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Wow! Have you been following NASA’s DART mission? “DART” is one of those Ghastly-Acronyms-which-Spell-out-the-Project (GASP!) which stands for “Double Asteroid Reflection Test”. Scientists are always discouraged that their jaw-dropping projects conducted in outer space can never garner the same level of attention as inane sports and celebrity folderol–so they give missions these names with futile hopes of grasping the popular imagination. Speaking of whipping up attention, you should immediately google “DART” to see Google’s unprecedented graphic/animation (uh, and all of the information and scientific details about this project, of course).
Anyway, the project’s name aside, DART is a smashing success and something which humankind should have been working on since the dawn of the space age. Ever since we finally understood what caused those craters on the moon (which took longer than you might expect) and the Alvarez hypothesis explained what caused the Cretaceous-Paleogene mass extinction, scientists and engineers have realized that humankind needs a proper planetary defense system to protect us from meteors, bolides, comets, space shards, and whatever cosmic flotsam and jetsam has been drifting around out there waiting to wreck us the same way the poor dinosaurs got creamed.
Although some previous asteroid and comet exploration missions have edged towards testing the behaviors of space objects subjected to manmade impacts and forces, the DART mission was designed specifically for the purpose of finding out about such things. Back in November of 2021 NASA launched a 610 kilogram impactor spacecraft to crash into Dimorphos (a tiny asteroid which orbits the larger asteroid Didymos). On September 26 (2022) the impactor crashed into Dimorphos as the Italian mini-satellite LICIACube looked on (as did many of our best telescopes).
Here is a NASA schematic which explains the mission (and its hypothesized outcome) far better than I could.
Of course in the grand scheme of things 610 kilograms is not very much mass–although a 610 kilogram (1340 lb) linebacker smashing into you would probably wreck your day–especially if he was running 6.6 kilometers per second (15,000 miles per hour) which was the closing velocity of the projectile and Dimorphos. Indeed, the Hubble and Webb space observatories were both keeping an eye on the collision and the results were pretty explosive.
We will await the exact numbers (scientists speculate that such an impact should release 20-30 gigajoules of energy–approximately equivalent to detonating 6 or 7 tons of TNT). Also, an EU spaceship named Hera is being dispatched to survey the results in 2026 (so more to follow). For now though, I am already breathing easier knowing that someone is finally working on this problem. Now we just need to work on the 8 billion other problems which are affecting Earth and casting a pall over humankind’s glorious future,
Hey remember that Japanese mission to drop adorable little hopping robots onto an asteroid? Wasn’t NASA planning on doing something like that so that the good ol’ US of A could get its hands on some asteroid bits too? Ummm yeah, NASA was planning to drop by near-Earth asteroid 101955 Bennu and pick up comet bits and they actually did do that…back in October 2020. I guess I got a little too distracted by whatever else was going on in October of 2020 to write about the mission. Sorry… (apparently I did manage to write about some pretty special bats though).
So, to quickly recap, 101955 Bennu is a carbonaceous comet about 500 meters (1640 feet) in diameter which orbits the sun in the Apollo group of asteroids (a group of solar-system asteroids which orbit the sun inside the orbit of Mars–see the diagram immediately below). Bennu looks roughly like an old fashioned spinning top–if that top were enormous and made out of garbage from outer space (as stunningly depicted in the never ending movie at the top of this post). Because of its (relative) proximity and strange composition, Bennu was chosen as the target of NASA’s OSIRIS-REx mission.
OSIRIS-REx launched back in 2016 and spent two years flying to Bennu. From 2018 to 2020 the spacecraft made extensive surveys of Bennu in preparation for the October 2020 landing event (when the mothership sent down a lander to take a bite out of the ball of dust and ice). This is where the story gets interesting, since, apparently Bennu is not really one big gray ball, but a big gray ball made of lots and lots of little pieces of rubble. NASA scientists have likened the landing to landing in a ball-pit in one of those 80s/90s theme restaurants with extensive play facilities for children.
