Author Topic: Chandrayaan-2 Mission - Launch and Landing Coverage  (Read 480538 times)

I have put together a very rudimentary 2D animation of the Chandrayaan 2 orbit based on orbit data available from JPL/NASA HORIZONS interface:

http://sankara.net/chandrayaan2.html

The animation works better on larger screens like those of a typical PC/laptop. The UX is not great on mobiles - hope to fix it in the next few days.

The orbit data from JPL is available only until 21st August, 2019. I will update the animation as and when updated orbit data is available.


Offline lamid

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Re: Chandrayaan-2 - GSLV MkIII - July 22, 2019 (09:13 UTC)
« Reply #761 on: 08/15/2019 02:38 am »
I have put together a very rudimentary 2D animation of the Chandrayaan 2 orbit based on orbit data available from JPL/NASA HORIZONS interface:

Great job.

Offline lamid

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Re: Chandrayaan-2 - GSLV MkIII - July 22, 2019 (09:13 UTC)
« Reply #762 on: 08/15/2019 03:43 pm »
New data
https://ssd.jpl.nasa.gov/horizons.cgi#top
TRAJECTORY:
  This is a merge of post-launch trajectory solutions fit to tracking data
  through 2019-Aug-14 (post-TLI), with a prediction (released August 14)
  covering the interval August 14 to September 16.

  Trajectory name                             Start (TDB)        Stop (TDB)
  ----------------------------------------- ----------------- -----------------
  ch2o_spk_190722-[190810_od0*]_v*_dsn.V0.* 2019-Jul-22 09:31 2019-Aug-06 10:21
  ch2o_traj_190806-190916_planning_v1_V0.1  2019-Aug-06 10:21 2019-Sep-16 00:00
« Last Edit: 08/15/2019 08:05 pm by lamid »

Offline lamid

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Re: Chandrayaan-2 - GSLV MkIII - July 22, 2019 (09:13 UTC)
« Reply #763 on: 08/16/2019 02:52 am »
Capture in the Moon's orbit in 3D
TRAJECTORY:
  This is a merge of post-launch trajectory solutions fit to tracking data
  through 2019-Aug-15 (post-TLI), with a prediction August 15-20.

  Trajectory name                             Start (TDB)        Stop (TDB)
  ----------------------------------------- ----------------- -----------------
  ch2o_spk_190722-[190810_od0*]_v*_dsn.V0.* 2019-Jul-22 09:31 2019-Aug-20 10:21

original 3d graph:
https://plot.ly/~Lamid/9
« Last Edit: 08/16/2019 03:01 am by lamid »

I have updated my animation with support to view XY, XZ, and YZ planes. I have also added support to view the orbit relative to Earth or Moon.

http://sankara.net/chandrayaan2.html


Offline lamid

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Re: Chandrayaan-2 - GSLV MkIII - July 22, 2019 (09:13 UTC)
« Reply #765 on: 08/16/2019 10:54 am »
I have updated my animation with support to view XY, XZ, and YZ planes.

good idea
Is the orientation correct?
Coordinate Origin [change] :    Geocentric [500]
Coordinate systm: Earth Mean Equator and Equinox of Reference Epoch

« Last Edit: 08/16/2019 11:16 am by lamid »

I am using:

Coordinate systm: Ecliptic and Mean Equinox of Reference Epoch                 


I think that explains the difference you see in orientation.
« Last Edit: 08/16/2019 02:33 pm by kvsankar »

Offline lamid

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Re: Chandrayaan-2 - GSLV MkIII - July 22, 2019 (09:13 UTC)
« Reply #767 on: 08/16/2019 03:21 pm »
I am using:
Coordinate systm: Ecliptic and Mean Equinox of Reference Epoch                 

Yes, I understand.
How to choose it on Horizons?
Coordinate Origin [change] :???

Or calculated from ssb(solar system barycenter)?




I use the VECTORS ephemeris type and that in turn uses the Ecliptic and Mean Equinox of Reference Epoch.

Offline lamid

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Re: Chandrayaan-2 - GSLV MkIII - July 22, 2019 (09:13 UTC)
« Reply #769 on: 08/16/2019 04:43 pm »
I find it:

Offline lamid

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Re: Chandrayaan-2 - GSLV MkIII - July 22, 2019 (09:13 UTC)
« Reply #770 on: 08/16/2019 05:15 pm »
Chandrayaan-2 capture in the Moon's orbit:
click for animation
« Last Edit: 08/16/2019 05:17 pm by lamid »

Offline lamid

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Re: Chandrayaan-2 - GSLV MkIII - July 22, 2019 (09:13 UTC)
« Reply #771 on: 08/18/2019 04:53 am »
Capturing Chandrayaan-2 at the Moon in equatorial and ecliptical coordinates.
The first image is the equator,
the other three in ecliptic from http://sankara.net/chandrayaan2.html
last is my in ecliptic.
My trajectory 2019-Aug-15 (post-TLI) with a prediction August 15-20
« Last Edit: 08/18/2019 05:13 am by lamid »

Offline lamid

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Re: Chandrayaan-2 - GSLV MkIII - July 22, 2019 (09:13 UTC)
« Reply #772 on: 08/19/2019 05:05 am »
According to TLE 19230.0 18.08.19 00:00 Chandrayaan-2 has an apogeum of 404,876.2 km.

