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by SSSalvi
06 Jan 2024 17:42
Forum: Science, Economics & Technology Forum
Topic: Aditya-L1 (आदित्य -L1): Launch and Discussions
Replies: 119
Views: 31564

Re: Aditya-L1 (आदित्य -L1): Launch and Discussions

Aditya-L1 in Halo orbit: 𝐈𝐧𝐝𝐢𝐚, 𝐈 𝐝𝐢𝐝 𝐢𝐭. 𝐈 𝐡𝐚𝐯𝐞 𝐫𝐞𝐚𝐜𝐡𝐞𝐝 𝐭𝐨 𝐦𝐲 𝐝𝐞𝐬𝐭𝐢𝐧𝐚𝐭𝐢𝐨𝐧! Aditya-L1 has successfully entered the Halo orbit around the L1 point. #ISRO #AdityaL1Mission #AdityaL1 https://forum.nasaspaceflight.com/index.php?action=dlattach;topic=33607.0;attach=2246376;image https://twitter.com/isros...
by SSSalvi
22 Dec 2023 19:32
Forum: Science, Economics & Technology Forum
Topic: Aditya-L1 (आदित्य -L1): Launch and Discussions
Replies: 119
Views: 31564

Re: Aditya-L1 (आदित्य -L1): Launch and Discussions

Amber G says in words... I, in drawing :) . Sun-Earth distance is 151 million km. Earth-L1 distance is 1.5 million km. 1% of the former. Earth Moon distance is 0.384 million km. One fourth of earth-L1 distance. Green line is Sun-L1 distance while Red line is L1-Earth distance. https://blogger.google...
by SSSalvi
04 Dec 2023 19:23
Forum: Science, Economics & Technology Forum
Topic: Aditya-L1 (आदित्य -L1): Launch and Discussions
Replies: 119
Views: 31564

Re: Aditya-L1 (आदित्य -L1): Launch and Discussions

Aditya Solar wind Particle Experiment (ASPEX) payload onboard India's Aditya-L1 satellite switched on on 1st Dec2023 ... working normal. https://www.isro.gov.in/Aditya-L1_ASPEX_instrument_begins_measurements.html https://www.isro.gov.in/media_isro/image/index/Aditya-L1_ASPEX_instrument_begins_measur...
by SSSalvi
26 Nov 2023 19:44
Forum: Science, Economics & Technology Forum
Topic: Aditya-L1 (आदित्य -L1): Launch and Discussions
Replies: 119
Views: 31564

Re: Aditya-L1 (आदित्य -L1): Launch and Discussions

Journey of ADITYA L1 to Halo orbit and the Halo orbit itself: ( Sorry for a longish post .. but I am helpless ) ( We will use ADI to refer to ADITYA_L1 ) With the capability of PSLV, maximum velocity that could be provided to ADI was about 9.7 kms/sec. To break Earth's gravity to reach L1 point the ...
by SSSalvi
08 Nov 2023 15:38
Forum: Science, Economics & Technology Forum
Topic: Aditya-L1 (आदित्य -L1): Launch and Discussions
Replies: 119
Views: 31564

Re: Aditya-L1 (आदित्य -L1): Launch and Discussions

The sensor obviously is not yet calibrated ( Notice the vertical units ARB for arbitrary ) but it clearly shows a fast response time as compared with the older sensors on other probes. In the post by URSC, they mention a very strong burst recorded at 1300 Hrs. They have ( rightly ) not disclosed at ...
by SSSalvi
20 Sep 2023 20:30
Forum: Science, Economics & Technology Forum
Topic: Chandrayaan 3: Launch and Discussions
Replies: 1352
Views: 542383

Re: Chandrayaan 3: Launch and Discussions

2mro, 21st ... 6 deg Sun Elevation at Landing site!!!
Time to wakeup if possible.
Waiting, fingers crossed... Will it ??? Will it not???
by SSSalvi
08 Sep 2023 17:33
Forum: Science, Economics & Technology Forum
Topic: Aditya-L1 (आदित्य -L1): Launch and Discussions
Replies: 119
Views: 31564

Re: Aditya-L1 (आदित्य -L1): Launch and Discussions

The image by ISRO is Earth centric so the Large Inflexion before entering L1 space is a bit confusing. https://akm-img-a-in.tosshub.com/indiatoday/styles/medium_crop_simple/public/2023-08/aditya_l1_d.jpg?VersionId=4V0zdH0YByi9Zoy7qoRmOLCEG_3I4w0y Plotted in a Sun centric view for Sept 23 to Feb 24 p...
by SSSalvi
06 Sep 2023 20:41
Forum: Science, Economics & Technology Forum
Topic: Aditya-L1 (आदित्य -L1): Launch and Discussions
Replies: 119
Views: 31564

