the past, when the Air Force attempted to design and build everything, a project like this would have cost at least five times more and taken two to five times longer to get launched. Now, it hires Advanced Space to do it, and gets what it wants quickly for lower cost.

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Engineers regain full control of CAPSTONE

9:21 pm

After a month of careful tests and analysis, engineers today successfully regained full control of the CAPSTONE lunar orbiter, on its way to the Moon.

The most likely cause of the anomaly was identified as a valve related issue on one of the spacecraft’s eight (8) thrusters. The partially open valve resulted in thrust from the associated thruster whenever the propulsion system was pressurized. To attempt a recovery from this condition, the mission team conducted multiple tests on the vehicle and evaluated extensive telemetry and simulation data and then formulated a plan for attempting recovery of the vehicle’s full 3-axis control.

This recovery sequence was uploaded to the spacecraft yesterday (Thursday) and was executed early this morning (Friday 10/7). Initial telemetry and observation data after the recovery attempt points to a successful recovery of the system which has now regained 3-axis attitude control. The updated spacecraft attitude has oriented the spacecraft solar arrays to the Sun and implemented an orientation for the downlink antennas which significantly improves data downlink performance as compared to the pre-recovery attitude.

The spacecraft is not out of the woods yet. The engineers still need to figure out how to do future course corrections with “the possible presence of a valve that remains partially open.”

Nonetheless, that they have successfully regained full control means they have a very good handle on the issue, which bodes well for the lunar orbital insertion maneuver on November 13, 2022.

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CAPSTONE update: Situation improved but not resolved

9:13 am

Advanced Space, the company operating the CAPSTONE smallsat lunar orbiter that is on the way to the Moon, has issued a hopeful update on the efforts to regain full control of the spacecraft after it began tumbling out-of-control on September 8th.

The communications situation has dramatically improved, the power state of the spacecraft appears to be sufficient for continuous (duty cycled) heating of the propulsion system which dropped below its operational temperature, Over the past few days, CAPSTONE’s power – though limited by the orientation of the spacecraft in its spin relative to the Sun – appears to be sufficient for heating of the propulsion system. When the spacecraft propulsion system temps are at +5C for 12+ hours the system will be further evaluated for use in the recovery operation. Information on the cause of the anomaly has been obtained and is being evaluated, and recovery plans that mitigate risk of further anomalous behavior are being developed. We do not have a timeline for a recovery attempt.

It appears they have not yet done the detumble maneuver that the engineers think will bring the spacecraft back to nominal operations. However, the spacecraft appears to also be on its planned course towards the Moon, so all signs suggest a full recovery is likely.

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Update on CAPSTONE, still in safe mode

8:57 am

According to a detailed update from Advanced Space, the private company operating CAPSTONE for NASA, engineers have partly recovered control of the spacecraft after an anomaly had caused it to tumble and lose power.

It appears the problem that occurred on September 8th near the end of an mid-course correction engine burn was more serious that NASA initially revealed. CAPSTONE was tumbling out-of-control, its use of power was exceeding the power the solar panels were generating (draining its batteries), and the computer was periodically rebooting.

Since then engineers at Advanced have managed to stabilize the tumbling so that the spacecraft’s batteries were gaining power rather than losing it. Communications were re-established and the computer was also stabilized so that the spacecraft was able to get into a good safe mode. It remains however in a poor orientation that limits communications, power, and prevents proper operations.

While work is ongoing to diagnose the cause of the anomaly, the team is preparing the spacecraft to attempt a detumble operation to regain attitude control of the vehicle. This detumble operation was successfully demonstrated after separation from the launch vehicle in July. A successful detumble will result in the vehicle resuming control of its orientation, orienting the solar panels to the Sun to fully charge the batteries of the power used during the detumble. The spacecraft will then orient to the ground and await further instructions.

When this operation will occur was not stated, but it certainly will take place as soon as possible.

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CAPSTONE completes mid-course correction

10:39 am

Engineers at Advanced Space today successfully completed CAPSTONE’s first mid-course correction, following a quick investigation that determined why communications with the probe was lost for almost a full day.

The communications blackout was apparently due to software issues and human error.

During [in-flight] commissioning of NASA’s CAPSTONE (short for Cislunar Autonomous Positioning System Technology Operations and Navigation Experiment) spacecraft, the Deep Space Network team noted inconsistent ranging data. While investigating this, the spacecraft operations team attempted to access diagnostic data on the spacecraft’s radio and sent an improperly formatted command that made the radio inoperable. The spacecraft fault detection system should have immediately rebooted the radio but did not because of a fault in the spacecraft flight software.

CAPSTONE’s autonomous flight software system eventually cleared the fault and brought the spacecraft back into communication with the ground, allowing the team to implement recovery procedures and begin commanding the spacecraft again.

All looks good for a November 13, 2022 arrival in lunar orbit.

