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Asteroids (Read 146717 times)
atomic7732
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Re: Asteroids
Reply #180 - 01/04/09 at 12:24:06
 
WHere can I get the Horizons Automator. It looks cool!
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Tony
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Re: Asteroids
Reply #181 - 01/04/09 at 14:40:06
 
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atomic7732
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Re: Asteroids
Reply #182 - 01/04/09 at 18:03:25
 
Okay.
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frankuitaalst
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Re: Asteroids : first big one of 2009 discovered
Reply #183 - 01/10/09 at 06:58:06
 
Quote from frankuitaalst on 01/04/09 at 03:31:48:
Maybe an early gift of 2009 :
On 02/01/2009 this really big asteroid was discovered . It ranks highest in Palermo scale among the newly discovered ones with an estimated diameter of about 900 meters .
http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2009+AV;orb=1.
The orbital parameters still show a lot of sigma ( sma = 0.88 +/- 0.14sigma) after only 10 observations .
Remarkable is the fact that 2009AV must have been closer to earth in the past years , so it's a mystery to me why this one hasn't been discovered earlier ...
The animation herunder shows the most likely orbit in rotating frame to Earth . Animation starts at 01/02/2007.
The green dot in the last picture shows the approximate location of 2009AV at the time of discovery .
As more observations will become available I'll try to update if necessary .

New observations of the asteroid solve the mystery why it wasn't detected earlier : the initial orbit has changed dramatically in this sense the asteroid actually moves slower than Earth and is approaching ...
The danger for a collission seems to be gone with a MOID of 0.02AU .  
Herunder is an animation of the path of the asteroid in rotating frame to Earth . The fisrt part is a top view , the second part shows a side view. The "old" orbit is in grey , the newly calculated orbit is shown in white ...
 
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atomic7732
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Re: Asteroids
Reply #184 - 01/10/09 at 09:04:04
 
I was looking through asteroids on there and I found that. COOL! I didn't know it was that big.
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frankuitaalst
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2000SG344 : a nerveous asteroid
Reply #185 - 01/17/09 at 05:49:45
 
2000SG344 is a small asteroid measuring only 40 meter s in diameter .  
Currently it is one of the asteroids having the biggest chance for collision with Earth . It ranks lower than Apophis due to its lower mass .  
The asteroid will make numereous close encounters with Earth in the future ( as it did in the past also) .  
Each close encounter changes it's orbit , sometimes in a dramatic way .  
Herunder is an animation of its orbit over the next 500 years in time frames of 10 years ...
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2000sg344.gif
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atomic7732
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Re: Asteroids
Reply #186 - 01/17/09 at 09:53:33
 
Why did yo change the objects colors
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frankuitaalst
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Re: Asteroids
Reply #187 - 01/17/09 at 10:03:51
 
I didn't change anything . What you see is Earth in blue and moon in silver .
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atomic7732
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Re: Asteroids
Reply #188 - 01/17/09 at 11:53:56
 
Mercury in yellow-green and venus in blue. Mine is mercury in gray and venus in... I forgot.
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frankuitaalst
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Asteroid : update of Neo from JPL
Reply #189 - 01/22/09 at 12:58:26
 
JPL announces to have updated the known risks for asteroids .  
http://neo.jpl.nasa.gov/risk/
Haven't yet read the paper but its remarkable that two "old" known preditors 2001WN5 and 1999RQ36 have been promoted ito the top in the risk ranking .  
These two guys are really big ....
As far as I can see now the risks rise because the new system evaluates the risk over more than 100 years , where the previous system cut at 100 years .  
Maybe even other asteroids will be promoted the next days.
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frankuitaalst
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Asteroids : 2009BD : temporary moon
Reply #190 - 01/26/09 at 10:39:12
 
THe Baut Forum ( Universe Today ) announced today the detection of a stalking moon to Earth : 2009BD  
The body is only 10 m across and will come as cloes as 1.8 LD . Moreover it is claimed it will stay as another moon for some time .  
I simulated this one a couple of days ago . One may see in this rotating frame the asteroid will make some revolutions around Earth , but will leave soon . ( in this sim at 02/05/2011 after a close encounter of 0.0023 AU ) .
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2009BDAnimRot.gif
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Tony
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Re: Asteroids
Reply #191 - 01/26/09 at 12:59:33
 
I made a reply on the BA's blog about this asteroid yesterday:
 
It seems this asteroid doesn't quite deserve all the attention its getting.  Despite what's been reported, It is not co-orbital with Earth.  Co-orbitals can't come this close to Earth.  Using JPL's numbers, here's some diagrams of 2009 BD's orbit.  
 
This image shows its trajectory during its 4-year stint in Earth's vicinity.  This image was made in a rotating frame, which would keep the sun still if the image were zoomed out enough to show the sun.

 
The next image shows the next 20 years of its orbit.  This is also in a rotating frame.  There's nothing in this trajectory that suggests that this asteroid is co-orbital with Earth.
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frankuitaalst
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Re: Asteroids
Reply #192 - 01/26/09 at 13:45:34
 
The asteroid escapes , isn't it  ? ( around may 2001 ? )
BTW : how do you manage to add time stamps ?
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Tony
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Re: Asteroids
Reply #193 - 01/26/09 at 14:24:07
 
It was never really captured, so I wouldn't use the word 'escape'.  But in 2011 it makes a very close pass to Earth, closer than the moon, which pumps up its sma, extending its period, making it less Earth-like, so rapidly departs Earth's vicinity.
 
The time stamps?  I just photoshop them in afterwards. Grin
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frankuitaalst
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Asteroids : 200BD from sun
Reply #194 - 01/27/09 at 11:05:14
 
In order to complete the "picture" of this odd stalking asteroid I made this animation :  
Viewpoint is the sun , looking at Earth .  
Moons orbit is shown in white .  
One can see the asteroid approaching from the left , make some revolutions and then "leaves" after a close approach around May 2011.  
Each frame covers 0.05 years . The animation starts 1 year ago .
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2009BDFromSun.gif
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