Tag Archives: cubesat

Cubesats heading to Mars complete first course correction

The two cubesats, MarCO-A and MarCO-B, that were launched with NASA’s InSight Mars lander, have both completed their first course corrections, the first ever done in interplanetary space by cubesats.

While MarCO-A corrected its course to Mars relatively smoothly, MarCO-B faced some unexpected challenges. Its maneuver was smaller due to a leaky thruster valve that engineers have been monitoring for the past several weeks. The leak creates small trajectory changes on its own. Engineers have factored in these nudges so that MarCO-B can still perform a trajectory correction maneuver. It will take several more weeks of tracking to refine these nudges so that MarCO-B can follow InSight on its cruise through space.

“We’re cautiously optimistic that MarCO-B can follow MarCO-A,” said Joel Krajewski of JPL, MarCO’s project manager. “But we wanted to take more time to understand the underlying issues before attempting the next course-correction maneuver.”

Once the MarCO team has analyzed data, they’ll know the size of follow-on maneuvers. Several more course corrections will be needed to reach the Red Planet.

Since these two cubesats are an engineering test, even MarCo-B’s fuel leak issue provides valuable information that will make future interplanetary missions more likely and viable.


China loses contact with one of two lunar cubesats

China has lost contact with one of the two test cubesats that were launched to the moon with their Queqiao Chang’e-4 communications satellite.

Though they continue to receive telemetry from one cubesat, without the second they will be unable to do the radio astronomy and interferometry experiments planned.

The interferometry experiments would have seen the observations made simultaneously by the DSLWP/Longjiang microsatellites to be combined. The test would be verification of technology for a constellation of small, low-frequency radio astronomy satellites that would emulate a telescope with a size equal to the maximum separation between the satellites.

The Chang’e-4 mission could however see some interferometry tests carried out, with Queqiao carrying the Netherlands-China Low-frequency Explorer (NCLE) astronomy instrument, and a Low Frequency Spectrometer (LFS) on the Chang’e-4 lander, which is expected to launch in November or December, following testing of Queqiao.

All is not lost. The cubesat that still functions has a camera, built in Saudi Arabia, and if it takes and successfully transmits any pictures this will be a cubesat landmark, the first interplanetary images ever taken by a cubesat.

Meanwhile, Queqiao Change’-4 is working as expected, laying the ground work for the launch of the Chang’e-4 lander later this year.


Russian student satellite hopes to be the brightest star in sky

A Russian student project hopes its cubesat satellite will become the brightest star in sky when it launches as a secondary payload on a Soyuz-2 rocket on July 14.

Once the small satellite is 370 miles into orbit, it will deploy a pyramid-shaped solar reflector that is designed to capture the sun’s rays and bounce them back to Earth, creating the effect of a twinkling star to Earthlings. The reflector will be 170 square feet, is reportedly 20 times thinner than human hair and is made of Mylar — a thin polymer material.

One goal is for the satellite to outshine naturally existing stars. Another is to evaluate how to brake satellites in orbit and de-orbit them. The Russian team of engineers and space enthusiasts also hope to generate interest in space exploration.

The mission was funded through a Russian crowdfunding website. While everyone is making a big deal about the satellite’s brightness, the engineering being tested to deploy the reflector, control it, and then deorbit the cubesat in a controlled manner is far more important. Up until recently most cubesats had somewhat limited capabilities, and were used almost exclusively to train students on satellite engineering. This mission joins many other recent missions in demonstrating that cubesats will soon be able to do almost anything much larger satellites do, and thus are economically more practically to launch.


LightSail successfully deploys solar sail

Engineers have confirmed that the cubesat prototype LightSail has successfully deployed its solar sails.

This is I think only the second time a solar sail has successfully deployed in space. More significant to me is the fact that it is the first time this kind of complex engineering test has been tried using a cubesat. If cubesats can begin to handle these kinds of tasks, unmanned satellite technology is going to take a gigantic leap forward.


LightSail back in business?

The Planetary Society’s solar sail engineering test called LightSail has re-established communications with the ground, allowing for the possibility that it can finally achieve its solar sail deployment, the main purpose of the mission.

I had previously reported that the sails had deployed, but a commenter correctly noted that only the panels have deployed, not the sails themselves, which need full battery power. The communications problem has been related to a battery charging problem. They are hoping that the batteries will get charged by mid-day today when they will try to deploy the sails.


Amateur astronomers can help a commercial space start-up by taking pictures of its cubesat SkyCube.

Amateur astronomers can help a commercial space start-up by taking pictures of its cubesat SkyCube in orbit.

The cubesate was launched from ISS last week, but has not operated as expected and they want to know why. Images would help.