suteki
@suteki-chan.bsky.social
interested in astrophysics, astronomy, and cosmology
Reposted by suteki
For 3I/ATLAS's closest approach to Earth, have an accepted paper: as it got closer to the Sun, 3I's production of atomic nickel and iron in its coma evolved to a ratio like that of Solar System comets and 2I ☄️🔭
Hutsemékers et al. A&A arxiv.org/abs/2509.26053
Hutsemékers et al. A&A arxiv.org/abs/2509.26053
Pre-perihelion evolution of the NiI/FeI abundance ratio in the coma of the interstellar comet 3I/ATLAS. From extreme to normal
Emission lines of FeI and NiI are commonly found in the coma of Solar System comets, even at large heliocentric distances. These atoms are most likely released from the surface of the comet's nucleus ...
arxiv.org
December 19, 2025 at 7:10 PM
For 3I/ATLAS's closest approach to Earth, have an accepted paper: as it got closer to the Sun, 3I's production of atomic nickel and iron in its coma evolved to a ratio like that of Solar System comets and 2I ☄️🔭
Hutsemékers et al. A&A arxiv.org/abs/2509.26053
Hutsemékers et al. A&A arxiv.org/abs/2509.26053
Reposted by suteki
Here is the arrangement of the solar system today, Dec 19. Our interstellar visitor, 3I/ATLAS, is on its way out of the solar system - the next close approach will be with Juno at Jupiter in March - but _today_ will be the day it comes closest to Earth - alas, not very close at 1.8 AU away.
December 19, 2025 at 4:13 AM
Here is the arrangement of the solar system today, Dec 19. Our interstellar visitor, 3I/ATLAS, is on its way out of the solar system - the next close approach will be with Juno at Jupiter in March - but _today_ will be the day it comes closest to Earth - alas, not very close at 1.8 AU away.
Reposted by suteki
Nice image of our interstellar visitor 3I/ATLAS from Dan Bartlett in California and the comet-ml. Note that the coma is green and there is a blue tail and anti-tail. This is from a 2 hour exposure.
December 15, 2025 at 6:45 PM
Nice image of our interstellar visitor 3I/ATLAS from Dan Bartlett in California and the comet-ml. Note that the coma is green and there is a blue tail and anti-tail. This is from a 2 hour exposure.
Reposted by suteki
NASA lost contact with the MAVEN spacecraft orbiting Mars on Saturday.
They're working the problem in an attempt to reestablish contact with MAVEN.
There's no reason right now to suspect the spacecraft has been lost. It's just not phoning home when it should be.
science.nasa.gov/blogs/maven/...
They're working the problem in an attempt to reestablish contact with MAVEN.
There's no reason right now to suspect the spacecraft has been lost. It's just not phoning home when it should be.
science.nasa.gov/blogs/maven/...
NASA Teams Work MAVEN Spacecraft Signal Loss - NASA Science
NASA’s MAVEN (Mars Atmosphere and Volatile EvolutioN) spacecraft, in orbit around Mars, experienced a loss of signal with ground stations on Earth on Dec. 6.
science.nasa.gov
December 10, 2025 at 3:27 AM
NASA lost contact with the MAVEN spacecraft orbiting Mars on Saturday.
They're working the problem in an attempt to reestablish contact with MAVEN.
There's no reason right now to suspect the spacecraft has been lost. It's just not phoning home when it should be.
science.nasa.gov/blogs/maven/...
They're working the problem in an attempt to reestablish contact with MAVEN.
There's no reason right now to suspect the spacecraft has been lost. It's just not phoning home when it should be.
science.nasa.gov/blogs/maven/...
Reposted by suteki
The number of observations per day of our interstellar visitor, 3I/ATLAS. After its passage behind the Sun, the observation count is rising as we near its closest approach to the Earth on Dec. 19. By January, it will start dropping as it leaves the solar system.
December 13, 2025 at 4:30 PM
The number of observations per day of our interstellar visitor, 3I/ATLAS. After its passage behind the Sun, the observation count is rising as we near its closest approach to the Earth on Dec. 19. By January, it will start dropping as it leaves the solar system.
Reposted by suteki
Some have argued to me strongly that even if Loeb is wrong, he’s getting people interested in 3I/ATLAS and that’s a good thing for science.
But Loeb isn't just wrong, he's recklessly following an old playbook that got 39 people killed in 1997.
sites.psu.edu/astrowright/...
But Loeb isn't just wrong, he's recklessly following an old playbook that got 39 people killed in 1997.
sites.psu.edu/astrowright/...
Loeb’s Behavior is Reckless
I’ve largely ignored Loeb for the past few weeks. When he started in on his 3I/ATLAS thing, there were plenty of mainstream media outlets willing to give his claims a wide and credulous platform, and ...
sites.psu.edu
December 7, 2025 at 5:52 PM
Some have argued to me strongly that even if Loeb is wrong, he’s getting people interested in 3I/ATLAS and that’s a good thing for science.