Offline lamid

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Re: Chandrayaan-2 - GSLV MkIII - July 22, 2019 (09:13 UTC)
« Reply #773 on: 08/19/2019 05:53 am »
ISRO Press Meet on the occasion of Lunar Orbit Insertion of Chandrayaan-2 Mission
A Press Meet will be held at 1100 hrs (11:00 AM) on Tuesday, August 20, 2019 at ISRO Headquarters, New BEL Road, Bengaluru 560094 on ‘Chandrayaan-2 Mission after Lunar Orbit Insertion’.

https://www.isro.gov.in/update/19-aug-2019/isro-press-meet-occasion-of-lunar-orbit-insertion-of-chandrayaan-2-mission

Offline chota

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Re: Chandrayaan-2 - GSLV MkIII - July 22, 2019 (09:13 UTC)
« Reply #774 on: 08/20/2019 03:54 am »
Here's what #Chandrayaan2 will do in the next few mins:

1) At 9.02.21am IST command to ignite the engine. It will be a retro-burn.
2) 1745 secs later #LOI must be achieved
3) Speed to be reduced to 246.37m/sec
4) Propellent consumption 241kg
5) Target Moon orbit: 114.3x18072.1

https://mobile.twitter.com/ChethanKumarTOI

Offline lamid

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Re: Chandrayaan-2 - GSLV MkIII - July 22, 2019 (09:13 UTC)
« Reply #775 on: 08/20/2019 04:33 am »
Lunar Orbit Insertion (LOI) maneuver was completed successfully today (August 20, 2019) at 0902 hrs IST as planned, using the onboard propulsion system. The duration of maneuver was 1738 seconds. With this, Chandrayaan-2 was successfully inserted into a Lunar orbit. The orbit achieved is 114 km x 18072 km.


https://www.isro.gov.in/update/20-aug-2019/chandrayaan-2-update-lunar-orbit-insertion

Offline seshagirib

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Offline sanman

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Re: Chandrayaan-2 - GSLV MkIII - July 22, 2019 (09:13 UTC)
« Reply #777 on: 08/20/2019 07:46 am »
ISRO Press Conference following Lunar Orbital Insertion of Chandrayaan-2:


Offline chota

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Re: Chandrayaan-2 - GSLV MkIII - July 22, 2019 (09:13 UTC)
« Reply #778 on: 08/20/2019 09:12 am »
Here is a detailed plan from now till Sep 7 when the touchdown happens

Lunar Bound Phase (20 Aug till 1 Sep)

> After the LOI, Chandrayaan-2 has an inclination of 88 Degrees 
> The orbit achieved is 114 km x 18072 km.
> 4 manoeuvres are planned to put the spacecraft around 100km X 100km orbit   
> The manoeuvres will be conducted on August 21 (1 PM IST), 28, 30 and September 1   respectively

Lander Orbiter Separation (2 Sep)

> By Sep 2, Chandrayaan-2 is expected to be in a 114km X 128km orbit when Vikram will separate from orbiter
> A short 3 second health check  will be done on Vikram


Deboosting (3 Sep till 6 Sep)

> On Sep 3, Vikram will perform a de-orbit manoeuvre for 6.5 seconds where its orbit will be  35km X 97km 
> Vikram will need to reach a 30km X 100km orbit
> Here Vikram will achieve the planned inclination of 90 degrees

Powered Descend (7 Sep)

> On Sep 7 at 1.40 am (IST) the powered descent will start 
> Vikram will start its descent from a height of 30 km  (Speed 6120 km/h)
> A little over 10 minutes and 30 seconds later it will be 7.4 km from the  lunar surface  (Speed 526 km/h)
> In next 38 seconds,  it will reach an altitude of 5 Km   from the  lunar surface   (Speed 331 km/h)
> After another 89 seconds, it will reach an altitude of 400 m from the  lunar surface   
> Here Vikram will hover for 12 seconds 
> It again takes 66 seconds to reach to 100 m altitude from the  lunar surface   
> Again it will hover for  for 25 seconds  (Here Vikram decides whether to land or choose  an alternate spot)
> If it decides to land on the original spot, it takes 65 seconds  to reach a height of 10m
> If it decides to land on an alternate spot, it takes 40 seconds to reach an altitude of 60 m and then again drop to 10 m in next 25 seconds

Landing (7 Sep, 1.55 am IST/ 6 Sep, 8:25 pm UTC)

> From a height of 10 m to reach the lunar surface, it will take 13 seconds for a soft touchdown 
> All five of its engines will be firing during this time, till sensors tell them to shut off once all the four legs of the lander touch the surface 
> Moon landing is planned at 1.55 am IST on September 7 ( Sep 6, 8:25 pm UTC)
> Vikram will send back to Earth its first pictures after touchdown some 15 minutes later
> After four hours, Pragyan will crawl out of the lander

Source https://timesofindia.indiatimes.com/toireporter/author-Chethan-Kumar-479220652.cms
« Last Edit: 08/20/2019 11:38 am by chota »

Offline sanman

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Re: Chandrayaan-2 - GSLV MkIII - July 22, 2019 (09:13 UTC)
« Reply #779 on: 08/20/2019 01:11 pm »
@47:45 in the video I posted just above, Dr Sivan is asked about whether the hardware on the lunar surface could be expected to survive through the lunar night, and to function afterwards. @49:05 he says that the hardware has been qualified for survival, but that this could not be guaranteed.
« Last Edit: 08/20/2019 01:12 pm by sanman »

 

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