#3iatlas — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #3iatlas, aggregated by home.social.
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Hello @[email protected] #EPSC2026 here in Den Haag! Looking forward the #3I/Atlas keynote today, plus I will be presenting some @[email protected] related-work in the small body dynamics session SB12 later, and I also have another talk Thurs. Gonna be a busy week! #PlanetSci
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2026-09-07 00:00:00 UTC (Delta: 2026-09-06)
INTERSTELLAR VISITOR: 3I/ATLAS
- Barycentric speed: 59.36 km/s (-0.00 km/s)
- Crossing Uranus's orbit in: 231 days🌎 Relative to Earth
- Distance (km): 1,725,548,261.22 km (+2,871,595.04 km)
- Distance (AU): 11.53 (+0.02)
- Light travel time: 1 h 35 min 55.81 s (+9.58 s) -
2026-09-06 00:00:00 UTC (Delta: 2026-09-05)
INTERSTELLAR VISITOR: 3I/ATLAS
- Barycentric speed: 59.36 km/s (-0.00 km/s)
- Crossing Uranus's orbit in: 232 days🌎 Relative to Earth
- Distance (km): 1,722,676,666.18 km (+2,896,760.51 km)
- Distance (AU): 11.52 (+0.02)
- Light travel time: 1 h 35 min 46.23 s (+9.66 s) -
2026-09-06 00:00:00 UTC (Delta: 2026-09-05)
INTERSTELLAR VISITOR: 3I/ATLAS
- Barycentric speed: 59.36 km/s (-0.00 km/s)
- Crossing Uranus's orbit in: 232 days🌎 Relative to Earth
- Distance (km): 1,722,676,666.18 km (+2,896,760.51 km)
- Distance (AU): 11.52 (+0.02)
- Light travel time: 1 h 35 min 46.23 s (+9.66 s) -
2026-09-06 00:00:00 UTC (Delta: 2026-09-05)
INTERSTELLAR VISITOR: 3I/ATLAS
- Barycentric speed: 59.36 km/s (-0.00 km/s)
- Crossing Uranus's orbit in: 232 days🌎 Relative to Earth
- Distance (km): 1,722,676,666.18 km (+2,896,760.51 km)
- Distance (AU): 11.52 (+0.02)
- Light travel time: 1 h 35 min 46.23 s (+9.66 s) -
2026-09-06 00:00:00 UTC (Delta: 2026-09-05)
INTERSTELLAR VISITOR: 3I/ATLAS
- Barycentric speed: 59.36 km/s (-0.00 km/s)
- Crossing Uranus's orbit in: 232 days🌎 Relative to Earth
- Distance (km): 1,722,676,666.18 km (+2,896,760.51 km)
- Distance (AU): 11.52 (+0.02)
- Light travel time: 1 h 35 min 46.23 s (+9.66 s) -
2026-09-06 00:00:00 UTC (Delta: 2026-09-05)
INTERSTELLAR VISITOR: 3I/ATLAS
- Barycentric speed: 59.36 km/s (-0.00 km/s)
- Crossing Uranus's orbit in: 232 days🌎 Relative to Earth
- Distance (km): 1,722,676,666.18 km (+2,896,760.51 km)
- Distance (AU): 11.52 (+0.02)
- Light travel time: 1 h 35 min 46.23 s (+9.66 s) -
2026-09-05 00:00:00 UTC (Delta: 2026-09-04)
INTERSTELLAR VISITOR: 3I/ATLAS
- Barycentric speed: 59.37 km/s (-0.00 km/s)
- Crossing Uranus's orbit in: 233 days🌎 Relative to Earth
- Distance (km): 1,719,779,905.66 km (+2,922,475.93 km)
- Distance (AU): 11.50 (+0.02)
- Light travel time: 1 h 35 min 36.57 s (+9.75 s) -
2026-09-05 00:00:00 UTC (Delta: 2026-09-04)
INTERSTELLAR VISITOR: 3I/ATLAS
- Barycentric speed: 59.37 km/s (-0.00 km/s)
- Crossing Uranus's orbit in: 233 days🌎 Relative to Earth
- Distance (km): 1,719,779,905.66 km (+2,922,475.93 km)
- Distance (AU): 11.50 (+0.02)
- Light travel time: 1 h 35 min 36.57 s (+9.75 s) -
2026-09-05 00:00:00 UTC (Delta: 2026-09-04)
INTERSTELLAR VISITOR: 3I/ATLAS
- Barycentric speed: 59.37 km/s (-0.00 km/s)
- Crossing Uranus's orbit in: 233 days🌎 Relative to Earth
- Distance (km): 1,719,779,905.66 km (+2,922,475.93 km)
- Distance (AU): 11.50 (+0.02)
- Light travel time: 1 h 35 min 36.57 s (+9.75 s) -
2026-09-05 00:00:00 UTC (Delta: 2026-09-04)
INTERSTELLAR VISITOR: 3I/ATLAS
- Barycentric speed: 59.37 km/s (-0.00 km/s)
- Crossing Uranus's orbit in: 233 days🌎 Relative to Earth
- Distance (km): 1,719,779,905.66 km (+2,922,475.93 km)
- Distance (AU): 11.50 (+0.02)
- Light travel time: 1 h 35 min 36.57 s (+9.75 s) -
2026-09-05 00:00:00 UTC (Delta: 2026-09-04)
INTERSTELLAR VISITOR: 3I/ATLAS
- Barycentric speed: 59.37 km/s (-0.00 km/s)
- Crossing Uranus's orbit in: 233 days🌎 Relative to Earth
- Distance (km): 1,719,779,905.66 km (+2,922,475.93 km)
- Distance (AU): 11.50 (+0.02)
- Light travel time: 1 h 35 min 36.57 s (+9.75 s) -
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.
