I agree (and Thank You for including the video from the Twitter feed). The impact velocity was approximately 22,000 km/h (13,670.2 mph, see: https://www.nasaspaceflight.com/2022/09/dart-impact/ [this NASA article also says that LICIACube has sent back at least some of its images--watching DART impact on Dimorphos--so far]), and:

DART's TV camera system included a narrow-angle telescope (see: https://dart.jhuapl.edu/Mission/Impactor-Spacecraft.php ), through which the TV camera looked; Mariner 4, the earliest successful Mars probe, used a vidicon TV camera/Cassegrain (or Schmidt-Cassegrain) telescope combination. (The latter type uses a "corrector plate" forward lens, to create a flat image plane [a "plain" Cassegrain scope can use a curved photographic plate at the focal plane--as used in the Mount Wilson Observatory's Schmidt Camera--or a curved TV camera light sensor array plane, to accomplish the same thing].) DART's imaging system, including a telescope, enabled it to capture the excellent close-up views we saw. Also:

LICIACube (about which I haven't seen anything yet, beyond the brief positive mention in the above-linked NASA article) has narrow-angle and wide-angle imagers (see: https://www.asi.it/en/planets-stars...yond/liciacube/ ). Being a small--based on a 6U CubeSat--space probe, my guess is that its flight controllers are still preparing its images and data (from monitoring DART's impact) for transmission to Earth. (The descent video imagers on the recent Mars lander and rover spacecraft have operated similarly; the video images were captured and stored onboard in compressed form, and were later transmitted--at low data rates--to Earth, over the next few hours or days.) As well:

I haven't heard or read any news about LICIACube having any problems, so we should see its still and video views of DART's approach and impact on Dimorphos sometime over the next few days, at most. The transmission distance is about seven million miles; between that and LICIACube's small solar cell array (and lower transmitter power), sending all of the frames of full-motion video will take longer than with DART, which had bigger solar arrays, a more powerful transmitter, and a larger high-gain antenna.

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Kicked up a bunch of stuff, observable using Earth-based telescopes…

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Thanks for the images. It would really seem that the video from the sister ship should be fairly spectacular. That impact was a pretty decent amount of kinetic energy.

Bill, will you or your group have any involvement in analysis of the after-effects of the impact?

Earl

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What Earl said! That looked rather like a red dwarf star flare-up, and even Dimorphos' temporary "dust-o-sphere" (shell of dust, visually sort of like a planetary nebula's "bubble" blown around its central star) is distinctly visible.

I'm not only even more interested in seeing LICIACube's close-up still and video shots of DART's impact, but I really want to see the--also 6U CubeSat-size--solar sail-propelled NEA Scout asteroid probe (see: https://www.google.com/search?rlz=1...0&bih=789&dpr=1 ) get underway, whenever its carrier rocket, Artemis 1, is finally launched. NEA Scout will rendezvous with its target asteroid (which is currently the NEA--Near-Earth Asteroid--2020 GE [see: https://en.wikipedia.org/wiki/Near-...other%20factors. ], but may be changed, depending on the launch date & time). Because solar sails require no fuel, visits to other objects--asteroids and/or even short-period comets--could be made, depending on the spacecraft's longevity.

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Based on my current understanding, it will take several weeks for LICIACube to download its data to Earth. 6U cubesats don't have lots of umph in the transmitter category, so it will be a while.

Nope, the after-effects are going to be studied by a big consortium of scientists. My interest is from a NASCAR spectator point of view.

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google dart mission nasa for a fun animation...


Bill

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Here is a frame from the video shot by the Italian LICIACube companion craft to DART, this from a CNN article about yesterday's impact. As has been mentioned earlier, the full video will probably take some time to fully transmit to earth due to the small antenna and radio power of this sister craft.

Full article here: https://www.cnn.com/2022/09/27/worl...-scn/index.html


Earl

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Yep--ASI has released some "sneak peek" stills from LICIACube's video (see: https://www.space.com/dart-asteroid...5A-609994E2C5A9 ). That's okay; pity the Galileo (Jupiter Orbiter/Probe) flight controllers, who--because the orbiter's umbrella-like, X-band high-gain parabolic antenna reflector refused to open--had to receive every data bit and image 'in slow motion' (and from the better part of half a billion miles away, with the help of improvised data editing & compression techniques!), using one of the orbiter's low-gain S-band antennas.

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A couple animated GIF sequences from stills made by both Hubble and Webb of the DART impact.

NASA article link: https://www.nasa.gov/feature/goddar...-of-dart-impact

Earl

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Rocket-Brained Since 1970

It appears DART has made an impact (no pun intended) on Dimorphos' orbit around Didymos. From NASA this afternoon:

"Prior to DART’s impact, it took Dimorphos 11 hours and 55 minutes to orbit its larger parent asteroid, Didymos. Since DART’s intentional collision with Dimorphos on Sept. 26, astronomers have been using telescopes on Earth to measure how much that time has changed. Now, the investigation team has confirmed the spacecraft’s impact altered Dimorphos’ orbit around Didymos by 32 minutes, shortening the 11 hour and 55-minute orbit to 11 hours and 23 minutes. This measurement has a margin of uncertainty of approximately plus or minus 2 minutes."

Full article link: https://www.nasa.gov/press-release/...motion-in-space

Earl

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