#3iatlas — Public Fediverse posts

2026-09-16 00:00:00 UTC (Delta: 2026-09-15)

INTERSTELLAR VISITOR: 3I/ATLAS
- Barycentric speed: 59.32 km/s (-0.00 km/s)
- Crossing Uranus's orbit in: 222 days

🌎 Relative to Earth
- Distance (km): 1,750,363,236.24 km (+2,673,794.86 km)
- Distance (AU): 11.70 (+0.02)
- Light travel time: 1 h 37 min 18.58 s (+8.92 s)

#3IAtlas #InterstellarObject

2026-09-16 00:00:00 UTC (Delta: 2026-09-15)

INTERSTELLAR VISITOR: 3I/ATLAS
- Barycentric speed: 59.32 km/s (-0.00 km/s)
- Crossing Uranus's orbit in: 222 days

🌎 Relative to Earth
- Distance (km): 1,750,363,236.24 km (+2,673,794.86 km)
- Distance (AU): 11.70 (+0.02)
- Light travel time: 1 h 37 min 18.58 s (+8.92 s)

#3IAtlas #InterstellarObject

2026-09-16 00:00:00 UTC (Delta: 2026-09-15)

INTERSTELLAR VISITOR: 3I/ATLAS
- Barycentric speed: 59.32 km/s (-0.00 km/s)
- Crossing Uranus's orbit in: 222 days

🌎 Relative to Earth
- Distance (km): 1,750,363,236.24 km (+2,673,794.86 km)
- Distance (AU): 11.70 (+0.02)
- Light travel time: 1 h 37 min 18.58 s (+8.92 s)

#3IAtlas #InterstellarObject

2026-09-16 00:00:00 UTC (Delta: 2026-09-15)

INTERSTELLAR VISITOR: 3I/ATLAS
- Barycentric speed: 59.32 km/s (-0.00 km/s)
- Crossing Uranus's orbit in: 222 days

🌎 Relative to Earth
- Distance (km): 1,750,363,236.24 km (+2,673,794.86 km)
- Distance (AU): 11.70 (+0.02)
- Light travel time: 1 h 37 min 18.58 s (+8.92 s)

#3IAtlas #InterstellarObject

2026-09-16 00:00:00 UTC (Delta: 2026-09-15)

INTERSTELLAR VISITOR: 3I/ATLAS
- Barycentric speed: 59.32 km/s (-0.00 km/s)
- Crossing Uranus's orbit in: 222 days

🌎 Relative to Earth
- Distance (km): 1,750,363,236.24 km (+2,673,794.86 km)
- Distance (AU): 11.70 (+0.02)
- Light travel time: 1 h 37 min 18.58 s (+8.92 s)

#3IAtlas #InterstellarObject

2026-09-15 00:00:00 UTC (Delta: 2026-09-14)

INTERSTELLAR VISITOR: 3I/ATLAS
- Barycentric speed: 59.33 km/s (-0.00 km/s)
- Crossing Uranus's orbit in: 223 days

🌎 Relative to Earth
- Distance (km): 1,747,689,441.38 km (+2,693,022.82 km)
- Distance (AU): 11.68 (+0.02)
- Light travel time: 1 h 37 min 9.66 s (+8.98 s)

#3IAtlas #InterstellarObject

2026-09-15 00:00:00 UTC (Delta: 2026-09-14)

INTERSTELLAR VISITOR: 3I/ATLAS
- Barycentric speed: 59.33 km/s (-0.00 km/s)
- Crossing Uranus's orbit in: 223 days

🌎 Relative to Earth
- Distance (km): 1,747,689,441.38 km (+2,693,022.82 km)
- Distance (AU): 11.68 (+0.02)
- Light travel time: 1 h 37 min 9.66 s (+8.98 s)

#3IAtlas #InterstellarObject

2026-09-15 00:00:00 UTC (Delta: 2026-09-14)

INTERSTELLAR VISITOR: 3I/ATLAS
- Barycentric speed: 59.33 km/s (-0.00 km/s)
- Crossing Uranus's orbit in: 223 days

🌎 Relative to Earth
- Distance (km): 1,747,689,441.38 km (+2,693,022.82 km)
- Distance (AU): 11.68 (+0.02)
- Light travel time: 1 h 37 min 9.66 s (+8.98 s)

