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KAGUYA lunar explorer (aka SELENE)
punkboi
post Oct 4 2007, 05:34 AM
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QUOTE (Norm Hartnett @ Oct 3 2007, 07:51 PM) *
Typical western nonsense! As can clearly be seen in these JAXA photos the Earth has a disk shaped body and the pristine waterfalls are falling away from the spacecraft and not visible since the craft is going to the moon. biggrin.gif


How could I have been so blind???

So we won't know how the LOI went till 9:00 AM, JST on October 5...which would be 5:00 PM, PDT tomorrow.

http://www.jaxa.jp/press/2007/10/20071004_kaguya_e.html


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Phil Stooke
post Oct 4 2007, 01:07 PM
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"At 5:55 a.m. on Thursday, a small engine was fired to change the probe's direction and speed and send it into an elliptical orbit around the moon's north and south poles. JAXA officials said the firing of the engine went well."

http://mdn.mainichi.jp/national/news/20071...0na036000c.html

Phil


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SpaceListener
post Oct 4 2007, 01:17 PM
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At the beginning, JAXA says that Kaguya is mainly as an experimental spacecraft to prove new technologies.. Thus, I presume that this is one of the low-profile public relations' reasons since this kind of mission has high risk of success. Hope, that all new technologies would run fine after many past setback lessons. wink.gif
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jabe
post Oct 4 2007, 06:36 PM
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looks like they were successful..see spaceflightnow.com article

edit:lets hope jaxa has an official update soon!!
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Norm Hartnett
post Oct 4 2007, 08:40 PM
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QUOTE (SpaceListener @ Oct 4 2007, 06:17 AM) *
At the beginning, JAXA says that Kaguya is mainly as an experimental spacecraft to prove new technologies.. Thus, I presume that this is one of the low-profile public relations' reasons since this kind of mission has high risk of success. Hope, that all new technologies would run fine after many past setback lessons. wink.gif


I am not sure that Kaguya can be characterized as an "experimental spacecraft to prove new technologies", except as all spacecraft are experimental. At 2 tons and half a billion dollars, carrying 15 cutting edge planetary exploration instruments, this craft is the equal of any flown to any planet. JAXA has stated that it is "the most sophisticated lunar exploration mission in the post-Apollo Era." and "the largest lunar mission since the Apollo program". This mission could be the crown jewel of Japan's planetary exploration efforts for some time to come.
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SpaceListener
post Oct 5 2007, 01:42 AM
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QUOTE (Norm Hartnett @ Oct 4 2007, 03:40 PM) *
I am not sure that Kaguya can be characterized as an "experimental spacecraft to prove new technologies", except as all spacecraft are experimental.


What I was saying comes from the extract: Kaguya's mission profile
QUOTE
The key technologies, such as the lunar orbit insertion and attitude / orbit control of the Orbiter are verified for future lunar exploration.

More details about Kaguya:
Kaguya (Selene) Home Web
Institute of Space and Astronautical Science (Kaguya)

I agree that the Kaguya is an impressive 3 ton spacecraft along with 15 scientific instruments.
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jabe
post Oct 5 2007, 11:19 AM
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press release is up.
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nop
post Oct 5 2007, 05:46 PM
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I am pleased to share the success of LOI with you all smile.gif

QUOTE (SpaceListener @ Oct 4 2007, 10:17 PM) *
At the beginning, JAXA says that Kaguya is mainly as an experimental spacecraft to prove new technologies..


Kaguya is a scientific mission rather than technological one, but of course it includes lots of experimental elements for new technologies.

FYI, Japan once had an experimental lunar probe, Hiten (MUSES-A), launched in 1990 to prove new technologies. The mission included LOI, successive swing-by navigation, aero-breaking by earth atmosphere, daughter satellite deployment, orbit determination using optical navigation, observation of space dusts around Lagrange points, and so on. I think Kaguya's LOI was supported by techniques acquired in Hiten mission.
http://en.wikipedia.org/wiki/Hiten
http://www.isas.ac.jp/j/isasnews/backnumbe...ISASnews154.pdf (mainly in Japanese, but including English articles and many figures)

We've had two unfortunate experiences in deploying of daughter satellites, Hagoromo from Hiten and MINERVA from Hayabusa sad.gif But I hope we'll get "the third time lucky" in upcoming deployment of VRAD and relay satellites smile.gif
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Norm Hartnett
post Oct 5 2007, 07:22 PM
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QUOTE (nop @ Oct 5 2007, 10:46 AM) *
I am pleased to share the success of LOI with you all smile.gif


Hoorah! biggrin.gif

Now you're rolling! wheel.gif
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Guest_Zvezdichko_*
post Oct 6 2007, 03:58 PM
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Guests






I wonder when the first images will be published smile.gif
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SpaceListener
post Oct 7 2007, 01:32 AM
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A new update from Kaguya. It has already performed the 3rd LOI.
The First LOI:
Injected orbit
Apogee altitude 11,741 km
Perigee altitude 101 km
Period 16 hours 42 minutes

The second LOI:
Apogee altitude 5,694 km
Perigee altitude 108 km
Period 7 hours 53 minutes

The third LOI: has already conducted. There are still three more.

More details KAGUYA (SELENE) Lunar Orbit Adjustment Maneuver (LOIx)

Just a curiosity, how does the spacecraft able to lower the Apogee?
Trying to understand it, it is done by firing the rocket when the spacecraft is reaching the apogee so that the next loop will go slower and thus reducing its next apogee altitude and continues until reaching the desired altitude?
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jabe
post Oct 7 2007, 02:10 AM
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QUOTE (SpaceListener @ Oct 7 2007, 01:32 AM) *
Just a curiosity, how does the spacecraft able to lower the Apogee?
Trying to understand it, it is done by firing the rocket when the spacecraft is reaching the apogee so that the next loop will go slower and thus reducing its next apogee altitude and continues until reaching the desired altitude?

Simple Really,
The simplest way to raise or lower the perigee or apogee is to do a rocket firing at opposite position you want to change.
ie. to lower apogee you decrease speed at perigee. or to raise apogee you increase speed when at perigee. etc...
so the burn doesn't change the current position..it affects the opposite side of the orbit.
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 )
cheers
jb
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Phil Stooke
post Oct 9 2007, 02:07 AM
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The Relay satellite "Rstar" will be released tomorrow.

Phil


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nop
post Oct 9 2007, 08:34 AM
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Rstar was successfully separated.
http://www.jaxa.jp/press/2007/10/20071009_kaguya_e.html

QUOTE (Zvezdichko @ Oct 7 2007, 12:58 AM) *
I wonder when the first images will be published smile.gif


I think data will be released after checkout of equipment. See translation of the press conference in LOI.
http://jspace.misshie.jp/index.php?LbyD%2F20071005
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SkyeLab
post Oct 9 2007, 09:04 AM
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Nice update and a couple of spacecraft moonshots:

http://www.jaxa.jp/press/2007/10/20071009_kaguya_e.html#at01

http://www.jaxa.jp/press/2007/10/img/20071009_kaguya_05l.jpg

http://www.jaxa.jp/press/2007/10/img/20071009_kaguya_07l.jpg


Enjoy........

Brian


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