But Loeb isn't just wrong, he's recklessly following an old playbook that got 39 people killed in 1997.
sites.psu.edu/astrowright/...
But Loeb isn't just wrong, he's recklessly following an old playbook that got 39 people killed in 1997.
sites.psu.edu/astrowright/...
Reposted by suteki
The interstellar visitor 3I/ATLAS ☄️ cruising through our Solar System is no alien spaceship and won't hit Earth.
Still, the buzz around it is far from unfounded 🤩
Discover why with #ChasingStarlight: https://www.youtube.com/watch?v=YtiqLxfSiVI
🔭 🧪
Still, the buzz around it is far from unfounded 🤩
Discover why with #ChasingStarlight: https://www.youtube.com/watch?v=YtiqLxfSiVI
🔭 🧪
December 5, 2025 at 10:03 AM
The interstellar visitor 3I/ATLAS ☄️ cruising through our Solar System is no alien spaceship and won't hit Earth.
Still, the buzz around it is far from unfounded 🤩
Discover why with #ChasingStarlight: https://www.youtube.com/watch?v=YtiqLxfSiVI
🔭 🧪
Still, the buzz around it is far from unfounded 🤩
Discover why with #ChasingStarlight: https://www.youtube.com/watch?v=YtiqLxfSiVI
🔭 🧪
Reposted by suteki
Hubble went back to observe interstellar comet #3I/ATLAS on 30 November. At the time, the comet was about 286 million kilometres from Earth 👉 www.esa.int/ESA_Multimed...
Hubble tracked the comet as it moved across the sky. That's why background stars appear as streaks of light. 🔭 🧪
Hubble tracked the comet as it moved across the sky. That's why background stars appear as streaks of light. 🔭 🧪
December 5, 2025 at 9:42 AM
Hubble went back to observe interstellar comet #3I/ATLAS on 30 November. At the time, the comet was about 286 million kilometres from Earth 👉 www.esa.int/ESA_Multimed...
Hubble tracked the comet as it moved across the sky. That's why background stars appear as streaks of light. 🔭 🧪
Hubble tracked the comet as it moved across the sky. That's why background stars appear as streaks of light. 🔭 🧪
Reposted by suteki
Still no aliens...
☄️🔭
☄️🔭
The stanning of interstellar comet 3I/ATLAS in this account continues
Image credit: Victor Sabet, Julien De Winter
Image credit: Victor Sabet, Julien De Winter
December 5, 2025 at 3:43 PM
Still no aliens...
☄️🔭
☄️🔭
Reposted by suteki
Reposted by suteki
When looking at a picture of a comet for faint activity, I suggest applying a low-pass filter.
I personally do this by looking at the picture without my glasses.
I personally do this by looking at the picture without my glasses.
☄️ Our #ESAJuice team couldn't wait until February, when they will receive data on #3IATLAS from the mission's science instruments.
So they downloaded just a quarter of an image from its navigation camera to get a surprise sneak preview.
More info and annotations 👉 www.esa.int/ESA_Multimed...
🔭 🧪
So they downloaded just a quarter of an image from its navigation camera to get a surprise sneak preview.
More info and annotations 👉 www.esa.int/ESA_Multimed...
🔭 🧪
December 4, 2025 at 2:59 PM
When looking at a picture of a comet for faint activity, I suggest applying a low-pass filter.
I personally do this by looking at the picture without my glasses.
I personally do this by looking at the picture without my glasses.
Reposted by suteki
This is a reminder that UFOs are a social phenomenon based around people misunderstanding what they see.
And it is a mistake for astronomers and other scientists to pretend otherwise.
And it is a mistake for astronomers and other scientists to pretend otherwise.
December 1, 2025 at 8:13 PM
This is a reminder that UFOs are a social phenomenon based around people misunderstanding what they see.
And it is a mistake for astronomers and other scientists to pretend otherwise.
And it is a mistake for astronomers and other scientists to pretend otherwise.
Reposted by suteki
3I has been a thought-provoking practice run in a number of ways... How exciting would it be if we get to point CoCa at an ISO!
Today and tomorrow we’re having the science team meeting of the CoCa instrument on @cometinterceptor.bsky.social. CoCa (Comet Camera) is the main high resolution camera on the mission. We‘ll be discussing calibration and how to get maximum science return.
November 28, 2025 at 9:55 AM
3I has been a thought-provoking practice run in a number of ways... How exciting would it be if we get to point CoCa at an ISO!
Reposted by suteki
"The Ramses mission, to be built on a tight schedule to intercept the asteroid Apophis on its close encounter with Earth in 2029 is funded, and will help to prepare for future potentially hazardous asteroids."
