Go Back   IceInSpace > General Astronomy > Observational and Visual Astronomy

Reply
 
Thread Tools Rate Thread
  #61  
Old 11-06-2009, 12:56 PM
AstroJunk's Avatar
AstroJunk (Jonathan)
Shadow Chaser

AstroJunk is offline
 
Join Date: Jan 2006
Location: Moonee Beach
Posts: 1,909
Quote:
Originally Posted by gmbfilter View Post
Thanks Geoff, but I'm hoping that somebody will know the exact (to the second) crash time. I assume that JAXA will know when communcations were lost - it's a shame they only posted a rough time.

EDIT: 18:25:07 +/- a couple of seconds - Steven Lee from the AAO just emailed me.

Last edited by AstroJunk; 11-06-2009 at 01:25 PM.
Reply With Quote
  #62  
Old 11-06-2009, 01:59 PM
TrevorW
Registered User

TrevorW is offline
 
Join Date: Aug 2006
Location: Western Australia
Posts: 7,852
Reuters: Flash: The impact of a Japanese satellite on the moon was met by a avalanche of amatuer astronomers with dissapointment. The expected sky show did not eventuate as unbeknown too these intrepid souls Japanese engineers had incorporated 23 airbags into their design which deployed succcessfully upon impact.

The Japanese did not advertise this in case tests failed but are now considering incorporating this innovation for high speed impacts in their next Toyota/Nissan and Mitsubishi releases for 2010.

Last edited by TrevorW; 11-06-2009 at 03:02 PM.
Reply With Quote
  #63  
Old 11-06-2009, 02:50 PM
DaveGee's Avatar
DaveGee (Dave Gault)
Occultation Observer

DaveGee is offline
 
Join Date: Aug 2006
Location: Blue Mountains, Australia
Posts: 232
Quote:
Originally Posted by AstroJunk View Post
I noted the re-appearence of an 11.5 mag star a few mins ago
Oh good! So I'll expect a lunar occultation report from you then!
Reply With Quote
  #64  
Old 11-06-2009, 02:55 PM
AstroJunk's Avatar
AstroJunk (Jonathan)
Shadow Chaser

AstroJunk is offline
 
Join Date: Jan 2006
Location: Moonee Beach
Posts: 1,909
Quote:
Originally Posted by DaveGee View Post
Oh good! So I'll expect a lunar occultation report from you then!
I still feel guilty about failing thus far to report those doubles from last year

It will happen
Reply With Quote
  #65  
Old 11-06-2009, 02:57 PM
DaveGee's Avatar
DaveGee (Dave Gault)
Occultation Observer

DaveGee is offline
 
Join Date: Aug 2006
Location: Blue Mountains, Australia
Posts: 232
Quote:
Originally Posted by TrevorW View Post
had incorporated 23 airbags into their design which deployed succcessfully upon impact.
Reply With Quote
  #66  
Old 11-06-2009, 03:07 PM
DaveGee's Avatar
DaveGee (Dave Gault)
Occultation Observer

DaveGee is offline
 
Join Date: Aug 2006
Location: Blue Mountains, Australia
Posts: 232
Quote:
Originally Posted by AstroJunk View Post
I still feel guilty about failing thus far to report those doubles from last year

It will happen
It's never too late Mate!

A well known American observer had observer 105 faint lunar occs between 1965 and 1970ish but couldn't ID the stars because the RGO only accepted observations of ZC and SAO stars. Now with the XZ80Q that's easy. In about March he dug out his observing log he got up to date in one go, only 39 years late!. So, I'm ready when you are!

Sorry for straying a little OT.
Reply With Quote
  #67  
Old 12-06-2009, 07:47 AM
Lester's Avatar
Lester
Registered User

Lester is offline
 
Join Date: Jan 2006
Location: E.P. S.A.
Posts: 4,963
Quote:
Originally Posted by AstroJunk View Post
That is pefectly framed for the target to be in the upper left corner
Thanks for that Jonathon. The phase of the Moon made it harder for me to find craters that I could identify in this area.
Reply With Quote
  #68  
Old 12-06-2009, 04:19 PM
kinetic's Avatar
kinetic (Steve)
ATMer and Saganist

kinetic is offline
 
Join Date: Jun 2008
Location: Adelaide S.A.
Posts: 2,280
Quote:
Originally Posted by AstroJunk View Post
Interesting. I have pefectly exposed footage of that area from two telescopes and have yet to find an event. More to the point, that's not where the impact was due to occur according to the charts!

EDIT: 18:25:07 +/- a couple of seconds - Steven Lee from the AAO just emailed me.
Jonathan,

Looks like, from the text below the AAT result that they went for a
time exposure of 0.6s or 1 sec maybe.

Edit : from the AAT link: 1sec exposures at 0.6sec intervals,
Narrowband filter with camera sensitive in the IR.

Why didn't I leave off the IR filter stoopid!