Re: Aditya-L1 (आदित्य -L1): Launch and Discussions

That was expectation.. Planned trajectory of CH3 was available on Horizons at least a month before launch. Figures I posted midway in CH3 dhaga / Page4 were actually drawn before launch. Subsequently ISRO updated it with factual parameters ( Step by step ) as the EBN operations continued. Celestrak ...
by SSSalvi
06 Sep 2023 18:59
Forum: Science, Economics & Technology Forum
Topic: Aditya-L1 (आदित्य -L1): Launch and Discussions
Replies: 119
Views: 31564

Re: Aditya-L1 (आदित्य -L1): Launch and Discussions

I am really alarmed.
No update of A-L1 orbit parameters aka TLE.
Also ISRO not sharing Orbit parameters on Horizons.
Does it have something to do with ISRO- ESA tie-up for Precision orbit determination methodology?
by SSSalvi
06 Sep 2023 10:41
Forum: Science, Economics & Technology Forum
Topic: Aditya-L1 (आदित्य -L1): Launch and Discussions
Replies: 119
Views: 31564

Re: Aditya-L1 (आदित्य -L1): Launch and Discussions

We need to improve our rocket's thrust quickly. How long will it take for us to reach Venus If we use the slingshot method? Aditya l1 takes 109 days to cross 1.5 million km, Venus is 61 million km away. 😂😂 The central government should, first of all, assign funds for NGLV. Not much change .. For re...
by SSSalvi
05 Sep 2023 14:20
Forum: Science, Economics & Technology Forum
Topic: Aditya-L1 (आदित्य -L1): Launch and Discussions
Replies: 119
Views: 31564

Re: Aditya-L1 (आदित्य -L1): Launch and Discussions

Surprisingly, two EBNs over but the latest TLE available pertains to Launch Orbit.
by SSSalvi
05 Sep 2023 11:05
Forum: Science, Economics & Technology Forum
Topic: Aditya-L1 (आदित्य -L1): Launch and Discussions
Replies: 119
Views: 31564

Re: Aditya-L1 (आदित्य -L1): Launch and Discussions

Halo orbit of SOHO. Plotted for 1 year period. Z Axis is highly exaggerated to show the shape. Sun is at centre ( Green Dot ). Notice that SOHO ( Yellow Line ) is always within Earth orbit ( Brown ) ... At L1 point traversing North/South. Will attempt Earth to Sun looking direction later. https://bl...
by SSSalvi
04 Sep 2023 21:34
Forum: Science, Economics & Technology Forum
Topic: Aditya-L1 (आदित्य -L1): Launch and Discussions
Replies: 119
Views: 31564

Re: Aditya-L1 (आदित्य -L1): Launch and Discussions

AmberGji,
Any guess of 1 Halo orbit period? Hrs or days?
Played around with SOHO, but could not find any periodicity with different time periods.
by SSSalvi
04 Sep 2023 11:25
Forum: Science, Economics & Technology Forum
Topic: Aditya-L1 (आदित्य -L1): Launch and Discussions
Replies: 119
Views: 31564

Re: Aditya-L1 (आदित्य -L1): Launch and Discussions

Thanks, I got the saddle point analogy. ......... i am reasoning like this: let the z axis be the line connecting sun and earth.......... Using https://akm-img-a-in.tosshub.com/indiatoday/styles/medium_crop_simple/public/2023-08/aditya_l1_d.jpg?VersionId=4V0zdH0YByi9Zoy7qoRmOLCEG_3I4w0y My simplist...
by SSSalvi
02 Sep 2023 20:09
Forum: Science, Economics & Technology Forum
Topic: Chandrayaan 3: Launch and Discussions
Replies: 1352
Views: 542383

Re: Chandrayaan 3: Launch and Discussions

Image

Negotiating craters... U Turn from the edge of the crater ..... Walking on the edge of the crater......

Pragyan must have been trained on Indian .no-roads'.
by SSSalvi
01 Sep 2023 21:13
Forum: Science, Economics & Technology Forum
Topic: Indian Space Program: News & Discussion
Replies: 1010
Views: 591986

Re: Indian Space Program: News & Discussion

AdityaL1 Launch Kit doc is out!!!!

