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Michele Bannister 11. ruj
Orbits and when to get excited: a thread
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Michele Bannister 11. ruj
Odgovor korisniku/ci @astrokiwi
There's a lot of excitement in the last day or so about a candidate near-Earth asteroid that has the temporary designation . This object is currently listed on the Possible Comet Confirmation Page
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Michele Bannister 11. ruj
Odgovor korisniku/ci @MinorPlanetCtr
Entirely routinely and going on all the time, new moving things in the sky get found and added to the Near-Earth Object Confirmation Page of
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Michele Bannister 11. ruj
Odgovor korisniku/ci @astrokiwi
If they turn out to be a little fuzzy dot, with a cometary coma, they are moved from that list to the Possible Comet Confirmation Page [I'm simplifying a little, but broad-brush]. This step requires More Observations
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Michele Bannister 11. ruj
Odgovor korisniku/ci @MinorPlanetCtr
When the orbit is sufficiently well known, issues a Minor Planet Electronic Circular. This step requires a fair bit of knowledge about the object's orbit. Which comes from observations
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Michele Bannister 11. ruj
Odgovor korisniku/ci @MinorPlanetCtr
Until the arc of an orbit is sufficiently long, there are really strong uncertainties in what its orbit can be. The ways this gets resolved? More observations
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Michele Bannister 11. ruj
Odgovor korisniku/ci @astrokiwi
This is not the first object since 2017/1I, better known as ʻOumuamua, to show a hyperbolic orbit. Several short-arcs have flourished and slid slowly into the demise of straightforward parabolas. What it took? More observations
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Michele Bannister 11. ruj
Odgovor korisniku/ci @astrokiwi
Orbits are determined by mathematical fits to the astrometry that's sent to the MPC by observers all around the world. At the moment, there are some weird residuals in the fit to the orbit of this candidate object. You know what will resolve that? More observations
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Michele Bannister 11. ruj
Odgovor korisniku/ci @MinorPlanetCtr
I too will be delighted to see a second observable interstellar object. And I'm absolutely sure are watching the incoming astrometry. For now? No MPEC yet. Sometimes, we just have to wait for the motion of the heavens. And make...more observations. /fin
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Naïve Bayesian 11. ruj
Odgovor korisniku/ci @astrokiwi @MinorPlanetCtr
Thank you for keeping us updated.
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Daniel Fischer 11. ruj
Odgovor korisniku/ci @astrokiwi @MinorPlanetCtr
What is that screenshot of exactly? The - linked - online circular doesn't have any of the text.
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Wesley Fraser 11. ruj
Odgovor korisniku/ci @astrokiwi @MinorPlanetCtr
Here we go again
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Wesley Fraser 12. ruj
Odgovor korisniku/ci @astrokiwi @MinorPlanetCtr
Ou'twoamua
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★ govertschilling 11. ruj
Odgovor korisniku/ci @astrokiwi @MinorPlanetCtr
why don't they use the letter I again (for interstellar)?
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John Carney 11. ruj
Because that’s far from confirmed
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Larry R. Nittler  🚀🎹🌖☄️ 11. ruj
Odgovor korisniku/ci @astrokiwi @MinorPlanetCtr
So what are the elements? ( not shown on mpec screenshot)
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Amanda Stadermann 11. ruj
At the bottom of that page. Notably: e 3.0794827
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Meithan West 12. ruj
Odgovor korisniku/ci @astrokiwi @MinorPlanetCtr
Is the uncertainty on the eccentricity good enough to say this is (very?) probably interstellar at this point?
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Thread Reader App 12. ruj
Odgovor korisniku/ci @Big_Frank_612 @astrokiwi
Hi! please find the unroll here: Thread by : "Orbits and when to get excited: a thread There's a lot of excitement in the last day or so about a candidate near-Earth […]" Enjoy :) 🤖
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