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UmbralRaptor t1_j5gm1e8 wrote

There's two things going on here:

  1. escape velocity is related to distance. eg: Solar escape is ~42 km/s at Earth's distance, but some 600 km/s if you start at the photosphere. see eg: https://en.wikipedia.org/wiki/Voyager_2#/media/File:Voyager_2_velocity_vs_distance_from_sun.svg for how it falls off.

  2. The 26 km/s is a hyperbolic excess velocity. Not so much its current speed (though this is quite close), as how fast it would be going in an idealized case where it can get arbitrarily far from the Sun and we can ignore the rest of the galaxy, etc.

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Doumtabarnack OP t1_j5gmpip wrote

Do we know if its turn around the sun increased its current velocity relative to us or decreased it?

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the_fungible_man t1_j5gq7e4 wrote

Its encounter with the Sun changed the direction of it's motion, but not its speed. It's path was bent 66° by its trip through the Sun's gravity well, but for all practical purposes – treating the Sun and Oumuamua as a simplified two body system – Oumuamua left the solar system at the same speed it entered it.

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Anonymous-USA t1_j5goyh2 wrote

Yup… it’s all relative (in this case the motion vector and current distance)

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space-ModTeam t1_j5gpcue wrote

Hello u/Doumtabarnack, your submission "Oumuamua" has been removed from r/space because:

  • Such questions should be asked in the "All space questions" thread stickied at the top of the sub.

Please read the rules in the sidebar and check r/space for duplicate submissions before posting. If you have any questions about this removal please message the r/space moderators. Thank you.

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