Un'esplosione cosmica con la forza di un miliardo di soli è passata inosservata, finché non ne abbiamo colto l'eco
Alcune delle esplosioni più estreme dell’universo non lasciano quasi alcuna traccia visibile. L’esplosione iniziale non viene osservata, ma le nostre osservazioni possono catturare l’eco di lunga durata che essa lascia quando l’onda d’urto si propaga nell’ambiente circostante.
https://umbertogaetani.substack.com/p/unesplosione-cosmica-con-la-forza
Un “satellite zombie” NASA, Relay 2, a émis un signal radio ultra‑puissant (30 ns) en 2024, relançant le mystère des débris spatiaux !
https://www.science-et-vie.com/ciel-et-espace/on-vient-dapprendre-que-le-signal-radio-spatial-le-plus-intense-capte-en-2024-venait-dun-satellite-zombie-203596.html
#espace #astronomie #découverte
#radioastronomie #zombiesatellite #ASKAP
#Relay2 #spacejunk #tendance #zombieSatellite
#arxiv:
"
A nanosecond-duration radio pulse originating from the defunct Relay 2 satellite
"
".. detection of a burst of emission over a 695.5 MHz-1031.5 MHz bandwidth by the Australian Square Kilometre Array Pathfinder, ASKAP .."
https://arxiv.org/abs/2506.11462
13.6.2025
#ASKAP #ESD #Kommunikationssatellit #plasma #Raumfahrt #Relay2 #Satelliten #SpaceFlight #Radioastronomie #Radioteleskop #Weltraummüll #Weltraumschrott
We report the detection of a burst of emission over a 695.5 MHz-1031.5 MHz bandwidth by the Australian Square Kilometre Array Pathfinder, ASKAP. The burst was localised through analysis of near-field time delays to the long-decommissioned Relay 2 satellite, and exhibited a dispersion measure of $2.26 \cdot 10^{-5}$ pc cm$^{-3}$ -- 69.7 TECU, consistent with expectations for a single pass through the ionosphere. After coherent dedispersion, the burst was determined to be less than 30 ns in width, with an average flux density of at least 300 kJy. We consider an electrostatic discharge (ESD) or plasma discharge following a micrometeoroid impact to be plausible explanations for the burst. ESDs have previously been observed with the Arecibo radio telescope, but on 1000 times longer timescales. Our observation opens new possibilities for the remote sensing of ESD, which poses a serious threat to spacecraft, and reveals a new source of false events for observations of astrophysical transients.
Using the Australian Square Kilometer Array Pathfinder (ASKAP), astronomers have discovered 15 new giant radio galaxies with physical sizes exceeding 3 million light years. The finding was reported in a research paper published April 9 on the arXiv preprint server.
Fifteen new giant radio galaxies discovered with ASKAP
https://phys.org/news/2025-04-fifteen-giant-radio-galaxies-askap.html
#HackerNews #Fifteen #new #giant #radio #galaxies #discovered #with #ASKAP #astronomy #discovery #space #science #radio #galaxies #ASKAP
Using the Australian Square Kilometer Array Pathfinder (ASKAP), astronomers have discovered 15 new giant radio galaxies with physical sizes exceeding 3 million light years. The finding was reported in a research paper published April 9 on the arXiv preprint server.
Your on a Good Thing [TM] when the first trial you run yields "too much" [1] good data :)
SKA -side effects 101
**Cosmic Fast Bursts**
January 28, 2025
The first trial of an Australian-developed technology has detected mysterious objects by sifting through signals from space like sand on a beach.
“That’s the equivalent of sifting through a whole beach of sand to look for a single five-cent coin every minute,”
“We’re also detecting long-period transients, which remain mysterious objects within our galaxy. Both fast radio bursts and these transients were first discovered in Australia, so it is great that we’re continuing the path of discovery with this impressive technology,” Dr Wang said.
[1] more than expected
#Astronomy #CosmicFastBurst #CSIRO #ICRAR #ASKAP
The first trial of an Australian-developed technology has detected mysterious objects by sifting through signals from space like sand on a beach. Astronomers and engineers at CSIRO, Australia’s national science agency, developed the specialised system, CRACO, for their ASKAP radio telescope to rapidly detect mysterious fast radio bursts and other space phenomena. The new technology […]
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