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Mission: Hayabusa 2
post Nov 12 2018, 08:52 AM
Post #661


Press release (English PDF) from 8/nov press conference:

During TD1-R3:
LIDAR active down to 25m, then LRF. Synchronization to Ryugu speed, short "quick" descent before target release, target release at 12m altitude, ascent to 20 m, marker tracking , ascent back to 20000m.

2018/11/18-2018/11/29: Preparation period - On November 23, 2018, the spacecraft will be placed into the conjunction transition orbit. During this period, communications are not reliable due to Sun radio interference.
2018/11/30-2018/12/21: No trajectory control is performed, but communication with the spacecraft is still attempted.
2018/12/22-2019/01/01: Reversion period - Home Position Return control (HPR) maneuver will be performed on December 29, 2018 to return the spacecraft to the home position.

* JAXA Space Exploration Innovation Hub unveils a simple version of the shape model.
* The Hayabusa2 Science Team is developing a precise shape model for Ryugu.
* Schedule for release with the publication of the associated paper.
Downloadable here: http://www.ihub-tansa.jaxa.jp/ryugu_mokei.html
Direct link: http://www.ihub-tansa.jaxa.jp/files/tansax..._mokei_2018.fbx
Model based on low-res images from june 2018.
Number of vertices: 157,000
Number of triangular patches : 52, 600
File size: 4 MB, FBX Format
km unit

Selected landing site: L08-B

Next press conferences scheduled for 6/dec, 13/dec
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post Dec 5 2018, 02:29 AM
Post #662

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A post in the Osiris-REx thread reminded me: is there any reason Hayabysa 2 has stayed in basically an equatorial 'hover' for all this time, rather than going into a proper orbit like Osiris-Rex will after finishing imaging of the poles this month (which is also something Hayabusa 2 has not done)?

Why did the spacecraft go on a distant excursion away from Ryugu during solar conjunction, when they could have just spent that time in orbit. Surely there would be no danger of a collision after mapping out the gravity field! Or were they worried about accidentally going into the asteroid's shadow?
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Phil Stooke
post Dec 5 2018, 02:38 AM
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Probably more a matter of how confident they were that there would not be any problem during conjunction. Osiris-Rex doesn't have to worry about conjunction now, but they also might not want to stay in a low orbit for weeks without contact.


... because the Solar System ain't gonna map itself.
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