Author Topic: Chandrayaan-2 Mission - Launch and Landing Coverage  (Read 479682 times)

Offline abcd_indya

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Re: Chandrayaan-2 - GSLV MkIII - July 22, 2019 (09:13 UTC)
« Reply #780 on: 08/21/2019 03:02 am »
It is interesting that after initial sets of pictures that were released, no more pictures have been released considering the importance of this mission. No full view of earth, no selfie, no first pics of moon etc. Was really hoping to see some fantastic images from Chandrayaan-2!

Offline chota

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Re: Chandrayaan-2 - GSLV MkIII - July 22, 2019 (09:13 UTC)
« Reply #781 on: 08/21/2019 08:09 am »
Quote
Second Lunar bound orbit maneuver for Chandrayaan-2 spacecraft was performed successfully today (August 21, 2019) beginning at 1250 hrs IST as planned, using the onboard propulsion system. The duration of the maneuver was 1228 seconds. The orbit achieved is 118 km x 4412 km.

All spacecraft parameters are normal.

The next Lunar bound orbit maneuver is scheduled on August 28, 2019 between 0530 - 0630 hrs IST.

https://www.isro.gov.in/update/21-aug-2019/chandrayaan-2-update-second-lunar-orbit-maneuver

Yesterday's orbit after LOI : 114 km x 18072 km.
Today's Orbit after first of the planned 4 Lunar Bound Phase maneuvers : 118 km x 4412 km.
Planned next dates of maneuver : 28 Aug, 30 Aug and 1 Sep
Target to achieve by 2 Sep : 114km X 128km
« Last Edit: 08/21/2019 08:15 am by chota »

Offline seshagirib

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Re: Chandrayaan-2 - GSLV MkIII - July 22, 2019 (09:13 UTC)
« Reply #782 on: 08/21/2019 08:42 am »
^
118km x 4412 km : achieved
vs
121km x 4303 km : planned
« Last Edit: 08/21/2019 08:42 am by seshagirib »

Offline seshagirib

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« Last Edit: 08/22/2019 04:27 am by seshagirib »

Offline chota

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« Last Edit: 08/22/2019 02:17 pm by chota »

Offline sturmanskie

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Re: Chandrayaan-2 - GSLV MkIII - July 22, 2019 (09:13 UTC)
« Reply #785 on: 08/23/2019 01:41 am »
What could be the reasons for very few photos or videos emerging out of the mission so far? Lack of planning, Energy conservation, lack of cameras or just delay in receipt /processing image data? It is a pity that mission of this magnitude has so few visual records to share with the common man in India.
« Last Edit: 08/23/2019 02:05 am by sturmanskie »

Offline Phil Stooke

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Re: Chandrayaan-2 - GSLV MkIII - July 22, 2019 (09:13 UTC)
« Reply #786 on: 08/23/2019 03:41 am »
The mission has barely started, and now all eyes are on the complex process of getting safely to the surface.  When Vikram lands there should be lots to see.

Offline abcd_indya

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Re: Chandrayaan-2 - GSLV MkIII - July 22, 2019 (09:13 UTC)
« Reply #787 on: 08/24/2019 07:48 pm »
What could be the reasons for very few photos or videos emerging out of the mission so far? Lack of planning, Energy conservation, lack of cameras or just delay in receipt /processing image data? It is a pity that mission of this magnitude has so few visual records to share with the common man in India.

Given that they would have liked to release more pictures and haven't indicates to me that most probably camera alignments within orbit parameters weren't conducive enough to get them. I would have expected a full image of our blue planet, a selfie etc but mission goals definitely trumps PR images...



Offline Steven Pietrobon

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Re: Chandrayaan-2 - GSLV MkIII - July 22, 2019 (09:13 UTC)
« Reply #790 on: 08/26/2019 07:08 am »
Link is pointing to the same one as above:

twitter.com/isro/status/1164535259561517058
« Last Edit: 08/26/2019 07:09 am by Steven Pietrobon »
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Online TheVarun

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Re: Chandrayaan-2 - GSLV MkIII - July 22, 2019 (09:13 UTC)
« Reply #791 on: 08/26/2019 01:04 pm »
https://www.isro.gov.in/update/26-aug-2019/images-of-lunar-surface-captured-terrain-mapping-camera-2-tmc-2-of-chandrayaan-2

  Many pics of the Moon, many different craters. Have any of these been photographed for the first time?

Offline JH

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Re: Chandrayaan-2 - GSLV MkIII - July 22, 2019 (09:13 UTC)
« Reply #792 on: 08/26/2019 03:06 pm »
LRO has made global maps at 100 m resolution, so nothing in the Chandrayaan-2 images released so far should be unknown. It might discover very small craters later on, as LRO hasn't finished global coverage with its narrow angle camera, which can achieve 0.5 m resolution.

