Japan's Hayabusa2 sample-collecting spacecraft closes in on asteroid

Discussion in 'science, nature and environment' started by editor, Jun 25, 2018.

  1. editor

    editor Forked with electrons

    [​IMG]

    Amazing stuff!

    A Japanese Probe Is Closing in on an Asteroid 180 Million Miles from Earth
     
  2. Limejuice

    Limejuice Well-Known Member

    That picture - just wow!

    :eek:

    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.
     
  3. farmerbarleymow

    farmerbarleymow Seagull + Chips = Happy Seagull

    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. :cool:
     
    Limejuice likes this.
  4. krtek a houby

    krtek a houby Share knowledge, don't weaponize it

    That shape is worrying.

    [​IMG]
     
  5. editor

    editor Forked with electrons

    They've selected the landing site@

    [​IMG]

    Landing Site on Asteroid Ryugu Chosen for Japan's Hayabusa2 Mission

    [​IMG]
     
  6. JimW

    JimW 支那暗杀团

    That depression centre left is a bit Death Star-esque :hmm:
     
  7. NoXion

    NoXion Keep an eye out for diamonds

    That's no moon!

    Because it's not orbiting a planet.
     
    Chemical needs likes this.
  8. ATOMIC SUPLEX

    ATOMIC SUPLEX Member Since: 1985 Post Count: 3

    How big is that?
     
  9. fishfinger

    fishfinger تپلی

    It's in the OP :p
    That's 900 metres wide for the lazy.
     
  10. editor

    editor Forked with electrons

  11. editor

    editor Forked with electrons

  12. NoXion

    NoXion Keep an eye out for diamonds

    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.
     
    Signal 11 likes this.
  13. editor

    editor Forked with electrons

    Signal 11 likes this.
  14. editor

    editor Forked with electrons

    Another lander is heading to the asteroid tonight

    See Real-Time Photos of Asteroid Ryugu Ahead of Landing Attempt Tonight!
     
  15. editor

    editor Forked with electrons

    It's landed safely! Such brilliant science.

    Success! Hopping, Shoebox-Sized Lander Touches Down Safely on Asteroid Ryugu
     
    a_chap and fishfinger like this.
  16. editor

    editor Forked with electrons

  17. 2hats

    2hats

    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).
    [​IMG]
    [​IMG]
    As it touches down a tantalum 'bullet' will be fired down the sampling horn (below) to disturb and collect material.
    hayabusa2samplinghorn.png
     
  18. Pickman's model

    Pickman's model Starry Wisdom

    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.
     
    NoXion and editor like this.
  19. 2hats

    2hats

    Now descending at 0.1 m/s, just under 5km above the surface (raw navigational image):
    [​IMG]
     
    Enviro and editor like this.
  20. 2hats

    2hats

    342 million km, round-trip light time 38 minutes.
    ryugu.png
     
    editor, Pickman's model and Signal 11 like this.
  21. 2hats

    2hats

    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):
    [​IMG]
     
  22. 2hats

    2hats

    Now dropping through 300 m altitude. Has been given a GO and is now operating fully autonomously. Revised touchdown time 2325UTC.
    [​IMG]
     
  23. 2hats

    2hats

    Live feed from the JAXA Sagamihara Campus with simultaneous English translation. Now at 180 m altitude.
    [​IMG]
     
    Last edited: Feb 21, 2019
    fishfinger likes this.
  24. 2hats

    2hats

    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):
    [​IMG]
    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).
     
    editor likes this.
  25. 2hats

    2hats

    Target marker acquired; descent nominal.
     
  26. 2hats

    2hats

    Touchdown reported (early). Doppler indicates a nominal profile.
     
    Last edited: Feb 21, 2019
  27. 2hats

    2hats

    Back up to 800m altitude and high gain antenna is back, telemetry flowing once more.
     
    editor likes this.
  28. 2hats

    2hats

    Projectile firing confirmed. With any luck we will have a sample back on Earth in December 2020.
     
    editor likes this.
  29. 2hats

    2hats

    Image from navigation camera shortly after touchdown. Spacecraft shadow and darker areas scuffed by thrusters visible.
    td.jpg
    Sensors confirm the bullet did its job disrupting the asteroid surface for sample collection (a rise in temperature in the sampler horn was observed).
     
    Signal 11 and editor like this.
  30. 2hats

    2hats

    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.
     
    Last edited: Mar 8, 2019
    Limejuice, Signal 11 and fishfinger like this.

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