# Extraterrestrial Object Orbits

• B
• happyhacker
In summary, an extraterrestrial object like Oumuamua but say volume 750 E+9 (=750,000,000,000 I think but not sure of density although not solid rock) that takes orbit near Space to Earth does not disturb the balance of local orbits or operation of satellites. It would require energy to maintain it's orbit, but would not require energy to enter orbit.

#### happyhacker

TL;DR Summary
Extraterrestrial object takes up orbit.
I am thinking about an extraterrestrial object like Oumuamua but say volume 750 E+9 (=750,000,000,000 I think but not sure of density although not solid rock) that takes orbit near Space to Earth.

1. Would the magnetic field of this object disturb the balance of local orbits or operation of Satellites?
2. Would it require it's own energy to maintain such an orbit?

Probably left out some factors here so maybe need advice.

Thank You.

happyhacker said:
I am thinking about an extraterrestrial object like Oumuamua but say volume 750 E+9 (=750,000,000,000 I think but not sure of density although not solid rock) that takes orbit near Space to Earth.
You need to specify units. 750 billion what? Liters? Cubic meters? Cubic furlongs?
happyhacker said:
1. Would the magnetic field of this object disturb the balance of local orbits or operation of Satellites?
What makes you think Oumuamua has a magnetic field?

Its gravity might be a problem but it depends where it is.
happyhacker said:
2. Would it require it's own energy to maintain such an orbit?
It would require energy to enter orbit because it was going way too fast for Earth orbit. But it would not require energy to maintain it once it was in, any more than the moon needs a rocket. Unless it was so low it was in the atmosphere.

What's the point of these questions? They're so general it's hard to give meaningful answers.

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BvU
Apologies, when I wrote 'like Oumuamua' I did not mean Oumuamua just referring to it's general shape. I should also have put metres for the volume. My object is in place so it's approach is not a factor. So if that does not clarify I will withdraw the question. Thanks for the input so far.

https://www.cnn.com/2016/06/16/us/nasa-asteroid-circles-earth

is an article about a medium sized object ~90m in the largest direction. It is still out there in a stable orbit. It does not affect satellites. It is not magnetic and cannot be made to generate one.

Magnetic fields like the Earth has are the result of activity in the core, the asteroid you posit is too small:
https://web.ua.es/docivis/magnet/Earth's_magnetic_field2.html

1. no
2. no

### Extraterrestrial: The First Sign of Intelligent Life Beyond Earth by Avi Loeb​

BvU and russ_watters
happyhacker said:
Summary:: Extraterrestrial object takes up orbit.

that takes orbit near Space to Earth.
Without an engine of some sort, the object would need to interact with at least one other object in the Solar System in order to lose the vast amount of solar orbital Energy. We are familiar enough with slingshot orbits giving us 'free' energy for distant space missions. The same concept applies in reverse to bring orbits closer than the Sun. (See the Parker Mission, using Venus, to bring its orbit nearer to the Sun)
The actual numbers count here and I believe that a very high mass object (Jupiter?) would be essential for a random guest object to end up in a low eccentricity Solar orbit. It's no wonder such objects are rare.

BvU
Many thanks. Read the references. Clear now.

BvU