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KAGUYA lunar explorer (aka SELENE)
djellison
post Oct 9 2007, 09:30 AM
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All credit to JAXA - you guys know how to make this cool...

cover it in cameras smile.gif

Doug
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rlorenz
post Oct 9 2007, 11:43 AM
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QUOTE (jabe @ Oct 6 2007, 10:10 PM) *
Efficiency issues using fuel resources sometimes has multiple perigee burns to increase the apogee to the required size..which is why I believe the probe did several orbits around the Earth. (I may be wrongabout why multiple burns though wink.gif )


A couple of factors play in. One, ideally the delta-V should be impulsive (i.e. instantaneous, with infinite thrust)
But that means infinite structural loads, and a big engine. With a real engine, the thrusting must be conducted
over a finite time, i.e. a finite orbital arc. If the vehicle is spin-stabilized, and the arc is long, then the
engine suffers a cosine loss in useful thrust at the ends of the arc, and so it can be more efficient to split the
burn up into smaller ones (each with lower losses). There can also be issues of orbit determination or safety
(e.g. that should a burn fail part way through, you arent left in some catastrophic orbit - sometimes splitting
it up can avoid danger zones) but that is less likely here.
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nop
post Oct 9 2007, 01:17 PM
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FYI, I hope this mapping image will help you figure out where Kaguya is smile.gif
Mapping by Prof. Naru Hirata (Aizu Univ.) and article by Shin-ya Matsuura.
http://smatsu.air-nifty.com/lbyd/2007/10/post_38e8.html (Click the image to enlarge)
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ugordan
post Oct 9 2007, 01:29 PM
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QUOTE (nop @ Oct 9 2007, 03:17 PM) *
FYI, I hope this mapping image will help you figure out where Kaguya is smile.gif
Mapping by Prof. Naru Hirata (Aizu Univ.) and article by Shin-ya Matsuura.

I see he's using NASA World Wind there laugh.gif


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kenny
post Oct 9 2007, 06:58 PM
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Many congratulations to JAXA after the disappointments about Nozomi et al. This mission is shaping up really nicely and there is a lot to look forward to. Those images of the moon with parts of the spacecrfat in the foreground remind me of Rosetta's fly-by of Mars.... as if we the viewers are looking out from a spacercraft which we are on-board.
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SpaceListener
post Oct 10 2007, 04:02 PM
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KAGUYA (SELENE) Lunar Orbit Adjustment Maneuver (LOI4)

QUOTE
The Japan Aerospace Exploration Agency (JAXA) plans to carry out a lunar orbit adjustment maneuver
(LOI4) for the “KAGUYA” (SELENE) from around 9:24 a.m. on October 10, 2007 (Japan Standard
Time, JST.)


During the 4th LOI, Kaguya will lower from 2400 km apogee altitude to 800 km apogee altitude. The next step will free another small satelite of 50 kg: VRAD on October 12. Later, there will be two more LOI adjustments before entering the Lunar orbit at Oct 19.
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Phil Stooke
post Oct 12 2007, 01:21 AM
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VRAD (Vstar) separation coming up...


http://www.jaxa.jp/countdown/f13/topics/pd...830_vstar_e.pdf



Phil


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... because the Solar System ain't gonna map itself.

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kenny
post Oct 12 2007, 12:40 PM
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.... and the VRAD satellite has departed, now-named "OUNA" meaning an "honorable elderly woman." How nice. A couple of photos show it sliding away into the black...

VRAD separation

Kenny
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Phil Stooke
post Oct 19 2007, 02:33 AM
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Getting there...

http://www.jaxa.jp/countdown/f13/topics/pd...925_loi56_e.pdf

Now for the images...

Phil


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Phil Stooke
post Oct 21 2007, 02:56 AM
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Here's the latest - images from the monitoring camera in low orbit.


Phil

http://www.jaxa.jp/press/2007/10/20071021_kaguya.pdf

Attached Image


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... because the Solar System ain't gonna map itself.

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nop
post Oct 21 2007, 05:20 AM
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You can see more images captured by the monitoring camera at:
http://www.jaxa.jp/press/2007/10/20071021_kaguya.pdf

Sorry, it's written mainly in Japanese... sad.gif
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nop
post Oct 21 2007, 06:14 AM
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QUOTE (nop @ Oct 21 2007, 02:20 PM) *
You can see more images captured by the monitoring camera at:
http://www.jaxa.jp/press/2007/10/20071021_kaguya.pdf


FYI, bigger images are here;
http://www.jaxa.jp/press/2007/10/img/20071021_kaguya_01.jpg
http://www.jaxa.jp/press/2007/10/img/20071021_kaguya_02.jpg
http://www.jaxa.jp/press/2007/10/img/20071021_kaguya_03.jpg
http://www.jaxa.jp/press/2007/10/img/20071021_kaguya_04.jpg
http://www.jaxa.jp/press/2007/10/img/20071021_kaguya_05.jpg
http://www.jaxa.jp/press/2007/10/img/20071021_kaguya_06.jpg
http://www.jaxa.jp/press/2007/10/img/20071021_kaguya_07.jpg
http://www.jaxa.jp/press/2007/10/img/20071021_kaguya_08.jpg
http://www.jaxa.jp/press/2007/10/img/20071021_kaguya_09.jpg
http://www.jaxa.jp/press/2007/10/img/20071021_kaguya_10.jpg
http://www.jaxa.jp/press/2007/10/img/20071021_kaguya_11.jpg
http://www.jaxa.jp/press/2007/10/img/20071021_kaguya_12.jpg
http://www.jaxa.jp/press/2007/10/img/20071021_kaguya_13.jpg
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Stu
post Oct 21 2007, 07:39 AM
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Thanks for the links to those pics nop.

Is anyone else sitting there grinning, thinking "Those are just cool!!" ? smile.gif


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mchan
post Oct 21 2007, 07:47 AM
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They are indeed cool.

In http://www.jaxa.jp/press/2007/10/img/20071021_kaguya_02.jpg, that would not be Earth in the background instead of part of the spacecraft, would it?
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Stu
post Oct 21 2007, 08:09 AM
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I spotted that too... very nice...!

Only problem with these images is that Moon-watchers like me are going to spend hours trying to identify craters on them... !!!

I'm looking out for the crater "Eddington" so I can plug both the probe's mission and my astro society in the local press! Very useful for publicity and recruitment! wink.gif


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