Now SRF should start new thread.

https://www.isro.gov.in/media_isro/pdf/ ... ochure.pdf
by SSSalvi
31 Aug 2023 19:36
Forum: Science, Economics & Technology Forum
Topic: Chandrayaan 3: Launch and Discussions
Replies: 1352
Views: 542383

Re: Chandrayaan 3: Launch and Discussions

Another instrument onboard the Rover confirms the presence of Sulphur (S) in the region, through another technique. The Alpha Particle X-ray Spectroscope (APXS) has detected S, as well as other minor elements. This finding by Ch-3 compels scientists to develop fresh explanations for the source of Su...
by SSSalvi
31 Aug 2023 19:32
Forum: Science, Economics & Technology Forum
Topic: Chandrayaan 3: Launch and Discussions
Replies: 1352
Views: 542383

Re: Chandrayaan 3: Launch and Discussions

Radio Anatomy of Moon Bound Hypersensitive Ionosphere and Atmosphere - Langmuir Probe (RAMBHA-LP) payload onboard Chandrayaan-3 Lander has made first-ever measurements of the near-surface Lunar plasma environment over the south polar region. The initial assessment indicates that the plasma near the ...
by SSSalvi
31 Aug 2023 19:07
Forum: Science, Economics & Technology Forum
Topic: Chandrayaan 3: Launch and Discussions
Replies: 1352
Views: 542383

Re: Chandrayaan 3: Launch and Discussions

Andhra Sugars, are ISRO's Major Supplier of UDMH , which run Vikas Engines. UDMH is a by-product for them. https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhtqw5LWhqoFqA4mFgJ6lG5ziXy6pzAtmc6puyrLgZjKWqLr2I_ZcTwwbEGPhCVjNaw00kM_hxgz8HcNkcmc5OIsTwFpA_ITQ2Gbxlh15Mdl2nOwZ2SI5FW5Q1MSeZssLKsEIAI...
by SSSalvi
31 Aug 2023 10:06
Forum: Science, Economics & Technology Forum
Topic: Chandrayaan 3: Launch and Discussions
Replies: 1352
Views: 542383

Re: Chandrayaan 3: Launch and Discussions

Vikram picture shows the amount of light available due to low Sun Elevation.
by SSSalvi
30 Aug 2023 19:50
Forum: Science, Economics & Technology Forum
Topic: Chandrayaan 3: Launch and Discussions
Replies: 1352
Views: 542383

Re: Chandrayaan 3: Launch and Discussions

Just because we are looking forward to AdityaL1...

There are following similar sounding objects in cosmos:
ADITI
ADITISINGH
ADISESHAN
ADITYAJAIN
ADITYAMOHAN
by SSSalvi
29 Aug 2023 11:48
Forum: Science, Economics & Technology Forum
Topic: Chandrayaan 3: Launch and Discussions
Replies: 1352
Views: 542383

Re: Chandrayaan 3: Launch and Discussions

Any reference on how AdityaL1 will communicate with Earth , considering that the big Noisy Sun disc is always behind the satellite?
by SSSalvi
28 Aug 2023 20:41
Forum: Science, Economics & Technology Forum
Topic: Chandrayaan 3: Launch and Discussions
Replies: 1352
Views: 542383

Re: JAXA mission SLIM/XRISM launch aborted

So near yet so Far.

Just at T-25 minutes, the Fully loaded and final countdown on, the Japanese Launch of SLIM/XRISM mission was aborted.
New date will be announced soon.
by SSSalvi
28 Aug 2023 12:34
Forum: Science, Economics & Technology Forum
Topic: Chandrayaan 3: Launch and Discussions
Replies: 1352
Views: 542383

Re: Chandrayaan 3: Launch and Discussions

TOI science reporter Chethan Kumar Tweet: Reg his interview with CH3 project director P Veeramuthuvel. https://twitter.com/chethan_dash/status/1696012812164763887 Some tidbits. ( BOLD emphasis is mine ) Pragyan, has negotiated its first obstacle — a crater whose depth is approximately 100mm — boosti...
by SSSalvi
28 Aug 2023 10:47
Forum: Science, Economics & Technology Forum
Topic: Chandrayaan 3: Launch and Discussions
Replies: 1352
Views: 542383

Re: Chandrayaan 3: Launch and Discussions

^^^ SSSalvi Sir, About RHU I dont think the news is credible. If it indeed carried one, the CH3PM needs to have the distinctive radiator fins. None of it was visible. DAE would have been involved from the very begining and safety measures would have different. Such things can't be done hush hush du...
by SSSalvi
27 Aug 2023 10:26
Forum: Science, Economics & Technology Forum
Topic: Chandrayaan 3: Launch and Discussions
Replies: 1352
Views: 542383

Re: Chandrayaan 3: Launch and Discussions

^^^
Very appropriate visualization rcase ji.
Admire your imagination of finding a suitable anology.
This can always be used for orbit understanding.
by SSSalvi
27 Aug 2023 08:53
Forum: Science, Economics & