Collision Avoidance Challenge

#1

Post by ipernet » Sat, Oct 19, 2019, 11:09 AM UTC

Collision Avoidance Challenge
kelvins.esa.int

Re: Collision Avoidance Challenge

#2

Post by z3phyr » Sat, Oct 19, 2019, 12:59 PM UTC

Are there any more past or present challenges like these?

Re: Collision Avoidance Challenge

#3

Post by alexeldeib » Sat, Oct 19, 2019, 1:17 PM UTC

z3phyr wrote: post #2

Are there any more past or present challenges like these?

Timeline at the top of the page seems to indicate this opened a few days ago and runs through December 2019?

Re: Collision Avoidance Challenge

#4

Post by softblush » Sat, Oct 19, 2019, 1:31 PM UTC

z3phyr wrote: post #2

Are there any more past or present challenges like these?

Clicking on "Competitions" in the site header reveals the past competitions?

Re: Collision Avoidance Challenge

#5

Post by spacekloir » Sat, Oct 19, 2019, 2:00 PM UTC

There is an interesting column in the data:

F10: 10.7 cm radio flux index [10−22 W/(m2 Hz)]

It seems to be some sun radio activity index, but why is it relevant to collisions?

Re: Collision Avoidance Challenge

#6

Post by fact_factory » Sat, Oct 19, 2019, 2:36 PM UTC

spacekloir wrote: post #5

There is an interesting column in the data: F10: 10.7 cm radio flux index [10−22 W/(m2 Hz)] It seems to be some sun radio activity index, but why is it relevant to collisions?

The sun heats the object and causes it to emit vapor, it emits more vapor on the side facing the sun, these emissions have a measurable affect on the orbit.

See the section on 2l/Borisov

https://en.wikipedia.org/wiki/Comet#Long_period

Re: Collision Avoidance Challenge

#7

Post by deddy » Sat, Oct 19, 2019, 3:12 PM UTC

spacekloir wrote: post #5

There is an interesting column in the data: F10: 10.7 cm radio flux index [10−22 W/(m2 Hz)] It seems to be some sun radio activity index, but why is it relevant to collisions?

F10.7 is the measured solar power flux at 10.7 cm wavelength. It is measured all over the world but primarily from Penticton observatory in Canada.

The largest source of uncertainty in orbit propagation for satellites in Low-Earth Orbit (LEO) is atmospheric drag. Solar activity directly effects the density of the atmosphere. It is an input to many atmospheric models which are used when propagating orbits. Which is central to all conjunction assessments (predicting where objects will be in case they might come too close).