#3IAtlas #ActiveGalacticNuclei #arXiv251013803v2 #arXiv251113669v3 #arXiv251205050v2 #arXiv251209020v2 #arXiv260316991v2 #arXiv260419463v2 #AstrophysicsOfGalaxies #biasedGalaxyFormation #CircumgalacticMedium #cosmologicalParameters #cosmologicalSimulations #Cosmology #CosmologyAndNonGalacticAstrophysics #covarianceMatrices #DarkEnergySpectroscopicInstrument #DensityReconstruction #DESI #DiamondOpenAccess #DiamondOpenAccessPublishing #EarthAndPlanetaryAstrophysics #equivalencePrinciple #galaxyClusters #galaxyHaloes #interstellarComets #lineOfSightShear #LSSTDarkEnergyScienceCollaboration #LymanAlpha #OpenAccess #OpenAccessPublishing #protoclusters #SLACS #statisticalCosmology #strongGravitationalLensing -
Elon Musk Asks ‘Where Are Aliens?’ Amid Ongoing UFO Disclosure; Harvard Astrophysicist Avi Loeb Reacts
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When 4 "Coincidences" Stop Being Coincidences
A 5.6km object is heading toward Jupiter with four characteristics that break the rules:
🎯 Targeting precision - Arriving at the exact gravitational boundary used for orbital insertion (1 in 25,000 odds)
⚖️ Impossible density - Would need to be lighter than cotton candy while staying intact (physics violation) (or hollow)
🔬 Industrial chemistry - Spectral signature matches refined aerospace alloys, not space ice
🎮 Active control - Jets that defy rotational physics without stabilization systems
Combined probability: <1 in 100,000
But that is just a number, let's visualise 1:100000;3I/ATLAS arriving at Jupiter's Hill sphere boundary after a course correction is like watching five cars in a row all have license plates ending in 777 - while they're all driving to the same address - and they all arrived exactly on time.
Or
Three spins of a Roulette Wheel landing on the same number.
March 2026 Jupiter encounter = the moment of truth.
My prediction: Something totally anomalous will happen which will either be under-reported or, totally ignored or misrepresented. Can't wait!And in a new paper NASA documents how it shut down ("contingency mode") it's TESS probe just when it could have gathered precise data about #3iAtlas (https://arxiv.org/abs/2601.21569)
#space #coincidence #spaceship #nhi #nhe #uap #phenomenon #astronomy
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How the buzz over an ‘alien’ interstellar comet went viral
Is an interstellar spacecraft zooming through our solar system? That’s the big question for fans of unidentified flying objects — and for a researcher at the University of Washington who analyzed the speculation over the interstellar com
https://cosmiclog.com/2025/12/06/how-the-buzz-over-an-alien-interstellar-comet-went-viral/
#GeekWire #3IATLAS #A11pl3Z #Aliens #InterstellarObjects #SocialMedia #Space #UniversityOfWashington -
NASA comparte fotos del cometa 3I/ATLAS de múltiples misiones
La NASA anunció un evento en vivo para compartir imágenes inéditas del cometa interestelar 3I/ATLAS , el tercer objeto de este tipo en el sistema solar, captadas por diversas misiones. El cometa, que no representa una amenaza para la Tierra, fue observado desde naves espaciales y telescopios, incluyendo aquellas en órbita alrededor de Marte, brindando una oportunidad única para estudiar su comportamiento y composición (Fuente NASA).
La NASA informó sobre un evento en vivo (realizado el 19 de noviembre a las 3 pm EST) para presentar y discutir imágenes del cometa interestelar 3I/ATLAS , capturadas por una variedad de activos científicos de la agencia.
https://www.youtube.com/live/A55SUq2eDXg?si=_bglOpO7_s-mzl88
Galeria de imágenes publicadas por NASA.
