Eric Mamajek
@ericmamajek.bsky.social
Guy interested in (exo)planets and stars, and everything in between. Statements and opinions posted here are my own.
They were too busy perfecting *this*
November 19, 2025 at 8:20 AM
They were too busy perfecting *this*
Silly question - how much bone, fossils, coral, etc would have survived the KT impact, been launched to speeds > Vesc and impacted the Moon and Mars, and survived more-or-less intact?
Imagining that unwilling plesioastronaut breaking through the von Karman line with dying thought … ‘it’s round?’
Imagining that unwilling plesioastronaut breaking through the von Karman line with dying thought … ‘it’s round?’
November 19, 2025 at 8:17 AM
Silly question - how much bone, fossils, coral, etc would have survived the KT impact, been launched to speeds > Vesc and impacted the Moon and Mars, and survived more-or-less intact?
Imagining that unwilling plesioastronaut breaking through the von Karman line with dying thought … ‘it’s round?’
Imagining that unwilling plesioastronaut breaking through the von Karman line with dying thought … ‘it’s round?’
Assigned to LOC, between the Limbo and Lust Circles of Hell. Not that bad, and with great view of Limbo.
In all seriousness, March in Tucson sounds like a great venue.
And better with some exoplanets thrown in!
In all seriousness, March in Tucson sounds like a great venue.
And better with some exoplanets thrown in!
November 18, 2025 at 9:54 PM
Assigned to LOC, between the Limbo and Lust Circles of Hell. Not that bad, and with great view of Limbo.
In all seriousness, March in Tucson sounds like a great venue.
And better with some exoplanets thrown in!
In all seriousness, March in Tucson sounds like a great venue.
And better with some exoplanets thrown in!
Nope, 3I/ATLAS behaving like a comet and continuing along its predicted trajectory (in this case, it is a gravitationally umbound orbit that will take it out of the solar system, never to return. It’s non-gravitational accelerations are minor, and similar to that observed for solar system comets.
November 17, 2025 at 3:28 AM
Nope, 3I/ATLAS behaving like a comet and continuing along its predicted trajectory (in this case, it is a gravitationally umbound orbit that will take it out of the solar system, never to return. It’s non-gravitational accelerations are minor, and similar to that observed for solar system comets.
It may sound better to the kids if we say “feeding the dataome” or “working on new eyes for the dataome”.
Actually, that sounds terrifying.
Actually, that sounds terrifying.
November 6, 2025 at 7:20 PM
It may sound better to the kids if we say “feeding the dataome” or “working on new eyes for the dataome”.
Actually, that sounds terrifying.
Actually, that sounds terrifying.
Batman?
Spiderman?
Or given the area… Bearman?
Spiderman?
Or given the area… Bearman?
November 5, 2025 at 9:39 AM
Batman?
Spiderman?
Or given the area… Bearman?
Spiderman?
Or given the area… Bearman?
so that non-grav acceleration for #3IATLAS is "micro-g" => "micro-gravity".
Comparing it to the gravity environment in Int'l Space Station - it would correspond to very weak, quasi-steady effects due to gravity gradients or rotation. Nowhere near significant "thrust"
ntrs.nasa.gov/api/citation...
Comparing it to the gravity environment in Int'l Space Station - it would correspond to very weak, quasi-steady effects due to gravity gradients or rotation. Nowhere near significant "thrust"
ntrs.nasa.gov/api/citation...
ntrs.nasa.gov
November 5, 2025 at 8:57 AM
so that non-grav acceleration for #3IATLAS is "micro-g" => "micro-gravity".
Comparing it to the gravity environment in Int'l Space Station - it would correspond to very weak, quasi-steady effects due to gravity gradients or rotation. Nowhere near significant "thrust"
ntrs.nasa.gov/api/citation...
Comparing it to the gravity environment in Int'l Space Station - it would correspond to very weak, quasi-steady effects due to gravity gradients or rotation. Nowhere near significant "thrust"
ntrs.nasa.gov/api/citation...
note that those accelerations are evaluated as if the comet was @ 1 au from Sun.... but it is now near its perihelion (about 1.38au from the Sun), so you multiple that A1 factor by 1/(distance from Sun)^2 = 1/1.38^2 ~= 0.53. So the radial non-grav acceleration *is even weaker* => (1.2+-0.3)e-6 "g"
November 5, 2025 at 8:38 AM
note that those accelerations are evaluated as if the comet was @ 1 au from Sun.... but it is now near its perihelion (about 1.38au from the Sun), so you multiple that A1 factor by 1/(distance from Sun)^2 = 1/1.38^2 ~= 0.53. So the radial non-grav acceleration *is even weaker* => (1.2+-0.3)e-6 "g"