I think that might be the key to it <slaps forehead>!
I decided to go Prime/Newt focus with a 1500 FL and DSI II chip.
Pretty wide field I know but I didn't want to be doing any last
minute frantic adjusments if something got bumped at the last
minute.
I also was at a 0.001sec shutter speed to keep the terminator
at a reasonable exposure. That might have been my mistake.
Because they went time exposure (maybe), they would get an
event recorded if it happened over the 1 sec exposure whereas
my software probably missed it while cycling from download frame
to take the next exposure( The DSI can't do fast frame rate like a
webcam can.....2 frame per second at best.
A learning experience
I've histo'd all my frames around the 18:25 mark and...nothing

Steve

Last edited by kinetic; 12-06-2009 at 08:14 PM.
Reply With Quote
  #69  
Old 12-06-2009, 04:38 PM
AstroJunk's Avatar
AstroJunk (Jonathan)
Shadow Chaser

AstroJunk is offline
 
Join Date: Jan 2006
Location: Moonee Beach
Posts: 1,909
I still have a theory about why we never captured the impact.

It involves a rocky knoll and a smoking camera ...
Attached Thumbnails
Click for full-size image (crashsite.JPG)
38.6 KB42 views
Reply With Quote
  #70  
Old 12-06-2009, 08:23 PM
kinetic's Avatar
kinetic (Steve)
ATMer and Saganist

kinetic is offline
 
Join Date: Jun 2008
Location: Adelaide S.A.
Posts: 2,280
Jonathan,

How can the AAT flash/impact be soooo far from Crater Gill
if the Kaguya site is still reporting an impact at Gill?

I also had another heart sinking thought....all along people
in this thread have been calculating an impact from the
reported 18:25 GMT....and adding 10h to this time for CST.

See here on Sat News about the impact...note the times
http://www.satnews.com/cgi-bin/story...umber=65247901

They are reporting UT 16:25 and GMT as 18:25????

If that's correct (isn't British summer time GMT+1h BTW)
could we have possibly miscalculated the time?
Very likely I'm missing something here!

Steve

Last edited by kinetic; 12-06-2009 at 08:51 PM.
Reply With Quote
  #71  
Old 12-06-2009, 09:30 PM
AstroJunk's Avatar
AstroJunk (Jonathan)
Shadow Chaser

AstroJunk is offline
 
Join Date: Jan 2006
Location: Moonee Beach
Posts: 1,909
At this rate, Phil Plait will have to write this one up!

GMT = UT and 18:30 = 04:30 here in Oz. Yes the UK are on BST (UT+1) but that isnt a factor.

The Satnews times are rubbish - that's the only thing you are missing
Reply With Quote
  #72  
Old 12-06-2009, 11:24 PM
Rob_K
Registered User

Rob_K is offline
 
Join Date: Oct 2006
Location: Bright, Vic, Australia
Posts: 2,158
Yep, time seems OK as impact was reported at 3:25am, local Japanese time (UT+9). With the AAO flash, the latitude looks about right, although the longitude is off from the prediction. I made the predicted impact point a little further south than what you show it AJ.

Cheers -
Reply With Quote
  #73  
Old 13-06-2009, 12:18 AM
AstroJunk's Avatar
AstroJunk (Jonathan)
Shadow Chaser

AstroJunk is offline
 
Join Date: Jan 2006
Location: Moonee Beach
Posts: 1,909
You could well be right Rob, I pinched the image from LPOD: http://lpod.wikispaces.com/June+9%2C+2009 and overlaid it with a bit of my own to prove a point. If the reported impact site has shifted then so be it.

I think it's going to be interesting to see the final results, the oblique angle of impact could mean that the crash site was somewhere else, but given the brightness of the IRIS2 flash (albeit at 1400nm), it is a surprise that no one saw it.

I've made my observations to both AAO and JAXA, so it's sit back and wait time ...
Reply With Quote
  #74  
Old 20-06-2009, 10:04 AM
DaveGee's Avatar
DaveGee (Dave Gault)
Occultation Observer

DaveGee is offline
 
Join Date: Aug 2006
Location: Blue Mountains, Australia
Posts: 232
RIP Kaguya

Here is the video taken by Kaguya/Selene itself, just before the big event...
http://www.youtube.com:80/watch?v=AxDNWXZpC3g

Also in HD.

Play it on the biggest screen you have available.
Reply With Quote
  #75  
Old 20-06-2009, 01:54 PM
Dennis
Dazzled by the Cosmos.

Dennis is offline
 
Join Date: May 2005
Location: Brisbane
Posts: 11,704
Quote:
Originally Posted by DaveGee View Post
Here is the video taken by Kaguya/Selene itself, just before the big event...
http://www.youtube.com:80/watch?v=AxDNWXZpC3g
Also in HD.
Play it on the biggest screen you have available.
Wow – thanks for the heads up and link Dave. So very different than the Ranger series of impactors!

Cheers

Dennis
Reply With Quote
  #76  
Old 03-07-2009, 12:36 PM
mickkk
Registered User

mickkk is offline
 
Join Date: Sep 2006
Location: melb
Posts: 71
Video of the impact

http://antwrp.gsfc.nasa.gov/apod/ap090629.html
Reply With Quote
  #77  
Old 03-07-2009, 01:02 PM
Liz's Avatar
Liz
Registered User

Liz is offline
 
Join Date: Aug 2007
Location: Beautiful SE Tassie
Posts: 4,734
Wow!! Looks almost ... unreal
Reply With Quote
Reply

Bookmarks

Thread Tools
Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +10. The time is now 07:00 AM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Advertisement
Testar
Advertisement
Bintel
Advertisement