Nov 20, 2017
Last week the spacecraft maintained normal operations for its Outbound Cruise Phase. On Nov. 13, the spacecraft’s communications downlink rate decreased to 200 bps from 10 kbps. The spacecraft continues to communicate back to Earth through its low gain antenna (LGA).
On the ground this last week, the OSIRIS-REx Science Team gathered in Tucson, Ariz. for its bi-annual meeting. This meeting focused on further refining the science planning processes that will be implemented when the spacecraft arrives at Bennu.
Nov 13, 2017
OSIRIS-REx continued normal Outbound Cruise operations last week. As of today, the spacecraft is 57 million km from Bennu, traveling at 8 km/sec relative to Earth. The one-way light time for transmissions from the spacecraft back to the ground is 100 seconds, which is an increase of 15 seconds in the last week. The spacecraft’s communications downlink rate remains at 10 kbps.
Nov 06, 2017
Last week the spacecraft maintained normal operations for its Outbound Cruise Phase. OSIRIS-REx is currently 25.6 million km from Earth and is traveling at approximately 28,000 km/h relative to Earth. One-way light time for transmissions from the spacecraft back to the ground is 85 seconds.
Oct 30, 2017
This past week, the mission took advantage of the spacecraft’s long outbound cruise to study the spacecraft’s thermal profile. As part of the exercise, the spacecraft was placed into certain orientations that it will employ during asteroid proximity operations in order to more precisely determine the thermal properties of each part of the spacecraft. As different spacecraft components were exposed to the Sun, the team measured how quickly they warmed and cooled. This in-flight characterization of OSIRIS-REx’s thermal properties will help the team more accurately predict the spacecraft’s thermal state while the spacecraft is operating close to Bennu.
Back on Earth, the ground team continues to be busy planning spacecraft operations and science observations for Bennu proximity operations, which will begin in August 2018 and continue through sample collection, scheduled for July 2020.
Oct 23, 2017
As of Oct. 23, the OSIRIS-REx spacecraft is traveling at approximately 25,000 kph relative to Earth. The spacecraft is approximately 17 million km from Earth and 57.7 million km from Bennu. But because Bennu is orbiting around the Sun and isn’t stationary, the spacecraft must still travel 948 million km before it can catch up to the asteroid.
On Oct. 16, the spacecraft’s communications downlink rate decreased to 10 kbps. Because of the low data rates and other mission planning activities, no science observations are planned through Jan. 7, 2018.
Oct 16, 2017
Last week, the OSIRIS-REx spacecraft continued on its new post-EGA trajectory toward Bennu. A REXIS Solar X-Ray Monitor testing and calibration activity began Oct. 9 and ran through Oct. 12. On Oct. 7, the spacecraft’s communications downlink rate decreased to 40 kbps from 200 kbps. The spacecraft continues to communicate back to Earth through its low gain antenna (LGA).
As of Oct. 16, the OSIRIS-REx spacecraft is approximately 12.9 million km from Earth and has traveled around 1.03 billion miles since launch. It has another 970 million km to travel before it reaches Bennu.
Oct 09, 2017
The mission’s instrument teams and science working groups continue to actively process EGA science observations for the OCAMS, OVIRS, OTES and TAGCAMS instruments. Early indications show outstanding performance of the instruments, giving confidence that they will operate as designed at Bennu. Although the EGA maneuver and subsequent observations went smoothly overall, the science operations team is looking at lessons learned from EGA on both planning and ground tools to assess whether there are further improvements that could be made for Bennu operations.
As of Oct. 9, the OSIRIS-REx spacecraft is approximately 8.8 million km from Earth and its one-way light time is around 30 seconds.
Oct 02, 2017
Following a successful Earth Gravity Assist on Sept. 22, the spacecraft engaged its OCAMS and TAGCAMS cameras and OTES and OVIRS spectrometers on Sept. 22, Sept. 25 and Sept. 28 to observe the Earth and Moon. The instruments operated nominally and the mission team was able to use the opportunity to exercise its science operations procedures and calibrate the spacecraft’s instruments. Images and spectra of Earth and images of the Earth and Moon were also released. A final day of observations is scheduled for Oct. 2.
The mission’s navigation team determined that the spacecraft’s post-EGA trajectory was on course as planned. As a result, the trajectory correction maneuver (TCM-6) scheduled for Oct. 4 was cancelled.
Sep 25, 2017
On Friday, the OSIRIS-REx spacecraft completed its planned Earth Gravity Assist.
Sep 18, 2017
Last week, the OSIRIS-REx spacecraft maintained nominal operations as it continued on a trajectory toward Earth for its scheduled Sept. 22 Earth Gravity Assist (EGA). On Sept. 14, the spacecraft’s communications downlink rate increased to 300 kbps from 200 kbps as the spacecraft’s distance to Earth continues to shrink. The spacecraft is currently communicating through its low gain antenna (LGA).
As of Sept. 18, the spacecraft is 2.6 million km from Earth and its one-way light time is around 9 seconds.