#3IAtlas #InterstellarObject

2026-09-15 00:00:00 UTC (Delta: 2026-09-14)

INTERSTELLAR VISITOR: 3I/ATLAS
- Barycentric speed: 59.33 km/s (-0.00 km/s)
- Crossing Uranus's orbit in: 223 days

🌎 Relative to Earth
- Distance (km): 1,747,689,441.38 km (+2,693,022.82 km)
- Distance (AU): 11.68 (+0.02)
- Light travel time: 1 h 37 min 9.66 s (+8.98 s)

#3IAtlas #InterstellarObject

2026-09-15 00:00:00 UTC (Delta: 2026-09-14)

INTERSTELLAR VISITOR: 3I/ATLAS
- Barycentric speed: 59.33 km/s (-0.00 km/s)
- Crossing Uranus's orbit in: 223 days

🌎 Relative to Earth
- Distance (km): 1,747,689,441.38 km (+2,693,022.82 km)
- Distance (AU): 11.68 (+0.02)
- Light travel time: 1 h 37 min 9.66 s (+8.98 s)

#3IAtlas #InterstellarObject

https://www.europesays.com/ie/688315/ Study: Interstellar Comet 3I/ATLAS Formed in Cold, Nitrogen-Rich Environment #3IATLAS #CarbonDioxide #CarbonMonoxide #comet #Éire #IE #InterstellarComet #InterstellarObject #Ion #Ireland #Methylidyne #MilkyWay #nitrogen #Science #SolarSystem #star #temperature #Water

Funny how after #oumuamua and #3iAtlas both "comets" with very non comet characteristics, including non-gravitational acceleration. Europe build a "comet" interceptor to be ready for the third "comet".
#space #comets

https://www.esa.int/Science_Exploration/Space_Science/Comet_Interceptor

@angryastro

We may not be able to see 3I Atlas any more, but it hasn't left the Solar System!

In fact, it's still inside the orbit of #saturn

And astronomers just made two bizarre discoveries about this mysterious interstellar object!

https://youtu.be/vj1raoD2eqw

#Comets #Astronomy #3IAtlas

Weekly Update from the Open Journal of Astrophysics 18/07/2026

It’s time once more for another Saturday update of activity at the Open Journal of Astrophysics. Since the last update we have published a further six papers, bringing the number in Volume 9 (2026) to 151 and the total so far published by OJAp up to 599.

I will continue to include the posts made on our Mastodon account (on Fediscience); these announcements also show the DOI for each paper.

The first paper to report this week, published on Tuesday 14th July, is “On combining estimated and analytic covariance matrices” by Alan Heavens (Imperial College London, UK), Lorne Whiteway (University College, London, UK) and Elena Sellentin (Leiden University, The Netherlands). This article, published in the folder Cosmology and Nongalactic Astrophysics, presents an accurate approximation for the combined likelihood function in cosmological data analysis, improving upon previous methods by better representing the heavy tails of the true distribution.

The overlay for this paper is here

You can find the officially accepted version on arXiv here and the announcement on Fediverse here:

https://fediscience.org/@OJ_Astro/116916991519124229

The second paper for this week, also published on Tuesday 14th July in the folder Cosmology and Nongalactic Astrophysics is: “Line-of-sight shear in SLACS strong lenses II: validation tests with an extended sample” by Natalie B. Hogg (U. Cambridge, UK), Daniel P. Johnson (Université de Montpellier, France), Anowar J. Shajib (U. Chicago, USA) and Julien Larena (Montpellier). The study described in this paper models 27 additional gravitational lenses, finding a significant fraction with unexpectedly large line-of-sight shears. Factors like redshift, filter, and signal-to-noise ratio don’t significantly affect shear magnitudes.

The overlay looks like this:

The official version of the paper can be found on arXiv here and the Fediverse announcement here:

https://fediscience.org/@OJ_Astro/116917026598474399

The third paper of the week, published on Wednesday 15th July, again in the folder Cosmology and Nongalactic Astrophysics “Investigating the Dark Energy Constraint from Strongly Lensed AGN at LSST-Scale” by Sydney Erickson (Stanford University, USA) and 13 others on behalf of The LSST Dark Energy Science Collaboration. The study uses a new technique to analyze a large sample of lensed Active Galactic Nuclei, providing an independent probe of dark energy and improving constraints on the Universe’s expansion.

The overlay for this one is here:

The final, accepted version can be found on arXiv here and the Mastodon announcement is here:

https://fediscience.org/@OJ_Astro/116922734297811558

The fourth paper of the week, also published on Wednesday 15th July but in the folder Earth and Planetary Astrophysics is “University of Hawaii 88-inch Telescope Observations of the Interstellar Comet 3I/ATLAS: Spectrophotometric Blue-Sensitive Spectral Time Series Spanning Two Months from Discovery” by W. B. Hoogendam (University of Hawaii, USA) and 24 others from around the world. The study presents observations of the third interstellar object, 3I/ATLAS, using the SuperNova Integral Field Spectrograph, revealing its properties and comparing it to bodies in our solar system.

The overlay for this one is here:

You can read the final version of this one on arXiv here and the Mastodon announcement is here:

https://fediscience.org/@OJ_Astro/116925616134490970

The fifth paper of the week, published on Friday 17th July in the folder Astrophysics of Galaxies, is “The birth of the intracluster medium: the evolution of multiphase gas and Lyman-α haloes in a z~3 simulated protocluster” by Jake S. Bennett (Harvard Smithsonian CfA, USA), Aaron Smith (U. Nottingham, UK), Fabrizio Arrigoni-Battaia (MPA Garching, Germany), Debora Sijacki (U. Cambridge, UK) , Cassandra Lochhaas (CfA) and Lars Hernquist (CfA). This study uses a cosmological simulation to explore the transition from complex galactic haloes to mature galaxy clusters, focusing on gas distribution, ionisation, and emission changes during this evolution.

The overlay for this one is here:

You can read the final version of this one on arXiv here and the Mastodon announcement is here:

https://fediscience.org/@OJ_Astro/116934117289387295

The sixth and final paper of this week is “Density reconstruction from biased tracers: Testing the equivalence principle through consistency relations” by Lawrence Dam and Omar Darwish (Université de Genève, Switzerland). This was published on Friday 17th July in the folder Cosmology and Nongalactic Astrophysics. It proposes using quadratic estimators to test the weak equivalence principle on cosmological scales, offering a practical alternative to the conventional bispectrum approach.

The overlay for this one is here:

You can find the final accepted version on arXiv here and the Mastodon announcement is here:

https://fediscience.org/@OJ_Astro/116934191977670070

As you can see we have now published over 150 papers this year and are just one shy of 600 in total. I expect we’ll pass that milestone next week. I’ll do another update next Saturday.

New Analysis of 3IATLAS Reveals Exciting Origin of the Comet - YouTube
https://www.youtube.com/watch?v=NGxliz1joxY

#Astronomy #Comets #3IATLAS

#ESO:
"
Älter als die Sonne: Astronomen finden neue Hinweise auf den Ursprung des interstellaren Kometen 3I/ATLAS
"
".. VLT .. genutzt, um .. Zusammensetzung v. 3I/ATLAS, d. hellsten jemals beobachteten interstell. Objekt, im Detail zu untersuchen... fanden .. heraus, dass 3I/ATLAS wahrscheinl. aus d. Außenbereichen eines alten Sternensystems stammt. .. .. mehr als doppelt so alt wie d. Sonne .."

https://www.eso.org/public/germany/news/eso2608/

6.7.2026

#3IATLAS #Astronomie #Deuterium #Kohlenstoff #Komet #UVES #VLT

"In a new paper published in Nature today, a team of scientists (led by Martin Cordiner from the NASA Goddard Space Flight Center) have shed fresh light on the comet’s origin. Their results reveal it to be a true galactic fossil, far older than the Solar System."

https://theconversation.com/12-billion-years-old-this-interstellar-comet-is-older-than-our-solar-system-285702

#Comets #Interstellar #Space #3IAtlas

Weekly Update from the Open Journal of Astrophysics 13/06/2026

It’s Saturday again so it’s time for another update of activity at the Open Journal of Astrophysics. Since the last update we have published a further three papers, bringing the number in Volume 9 (2026) to 122 and the total so far published by OJAp up to 570.

