[HN Gopher] Small Asteroid Impacts Moon
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Small Asteroid Impacts Moon
Author : perihelions
Score : 157 points
Date : 2023-03-11 15:50 UTC (1 days ago)
(HTM) web link (twitter.com)
(TXT) w3m dump (twitter.com)
| Simon_O_Rourke wrote:
| The late Patrick Moore did a lot of work on what he termed
| transient lunar phenomena, essentially lights, or "clouds" on the
| moon, due to some unknown geological process.
|
| https://en.wikipedia.org/wiki/Transient_lunar_phenomenon
| [deleted]
| can16358p wrote:
| How rare are these impacts? Are they like once in a lifetime
| observations, about once a year, or what?
| NGC404 wrote:
| Nasa has a Program called "Lunar Impact Monitoring".
|
| See:
|
| https://link.springer.com/article/10.1007/s11038-007-9184-0
|
| https://ntrs.nasa.gov/api/citations/20150021386/downloads/20...
|
| http://lunarnetworks.blogspot.com/2013/05/brightest-impact-r...
|
| The data collected by the "Lunar Reconnaissance Orbiter" can be
| used to estimate the frequency of impacts.
|
| https://www.lroc.asu.edu/posts/943
| foobarbecue wrote:
| This paper found 222 impacts when comparing repeat LRO images
| (2009-present): https://www.nature.com/articles/nature19829
|
| I'm leading new a citizen science project called MoonDiff,
| comparing against older images to look further back in time --
| contact me if interested.
|
| https://moondiff.org
|
| https://trek.nasa.gov/moondiff/static/moondiff_intro.webm
|
| https://github.com/nasa-jpl/moondiff
| pfortuny wrote:
| Bottom right corner (took me a while to notice it so near the
| text).
| marcinreal wrote:
| I was able to click on the video to view it full screen, then
| there is no text. (Also took me a while to figure this out.)
| codeduck wrote:
| thank you!
| quercusa wrote:
| How Are Places on the Moon Named?
| https://www.smithsonianmag.com/air-space-magazine/how-are-pl...
|
| Planetary Names: How Names Are Approved
| https://planetarynames.wr.usgs.gov/Page/Approved
| omoikane wrote:
| Related:
|
| https://twitter.com/oldspica/status/1630425706290360321
|
| """ I magnified the location of lunar surface impact flash
| observed by Fujii Daichi-san on February 23 with 25cm reflection
| (telescope). It's near Ideler L crater according to Fujii-san.
| Unfortunately I was not able to discern anything like a new
| crater.
|
| I thought I would be able to tell if the diameter was larger than
| 2km?! ...
|
| I compared with with America's Lunar Reconnaissance Orbiter, but
| can't really tell.
|
| Even with such a flash, was that impact crater too small to be
| easily seen by telescope? """
| meindnoch wrote:
| Now Samsung has to patch their Moon template.
| tsujamin wrote:
| shit came here to make this joke
| jonas-w wrote:
| What do you mean with moon template?
| qup wrote:
| They were caught faking zoomed in photos of the moon on
| their phones with AI filling in details.
| asddubs wrote:
| https://old.reddit.com/r/Android/comments/11nzrb0/samsung_s
| p...
| yonz wrote:
| Did you see the HN comment? He basically said he was over
| redditors and loved the Convo on HN.
|
| https://news.ycombinator.com/item?id=35107601 <Insert it
| is known GIF>
| yonz wrote:
| Lol me too
| Maxburn wrote:
| Me x4!
| yonz wrote:
| Got down voted for my comment, save yourself.
|
| I am still figuring out participating in HN conversations
| but this downvote seems excessive no?