As the lander took a sample bite of asteroid it actually began sinking into the gray nodules like a child lost at Chuck E. Cheese’s and the whole mission seemed in danger until the controllers decided enough was enough and blasted right out of there. Apparently this “ball pit incident” also explains why the lander could not quite bite down on its whole load of carbonaceous astro-bits and spewed some of its precious payload back into space before being secured. Don’t worry though, mission controllers confirm there is still plenty more than the minimum required 60 grams of sample asteroid material (some of which consists of mini-pebbles caught in steel velcro-style loops put inside the sample collector for exactly this purpose).
Now that Bennu has been mapped and sampled, OSIRIS-REx is returning to Earth to drop the precious sample into the Utah desert. After this cosmic layup, the spacecraft will then set course for 99942 Apophis, a space lozenge, approximately the size of the Empire State building, which briefly alarmed the good people of Earth back in 2004 when astronomers estimated it had a 2.4% chance of striking our planet (spoiler: it did not). Apophis is arguably less interesting to science in that it has less of a heterogeneous assortment of stuff than Bennu, but it might be more interesting to the brave cadets of the Space Force (does that still exist?), in that it is more characteristic of the sort of object known to threaten our beautiful blue-green world of delicate lifeforms with selfish genes. Ferrebeekeeper will keep a better eye on these asteroid missions and report about subsequent developments (provided that we don’t face more home-made challenges to our survival like we did in October 2020).
52768 (1998 OR2)
On Wednesday morning at 5:56 a.m. (New York Time), the world will receive a reminder that things could always be a lot worse when a 2 kilometer (1.2 mile) asteroid zips by Earth at 31319 kilometers per hour (19,461 miles per hour). The great boulder goes by the not-very-lovely name 52768 (1998 OR2). It was discovered in 1998 by NASA’s Center for Near-Earth Object Studies, a program established to protect the denizens of Earth from possible space collisions (although our current terrestrial troubles suggest we may need to get our act together a bit better if we ever hope to, you know, actually do anything if one of these things comes straight towards us).
“But I voted to make dinosaurs great again!”
Fortunately during this pass-by, the asteroid will be a comfortable 6.3 million kilometers (3.9 million miles) away. That sounds disturbingly close, but it is really 16 times farther than the moon. Astronomers are carefully measuring the fly-by though, in order to learn what they can about asteroids, and because 52768 (1998 OR2) will be back…and next time it will be much closer. In 2079 it will probably be 3.5 times closer than it is this time, so mark your calendars for that: it might be a bit more exciting than this time around.
I have been trying to spruce up my online presence by building some new web pages (more about that soon) and by fixing the site I already have which everybody loves [crickets], um, which is to say Ferrebeekeeper! Unfortunately trying new things doesn’t always work…so kindly forgive me if yesterday’s post looks a bit peculiar. We will work with the web guru to get it all taken care of. In the mean time, speaking of experimenting with new things, let’s check back in on JAXA spaceship Hayabusa2.
When last we checked in with Hayabusa2, the Japanese spaceprobe had entered orbit around Asteroid Ryugu (a carbonaceous near-Earth asteroid, which is believed to be composed of pristine materials left over from the dawn of the solar system). Hayabusa2 was deploying tiny 1.1 kilograms (2.4 pounds) hopping droids to jump around the ancient ball of rock and snow and learn whatever they could. These robots would be followed by a larger robot probe, Mascot, which would study the asteroid in depth before Hayabusa2’s glorious showstopping signature move–a descent to the surface in order to fire a projectile into the asteroid (in order to collect an asteroid sample). That’s right: while Americans have been utterly transfixed by the bloviations of our felonious leader, the Japanese have dispatched a spacefaring robot to drop hopping mechanized lice on a primeval space snowball and then to pop a cap in it! Respect to the Land of the Rising Sun!
The probe arrived in perfect condition back in September of 2018, but the next phase of the mission got off to a rocky start…literally! JAXA expected Ryugu to be covered with fine powder, but it was covered with jagged rocks. The tiny hopping bots MINERVA-II1 A and B were really meant to test the conditions for MASCOT, a shoebox like robot-probe with real scientific instruments. On a prior mission these hopping probes were too enthusiastic and, after a single touchdown, they hopped magnificently but suicidally into the infinite void (presumably yelling inaudible robot slogans of honor). Although conditions on Ryugu were not as expected, the second generation Minervabots did a better job this time: they delivered the necessary telemetry, astrionics, and surface conditions to bring the mission to the next phase. Mascot was duly dispatched back in October and it operated faultlessly for 17 hours before its battery ran out and the active phase of its mission ended. [As an aside, I am finding it challenging to describe all of the things happening on a planetoid inhabited entirely by various sorts of robots]
On February 22nd 2019, the Hayabusa2 spacecraft descended to the surface of the asteroid and physically collected a substantial sample of the regolith by shooting the asteroid with a small projectile. You can watch the video of the brief encounter here. There are a lot of pebbles and shards flying around, but apparently the craft was fine and is now back in orbit while the ground crew looks for a final site to sample in April.
