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Forum » SpaceEngine » Space Journeys » Challenge: Most Distant Moon
Challenge: Most Distant Moon
Tallest_SkilDate: Thursday, 24.07.2014, 20:49 | Message # 1
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Description: Try to find the moon that orbits the furthest from its planet. Pretty simple. Inspired by me finding this thing:

Ten AU. TEN AU. Orbits in 686 years. Now that’s a moon.

Added (24.07.2014, 19:49)
---------------------------------------------
Ugh, how do I edit posts? How do I attach images? How do I use any of the post buttons above this text field? Nothing seems to work, despite telling me it works fine.




 
anonymousgamerDate: Thursday, 24.07.2014, 20:52 | Message # 2
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There's a little edit button on the bottom right. You attach images with the [IMG] tag (if you upload the image to imgur or something) or $IMAGE1$ if you upload directly to the site.




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RockoRocksDate: Friday, 25.07.2014, 14:21 | Message # 3
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A moon with an orbit of 10 AU? Must be a glitch...




I will be inactive on this forum for the time being. Might come back eventually

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FastFourierTransformDate: Friday, 25.07.2014, 16:35 | Message # 4
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Well, Neptune has a moon called Neso, that has an orbit of one third AUs and a period of nearly 27 years.
The example here is a bit more extreme, but only 30 times the solar system's extreme case, Neso.

You know better than me probably, so correct me please, but a planet has a bigger sphere of influence (in the presence of the star) the more far it is from the star, so there can be moons very far from the planets when this planets are soo far from their parent stars (That's why Neptune has the extreme example in our system). The planet at those distances can capture an asteroid far far away, because the influence of the Sun is no longer so important to take away from the planet the moon.

There's a planet called GU Piscium b that orbits his star at a distance of 2000 AU (this is the farthest know planet from it's parent star within the 1811 explotanets that we humans have studied). I have calculated with a very low estimate for the planets mass (9 Jupiters) and a very high estimate of the stars mass (8 solar masses) that the radius of influence or Hill Sphere of that planet must be, in the pessimistic case, of 142 AUs.
That means a moon orbiting GU Piscium b at 10 AUs is well inside the sphere of influence of the planet and it is totally possible. Perhaps it has moons farther away, even 100 AUs maybe.

The problem now is to know where have Tallest_Skil find that moon, and if it obeys the hill radius of the planet that orbits.
Maybe you can tell us the name of the object so we can search it. If SE is incapable of predicting this kind of extremes then it must implement them because nature is awesome!!


Edited by FastFourierTransform - Friday, 25.07.2014, 16:37
 
SalvoDate: Saturday, 26.07.2014, 10:42 | Message # 5
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Quote FastFourierTransform ()
There's a planet called GU Piscium b that orbits his star at a distance of 2000 AU (this is the farthest know planet from it's parent star within the 1811 explotanets that we humans have studied). I have calculated with a very low estimate for the planets mass (9 Jupiters) and a very high estimate of the stars mass (8 solar masses) that the radius of influence or Hill Sphere of that planet must be, in the pessimistic case, of 142 AUs.
That means a moon orbiting GU Piscium b at 10 AUs is well inside the sphere of influence of the planet and it is totally possible. Perhaps it has moons farther away, even 100 AUs maybe.

It seems to make sense... very interesting!

I also found a moon orbiting 2 AU from its parent planet, but unfortunately I don't have the location anymore sad





The universe is not required to be in perfect harmony with human ambition.

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(still don't know why everyone is doing this...)
 
Tallest_SkilDate: Sunday, 27.07.2014, 06:14 | Message # 6
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Aha, so let’s see…

Added (27.07.2014, 05:14)
---------------------------------------------
There we go. Oh, so this forum just uses standard BBCode? Good to know.

Yes, anyway, this moon certainly isn’t alone around its planet, but it was the furthest one I could find. The planet itself is something like 600 AU from its parent(s) on a multi-thousand year orbit, so the moon’s orbital period seems short in comparison.

I wish SE would show orbital speed for all bodies. That’d be a nice addition.




 
FastFourierTransformDate: Sunday, 27.07.2014, 11:28 | Message # 7
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Oohhh god It's extremly far away!! and there's a supernova renmant near the system!!

By the way, I have found a most distant moon in the same planet hahahaha

RS 8409-1387-6-63019-42 1.93

The moon has a Semimayor axis of 10.206 AU. win?
 
B25MitchDate: Thursday, 31.07.2014, 17:52 | Message # 8
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Quote Tallest_Skil ()
I wish SE would show orbital speed for all bodies. That’d be a nice addition.


For that particular moon it's around 300m/s. It really puts into perspective how huge this orbit is - a Jumbo Jet (roughly the same speed) would take around 680 years to fly that distance non-stop.
 
UnnamedDate: Monday, 11.08.2014, 00:43 | Message # 9
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Seems like i got one with an 11 AU orbit with a 3033 year orbit.



The system is called 8 stars because it has 8 stars(duh)
The other moon just has a 0.001 AU difference(wow)
The planet it orbits takes 60,000 years to orbit o.o





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Edited by Unnamed - Monday, 11.08.2014, 00:45
 
Stargate38Date: Monday, 11.08.2014, 01:13 | Message # 10
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Adhafera 2.87 has a pretty long period (>600 yr). It hasn't made a full orbit since the 1300s. I wasn't expecting such a long period for a dwarf moon, especially around a procedural planet orbiting a catalog star.
 
UnnamedDate: Monday, 11.08.2014, 01:20 | Message # 11
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Did you forget to put pictures?




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Tallest_SkilDate: Tuesday, 12.08.2014, 04:48 | Message # 12
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Quote
The system is called 8 stars because it has 8 stars(duh)


What’s the real name of the system? Or did you create it by hand?

I also seem to have found what could be the least distant moon.

Look at this thing: tidal forces are pulling it into an ovoid. But there’s an even closer one (tiny; no neat effect) on the next planet inward! This is with a FOV of 45º; THAT’S how close it is to its parent comparatively!









Edited by Tallest_Skil - Tuesday, 12.08.2014, 04:49
 
RockoRocksDate: Tuesday, 12.08.2014, 15:43 | Message # 13
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Quote Tallest_Skil ()
I also seem to have found what could be the least distant moon.

Actually, this is not the least distant moon. This planet, found by Voekoevaka, has a moon with a semi-major axis of only 1566.836 km. This may be one of the least distant moons ever. I doubt anyone will ever find one closer to its parent.





I will be inactive on this forum for the time being. Might come back eventually

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UnnamedDate: Tuesday, 12.08.2014, 15:51 | Message # 14
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I found the system a while ago with the star browser
I'll get the "real" name soon





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