Category Archives: Comets and Asteroids

Could This Asteroid Hit Earth? Astronomers Go “Back in Time” to Find the Answer

Potentially hazardous asteroid 2016 WJ1 was discovered in Oct. 2016—but also in July 2003. Credit: Canada-France-Hawaii Telescope

Astronomers are always watching the skies for observations of near-Earth asteroids—”space rocks” that have orbits close to Earth’s and, in the case of potentially hazardous asteroids (aka PHAs), those whose orbits could actually cross Earth’s and are larger than 150 meters (500 ft) across. When a new one of these is discovered—no small feat considering that many are very dark, move quickly, and could really be anywhere in the sky—it’s a scramble to determine the object’s orbital parameters and figure out just how close it can get to us and when. Such was the case on Oct. 19, 2016, when the asteroid 2016 WJ1 was identified with the Catalina Sky Survey. This object, estimated to be anywhere from 110 to 340 meters across—easily within the potentially hazardous range—was initially calculated to pose a threat in 2065 with a possible impact risk, albeit a very small one. Eventually though, scientists were able to refine the risk chance with more observations of 2016 WJ1…observations that had actually occurred over 13 years earlier.

Read the full story from ESA here: Asteroid sleuths go back to the future

Asteroid 16 Psyche Could Truly Be a Psychedelic Little World—AND Worth Quadrillions

Artist’s rendering of the metal asteroid 16 Psyche. (Credit: Arizona State University)

NASA recently announced the go-ahead for a new Discovery-level mission that would send a spacecraft to explore 16 Psyche, a 130-mile-wide asteroid in the Solar System’s main belt between Mars and Jupiter. 16 Psyche is a relatively small world but is made almost entirely of metals—some of them what we’d consider precious on Earth, like nickel, gold, and platinum—and not only would that make it a fantastic-looking place with mountainous ridges of nickel and valleys filled with green olivine and yellow sulfur deposits, but also incredibly valuable…some estimates place 16 Psyche as “worth” up to $10,000 quadrillion.

Yes that’s quadrillion, as in one thousand trillion. (And times ten thousand!)

Read the rest of this story by Irene Klotz on Seeker here: Step Aside Iron Man, NASA’s Going to Explore a Strange Iron World

NASA Announces Two New Exploration Missions

Artist's rendering of the Psyche spacecraft in orbit (Credit: Arizona State University)

One of NASA’s next missions will be to visit an asteroid made of metal. (Credit: Arizona State University)

Happy New Year! Just four days into 2017 NASA announced its pick for two new Discovery missions to explore our solar system: one to investigate a few of the “Trojan” asteroids that Jupiter has gathered into its orbit with its mighty gravity, and another to visit the remains of an ancient planet’s metallic core!

“These are true missions of discovery that integrate into NASA’s larger strategy of investigating how the solar system formed and evolved,” says Jim Green, NASA’s Planetary Science Director. “We’ve explored terrestrial planets, gas giants, and a range of other bodies orbiting the sun… These additional pieces of the puzzle will help us understand how the sun and its family of planets formed, changed over time, and became places where life could develop and be sustained – and what the future may hold.”

Find out these new missions’ names, launch dates, and more below:

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With One More Comet Landing Rosetta’s “Rock and Roll” Mission is Ended

ESA's Rosetta mission has come to an end with the spacecraft's impact on Sept. 30, 2016. (Illustration by ESA/ATG medialab)

ESA’s Rosetta mission has come to an end with the spacecraft’s impact on Sept. 30, 2016. (Illustration by ESA/ATG medialab)

Rosetta is down. I repeat: Rosetta is down.

This morning, Sept. 30, 2016, just after 10:39 UTC (6:39 a.m. EDT) ESA’s Rosetta spacecraft ended its mission with an impact onto the surface of the comet 67P/Churyumov-Gerasimenko. The descent, begun with a final burn of its thrusters about 14 hours earlier, was slow, stately, and deliberate, but even at a relative walking pace Rosetta was not designed to be a lander like its partner Philae and thus ceased operation upon contact with the comet.

With the comet 446 million miles (719 million km) from Earth at the time, the final signals from Rosetta were received 40 minutes after impact, officially confirming mission end.

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NASA Readies OSIRIS-REx to Visit an Asteroid

Artist's concept of OSIRIS-REx (NASA/Goddard)

Artist’s concept of OSIRIS-REx (NASA/Goddard)

NASA is about to embark on its first mission to sample an asteroid—and I’ll have a front-row seat to the launch!

On Thursday, Sept. 8, at 7:05 p.m. (23:05 UTC) the launch window opens for the launch of OSIRIS-REx, NASA’s mission to visit the near-Earth asteroid Bennu, orbit and map it, collect a sample and return it to Earth. The 8-foot-wide, 20-foot-long spacecraft will launch aboard a ULA Atlas V rocket from Cape Canaveral AFS and as a member of the latest NASA Social event I and 99 other attendees will be at the Cape to see it off on its 7-year journey. Be sure to follow me on Twitter and Instagram to see pictures and videos from the two-day event on Sept. 7–8, and follow the #NASASocial hashtag on Twitter too!

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Rosetta Finally Found Its Lost Philae Lander

Rosetta's OSIRIS camera team has found the silent Philae lander on the surface of comet 67P

Rosetta’s OSIRIS camera team has found the silent Philae lander on the surface of comet 67P

Nearly two years after its historic landing on comet 67P/Churyumov-Gerasimenko, ESA’s lander has finally been spotted in an image from the orbiting Rosetta spacecraft—PHILAE HAS BEEN FOUND!

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