| yonz wrote:
| Probably was shot with a Samsung phone
| yonz wrote:
| This is clearly a joke btw
| [deleted]
| perihelions wrote:
| AI translation:
|
| - _" I was able to catch the biggest lunar impact flash in my
| observation history! This is a picture of the lunar impact flash
| that appeared at 20:14:30.8 on February 23, 2023, taken from my
| home in Hiratsuka (replayed at actual speed). It was a huge flash
| that continued to shine for more than 1 second. Since the moon
| has no atmosphere, meteors and fireballs cannot be seen, and the
| moment a crater is formed, it glows."_
|
| - _" This is a picture of the lunar impact flash at 20:14:30.8 on
| February 23, 2023, captured by another telescope (playback at
| actual speed). At that time, the altitude of the moon was only 7
| degrees, and I was glad that I could stick to the limit. At the
| time of observation, there was no satellite passing over the
| lunar surface, and from the way it shines, it is highly likely
| that it is a lunar impact flash."_
|
| - _" This is a still image of the lunar impact flash at
| 20:14:30.8 on February 23, 2023. It seems to have fallen near
| Ideler L crater, slightly northwest of Pitiscus crater. Because
| it is so bright, the generated crater is large, and the
| striations are clearly visible. It seems that the telephoto
| camera of NASA's lunar probe LRO can detect the fall trace."_
| elihu wrote:
| I wonder how big it was. Seems like it would have to be pretty
| big to be that bright, but maybe it's one of those things that
| defy our regular intuition.
| actually_a_dog wrote:
| I don't know, but compared to the scale of the gigantic crater
| that's visible in the image, whatever it was was pretty much
| nothing in the grand scheme.
| AnimalMuppet wrote:
| The impact that made that huge crater must have been an
| _amazing_ light show...
| Timwi wrote:
| The brightness is a function of momentum, meaning, it could be
| large or it could just be unfathomably fast.
| hanoz wrote:
| Why momentum rather than kinetic energy?
| michpoch wrote:
| What would create the brightness/light on such impact?
| [deleted]
| jacquesm wrote:
| Energy dissipation. It's enough energy to temporarily heat
| the rock and the impactor to the point that they start
| glowing very brightly.
| csomar wrote:
| Rather than size, I wonder how much energy the impact released.
| Waiting for the videos that will do a simulation of what would
| have happened if this have hit earth.
| _joel wrote:
| Doesn't have to be that big really.
| dm319 wrote:
| what does the light come from?
| op00to wrote:
| The flash is the energy (heat, light) generated by the forces
| of impact. The asteroid has incredible amounts of energy since
| it was likely moving very fast compared to the Moon, and it's
| got to go somewhere.
| Eduard wrote:
| Layman here. Considering there is no atmosphere on the moon,
| and stone's conduction properties, does that mean the short
| flash of light (radiation) was most of the heat energy the
| impact produced?
| varjag wrote:
| You see the part of the spectrum the camera sensor was able
| to capture. Most of the energy went into displacing/melting
| the regolith and the shockwave.
| wheelerof4te wrote:
| There's no shockwave since there's no air on the Moon.
| [deleted]
| amelius wrote:
| There can be a shockwave along the surface, I suppose,
| for example.
| op00to wrote:
| Could there be a shockwave through the Moon itself?
| wheelerof4te wrote:
| Possibly, since the regolith is a good conductor.
| wheelerof4te wrote:
| Yes.
|
| There would be no shockwave, just some light and incredible
| amounts of very localized heat.
| marginalia_nu wrote:
| Are we sure it didn't just kick up dust into the sunlight?
|
| Looks like the sun might have been just below the horizon.
| op00to wrote:
| If it kicked up dust, would the dust keep going, or would
| the Moon's gravity pull it back to the lunar surface
| quickly? I have no idea.
| ktm5j wrote:
| In my layman opinion a dust cloud would at very least
| stick around for much longer than the duration that we
| see this glowing last. There has to be something else
| responsible for the flash imo.
| cornstalks wrote:
| The moon's escape velocity is 2.38 km/s (5324
| miles/hour), so it just depends on whether or not the
| material reached escape velocity or not.
| gibmeat wrote:
| I thought about this too, but if it were dust, I'm guessing
| it wouldn't dissipate in 1 second.
| marginalia_nu wrote:
| Seems like atmospheric intuition.
|
| I'd expect high velocity dust to diffuse rather quickly
| in near vacuum.
| icehawk wrote:
| Here's a 2.8km/sec dust cloud from DART for comparison:
|
| https://www.virtualtelescope.eu/wordpress/wp-
| content/uploads...
| TrapLord_Rhodo wrote:
| It discusses this in the article. The regolith 'Glows' from the
| kenetic energy transfer, and heat disipation.
| tanbog5 wrote:
| The Sun I think.
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(page generated 2023-03-12 23:02 UTC)