Discussion in 'science, nature and environment' started by editor, Jun 25, 2018.
A Japanese Probe Is Closing in on an Asteroid 180 Million Miles from Earth
That picture - just wow!
Also, three rovers and a sample delivery service! THAT's doing space properly. For me, the whole 'edge-of-technology' is summed up in the phrase "or thereabouts".
Huge props to those boffins.
Perhaps it should be renamed 'asquareoid' given the odd shape. Cool probe though, and it'll be interesting to see what the samples returned to Earth show.
That shape is worrying.
They've selected the landing site@
Landing Site on Asteroid Ryugu Chosen for Japan's Hayabusa2 Mission
That depression centre left is a bit Death Star-esque
That's no moon!
Because it's not orbiting a planet.
How big is that?
It's in the OP
That's 900 metres wide for the lazy.
They Made It! Japan's Two Hopping Rovers Successfully Land on Asteroid Ryugu
Can we scrap Trident and do shit like this instead? We'd be able to do slightly better I reckon, since we don't have legal restrictions on the kind of rockets we can launch.
Hi-tech mission website - Haya2NOW
Another lander is heading to the asteroid tonight
See Real-Time Photos of Asteroid Ryugu Ahead of Landing Attempt Tonight!
It's landed safely! Such brilliant science.
Success! Hopping, Shoebox-Sized Lander Touches Down Safely on Asteroid Ryugu
It was a success. As I've said before, in a normal, non-fucked up, celeb celebrating world, this would be front page news. Oh well...
RIP, MASCOT: Hopping Lander Meets Its End on Asteroid Ryugu
Hayabusa2 is currently descending to the surface at around 0.9 m/s and touches down for the sample collection tonight - due at 2315UTC. Touchdown area indicated by the red dot in the first overview image, the target marker (TM, reference point) and sampling area (red zone L08-B1) indicated in the second image (spacecraft size given for scale).
As it touches down a tantalum 'bullet' will be fired down the sampling horn (below) to disturb and collect material.
that's absolutely amazing, that people can get something hundreds of thousands or millions of miles away to move with such precision onto a huge rock that's doubtless spinning round and round.
Now descending at 0.1 m/s, just under 5km above the surface (raw navigational image):
342 million km, round-trip light time 38 minutes.
At just over 500m above the surface we start the see the spacecraft's own shadow in the navigational imagery (9 o'clock position highlighted by a Heiligenschein halo):
Now dropping through 300 m altitude. Has been given a GO and is now operating fully autonomously. Revised touchdown time 2325UTC.
Live feed from the JAXA Sagamihara Campus with simultaneous English translation. Now at 180 m altitude.
64 m, nearing switch from LIDAR to laser range finder in the next couple of minutes for final approach. Approach profile for this stage to and through touchdown (so we are just coming to point 1 on this diagram):
TM is the target marker reference point mentioned previously. There will be a switch from high gain to low gain antenna during this touchdown (just after point 1) so positional information will then be informed through carrier Doppler measurement until the high gain antenna is regained about 2344UTC (ie no actual telemetry from sensors until then).
Target marker acquired; descent nominal.
Touchdown reported (early). Doppler indicates a nominal profile.
Back up to 800m altitude and high gain antenna is back, telemetry flowing once more.
Projectile firing confirmed. With any luck we will have a sample back on Earth in December 2020.
Image from navigation camera shortly after touchdown. Spacecraft shadow and darker areas scuffed by thrusters visible.
Sensors confirm the bullet did its job disrupting the asteroid surface for sample collection (a rise in temperature in the sampler horn was observed).
Lovely stabilised 'video' of the Hayabusa 2 sampling horn touchdown and retreat back through a cloud of debris kicked up by the tantalum bullet. Some of that debris scattering into the horn, collected ready for the return to Earth.
Note the video is about 5 times real time (actually technically, non-linear throughout). Impact was slower than a lazy walking pace.
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