I finally started uploading some of the animations of the talk that I gave last month at the California Academy of Sciences. Today let’s watch (624) Hektor, the binary and bilobed largest Jupiter-Trojan asteroids. This is a puzzling multiple asteroid system with a lot of mysteries (eccentric and inclined orbit of the moon, complex shape and structure for the primary, …).
Our study based on AO observations collected over 8 years was published in 2014. The conclusion of our work is that 624 Hektor is probably a captured Kuiper-belt object and the moon formed a long time ago from the slow velocity encounter of the components.
We will probably need to send a spacecraft over there to really understand this complex mini-geological world. The good news is that several space agencies, including JAXA and NASA, are thinking about that.
I would like to thank to my colleague Josef Durech, Matija Ćuk, Julie Castillo, Frederic Vachier, Jerome Berthier and numerous more for their long-term contribution to this project. I also should include my sister Helene Marchis for making the first drawing of this system. Thanks as well to the California Academy of Sciences for making those great CGI videos and the director Ryan Wyatt for inviting me.