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#Astrodon

76 posts55 participants4 posts today
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MPI for Gravitational Physics

Heute vor sechs Jahren spürten @LIGO Livingston und Virgo ein besonderes Gravitationswellen-Signal auf.

GW190425 war erst das zweite Signal, das (höchstwahrscheinlich) von verschmelzenden Neutronensternen stammte. Die Entfernung zur Erde war deutlich größer und die Himmelsposition deutlich ungenauer bestimmt als beim ersten solchen Signal (GW170817).

Daher konnten Astronom*innen kein Nachleuchten im elektromagnetischen Spektrum beobachten. Die Gesamtmasse der verschmelzenden Objekte war ungewöhnlich hoch, verglichen mit bekannten Neutronensternpaaren.

ℹ️ aei.mpg.de/379212/news-from-th

Die Veröffentlichung mit der genauen Untersuchung der Gravitationswellen erschien am 6. Januar 2020:

📄 iopscience.iop.org/article/10.

Numerische Simulation der Gravitationswellen, die einander umrundende Neutronensterne abstrahlen.
#OnThisDay#OTD#GW190425
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Lazarou Monkey Terror 🚀💙🌈

"This result suggests that in Jupiter-like orbits, most planetary systems may not mirror our solar system," said co-author Youn Kil Jung of the Korea Astronomy and Space Science Institute, which operates the KMTNet."

I'm thinking big ol' Jupiter might hold the key as to why the inner Solar System is the way it is and why it's different from most other systems we know of so far.

phys.org/news/2025-04-super-ea

Phys.org · Super-Earths are common outside the solar system, new study showsBy Megan Watzke
#Exoplanets#Astrodon#Jupiter
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REBOUND Citation Bot

A new paper by Smirnov has cited REBOUND:
A highly resonant Neptunian region: A systematic search for two-body and three-body mean-motion resonances ui.adsabs.harvard.edu/abs/2025 #nbody #astrodon

ADS · A highly resonant Neptunian region: A systematic search for two-body and three-body mean-motion resonancesIn this study, a large-scale numerical investigation of resonant objects in the Neptune region is presented, focusing on both two-body and three-body mean-motion resonances (MMRs). Two separate simulations were conducted to identify resonant populations and quantify their prevalence. In Simulation 1, two-body MMRs with Uranus and Neptune up to the resonant order <mml:math><mml:mrow><mml:mi>q</mml:mi><mml:mo>≤</mml:mo><mml:mn>10</mml:mn></mml:mrow></mml:math>, as well as three-body MMRs involving both planets up to the order <mml:math><mml:mrow><mml:mi>q</mml:mi><mml:mo>≤</mml:mo><mml:mn>6</mml:mn></mml:mrow></mml:math>, were examined. Using automated resonance classification techniques, it was found that 42.1% of objects are resonant, increasing to 58.2% when including controversial cases. This is significantly higher than the resonant fraction observed in the main asteroid belt. The results confirm that two-body MMRs with Neptune dominate, with a smaller but significant fraction of three-body resonances and two-body resonances with Uranus. In Simulation 2, the analysis was extended to higher-order (<mml:math><mml:mrow><mml:mi>q</mml:mi><mml:mo>≤</mml:mo><mml:mn>20</mml:mn></mml:mrow></mml:math>) and high-integer-coefficient (<mml:math><mml:mrow><mml:msub><mml:mrow><mml:mi>m</mml:mi></mml:mrow><mml:mrow><mml:mi>i</mml:mi></mml:mrow></mml:msub><mml:mo>≤</mml:mo><mml:mn>50</mml:mn></mml:mrow></mml:math>) two-body resonances with Neptune, testing whether previously classified non-resonant objects might belong to higher-order MMRs. This second simulation revealed an additional 108 resonances and 104 new confirmed resonant objects, bringing the total fraction of resonant asteroids in the region to 49.3% confirmed cases and 65.1% with controversial cases included. Many new two-body MMRs with Neptune are found. Notably, some objects were found to be trapped in multiple resonances simultaneously. These results demonstrate that MMRs play an important role in shaping the trans-Neptunian region, with an overall resonance fraction more than three times higher than in the main asteroid belt. All objects in this region may be in fact resonant.
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Sterenn astro

La 27ème édition des Rencontres Astronomiques du Printemps, c'est dans un peu plus d'un mois ! La plus grande #StarParty de France se tiendra comme chaque année à Craponne-Sur-Arzon le week-end de l’Ascension, cette année du 29 mai au 1er juin.
Il est encore temps de s'y inscrire mais dépêchez-vous, la date limite est le 15 mai (c'est possible après mais c'est plus cher) et il y a déjà foule : 258 participants enregistrés à la date du 20 avril ! Les RAP, c'est une ambiance particulière, faite de rencontres et de partages, d'observations, d'astrophoto, de conférences, d'instruments hors-normes (télescope binoculaire, dobson 915mm, etc...) aux plus classiques... Une ambiance géniale pour tous les astronomes amateurs de France et d'ailleurs.
On s'y retrouve là-bas ?
#Astrams #Astronomie #Astronomy #Astrodon #RAP #RencontresAstronomiquesDuPrintemps #telescope
astrorap.fr/index.php

www.astrorap.frRencontres Astronomiques du Printemps - Accueil des RAPLes rencontres astronomiques du Printemps(RAP) sont une manifestation annuelle qui rassemble plus de 200 astronomes amateurs venus de toute la France.
Continued thread
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cafuego 🔭🤦🏼‍♂️

This is a closer look at the jets of material coming off one of the newly forming stars in Chamaeleon 1.

It is blowing a cone shaped jet toward us, and you can just barely make out a fainter one on the other side of the object.

Stars that are slightly older are clearing the dust around them and are making a wispy blue nebula, much like the Pleiades.

60 x 300 seconds of data with :meade_lx200_acf_ota: :zwo_uvircut_filter: :zwo_294mc: :zwo_am5: and processed with @Siril_Official

A dusty mess with stars making it shine blue. In the middle, a distinct V shape is made by a star blowing material off its magnetic poles.
#astrophotography#Astrodon#space
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cafuego 🔭🤦🏼‍♂️

Dust, dust and then some more dust.

This is Chamaeleon 1, part of the Chamaeleon CO Complex in the deep south. As opposed to the Dark Doodad (which is not far away) this region is rife with easily visible newly forming stars.

Hot bright large young stars are lighting up the dust with their blue light, whilst ones that are still forming are sending out jets of material from their dusty cocoons.

A distant galaxy on the left hand side, NGC3620, looks reddish because the dust scatters away the blue light. Like a smoky sunset on Earth.

120 x 300 second images acquired with :wo_redcat_61: :zwo_uvircut_filter: :zwo_294mc: :zwo_am5: and processed with @Siril_Official

A dense star field with curtains of dust hanging in front. The central part of the dust cloud is dense enough to obscure stars, and some knots are so dense they look completely black. Embedded in the dust are bits of blue nebulosity, as well as a small yellowish semi-circle and a small yellowish inverted V shape.
#astrophotography#Astrodon#space
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franco_vazza

Spectacular 7.25hours radio observations with MeerKAT of six "jellyfish" galaxies swimming in the Ophiucus cluster of galaxies, by my local colleague A. Botteon on #astroph this morning:

arxiv.org/pdf/2504.16158

These systems spread relativistic electrons and magnetic fields in the intergalactic medium and are a key ingredient to understand the cycle of cosmic rays on the largest scales in the Universe.

#Astronomy#astrodon#science
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