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Having regained communications with CAPSTONE, engineers prepare for first mid-course burn

8:55 pm

Engineers are now preparing CAPSTONE for its first first mid-course engine burn, slightly late due to a loss of communications during the past two days.

The spacecraft is in good health and functioning properly.

The CAPSTONE team is still actively working to fully establish the root cause of the issue. Ground-based testing suggests the issue was triggered during commissioning activities of the communications system. The team will continue to evaluate the data leading up to the communications issue and monitor CAPSTONE’s status.

If all goes well, that engine burn will occur as early as 11:30 am (Eastern) on July 7th.

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Rocket Lab’s Photon completes course corrections, deploys CAPSTONE to Moon

8:45 am

Capitalism in space: Rocket Lab’s Photon upper stage successfully completed its seventh engine burn, putting NASA’s cubesat test lunar orbital on a path toward the Moon.

Following its launch on June 28, CAPSTONE orbited Earth attached to Rocket Lab’s Photon upper stage, which maneuvered CAPSTONE into position for its journey to the Moon. Over the past six days, Photon’s engines fired seven times at key moments to raise the orbit’s highest point to around 810,000 miles from Earth before releasing the CAPSTONE CubeSat on its ballistic lunar transfer trajectory to the Moon. The spacecraft is now being flown by the teams at Advanced Space and Terran Orbital. [emphasis mine]

From here on out CAPSTONE will use its own tiny thrusters to do any course corrections as it heads for an arrival in lunar orbit on November 13, 2022.

The highlighted words in the quote above are significant in and of themselves. The spacecraft is not being operated by NASA. In fact, other than paying for it, NASA has little to do with CAPSTONE. It was designed and built by Terran Orbital. It was launched by Rocket Lab. And it is now being controlled by Advanced Space, a private commercial company focused on providing in-space operations for others.

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New York Mets – September 24, 1969

6:01 pm

An evening pause: This pause was first posted by me back in 2011. As tonight is the fiftieth anniversary of that grand moment, I post it again, if only to remind the jaded and pessimistic youth of today that miracles really can happen. As I wrote then,

In 1969 the lowly New York Mets, doormats in the National League from the moment the team was created in 1962, came out of nowhere to win the pennant and the World Championship of baseball. … I and my friend Lloyd attended the game in which the Mets clinched first place in the National League Eastern Division. Below is video showing highlights of the game plus the final out, with the crowd pouring onto the field. Though you can’t see me, I am in that crowd, jumping for joy at this most unlikely sports miracle. There was no rioting, only happy fans chanting “We’re number one!” in exuberant disbelief.

And I still have that small piece of turf from Shea Stadium, collected on that night, proof that the unexpected and improbable is always possible.

The unlikeliness of the Mets championship in 1969 cannot be overstated. Before 1969, the team had never finished higher than next to last, each season losing more games than they won. Then, in 1969 they posted a 100-62 record, while coming from far back to overtake the favored Chicago Cubs for the pennant. Moreover, during that 1969 season all kinds of unusual things kept happening. To give just one example, they won a double header by scores of 1-0, with the pitcher in both games driving in the winning run.

As their first manager and Hall-of-Famer Casey Stengel would say, “You could look it up!”

In 1973 the Mets won the pennant again, following the motto “You gotta believe!” pushed by their relief pitcher Tug McGraw. McGraw was so right. Combine talent, dedication, hard work, and an unwavering belief that all things are possible, humans can sometimes do amazing things.

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Test cubesat to launch to Gateway lunar orbit

2:10 pm

NASA has awarded a $13.7 million contract to Advanced Systems to build a cubesat to test placement and operation in the orbit the agency wishes to place its Lunar Gateway space station.

The Cislunar Autonomous Positioning System Technology Operations and Navigation Experiment (CAPSTONE) is expected to be the first spacecraft to operate in a near rectilinear halo orbit around the Moon. In this unique orbit, the CubeSat will rotate together with the Moon as it orbits Earth and will pass as close as 1,000 miles and as far as 43,500 miles from the lunar surface.

The pathfinder mission represents a rapid lunar flight demonstration and could launch as early as December 2020. CAPSTONE will demonstrate how to enter into and operate in this orbit as well as test a new navigation capability. This information will help reduce logistical uncertainty for Gateway, as NASA and international partners work to ensure astronauts have safe access to the Moon’s surface. It will also provide a platform for science and technology demonstrations.

While proving the capability of cubesats for these unmanned planetary probes is all to the good, I must once again point out that making this orbit a way station on the way to the Moon actually makes it more difficult to get there. More fuel and equipment is required to transfer to the Moon once you are in Gateway’s planned orbit.

Based on our past experience with NASA boondoggles like this, Gateway will therefore act as a drag on future American lunar exploration. While other nations (China, India) will be landing on the surface, we will repeatedly find that our surface missions are delayed because of the added complexity of going from Earth to Gateway and then to the surface.

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