00:06. Zielerfassung hat Dimorphos erfaßt, aber noch nicht darauf zentriert. Zielumschaltung erfolgt bei 00:26, bei minus 46 Minuten.
00:34. "41 Minuten bis zum Einschlag." Sh. Beitrag. Aktuelle Entfernung von Didymos: 11.807.643 km. 28fache Mondentfernung. Die Sonnenpaneele, die eine Gesamtenergie von 6,6 KW liefern, haben eine Spannweite von jeweils 8,5 Metern. 00:47. Didymos zeigt ganz klar eine Scheibe. Dimorphos als schwächere Scheibe rechts darüber in der 2-Uhr-Position. Zielerfassung auf 30 m zentriert. 00.49. "All systems are GO." 00:55. 20 Minuten bis zum Aufprall. 00:56. "We are precision-locked on Dimorphos." 1:13. 2 Minuten. Zielgenauigkeit 17 Meter. 1:15. Einschlag. (Es war nichts mit einer "Kuppel mit Parabolantenne.")
"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire
Zitat "What happened to the mouse?" occurs when a minor character, action or very minor plotline is suddenly dropped from the story for no apparent reason, without any real explanation about what happened to it, and without a resolution.
Zitat "A German professor, living in the USA, has invented a rocket carrying a mouse, in the hope of reaching the moon. But the spacecraft is attracted by an invisible asteroid peopled with tiny beings who increase the animal's intelligence and send him back on Earth, dressed as Mickey Mouse."
In den 1950er Jahren... Hoch oben in einer kleinen Dachgeschoss-Wohnung lebt ein kleiner Untermieter, eine kleine graue Maus. Eines Tages entdeckt sie das angestaubte Teleskop, das in den Nachthimmel über der Stadt gerichtet ist und beginnt, eine unglaubliche Welt zu erforschen. Wie alle Mäuse ist auch diese Maus seit jeher vom Mond fasziniert, dieser merkwürdigen weiß-gelben Scheibe. Mal steht er dick und rund am Himmel, dann wiederum ist er nur eine dünne Sichel. Was ist er? Mit wissenschaftlichem Eifer und ihrem Teleskop ergründet unsere kleine Maus das Rätsel des Mondes.
Doch die anderen Mäuse hören dem kleinen Astronomen nicht zu. Sie haben sich vor langer Zeit schon entschieden, etwas anderes zu glauben. Der Mond ist Käse! Der größte Käse!
So fasst die Maus eine tollkühne Entscheidung: Sie wird die erste Maus auf dem Mond! Und somit wird sie allen beweisen, was der Mond in Wirklichkeit ist.
Die hier:
Zitat Jonathan McDowell @planet4589 LICIACube has now passed through the Didymos system and is continuing on in solar orbit. Its images of the impact will be downloaded in the coming hours 1:32 AM · Sep 27, 2022·TweetDeck
Zitat Thomas Zurbuchen @Dr_ThomasZ The team will be giving an update on the #DARTMission and its Sept. 26 intentional collision with asteroid Dimorphos on Tuesday, 10/11 at 2pm ET. Learn how to tune in: https://nasa.gov/press-release/nasa-to-p...y-defense-test/
Remember: DART is a test and there are no known asteroid threats to Earth.
Zitat NASA will host a media briefing at 2 p.m. EDT, Tuesday, Oct. 11, to discuss the agency’s Double Asteroid Redirection Test (DART) mission and its intentional collision with its target asteroid, Dimorphos.
The briefing will air on NASA TV, the NASA app, and the agency’s website.
Participants include leaders from NASA, the Italian Space Agency, and the DART mission team.
To attend the briefing in person, or to participate remotely and ask questions, media must RSVP no later than two hours before the start of the briefing to Josh Handal at: joshua.a.handal@nasa.gov. NASA’s media accreditation policy is available online.
The media briefing will take place in the Webb Auditorium of NASA Headquarters Mary W. Jackson building, 300 E. Street, SW in Washington.
On Monday, Sept. 26, DART successfully impacted its asteroid target in the world’s first planetary defense technology demonstration. As a part of NASA’s overall planetary defense strategy, DART’s impact with the asteroid Dimorphos will help to determine whether asteroid deflection using a kinetic impactor spacecraft is a viable mitigation technique for protecting the planet from an Earth-bound asteroid or comet, if one were discovered. The Johns Hopkins Applied Physics Laboratory manages the DART mission for NASA's Planetary Defense Coordination Office as a project of the agency's Planetary Missions Program Office. Neither DART’s target asteroid, Dimorphos, nor its larger asteroid parent, Didymos, poses a hazard to Earth.
Zitat Jeff Foust@jeff_foust NASA Administrator Bill Nelson says DART successfully changed the orbit of Dimorphos, decreasing its orbital period around Didymos from 11hrs 55 mins to 11hrs 23mins, a 32-minute change. 8:04 PM · Oct 11, 2022·Tweetbot for Mac
The precision of that orbital change ±2 minutes, says NASa’s Lori Glaze, planetary science division director. The minimal requirement was 73-sec change, but models estimated a change of a few minutes to several tens of minutes, so on the upper end of those models. 8:13 PM · Oct 11, 2022·Tweetbot for Mac
Zitat ESA Operations @esaoperations The results are in. @NASA crashed the #DARTMission into asteroid #Dimorphos. They altered its orbit by 4%.