El Objeto Interestelar
- Descubrimiento: El cometa 3I/ATLAS fue descubierto el 1 de julio por el observatorio ATLAS (Asteroid Terrestrial-impact Last Alert System), financiado por la NASA.
- Significado: Es el tercer objeto identificado que ingresa a nuestro sistema solar procedente de otra parte de la galaxia.
- Trayectoria: Aunque no representa una amenaza para la Tierra (no se acercará a menos de 273 millones de kilómetros), el cometa pasó a solo 30 millones de kilómetros de Marte a principios de octubre.
La Campaña de Observación de la NASA
La NASA ha utilizado una amplia gama de instrumentos complementarios, tanto en el espacio como en la tierra, para observar a 3I/ATLAS, una oportunidad única para estudiarlo desde diferentes ángulos y con diversos métodos científicos.
- Telescopio Hubble: Una de las imágenes clave fue captada por el Telescopio Espacial Hubble el 21 de julio de 2025. La imagen mostró que el cometa tiene una envoltura de polvo ( coma ) en forma de lágrima que se desprende de su núcleo sólido y helado.
- Misiones en Marte: Las naves espaciales en la órbita de Marte se encontraban en una posición privilegiada para la observación, dada la proximidad del cometa al planeta rojo.
El evento en vivo se transmitió a través de NASA+, la aplicación de la NASA, su sitio web, YouTube y Amazon Prime, contando con la participación de altos funcionarios de la sede central de la NASA y la Dirección de Misiones Científicas.
#3iatlas #arielmcorg #astronomia #atlas #cienciaespacial #cometainterestelar #espacio #hubble #infosertec #marte #nasa #portada
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3I/ATLAS Comet Unveils Unprecedented Radio Signal: Experts Are Baffled
https://atlas.whatip.xyz/post.php?slug=3iatlas-comet-unveils-unprecedented-radio-signal-experts-are-baffled
Quick take: In a surprising turn of events
#space #astronomy #3iatlas #radiosignal #cosmicwanderer -
#CGTN:
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China's Tianwen-1 Mars orbiter captures image of interstellar object older than the solar system
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"Using its high-resolution camera, China's Tianwen-1 orbiter has successfully observed the interstellar object 3I/ATLAS at a distance of about 30 million kilometers, according to the China National Space Administration (CNSA)."6.11.2025
#3IATLAS #China #CNSA #C2025N1 #comet #Himmelskörper #Komet #Raumfahrt #Raumsonde #SpaceFlight #Tianwen1
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Der Komet 3I/ATLAS kommt der Erde im Dezember am nächsten. Harvard-Professor Loeb schreibt, es könnte auch ein Ufo sein.#3IATLAS #Komet #Alien #Aliens #Raumschiff #Sonnensystem #Loeb
3I/ATLAS ist wohl kein Alien-Raumschiff - sondern ein Komet -
VLT maakt nieuwe beelden van de interstellaire komeet 3I/ATLAS
Astronomen hebben met behulp van de Very Large Telescope nieuwe beelden gemaakt van 3I/ATLAS, het derde interstellaire object dat ooit is waargenomen.
Deze VLT/FORS2 afbeelding, gemaakt op 3 juli 2025, toont de interstellaire komeet 3I/ATLAS.
https://www.kuuke.nl/vlt-maakt-nieuwe-beelden-van-de-interstellaire-komeet-3i-atlas/
#3IATLAS #A11pl3Z #C2025N1 #eso #InterstellairObject #InterstellaireKomeet #komeet #VLT
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#DerStandard:
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Mysteriöses Objekt dürfte der dritte Besucher aus dem interstellaren Raum seinDer Komet 3I/Atlas wurde am 1. Juli entdeckt und stammt wohl aus einem anderen Sonnensystem.
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https://www.derstandard.at/story/3000000277868/mysterioeses-objekt-duerfte-der-dritte-besucher-aus-dem-interstellaren-raum-sein".. Objekt 1I/Oumuamua von 2017 aufgrund seiner länglichen Form und eines offensichtlichen Antriebs .." Huh? Oh, äh ... Nö.
3.7.2025
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Sadly it appears the official name is 3I/ATLAS – I mean even just going with 3I/Sauce would've been more entertaining. Oh well.
I'm still disappointed that interstellar objects get the "I" (letter eye) prefix though. I mean, any astute techy person knows you don't use G, O, or I in alphanumeric handles/names because they look like numeric 6, zero and one or lowercase L. It creates ambiguity that nobody wants.
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Renders of the 3 interstellar objects on their day of discovery using the Catalina Sky Survey Orbit Viewer. Thx to @Apophis for that tool!