This mission is super exciting, but the precious samples aren’t home yet. We will keep you updated here on Ferrebeekeeper (and we will keep working on our own tech project of building a better site).
Congratulations to the Japanese Space Agency! On Friday morning (EST) the Japanese space probe Hayabusa2 dropped two adorable little hopping rover bots (“hoppers”? “hop-overs”? “hop-bots”? um, we’ll work on it…) onto the surface of Asteroid Ryugu. The spacecraft arrived at the near-Earth asteroid back in June when the sort-of-octahedral space rock was passing near to our home planet. The twin “MinervaII” probes (“Micro Nano Experimental Robot Vehicle for Asteroid”) are 18 centimeter (7 inch) disks which weigh 1.1 kilograms (2.4 pounds) each. Making use of the asteroid’s exceedingly low gravity, the tiny robots will hop to their location and deliver readings about the composition of the ancient icy rock, which will hopefully provide insight into the formation of the solar system. Additionally, more stirring action is on the way in October when Hayabusa II will deliver a larger lander (named Mascot!) and then a third Minerva lander. This flurry of activity is in preparation to collect asteroid material which will be returned to Earth!
Hopefully….the MinervaII probes are (unsurprisingly) the second in a line of Minerva probes. The first Minerva hopping robot met an inglorious fate during the first Hayabusa mission to the asteroid Itokawa in 2005. That (smaller) Minerva rover was deployed a bit early and hopped ignominiously into the void of space. Sadly I don’t have pictures, but imagine a hockey puck falling into infinite blackness.
I will follow up with more news about this mission as it becomes available, but for now let us celebrate!
Oumuamua is an asteroid which came from beyond the solar system. Perhaps it was ejected from a star system in the Carina–Columba association (which is not an Italian fraternal organization but rather a vast nebula by Eta Carinae about 100 parsecs) around 50 to 100 million years ago, but its age and point of origin are unknown. It is whipping past the sun and then back into the vast darkness between the stars at a prodigious velocity (apparently it was traveling through interstellar space at something like 26 kilometers per second (58,000 miles per hour). The object, which measures between 100 and 800 meters (300 to 2500 feet), was initially classified as a comet, but its speed, its orbital eccentricity, and its bizarre shape–which is like an icicle or a shard–caused astronomers to realize it was deeply strange interloper from beyond.
The object has been closely observed by many of the Earth’s great observatories and it is apparently a dark red—which is caused by cosmic radiation striking it for 100s of millions of years (Kuiper belt objects have similar coloration). It is traveling far too fast for any existing human craft too reach (although we may be able to build such crafts in the near future), however scientists are assessing it for traces of life or civilization by means of radio telescopy. It will be out by Jupiter next year and far beyond are kin soon after that, but scientists have learned a great deal from the visit. Additionally they speculate that other such objects come through the solar system at the rate of one or two per year (which does not seem like a lot considering how large the solar system is). We are lucky to have spotted this shard, but its catastrophic shape makes one speculate that there is a lot about planetary formation (and destruction) which we don’t know yet.
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.
Today (June 30th) is asteroid day. For this auspicious (yet anxious-making) holiday, I have been saving two asteroid-related miniature stories ripped from the headlines.
First, we return to the dwarf planet Ceres, the largest object in the asteroid belt. We need to revisit the bright spots upon the dwarf planet’s surface. Ever since the New Horizons spacecraft began to approach the little world, these glistening spots have fascinated the astronomy community. Initially scientists thought that the spots were composed of hydrated magnesium sulfate (a substance quite similar to the Epsom salts sold for bathing and foot-soaking), however it now seems like the shiny patches are made of something else entirely. According to astronomers, the particular chemical in these glistening patches actually turns out to be sodium carbonate–a salt formed from carbon. On Earth, this chemical usually forms in evaporitic conditions–when water evaporates from a lake, sea, or hot springs. This seems to indicate that the geology of Ceres is more complicated than initially thought—instead of a big ice crystal which has always been the same, the miniature planet has undergone changes: surface water evaporated to leave these mysterious chemical deposits. Hopefully finding out about Ceres’ past can teach us more about how planets form (or don’t form).
