M-type asteroids are high albedo (i.e shiny) asteroids made partially or mostly of metal. Of all of M-type asteroids currently known in the solar system, 16 Psyche is the most massive. It is a hunk of iron and nickel (and other heavy metals?) which has a diameter of 250 kilometers. Psyche orbits the sun between Mars and Jupiter and is believed to be the exposed core of a planet approximately the size of Mars which was obliterated by a catastrophic impact. The asteroid is named after the intrepid mortal who found love and ultimately apotheosis in an “Eyes Wide Shut” type Greek myth of great suspense, horror, and beauty.
Are you curious to know more about 16 Psyche based on this description? I certainly hope you are, because NASA has just announced future missions for the 2020s and 16 Psyche is on the list. As currently conceived, the Psyche exploration mission will send a robot probe powered by solar electric propulsion out to the obliterated core to examine the planetoid. The probe will be equipped with a magnetometer and a gamma-ray spectrometer to find out more about the composition and history of the enigmatic relic.
Of course other long term aspects of the mission are of interest as well. Although we have not yet mastered nuclear fusion, safe comprehensive control of such boundless energy is probably only 20 years or so away [winky icon]. What if humankind had sophisticated manufacturing robots and near infinite energy? In such circumstances 8 million cubic kilometers of steel might come in very handy indeed. So far the good news keeps rolling in for 2017. This Psyche mission can’t happen fast enough for my taste.