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Chandrayaan 1, India's First Lunar Probe
Bhas_From_India
post Oct 23 2008, 04:38 AM
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as per new Orbit Transfer Strategy (Chandrayaan-I) ...

Earth Bound Orbits
1. Elliptical orbit - Perigee: 255km,
Apogee: 22,860km
2. Highly Elliptical orbit - Perigee: 300km
Apogee: 160000km
3. Intermediate transfer orbit - Perigee: 300km
Apogee: 2,60,000km
4. Extremely high elliptical orbit: Perigee: 300km
Apogee: 3,87,000km
5. Extremely high elliptical orbit: Perigee: 2000km
Apogee: 3,84,000km

Moon Bound Orbits
1. Lunar orbit 1 - Perigee: 500km
Apogee: 5000km
2. Lunar orbit 2 - Perigee: 100km
Apogee: 5000km
3. Lunar orbit 3 - Perigee: 100km
Apogee: 100km
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Bhas_From_India
post Oct 23 2008, 09:23 AM
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Chandrayaan-1, India's first lunar orbiter, continued its long journey to the moon as operations planned by the
Indian Space Research Organisation scientists for raising its orbit went on satisfactorily on Thursday.....
The health of the spacecraft is normal seems to be normal.
The orbit-raising operations were carried out by scientists at ISRO's (ISTRAC) along with experts from ISRO centres.
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mps
post Oct 23 2008, 10:31 AM
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QUOTE (Bhas_From_India @ Oct 23 2008, 12:23 PM) *
as operations planned by the
Indian Space Research Organisation scientists for raising its orbit went on satisfactorily on Thursday.....


'Satisfactorily'? Normaly the PR-folks prefer to say 'as planned', 'as expected' or something like that. I'm curious if there has been some minor anomalies during operations?
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ugordan
post Oct 23 2008, 10:35 AM
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These aren't western PR folks, though.


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djellison
post Oct 23 2008, 11:35 AM
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English is a second language for the C1 team - and to be honest, I think they're doing an awesome job of it so far.

Doug
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ugordan
post Oct 23 2008, 11:44 AM
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Indeed. It's also probably a cultural difference thing.


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ngunn
post Oct 23 2008, 11:56 AM
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Ha!-I noticed this too. It makes you realise how we're twisting and mangling our own language. When exactly did 'satisfactory' come to mean 'just a whisker off disastrous'? Indeed it's refreshing to go to India or Pakistan and hear english words still being used properly.
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rlorenz
post Oct 23 2008, 12:05 PM
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QUOTE (Bhas_From_India @ Oct 22 2008, 08:29 PM) *
Why ISRO changed the orbit-transfer strategy - From Hindu

The revised strategy will have five earth-bound orbits
....
Increasing apogees
...
To calibrate the systems

etc..

First, thanks for posting these continued updates, Bhas. And congratulations.

I am curious, though, why this was a 'revised strategy'. I mean, it's all very well to
take things slow to do better orbit determination etc., but why not design that in from the
start - what new information led to this 'revision' ? Was it just contact with the reality
of doing the orbit determination, or something else ?
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Bhas_From_India
post Oct 23 2008, 12:49 PM
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QUOTE (rlorenz @ Oct 23 2008, 05:35 PM) *
etc..

First, thanks for posting these continued updates, Bhas. And congratulations.

I am curious, though, why this was a 'revised strategy'. I mean, it's all very well to
take things slow to do better orbit determination etc., but why not design that in from the
start - what new information led to this 'revision' ? Was it just contact with the reality
of doing the orbit determination, or something else ?


Thanks.
Final Approval for Chandrayaan-II with 486 Crore given last week by Cabinet.
Now, ISRO has a clear picture about future mission(s). This could be one reason.
I will look for any further explanation about this from ISRO.



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charborob
post Oct 23 2008, 01:16 PM
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Do we have any idea of ISRO's policy concerning the release of images to the public? I hope we will have access to the Chandrayaan-1 images, because I'm a bit frustrated by the low rate of release of the Kaguya images, not to mention Chang-e. I wonder if that last probe is still doing its thing up there, because we haven't had news for a long time.
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Bhas_From_India
post Oct 23 2008, 01:23 PM
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QUOTE (charborob @ Oct 23 2008, 06:46 PM) *
Do we have any idea of ISRO's policy concerning the release of images to the public? I hope we will have access to the Chandrayaan-1 images, because I'm a bit frustrated by the low rate of release of the Kaguya images, not to mention Chang-e. I wonder if that last probe is still doing its thing up there, because we haven't had news for a long time.


Have sent a mail to ISRO asking for these details yesterday.
Hope to receive a positive reply.
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elakdawalla
post Oct 23 2008, 06:00 PM
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There's an update on the ISRO website stating they just raised the orbit to 37,900 km, which doesn't match your numbers, Bhas. Could you post links to where you're getting your information?

--Emily


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Bhas_From_India
post Oct 24 2008, 03:25 AM
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QUOTE (elakdawalla @ Oct 23 2008, 11:30 PM) *
There's an update on the ISRO website stating they just raised the orbit to 37,900 km, which doesn't match your numbers, Bhas. Could you post links to where you're getting your information?

--Emily


Emily,

http://in.rediff.com/news/2008/oct/23imoon2.htm

- Bhas
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sssalvi
post Oct 24 2008, 06:28 AM
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There was a news item in Indian papers :

( Emily, ISRO website always gives a delayed reporting )

The LAM would be fired again on Friday (October 24) morning ( India time ) to take the spacecraft to an apogee of 73,000 km and a perigee of 300 km.

Hopefully they have done it by now.

Really speaking till this time it was in fact a more or less a routine launch of PSLV.
( PSLV has earlier launched satellites along equator apart from its intended application of Polar launches. Putting Chandrayaan in 305kms x 37900 kms is similar to a GTO transfer orbit. Such a maneuver was done earlier also using a PSLV )




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- SSSalvi
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mps
post Oct 24 2008, 06:29 AM
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QUOTE (Bhas_From_India @ Oct 23 2008, 03:49 PM) *
Final Approval for Chandrayaan-II with 486 Crore given last week by Cabinet.


486 Crore rupees, is it ca $97 million?
If only NASA and ESA could do so much with such a small budgets - what kind of planetary missions would we have right now...
(warning: unconstructive dreaming mode turned on)
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