Congratulations and good luck to everyone on the Ramses team!
www.esa.int/About_Us/Cor...
Congratulations and good luck to everyone on the Ramses team!
www.esa.int/About_Us/Cor...
ESA Member States commit to largest contributions at Ministerial
The largest contributions in the history of the European Space Agency, €22.1 bn, have been approved at its Council meeting at Ministerial level in Bremen, ...
www.esa.int
November 28, 2025 at 3:55 PM
"The Ramses mission, to be built on a tight schedule to intercept the asteroid Apophis on its close encounter with Earth in 2029 is funded, and will help to prepare for future potentially hazardous asteroids."
Congratulations and good luck to everyone on the Ramses team!
www.esa.int/About_Us/Cor...
Congratulations and good luck to everyone on the Ramses team!
www.esa.int/About_Us/Cor...
Reposted by suteki
Now it can (finally) be told. We've been tracking Comet 3I more or less continuously with PUNCH. Everything is fine. 3I is definitely very interesting – but it is most definitely *not* an alien spaceship undergoing maneuvers, no matter what that Boston guy says. ☀️🛰️🔭🧪 #3I #comet #not_aliens
NASA’s PUNCH Spies Interstellar Comet 3I/ATLAS - NASA Science
NASA’s PUNCH (Polarimeter to Unify the Corona and Heliosphere) mission observed interstellar comet 3I/ATLAS during its passage through the
science.nasa.gov
November 19, 2025 at 9:44 PM
Now it can (finally) be told. We've been tracking Comet 3I more or less continuously with PUNCH. Everything is fine. 3I is definitely very interesting – but it is most definitely *not* an alien spaceship undergoing maneuvers, no matter what that Boston guy says. ☀️🛰️🔭🧪 #3I #comet #not_aliens
Reposted by suteki
Apophis cannot impact Earth any time between now and 2150, and we will be able to rule out potential impacts further into the future after 2029.
And none of the planned Apophis missions will significantly change its trajectory.
That has been very carefully checked: planettreky.com/wp-content/u...
And none of the planned Apophis missions will significantly change its trajectory.
That has been very carefully checked: planettreky.com/wp-content/u...
planettreky.com
November 28, 2025 at 10:23 PM
Apophis cannot impact Earth any time between now and 2150, and we will be able to rule out potential impacts further into the future after 2029.
And none of the planned Apophis missions will significantly change its trajectory.
That has been very carefully checked: planettreky.com/wp-content/u...
And none of the planned Apophis missions will significantly change its trajectory.
That has been very carefully checked: planettreky.com/wp-content/u...
Reposted by suteki
Skeptic magazine publisher Michael Shermer has a $1000 bet with Avi Loeb that…
Discovery or disclosure of alien visitation to Earth in the form of UFOs, UAPs, or any other technological artifact or alien biological form, will not happen by December 31, 2030.
Discovery or disclosure of alien visitation to Earth in the form of UFOs, UAPs, or any other technological artifact or alien biological form, will not happen by December 31, 2030.
November 25, 2025 at 11:26 PM
Skeptic magazine publisher Michael Shermer has a $1000 bet with Avi Loeb that…
Discovery or disclosure of alien visitation to Earth in the form of UFOs, UAPs, or any other technological artifact or alien biological form, will not happen by December 31, 2030.
Discovery or disclosure of alien visitation to Earth in the form of UFOs, UAPs, or any other technological artifact or alien biological form, will not happen by December 31, 2030.
Reposted by suteki
3 years ago, NASA crashed the DART spacecraft into an asteroid at 22,000 kilometers per hour. The event changed the asteroid's orbit and tilt & sent it tumbling.
A nearby cubesat captured these remarkable images of the asteroid immediately after the impact. 🧪🔭
aasnova.org/2025/11/03/s...
A nearby cubesat captured these remarkable images of the asteroid immediately after the impact. 🧪🔭
aasnova.org/2025/11/03/s...
November 19, 2025 at 4:12 AM
3 years ago, NASA crashed the DART spacecraft into an asteroid at 22,000 kilometers per hour. The event changed the asteroid's orbit and tilt & sent it tumbling.
A nearby cubesat captured these remarkable images of the asteroid immediately after the impact. 🧪🔭
aasnova.org/2025/11/03/s...
A nearby cubesat captured these remarkable images of the asteroid immediately after the impact. 🧪🔭
aasnova.org/2025/11/03/s...
Reposted by suteki
It is a very interesting dot.
"NASA to Share Comet 3I/ATLAS Images From Spacecraft, Telescopes"
www.nasa.gov/news-release...
(Again, raw images of 3I from NASA spaceccraft have been available - these are the processed images with expert commentary.)
"NASA to Share Comet 3I/ATLAS Images From Spacecraft, Telescopes"
www.nasa.gov/news-release...
(Again, raw images of 3I from NASA spaceccraft have been available - these are the processed images with expert commentary.)