I will continue to include the posts made on our Mastodon account (on Fediscience); these announcements also show the DOI for each paper.

The first paper to report this week, published on Thursday 11th June, is “Dancing Streams In Merging Halos: Stellar Streams in a MW–LMC-like merger” by (all based in the USA): Sachi Weerasooriya (Carnegie Observatories), Tjitske Starkenburg (Northwestern U.), Emily C. Cunningham (Columbia U.) & Kathryn V. Johnston (Flatiron Institute). This article explores how galaxy mergers, like the Milky Way-Large Magellanic Cloud merger, significantly alter the properties and structures of stellar streams, challenging the recovery of their initial orbits. It is in the folder marked Astrophysics of Galaxies.

The overlay for this paper is here

You can find the officially accepted version on arXiv here and the announcement on Fediverse here:

https://fediscience.org/@OJ_Astro/116730200889106529

The second paper for this week, also published on Thursday 11th June but in the folder Cosmology and Nongalactic Astrophysics is “X-SORTER (X-ray Survey Of meRging clusTErs in Redmapper): X-ray and Spectroscopic Characterization of 12 Optically Selected Galaxy Cluster Merger Candidates” by Christopher Hopp, David Wittman, Rodrigo Stancioli, Zhuoran Gao & Faik Bouhrik (UC Davis) and Scott Adler (Rochester), all based in the USA. The X-SORTER program identifies merging galaxy clusters to study dark matter interactions, using optical indicators and X-ray observations. This method efficiently identifies active clusters suitable for detailed dark matter studies.

The overlay for this one looks like this:

The official version of the paper can be found on arXiv here and the Fediverse announcement here:

https://fediscience.org/@OJ_Astro/116730279994960097

The third and final paper of the week, published on Friday 12th June in the folder Earth and Planetary Astrophysics, is “JCMT Constraints on the Early-Time HCN and CO Emission and HCN Temporal Evolution of 3I/ATLAS” by Jason T. Hinkle (U. Illinois, USA) and 6 others based in the USA and Chile. This article presents observations of the third Interstellar Object, 3I/ATLAS, providing early sub-mm constraints on its activity. The findings suggest a steeper production rate slope than typical Solar System comets.

The overlay for this one is here:

The final, accepted version can be found on arXiv here and the Mastodon announcement is here:

https://fediscience.org/@OJ_Astro/116735805179724489

And that concludes this week’s update. It has been a slow week on the publishing front, but the main reason is that we have a big backlog of papers accepted but waiting for the authors to put their final versions on arXiv and we can’t do anything about that! I’ll do another update next Saturday.

#DerStandard:
"
Der interstellare Komet 3I/Atlas stammt aus einem völlig andersartigen System
"
"Der dritte interstellare Besucher in unserem Sonnensystem liefert neue Überraschungen. Seine Zusammensetzung unterscheidet sich von allen bekannten Kometen"

https://www.derstandard.at/story/3000000317869/der-interstellare-komet-3iatlas-stammt-aus-einem-voellig-andersartigen-system?ref=niewidget

23.4.2026

#3IAtlas #Astronomie #Astrophysik #Deuterium #Komet #Milchstraße #Sonnensystem

🌠 ¡Agua detectada en el cometa interestelar 3I/ATLAS!
La sonda JUICE captó emisiones de H₂O en su coma apenas 4 días después del perihelio. El cometa produce ~6,6 × 10²⁸ moléculas de agua por segundo, liberadas directamente desde su núcleo.

Water detected in interstellar comet 3I/ATLAS!
The JUICE spacecraft captured H₂O emissions in its coma just 4 days after perihelion. The comet produces ~6.6 × 10²⁸ water molecules per second, released directly from its nucleus.

Apă detectată în cometa interstelară 3I/ATLAS!
Sonda JUICE a captat emisii de H₂O în coma acesteia la doar 4 zile după periheliu. Cometa produce ~6,6 × 10²⁸ molecule de apă pe secundă, eliberate direct din nucleul său.