Orig. orbit around central 🪨: 11hr 55mins Models expected: a few-10 mins difference Post impact: 11hr 23mins. A 32 min orbital change! 8:30 PM · Oct 11, 2022·Twitter Web App
Apropos "Matrix" (weil der Bezug in 2 Tagen nicht mehr herstellbar ist: ich habe vor einer Viertelstunde meinem letzten ZR-Beitrag über "die Entdeckung des Nordpols" verlinkt, in dem die Schlußvolte damit spielt). Kaum verfolgt man mal ein paar Stunden das Weltgeschehen nicht, weil man konzentriert an der Tastatur sitzt, wird einem als erstes das hier eingespielt:
Zitat Tom Williams@tw__astro 🚨ATTENTION! A small asteroid is expected to safely impact the French-English channel in ~4 hours time, 03:00:03 UT tomorrow. Object size is around ~1 meter and should appear as bright as the Moon momentarily as it enters the atmosphere. Approx visibility circle posted below. 1/ 12:08 AM · Feb 13, 2023
Object was discovered by the Konkoly Observatory in Hungary a few hours ago. Temporary designation of the object is Sar2667. It is expected to enter the atmosphere at around a 45° angle, coming from the East. 2/
Impact time of 03:00:03 has an uncertainty of a few minutes as it stands, but should be narrowed down to a few seconds by impact time. I'll keep it updated here in this thread. 3/
Info from respectable comet/asteroid enthusiast, friend and planetary scientist, Sam Deen
New info. Velocity is around 14.2km/s. Duration of atmospheric entry should be on the order of 10-15 seconds. 4/ #Sar2667 #Asteroid
UPDATE: Impact time has been narrowed down to 02:59:17 UT (+/- 30 sec) #Sar2667 #Asteroid
FINAL UPDATE: Atmospheric entry (aka breach of 50km altitude) confirmed to be 02:59:17 UT +/- 1 sec. 1h 10m from now. #Asteroid #Sar2667 is currently ~10,000km away (Diameter of Earth) at the time of this tweet. It will enter Earth's shadow ~5 mins before impact
Now 2:59:16.8 UTC +/- 0.2 sec. Crazy devices we have these days
Zitat von Ulrich Elkmann im Beitrag #8 Was IST eigentlich hier los??
Zitat During a routine search for near-Earth objects with his 0.6 m (2.0 ft) Schmidt telescope,[9] Krisztián Sárneczky first imaged 2023 CX1 on 12 February 2023 at 20:18 UTC, when it was less than 233,000 km (145,000 mi) from Earth and inside the orbit of the Moon at 0.61 lunar distances. ... Sárneczky immediately recognized it was a near-Earth object but did not realize it was on course for impact with Earth until he reobserved it half an hour later. The European Space Agency took notice of the asteroid's impending impact and alerted the public through social media.[9] The asteroid was last observed on 13 February 2023 02:48:01 UTC by Sárneczky, just under 12 minutes before impact and two minutes before it entered Earth's shadow and became invisible at 02:50 UTC.
2023 CX1 is the seventh asteroid discovered before being successfully predicted to impact Earth.[6] It is also Sárneczky's second discovery of an impacting asteroid, after 2022 EB5 which he discovered a year prior in March 2022.
Zitat Scott Manley@DJSnM The measured change in Dimorphos velocity was only 2.7mm/sec That's the equivalent of changing it position by 170km in the last two years (if it wasn't in orbit around Didymos). More than enough to make it miss Earth if it had been a threat to the planet. Last edited 12:10 AM · Sep 27, 2024
Zitat ESA's Hera mission@ESA_Hera Two years ago today, @NASA’s DART spacecraft slammed into asteroid Dimorphos, changing its orbit around the larger object Didymos in the 1st test of asteroid deflection. Here’s 3 things we learned from the impact, and 3 remaining mysteries that @ESA’s #HeraMission will help solve!
1) DART confirmed that a spacecraft can change an asteroid’s trajectory by crashing into it. The impact shortened the orbit of Dimorphos around its parent asteroid Didymos by about 32 minutes, demonstrating that kinetic impact is a possible strategy for planetary defence.
2) DART demonstrated that a spacecraft can autonomously track down and steer into an asteroid while too far from Earth to rely on real-time trajectory corrections from its control team back on the ground. Hera will also test new autonomous navigation technology at Dimorphos
3) The effect of the DART impact was greater than expected. The impact sent more debris hurtling into space than anticipated, suggesting that the asteroid’s surface is more porous or fragile. The escaping debris amplified the force of the impact and the change in the asteroid’s motion.
Three mysteries Hera will help solve: 1) Hera will measure the density and composition of Dimorphos in detail and help scientists determine whether it is a ‘rubble pile’ loosely held together by gravity, or a solid core covered in boulders and gravel.
2) Hera will map the crater created by DART’s impact down to 10 cm resolution to help scientists better understand how the surface material responded to the collision. It’s possible that there is no crater at all, rather the impact reshaped the entire asteroid!
3) ~15% of known asteroids are actually binary systems, but their origins remain mysterious. Hera will determine whether Dimorphos and Didymos are made from the same material, which would hint that the rapidly spinning Didymos once threw off debris into space that later formed Dimorphos.
Hera's investigation of Dimorphos and Didymos will complete the story that DART began two years ago and turn asteroid deflection into a well understood and repeatable technique for protecting Earth from a potential asteroid impact. Stay tuned for launch next month! 3:17 PM · Sep 26, 2024
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