NASA to Share Comet 3I/ATLAS Images From Spacecraft, Telescopes - NASA
NASA will host a live event at 3 p.m. EST, Wednesday, Nov. 19, to share imagery of the interstellar comet 3I/ATLAS collected by a number of the agency’s
www.nasa.gov
November 17, 2025 at 10:11 PM
It is a very interesting dot.
"NASA to Share Comet 3I/ATLAS Images From Spacecraft, Telescopes"
www.nasa.gov/news-release...
(Again, raw images of 3I from NASA spaceccraft have been available - these are the processed images with expert commentary.)
"NASA to Share Comet 3I/ATLAS Images From Spacecraft, Telescopes"
www.nasa.gov/news-release...
(Again, raw images of 3I from NASA spaceccraft have been available - these are the processed images with expert commentary.)
Reposted by suteki
NASA will have a live event this Wednesday to share imagery of the interstellar comet 3I/ATLAS collected by a number of the agency’s missions.
www.nasa.gov/news-release...
www.nasa.gov/news-release...
NASA to Share Comet 3I/ATLAS Images From Spacecraft, Telescopes - NASA
NASA will host a live event at 3 p.m. EST, Wednesday, Nov. 19, to share imagery of the interstellar comet 3I/ATLAS collected by a number of the agency’s
www.nasa.gov
November 18, 2025 at 2:12 AM
NASA will have a live event this Wednesday to share imagery of the interstellar comet 3I/ATLAS collected by a number of the agency’s missions.
www.nasa.gov/news-release...
www.nasa.gov/news-release...
Reposted by suteki
More about Avi Loeb embarrassing himself and, by proxy, the astronomical community.
Avi Loeb's calculations about 3I/ATLAS are 100% wrong because he has never understood that dust in the tail(s) responds to solar radiation pressure. Solar wind shapes the ion tail. But the radiation pressure is about 1000 times larger than the solar wind ram pressure, for particles that feel it.
November 17, 2025 at 11:16 PM
More about Avi Loeb embarrassing himself and, by proxy, the astronomical community.
Reposted by suteki
Avi Loeb really is the Dr. Oz of astronomy now. Impressive CV but full of pseudoscience so no one in the field likes him any more. 🔭
I've summarized the truth about Loeb's 10 "anomalies" about 3I/ATLAS in one post.
Thanks to @deschscoveries.bsky.social @michael-w-busch.bsky.social @cometary.org and @marshall-eubanks.bsky.social for contributing their expertise!
Thanks to @deschscoveries.bsky.social @michael-w-busch.bsky.social @cometary.org and @marshall-eubanks.bsky.social for contributing their expertise!
Loeb’s 3I/ATLAS “Anomalies” Explained
Avi Loeb continues to claim that 3I/ATLAS has many anomalous behaviors that lead to the conclusion that it “might” be an alien spacecraft. He carefully hedges the probability that it is a spacecraft ...
sites.psu.edu
November 11, 2025 at 12:23 AM
Avi Loeb really is the Dr. Oz of astronomy now. Impressive CV but full of pseudoscience so no one in the field likes him any more. 🔭
Reposted by suteki
3I/ATLAS has only done comety things for 140 days. I predict it’ll look like a comet on day 141. For 140 days this grifter has manufactured doubt. He’ll do the same tomorrow. He’s never going to stop. He’s the Terminator, if the Terminator’s job was misconstruing ice and rocks in space to be aliens.
November 17, 2025 at 4:55 PM
3I/ATLAS has only done comety things for 140 days. I predict it’ll look like a comet on day 141. For 140 days this grifter has manufactured doubt. He’ll do the same tomorrow. He’s never going to stop. He’s the Terminator, if the Terminator’s job was misconstruing ice and rocks in space to be aliens.
Reposted by suteki
This image is the arrangement of the solar system at the time that picture was taken. 3I is moving to the right, so the dust tail (which lags behind the ion tail) will be displaced to the left. Juice imaging will have a rather different vantage point, allowing for 3-D mapping of the tail.
November 17, 2025 at 12:31 PM
This image is the arrangement of the solar system at the time that picture was taken. 3I is moving to the right, so the dust tail (which lags behind the ion tail) will be displaced to the left. Juice imaging will have a rather different vantage point, allowing for 3-D mapping of the tail.
Reposted by suteki
Ooh gross just discovered a bunch of youtube channels blaring about 3I/ATLAS using an AI-generated Brian Cox. The channel description says the videos are all AI, but the videos are clearly designed to make people think BC is actually saying these things..
November 17, 2025 at 4:05 AM
Ooh gross just discovered a bunch of youtube channels blaring about 3I/ATLAS using an AI-generated Brian Cox. The channel description says the videos are all AI, but the videos are clearly designed to make people think BC is actually saying these things..