#3IATLAS #Cometa #Astronomía #JUICE #Ciencia #ATel
#Comet #Astronomy #Science
#Cometă #Astronomie #Știință

https://www.astronomerstelegram.org/?read=17726

3I Atlas registró eventos extraños al salir de nuestro sistema solar. Hay quienes lo admiten y otros guardan silencio. ¿Gustas enterarte de más? Gracias y dando clic... (https://www.eldebate.com/ciencia/20260130/3iatlas-registro-inesperado-evento-alejarse-sistema-solar-mientras-cia-guarda-silencio_379634.html) #3IAtlas #science #astronomy #horusruisecojacobo #xdom #atlas #cometa #ciencia #descubrimiento

#3IATLAS #cometa #interstellar #NASA #AviLoeb #Oumuamua #Borisov #UFO #alieni #astronavi

Cometa 3I/ATLAS chega à sua menor distância da Terra e diz adeus

https://fed.brid.gy/r/https://iclnoticias.com.br/interestelar-sem-rumo-sem-risco-cometa-3i-atlas/

🌌 Un visitante de las estrellas se acerca a la Tierra

Este viernes 19 de diciembre, el cometa interestelar 3I/ATLAS realizará su paso más cercano a nuestro planeta. Este es solo el tercer objeto confirmado en la historia.

🔭 Descubre cómo seguir su trayectoria en vivo y por qué este evento es clave para la astronomía.

#Astronomía #Espacio #Cometa #3IATLAS #Ciencia #Tutiempo #NASA

Lee la noticia completa aquí 👇
https://www.tutiempo.net/noticias/cometa-interestelar-3i-atlas-se-aproxima-a-la-tierra.html

Nasa abre o jogo sobre cometa interestelar misterioso e revela novas imagens do visitante de fora do Sistema Solar

https://web.brid.gy/r/https://www.abcmais.com/mundo/nasa-abre-o-jogo-sobre-cometa-interestelar-misterioso-e-revela-novas-imagens-sobre-visitante-de-fora-do-sistema-solar/

Avi Loeb Speculates 3I/ATLAS Could Be A Probe By Aliens Monitoring Us: ‘Maybe They’re Unhappy’

https://web.brid.gy/r/https://in.mashable.com/science/102196/avi-loeb-speculates-3iatlas-could-be-a-probe-by-aliens-monitoring-us-maybe-theyre-unhappy

Should we prepare for alien invasion? The curious case of 3I/ATLAS and what it might mean
https://atlas.whatip.xyz/post.php?slug=should-we-prepare-for-alien-invasion-the-curious-case-of-3iatlas-and-what-it-might-mean
"3I/ATLAS: A Cosmic Enigma or Alien Intruder? Prepare for the Unexpected!"
#space #astronomy #alieninvasion #3iatlas #extraterrestrial

Cometa interestelar 3I/ATLAS: Objeto incomum de origem misteriosa pode conter segredos sobre outros mundos e intriga cientistas

https://web.brid.gy/r/https://www.abcmais.com/mundo/cometa-interestelar-3i-atlas-objeto-incomum-de-origem-misteriosa-pode-conter-segredos-sobre-outros-mundos-e-intriga-cientistas/

Chiamatela "difesa planetaria segreta", "minaccia aliena nascosta" o "attivazione di protocolli". Tanto fa audience. La verità sulla cometa 3I/ATLAS? Un bollettino tecnico trasformato in thriller da testate che vendono clickbait mascherato da divulgazione. I titoli acchiappa-clic vendono meglio dei fatti. Già, i fatti: casomai interessassero ancora a qualcuno, ve li espongo qui.

https://www.futuroprossimo.it/2025/10/una-campagna-segreta-su-3i-atlas-alimenta-le-teorie-online

#futuroprossimo #3IATLAS #clickbait #disinformazione #spazio #cometa #CometaAtlas #Atlas

Il telescopio Swift della NASA ha catturato qualcosa che non dovrebbe esistere: acqua che evapora da 3I/ATLAS a 450 milioni di km dal Sole, tre volte la distanza Terra-Sole. A quella distanza le comete dormono. Lei no. Rilascia 40 kg d'acqua al secondo dove il ghiaccio dovrebbe restare congelato. Ogni visitatore interstellare riscrive le regole: 'Oumuamua era secco, Borisov piena di CO, e ora questa!

https://www.futuroprossimo.it/2025/10/scoperta-acqua-su-3i-atlas-la-cometa-che-non-segue-le-regole

#futuroprossimo #3IATLAS #cometa #spazio