[SCI] April 4 at 15:30 JST. The spacecraft continues to descent. The altitude has now passed 16km.
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[SCI] April 5 at 6:48 JST. Altitude has passed 2000m.
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[SCI] April 5, 07:00 (JST): operation has changed from the night shift to the day shift. The Small Carry-on Impactor (SCI) will be activated during this shift. At 08:09 JST, the spacecraft had descended to about 1.5 km.
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[SCI] During the use of the SCI, communication was planned via Usuda station. But there is a possibility that Usuda cannot be operated due to strong winds. We’ve therefore switched to the planned backup station in Canberra. During critical operations, the backup station is vital!
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[SCI] April 5 at 09:00 JST: the altitude of the spacecraft is about 1200m.
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[SCI] April 5 at 09:40 JST: The SCI (impact device) has confirmed to have turned on. It has not yet separated from the spacecraft.
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[SCI] April 5 at 09:57 JST. The transition to autonomous descent mode was determined as “GO”. [GATE 3 autonomous descent phase transition decision: GO]. The spacecraft has descended to an altitude of about 900m.
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[SCI] April 5 at 10:15 JST. All commands related to the SCI separation operation have been sent.
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[SCI] April 5 at 10:30 JST. The altitude has passed 700m.
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[SCI] April 5 at 10:56 JST. It is the onboard time for the SCI to separate. This will confirmed on the ground in about 17 minutes. Spacecraft altitude is about 17 minutes.
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[SCI] April 5 at 11:13 JST: At an altitude of 500m as planned, the SCI was separated from the spacecraft, and the spacecraft has confirmed to have moved to the evacuation operation.
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[SCI] April 5 at 11:32 JST: The separation of DCAM3 from the spacecraft has been confirmed. The spacecraft is now performing the evacuation ΔV (acceleration) as planned.
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[SCI] April 5 at 11:43 JST. It is now 10 minutes until the operation of the SCI (impact device) can be confirmed.
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[SCI] The SCI operation is at 11:53am JST (ground reception time). We will then watch the situation of the spacecraft for a few minutes. Previously we tweeted that we could confirm the operation of the SCI, but confirming the operation itself is not yet possible.
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[SCI] April 5 at 11:56 JST. The SCI operation time has passed and we have confirmed there is no problem with the spacecraft during the evacuation operation.
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[SCI] April 5 at 12:45 JST. The operation is steadily progressing. The control room was crowded with people, but now about 20 people are working here.
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[SCI] April 5 at 13:45 JST: Gate 5 was confirmed. The spacecraft state is normal and it was confirmed that the evacuation operation, the separation of the SCI and DCAM3 went as planned. The SCI separation and evacuation sequence were a success.
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[SCI] April 5 at 15:12 JST. The return to the home position at a 20km altitude was judged as “GO”. Currently, the spacecraft status is normal.
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[SCI] This is an image taken with the wide angle optical navigation camera (ONC-W1) immediately after (few seconds) the separation of the SCI. The retroreflective sheet on the SCI glows white due the image being shot with a flash. This showed the separation was on schedule.pic.twitter.com/8FPWY470nI
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[SCI] The deployable camera, DCAM3, successfully photographed the ejector from when the SCI collided with Ryugu’s surface. This is the world’s first collision experiment with an asteroid! In the future, we will examine the crater formed and how the ejector dispersed.pic.twitter.com/eLm6ztM4VX
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[SCI] April 5, 24:00 JST: the final shift 5 for the SCI separation operation was completed with a briefing for the eight people who remained in the control room until the end. With a modest applause, we considered this the end of the operation. Thank you for all your support!
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