#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) -
3I/ATLAS: Gemini Observatory Captures Exocomet On Its Approach To Earth And It Is Glowing Green; Here’s Why
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Finally an RGB image of comet #3IATLAS from images taken by #GeminiNorth during the 26 November #shadowTheScientists session: https://noirlab.edu/public/news/noirlab2532/ - the coma has become bluer due to more gas emission. Also published today: an X-ray image by XMM-Newton at https://www.esa.int/ESA_Multimedia/Images/2025/12/XMM-Newton_sees_comet_3I_ATLAS_in_X-ray_light with explanations in http://www.cbat.eps.harvard.edu/iau/cbet/005600/CBET005646.txt which also contains more 3I news.
Meanwhile the paper https://iopscience.iop.org/article/10.3847/2515-5172/ae2915 claims an upper limit for 3I's nucleus diameter of only some 750 meters from the measured non-gravitational acceleration (NGA) parameters: that would be waaay more stringent than the 5.6 km upper limit from early Hubble observations reported in https://iopscience.iop.org/article/10.3847/2041-8213/adf8d8 (where also a lower limit of 440 meters is stated).
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And here is a recording of the #ShadowTheScientists live observation of interstellar comet #3IATLAS with #GeminiNorth a few hours ago: https://www.youtube.com/watch?v=cW0chiPZyYM
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And here is what comet #3IATLAS looks like for the #geminiNorth Integral Field Unit (IFU) taking numerous spectra from points across the coma - from #ShadowTheScientists
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What a #GeminiNorth #3IATLAS spectrum looks like - as raw as it gets, from the #shadowTheScientists session. See https://www.astronomerstelegram.org/?read=17503 for a pre-perihelion spectrum.
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The #GeminiNorth telescopes is observing the interstellar comet #3IATLAS right now: here is the acquisition image from moments ago, spectra to be taken now - from the #ShadowTheScientists session.