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HAYABUSA2@JAXA 5 Aug 18
[GravMO] Gravity Measurement Operation begins! Today (August 5) was a day of preparation. The spacecraft remained at the home position (~20km altitude) and the descent has not yet started.
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HAYABUSA2@JAXA 5 Aug 18
Replying to @haya2e_jaxa
[GravMO] At 09:50 JST (Aug. 6) we reached GATE #1: the decision whether to begin the Gravity Measurement Operation. The current altitude is 20km. The spacecraft and operation stations are ready, and we have decided to begin. At the moment, descent as not yet started.
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HAYABUSA2@JAXA 5 Aug 18
Replying to @haya2e_jaxa
[GravMO] 11:00 JST on Aug. 6: we have confirmed that descent started normally. The current altitude is ~20km and the descent speed is ~40cm/s.
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HAYABUSA2@JAXA 5 Aug 18
Replying to @haya2e_jaxa
[GravMO] We’re posting our navigation images taken with the ONC-W1 as we descend towards Ryugu in real time here! Also, the navigation images from our Medium Altitude Operation from Jul. 31 - Aug. 2 can be seen all together here:
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HAYABUSA2@JAXA 5 Aug 18
Replying to @haya2e_jaxa
[GravMO] This image captured by the wide-angle ONC-W1 for navigation was received at UTC 2018-08-06 03:23 (Aug. 6, 12:23 JST) 📷 ©JAXA.
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HAYABUSA2@JAXA
[GravMO] 15:00 JST, August 6, 2018: the altitude of Hayabusa2 has lowered to about 14km.
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HAYABUSA2@JAXA 6 Aug 18
Replying to @haya2e_jaxa
[GravMO] At 20:30 JST on August 6, 2018 we reached “GATE #2”: the 6000m altitude checkpoint! The descent speed has been slowed to 8.5cm/s. From here on, the descent will be free-fall to measure the asteroid’s gravity. The navigation guidance and spacecraft state are normal.
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HAYABUSA2@JAXA 6 Aug 18
Replying to @haya2e_jaxa
[GravMO] Image taken for navigation by the onboard wide-angle camera, ONC-W1, at UTC 2018-08-06 11:32 (August 6, 20:32 JST). The asteroid is gradually getting bigger! (📷 ©JAXA)
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HAYABUSA2@JAXA 6 Aug 18
Replying to @haya2e_jaxa
[GravMO] August 6, 2018 at 22:30 JST is the shift handover from the evening team to the late night team. Tweet updates will come from Hayabusa2 team's "IES兄" (the "big brother" of the Ion Engine Systems)!
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HAYABUSA2@JAXA 6 Aug 18
Replying to @haya2e_jaxa
[GravMO] August 6, 2018 at 23:30 JST: we have reached an altitude of 5000m and the spacecraft is continuing the gravity measurement descent.
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HAYABUSA2@JAXA 6 Aug 18
Replying to @haya2e_jaxa
[GravMO] Image taken for navigation by the onboard wide-angle camera, ONC-W1, at UTC 2018-08-06 13:56 (August 6, 2018 at 22:56 JST). (📷 ©JAXA)
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HAYABUSA2@JAXA 6 Aug 18
Replying to @haya2e_jaxa
[GravMO] Image taken for navigation by the wide-angle, ONC-W1 at UTC 2018-08-06 14:25 (August 6, 23:25 JST). (📷 ©JAXA) Don't forget, you can see all the navigation images taken so far at:
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HAYABUSA2@JAXA 6 Aug 18
Replying to @haya2e_jaxa
[GravMO] Image taken for navigation by the wide-angle camera, ONC-W1, at UTC 2918-08-06 16:53 (August 7, 1:53 JST). (📷 ©JAXA)
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HAYABUSA2@JAXA 6 Aug 18
Replying to @haya2e_jaxa
[GravMO] On August 7, 2018 at 02:15 JST, the altitude of Hayabusa2 is 4000m above Ryugu's surface. The spacecraft is continuing the gravity measurement descent.
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HAYABUSA2@JAXA 6 Aug 18
Replying to @haya2e_jaxa
[GravMO] Good morning from Japan! On August 7, 2018 at 06:00 JST, the altitude of Hayabusa2 is 2300m.
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HAYABUSA2@JAXA 6 Aug 18
Replying to @haya2e_jaxa
[GravMO] Image taken for navigation at UTC 2018-08-06 20:53 (August 7, 5:53 JST) by the onboard wide-angle camera, ONC-W1. (📷 ©JAXA)
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HAYABUSA2@JAXA 6 Aug 18
Replying to @haya2e_jaxa
[GravMO] August 7, 2018 at 07:00 JST we had a briefing and shift transfer from the late-night team to the daytime team. The gravity measurement descent of Hayabusa2 has now entered the phase of closed approach to Ryugu! Tension in the control room has increase, reports IES兄.
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HAYABUSA2@JAXA 6 Aug 18
Replying to @haya2e_jaxa
[GravMO] The ground operation station for communication has changed from the Usuda Deep Space Centre (Japan) to DSN Madrid (Space) and DSN Goldstone (USA) and is about to be handed back to Usuda once again.
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HAYABUSA2@JAXA 6 Aug 18
Replying to @haya2e_jaxa
[GravMO] There is a passage of poetry by Shuntaro Tanakawa --recalls IES兄, as we transfer communication between ground stations-- that goes "We relay the morning from longitude to longitude, and so take turns, as it were, in protecting the [Earth] spacecraft."
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HAYABUSA2@JAXA 6 Aug 18
Replying to @haya2e_jaxa
[GravMO] Image taken for navigation by the wide-angle camera, ONC-W1, at UTC 2018-08-06 22:23 (August 7, 7:23 JST). (📷 ©JAXA)
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