Offline sanjaykumar

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Re: Chandrayaan-2 - GSLV MkIII - July 22, 2019 (09:13 UTC)
« Reply #793 on: 08/26/2019 05:13 pm »

Offline seshagirib

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Re: Chandrayaan-2 - GSLV MkIII - July 22, 2019 (09:13 UTC)
« Reply #794 on: 08/28/2019 04:22 am »
Quote
August 28, 2019

Third Lunar Orbit Maneuver
Third Lunar bound orbit maneuver for Chandrayaan-2 spacecraft was performed successfully today (August 28, 2019) beginning at 0904 hrs IST, using the onboard propulsion system. The duration of the maneuver was 1190 seconds. The orbit achieved is 179 km x 1412 km.
All spacecraft parameters are normal.
The next Lunar bound orbit maneuver is scheduled on August 30, 2019 between 1800 - 1900 hrs IST.

ISRO update for 3rd lunar burn.

Offline seshagirib

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Re: Chandrayaan-2 - GSLV MkIII - July 22, 2019 (09:13 UTC)
« Reply #795 on: 08/28/2019 04:27 am »
179km x 1412km -achieved
Vs
178km x 1411km -planned

!!!!!!!!

Offline Ken the Bin

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Re: Chandrayaan-2 - GSLV MkIII - July 22, 2019 (09:13 UTC)
« Reply #796 on: 08/30/2019 01:57 pm »
https://twitter.com/isro/status/1167426278862929920

Quote from: ISRO
#ISRO
Fourth Lunar bound orbit maneuver for Chandrayaan-2 spacecraft was performed successfully today (August 30, 2019) at 1818 hrs IST.

For details please visit https://bit.ly/2L7UuKo

Offline Ken the Bin

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Re: Chandrayaan-2 - GSLV MkIII - July 22, 2019 (09:13 UTC)
« Reply #797 on: 08/30/2019 02:01 pm »
Chandrayaan-2 update: Fourth Lunar Orbit Maneuver

Quote
Fourth Lunar bound orbit maneuver for Chandrayaan-2 spacecraft was performed successfully today (August 30, 2019) beginning at 1818 hrs IST as planned, using the onboard propulsion system. The duration of the maneuver was 1155 seconds. The orbit achieved is 124 km x 164 km.

All spacecraft parameters are normal.

The next Lunar bound orbit maneuver is scheduled on September 01, 2019 between 1800 - 1900 hrs IST.

Offline chota

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Re: Chandrayaan-2 - GSLV MkIII - July 22, 2019 (09:13 UTC)
« Reply #798 on: 09/01/2019 07:10 am »
What happens during Lander-Orbiter Separation (Currently planned @ 12.10 am IST on 3 Sep)


> After successful manoeuvre on August 30 and September 1, the integrated spacecraft has reached an orbit ideal for separation

> On Monday (02 Sep), after the integrated spacecraft is stabilized in an orbit ideal for separation— which is estimated to be 121km X 125km— ISRO will load the sequence of commands for the separation, which will then be autonomously executed by the onboard systems

> The cylindrical structure on top of the orbiter— the extension of the fuel tank— is where the lander with the rover inside it is sitting. Both these modules are held together by clamps with two bolts

> Two halves of a metal flat spring are used to hold orbiter and lander. The springs are pre-loaded using two bolts. These bolts will be sheared(using pyrotechnic bolt cutter) and once these two bolts are cut the lander gets released

>This system has high strength and stiffness when clamped and releases quickly—typically in less than 50 milliseconds when command is given. Both of these operational characteristics are considered very important

> The separation itself will take only a fraction of a second.

> Generally, the timing for manoeuvre isn’t finalized until the day of the operation. We have estimates and sometimes a manoeuvre can be carried out a few hours before our first estimate and sometimes it may be a few hours after our first estimate

> Once the separation is successful, India will only be less than a week away from Moon landing, which is scheduled for 1.55am on September 7

> On September 3, a day after the separation, the mission control center in Bengaluru will run a ‘health check’ on Vikram and on September 4, Isro will do a de-orbit manoeuvre for 6.5 seconds to put Vikram in the lunar landing mode.

> We will check the parameters when the lander is in a 35km x 97km orbit. At 1.40am on September 7, the powered descent will start, and at about 1.55am, the lander will make the touchdown

Source: https://timesofindia.indiatimes.com/india/chandrayaan-2-isro-readies-for-landing-module-separation/articleshow/70929834.cms
« Last Edit: 09/01/2019 07:11 am by chota »

Offline seshagirib

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Re: Chandrayaan-2 - GSLV MkIII - July 22, 2019 (09:13 UTC)
« Reply #799 on: 09/01/2019 01:24 pm »
The fifth lunar burn done:

https://www.isro.gov.in/chandrayaan2-latest-updates

Quote
September 01, 2019

Fifth Lunar Orbit Maneuver

The final and fifth Lunar bound orbit maneuver for Chandrayaan-2 spacecraft was performed successfully today (September 01, 2019) beginning at 1821 hrs IST as planned, using the onboard propulsion system. The duration of the maneuver was 52 seconds. The orbit achieved is 119 km x 127 km.

All spacecraft parameters are normal.

The next operation is the separation of Vikram Lander from Chandrayaan-2 Orbiter, which is scheduled on September 02, 2019, between 1245 1345 hrs (IST). Following this, there will be two deorbit maneuvers of Vikram Lander to prepare for its landing in the south polar region of the moon.

 

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