Cool story in the Atlantic about “lost” iron meteorites.
People tend to picture irons when they here “meteorites”. They are varied and fascinating and could provide interesting constraints on the formation of the Solar SYstem.
Today is one of the most exciting/stressful days of the year — LPSC abstract deadline day! Our group submitted a lot of great abstracts today — covering topics ranging from the Sun to the asteroid belt to distant supernovae.
Tomorrow is commonly known as the least productive day in planetary science.
Olga Pravdivtseva was awarded a NASA grant to use the iodine-xenon radiometric chronometer to investigate the formation and alteration of components in the CK and CV carbonaceous chondrites. Olga is one of the world’s experts in this technique which provides us with exquisite time resolution to understand processes in the early Solar System. With these measurements, it is possible to constrain the timing of events that happened four billion years ago to +/-100,00 years. This is equivalent to remembering the time at which something that happened a year ago to within 15 minutes!
The Atacama Large Millimeter/submillimeter Array (ALMA) released amazing images of twenty protoplanetary disks in the early stages (first few million years) of planet formation from the Disk Substructures at High Angular Resolution Project (DSHARP).
Our group studies these processes in our own Solar System using rocks that were around then.
This was a really cool project — measuring New Horizons’ upcoming target by stellar occultation, a sort of eclipse of another star by a distant object in our Solar System where the shadow passed over a small part of Earth. In a few weeks we’ll get to see Ultima Thule up close!
I’ve added a page that will feature some ~billion-pixel images of meteorites I’ve taken with electron and optical microscopes using this or this technique. The first one is a classic: Renazzo, the type sample of the CR chondrites. Renazzo fell in Italy in 1824 with a total mass of 1 kg. Check it out!
The Draconid meteor shower peaks tonight as the Earth sweeps through primordial dust spewed from comet 21P/Giacobini-Zinner. Ernst Zinner was a pioneering researcher in the study of presolar grains, a brilliant scientist and wonderful man who spent most of his career in our lab here at Wash U. Comet 21P is named for Ernst Zinner, but a different Ernst Zinner, a German astronomer, who made the second observation of 21P in 1913. Clearly this is a charmed name for space science!