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HAYABUSA2@JAXA Aug 6
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 Aug 6
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 Aug 6
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 Aug 6
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 Aug 6
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 Aug 6
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 Aug 6
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 Aug 6
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 Aug 6
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 Aug 6
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 Aug 6
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 Aug 6
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 Aug 6
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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HAYABUSA2@JAXA Aug 6
Replying to @haya2e_jaxa
[GravMO] Aug. 7, 08:42 JST we reached “GATE 4”: confirmation of arrival at minimum altitude, end of gravity measurement operation. Commence rising ΔV. We’ve reached a min altitude of (preliminary report) 851m! The command to rise is confirmed & we have begun to ascend at ~0.2m/s
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HAYABUSA2@JAXA Aug 6
Replying to @haya2e_jaxa
[GravMO] The Project Manager has declared the gravity measurement descent a success! The control room applauded 👏🏻, reports IES兄! The minimum altitude of 851m (prelimary figures) of Hayabusa2 above Ryugu is closer than the nearest station (Fuchinobe) to ISAS/JAXA!
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HAYABUSA2@JAXA Aug 6
Replying to @haya2e_jaxa
[GravMO] Small correction: the measurement of the gravity will also be carried out during our ascent, so we have not quite finished!
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HAYABUSA2@JAXA
[GravMO] Aug. 7, 2018 at 12:30 JST: Hayabusa2 is steadily rising & has reached an altitude of ~3km, ascending at a speed of ~12cm/s. This is a “free-rise” state with no trajectory control; a reverse of free-fall. The speed gradually slows as Hayabusa2 is pulled by Ryugu’s gravity
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HAYABUSA2@JAXA Aug 6
Replying to @haya2e_jaxa
[GravMO] We have now finished updating the gallery of real-time navigation images from the onboard wide-angle camera, ONC-W1. We will organise these images later!
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HAYABUSA2@JAXA Aug 7
Replying to @haya2e_jaxa
[GravMO] Hayabusa2 is steadily ascending. As the gravity measurement operation is complete, we planned to increase ΔV. However, we decided to delay as a typhoon is approaching! This is to avoid being unable to operate due to weather when we return back to the home position.
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HAYABUSA2@JAXA Aug 7
Replying to @haya2e_jaxa
[GravMO] On August 7, 2018 at 18:17, we reached GATE 6: return to home position acceleration (ΔV) adjusted from schedule due to “Typhoon Avoidance Manoeuvre”. ΔV was confirmed to be successfully executed. The spacecraft will return to the home position on August 10.
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