Spotting 2005 YU55

  • #1
DaveC426913
Gold Member
19,193
2,676
Can anyone direct me to some instructions that will tell me how I might be able to spot it? I know it may be difficult and may require a scope of at least 6", but we'll see.

I keep hearing that it will be moving "very" fast. How fast? Fast enough to see movement against the background?
 

Answers and Replies

  • #2
davenn
Science Advisor
Gold Member
9,440
8,346
hey Dave
try this site it has the asteroid path on a starmap

http://cuyastro.org/

Im envious We don't even get a chance to see it in the sthrn hemisphere

Dave
 
  • #3
DaveC426913
Gold Member
19,193
2,676
try this site it has the asteroid path on a starmap
Awesome. Thanks.

Wow! Those ticks are marking off hours.
 
  • #4
davenn
Science Advisor
Gold Member
9,440
8,346
I dont know if you are in a dark site or can get to a dark site near home. ?
It would be interesting to get a camera on a tripod and do a really long exposure ...aperture wide open eg F2 - F5 the best you can do and exposures of up to 30 minutes.
You will get long star trails, but you mite, just mite see a faint path of the asteroid cutting across the trails. It would really be worth a try :)

cheers
Dave

PS ... 30mins was with good ol' film camera would be worth trying say 10 - 15 mins with a DSLR
 
  • #5
Drakkith
Staff Emeritus
Science Advisor
21,105
4,933
Hrmm. Maybe I can get a few shots of it in my scope. I'll have to take everything into work, or miss the closest approach.
 
  • #6
turbo
Gold Member
3,077
50
Good luck, Drakkith. Hope to see shots.
 
  • #7
turbo
Gold Member
3,077
50
BTW, Curt Renz's calculations show that the asteroid will span the apparent width of the Moon in about 3.5 minutes, at closest approach, so if you have a decent-sized 'scope, you'd have to be pretty fancy to capture that asteroid as a "spot" instead of a streak.
 
  • #8
Drakkith
Staff Emeritus
Science Advisor
21,105
4,933
BTW, Curt Renz's calculations show that the asteroid will span the apparent width of the Moon in about 3.5 minutes, at closest approach, so if you have a decent-sized 'scope, you'd have to be pretty fancy to capture that asteroid as a "spot" instead of a streak.
My plan is to point to the location ahead of time and just start taking exposures when it comes time. Trying to actually track it with the scope is useless unless I can manually do it. Which is unlikely.
 
  • #9
DaveC426913
Gold Member
19,193
2,676
My plan is to point to the location ahead of time and just start taking exposures when it comes time. Trying to actually track it with the scope is useless unless I can manually do it. Which is unlikely.
You think it's moving that fast?


Also, closest approach is 11:30 UT, isn't that, like, 5AM ET?
 
  • #10
Drakkith
Staff Emeritus
Science Advisor
21,105
4,933
You think it's moving that fast?


Also, closest approach is 11:30 UT, isn't that, like, 5AM ET?
Hrmm. I didn't realize it was UT. That makes it 1800, aka 6 PM my time.
 
  • #11
DaveC426913
Gold Member
19,193
2,676
Hrmm. I didn't realize it was UT. That makes it 1800, aka 6 PM my time.
Barely past dusk...

What part of the sky is it in at that time? If anywhere other than East, we might be out of luck anyway.
 
  • #12
DaveC426913
Gold Member
19,193
2,676
BTW, Curt Renz's calculations show that the asteroid will span the apparent width of the Moon in about 3.5 minutes, at closest approach, so if you have a decent-sized 'scope, you'd have to be pretty fancy to capture that asteroid as a "spot" instead of a streak.
Forget photos. I want video! I want to see an object noticeably moving across the starscape in real time. That would be awesome!
 
  • #13
Drakkith
Staff Emeritus
Science Advisor
21,105
4,933
Barely past dusk...

What part of the sky is it in at that time? If anywhere other than East, we might be out of luck anyway.
It will be in the East, passing right through Pegasus at the time. We have thunderstorms raining down on us now, so I wouldn't be able to see it today no matter what lol.
 
  • #14
56
0
Wait so if those ticks mark hours, that means I should be able to see it for quite a while, right?

I have an 8 inch Dobsonian and I live in Phoenix. I missed the closest pass but I assume it will still be visible at later hours. I won't be around my telescope until about 8 PM Arizona time (7 hours off UTC).
 
  • #15
56
0
Also, I have the 2010 version of Starry Night and apparently 2005 YU55 is not in the database.
 
  • #16
56
0
Nevermind I just had to run update.

Hooray, it will be visible well after I get home.
 
  • #17
Drakkith
Staff Emeritus
Science Advisor
21,105
4,933
Nevermind I just had to run update.

Hooray, it will be visible well after I get home.
Yeah I'm hoping it will clear up for me tonight so I can catch a view too.
 
  • #18
195
1
I just saw a NASA radar image of it, how come the bottom half of the astroid is in shadow like an optical image?
 
  • #19
56
0
I just saw a NASA radar image of it, how come the bottom half of the astroid is in shadow like an optical image?
Most likely due to the relative wavelengths they are observing. While all objects emit at least trace levels of radio-waves, it's hard to detect. Most radio-waves are reflected off an object. So if part of the asteroid is in a shadow,not directly in the path of the suns light, there can be a shadow in other sections of the light spectrum.
 
  • #20
DaveC426913
Gold Member
19,193
2,676
Most likely due to the relative wavelengths they are observing. While all objects emit at least trace levels of radio-waves, it's hard to detect. Most radio-waves are reflected off an object. So if part of the asteroid is in a shadow,not directly in the path of the suns light, there can be a shadow in other sections of the light spectrum.
Or more simply, since the asteroid doesn't emit any radiation on its own, all radiation - including radio - will be as reflected light from the sun.
 
  • #21
Drakkith
Staff Emeritus
Science Advisor
21,105
4,933
Or more simply, since the asteroid doesn't emit any radiation on its own, all radiation - including radio - will be as reflected light from the sun.
What do you mean? We use radar to track and map objects within the solar system. I assumed they did the same thing here.
 
  • #22
56
0
Or more simply, since the asteroid doesn't emit any radiation on its own, all radiation - including radio - will be as reflected light from the sun.
IIRC, all bodies emit radiant energy.
 
  • #23
DaveC426913
Gold Member
19,193
2,676
Right. Of course. I don't know what I was thinking. A body in full shadow still emits IR.
 
  • #25
56
0
Well that was a depressing half hour. Turns out it's hard to find an asteroid with a manual telescope.

I gave up after my opposing eye started twitching.
 

Related Threads on Spotting 2005 YU55

Replies
24
Views
8K
Replies
3
Views
2K
  • Last Post
Replies
6
Views
2K
  • Last Post
Replies
8
Views
2K
  • Last Post
Replies
14
Views
4K
  • Last Post
Replies
3
Views
3K
  • Last Post
Replies
2
Views
3K
  • Last Post
Replies
5
Views
2K
  • Last Post
Replies
1
Views
686
  • Last Post
Replies
1
Views
2K
Top