Second, we turn our eyes back closer to Earth to take in the newly discovered “second moon” a tiny asteroid about the size of the great pyramid of Giza which seems to be orbiting Earth. This new asteroid, called 2016 HO3, is not really a true moon but a quasi-satellite: it sometimes loops around our planet because Earth and the little rock both orbit the sun on a similar circuit. The asteroid orbits the sun in 365.93 days (just slightly longer than Earth’s orbit of 365.24 days). Thus, for the next few hundred years it will act like a true moon as our orbits converge. The rock is about 40 meters (130 feet) across by 100 meters (328 feet) wide. It is a bit strange to think about it up there hidden in the darkness, but it is a fairly comforting asteroid day story. 2016 HO3 is never destined to hit Earth. The really bad asteroids seem to be the ones we don’t know about (so it is time to keep our eyes on the skies and learn more).
216 Kleopatra
It’s time for Ferrebeekeeper to get back out to space. This grotesque gray hambone-looking thing is a metallic asteroid approximately the size of New Jersey known as 216 Kleopatra. The asteroid was discovered in 1880 by Austrian astronomer Johann Palisa when he was director of the Austrian naval observatory at the great Austrian naval port of Pula (!). The asteroid is 217 kilometers long by 94 kilometers deep by 81 kilometers long (135 miles by 58 miles by 50 miles). It is composed of slurry of metal, dust, and…nothing: between 30 to 50% of the asteroid’s volume is empty space (which makes it sound a lot like the consumer goods for sale in American stores).
216 Kleopatra has been the subject of a fair amount of human scrutiny. In 2008, a team of astronomers working from Hawaii’s Keck observatory (at the summit of Mauna Kea in Hawaii discovered two tiny moons orbiting the asteroid. These moons have diameters of about 5 km and 3 km respectively and they are named Alexhelios and Cleoselene for Cleopatra’s children.
An obvious question is what knocked this doughty asteroid into a strangely shaped cloud of weird slurry and little moons. The most obvious answer is an oblique impact, which astronomers estimate occurred about a hundred million years ago. I wonder what other secrets this giant rubble pile in space is hiding.
Also…it rotates, as seen in this stunning animation.
A gray-tufted monkey traveled to the edge of space according to Iranian media
Today’s post concerns various contemporary news items regarding outer space. At first this list may seem like a bit of a mash-up, but it all comes together as a very specific polemical point.
This year has already featured a lot of space news, but, sadly, most of it seems like it could have come from the 1950s. Iran launched a monkey to the edge of outer space. South Korea placed its first satellite in orbit (which seems like a response to North Korea doing the same thing last year).
South Korea’s rocket lifts off from its launch pad at the Naro Space Center in Goheung, South Korea
In US space news, the 27th anniversary of the Challenger disaster came and went (that was an epically bad day in 6th grade–which was hardly a picnic anyway). Additionally, America announced that its biggest space plans for the near future include landing a redundant lander on Mars which was not exactly what NASA wanted but it fit the budget and was politically expedient. Our not-very-exciting work on our not-very-exciting next generation rockets continues slowly.
Finally, in other space-related news, paleontologists discovered that a massive space event apparently bombarded the Earth with Gamma rays in the 8th century. Astronomers speculate that two neutron stars might have collided! Also on February 15th a 50 meter asteroid will narrowly miss the Earth (flying by closer than many of our communication satellites).
All of this paints a rather alarming picture of a turbulent and dangerous universe where catastrophic events can occur with little notice. Meanwhile on Earth dangerous rogue nations (not you, South Korea, we like your style) are venturing into strategically important low Earth orbit. NASA’s current large-scale projects are lackluster (although its robotic exploration of the solar system continues to be exemplary). Are we discarding our leadership position in space because of debt, political paralysis, and complacency? It certainly seems like it…
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