"Give a man a watch and he will know the time; give him two and he will never be sure" - this was my impression when reading the Wikipedia article on 162173 Ryugu.

Mean diameter:

  • 0.865±0.015 km[3]
  • 0.87 km[4]
  • 0.90±0.14 km[5]
  • 0.92±0.12 km[6]
  • 0.980±0.029 km[7]
  • 1.13±0.03 km[8]

And no mass estimates at all.

Now that Hayabusa2 has arrived, do we have solid measurements of Ryugu's size and mass yet?

  • $\begingroup$ Give JAXA some time to collect and process their data. The papers about 25143 Itokawa were published 8 months after the Hayabusa 1 encounter. $\endgroup$ – Mike G Jul 8 '18 at 13:43
  • $\begingroup$ @MikeG: okay, then the question can just wait for the answer to become available. $\endgroup$ – SF. Jul 8 '18 at 14:19
  • $\begingroup$ There is a special session on Hayabusa2 at the Division of Planetary Sciences 50th meeting in October. I would expect the first preliminary science results to be announced there but the data analysis takes time. Volume ans Mass in particular take a while as you have to make sure you've mapped all the surface of the asteroid and sampled the variable gravity field $\endgroup$ – astrosnapper Jul 27 '18 at 16:21

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