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Forum:Satellites - Robotic Probes
Topic:Korea Pathfinder Lunar Orbiter (KPLO) Danuri
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Robert PearlmanKorea Aerospace Research Institute release
Danuri launches as scheduled

The Ministry of Science, ICT and Future Planning (Minister Jong-Ho Lee) dispatched the lunar probe 'Danuri' on August 5 (Fri) around 08:08 (local time on August 4 (Thursday) at 19:08) Cape Canaveral, Florida, USA. The space force base said it would launch as scheduled.

At the Danuri launch site, Cape Canaveral, the US Space Force Base successfully completed all pre-works such as functional check, fuel injection, and assembly with the launch vehicle for about a month.

Danuri will be separated from the projectile approximately 40 minutes after launch, and will communicate with the ground station for the first time approximately 20 minutes after launch (about 1 hour after launch).

After that, it is expected that the Korea Aerospace Research Institute (Director Sang-ryul Lee) will be able to check whether Danuri succeeded in entering the lunar transition trajectory at around 13:00 to 14:00 (5 to 6 hours after launch) by analyzing the launch vehicle separation information.

Robert PearlmanMinistry of Science and Technology release
Confirmation of normal performance of Danuri second trajectory correction operation

Korea Aerospace Research Institute carried out the second trajectory correction operation of Danuri as planned, around 5 p.m. on Friday, September 2nd.

The second trajectory correction maneuver is an essential process to minimize the fuel consumption required for Danuri's Earth-Moon navigation and to arrive on the moon normally in accordance with the mission schedule.

The Aerospace Research Institute was originally scheduled to confirm the final result of the second trajectory correction operation around 5 p.m. on September 4 (Sunday) through the analysis of the trajectory information for about 48 hours, but after about 25 hours, on September 3 (Saturday), around 6 p.m. they were able to confirm final success. The reason that we were able to confirm the final result sooner than expected is because, in addition to the analysis experience of the first trajectory correction operation, the trajectory information after the second trajectory correction operation came out almost identical to the predicted one.

As the second trajectory correction operation was successfully carried out, the originally planned next trajectory correction operation (September 16) will be omitted.

Robert PearlmanKorea Aerospace Research Institute (KARI) release
Danuri begins entering lunar mission orbit

The Ministry of Science and Technology and the Korea Aerospace Research Institute that launched the lunar orbiter Danuri announced that the first lunar orbit entry maneuver was being carried out at 2:45 a.m. on Dec. 17, 2022 (2:45 p.m. EST or 1945 GMT on Dec. 16).

Danuri flew a total of 5.94 million km (cumulative) along the Earth-Moon trajectory for about 4.5 months after launch on Aug. 5, and came close to a distance of about 108 km from the moon on Dec. 17. After that, from December 17th to December 28th, Danuri will go through a total of five mission orbit entry maneuvers* to settle in the lunar mission orbit (100km above the moon).

In particular, this first entry maneuver is the most important maneuver to ensure that Danuri is stably captured by the moon's gravity and does not pass the moon. During this process, the thruster must be operated for about 13 minutes to reduce the speed of Danuri from about 8,000 km/h to 7,500 km/h, while accurately reaching the target position. This is a highly difficult task to enter the Danuri (7,500-8,000 km/h), which moves faster than a bullet, into the orbit of the moon, which is moving at the speed of a bullet (about 3,600 km/h). The results of the first entry maneuver are scheduled to be drawn on Dec. 19 after data analysis. 

Afterwards, it will go through the second to fifth entry maneuvers (Dec. 21 to Dec. 28), and finally, on December 29th, Danuri's lunar mission orbit will be confirmed.

Robert PearlmanKorea Aerospace Research Institute (KARI) release
Earth-moon photographed by Danuri

Korea Aerospace Research Institute released Earth-Moon photos taken by Danuri.

Danuri is currently carrying out work such as checking the performance of the payload and adjusting errors, and since February, full-fledged scientific research such as moon science research (photography of the lunar surface, polarization imaging, imaging of permanent shaded areas and observation of magnetic field and gamma rays), space internet technology verification, etc. technical missions will be performed.

Dec. 24, 2022, 344 km above the moon:

Dec. 28, 2022, 124 km above the moon:

Dec. 31, 2022, 119 km above the moon:

Jan. 1, 2023, 117 km above the moon:

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