Jump to content

Stargazers Lounge Uses Cookies

Like most websites, SGL uses cookies in order to deliver a secure, personalised service, to provide social media functions and to analyse our traffic. Continued use of SGL indicates your acceptance of our cookie policy.

stargazine_ep34_banner.thumb.jpg.28dd32d9305c7de9b6591e6bf6600b27.jpg

Owmuchonomy

Asteroid TC4 Earth capture

Recommended Posts

Based on the recent 'graze' of TC4 is there anybody that can answer if it would be possible for Earth to capture such an object.  I did do a course whereby we calculated this for Sun grazing comets but I have forgotten how to do it. Is it a matter of distance from Earth and the kinetic energy of the asteroid? Escape velocity? I would be very interested in seeing the working. How close would such an object need to graze us?

  • Like 1

Share this post


Link to post
Share on other sites

I was reading a report last night, it said its about the size of a house and the next 2 dates as to coming around again, the next date will pass Earth but the last date will not. Going to saying it be like the last one was it in 2013.

Share this post


Link to post
Share on other sites

Starting to pick at this over a coffee... found two graphics to start with:

image.png.7b789bec441e57cfae000ab839e3dd55.png

image.png.3a2b5fd54f86462a12bad10f42728fed.png

Source: http://www.telegraph.co.uk/news/0/asteroid-2012-tc4-pass-damn-close-earth-tomorrow-give-rare-chance/

Each time it has come round, the orbit changes due to the graze with earth, but it's still orbiting the sun, not us.

 

From the same article:

Quote

 4.5 miles a second... 27,000 miles 

 

From https://en.wikipedia.org/wiki/Escape_velocity:

Quote

On the surface of the Earth, the escape velocity is about 11.2 km/s ... at 9,000 km altitude in "space", it is slightly less than 7.1 km/s.

4.5 miles/second happens to be very close to 7.1 km/s, so if it had passed just under 9km, its velocity would have been < escape velocity at that height and we'd have nabbed it...? Don't know if that's right or how to do the maths, but interesting to be able to calculate the change in orbit due to such a graze.

 

 

Edited by furrysocks2
  • Like 1

Share this post


Link to post
Share on other sites

Most important calculation is....will it eventually hit us!! :shocked:

Edited by Star101
missed a letter....Freudian !!!

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Recently Browsing   0 members

    No registered users viewing this page.

×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.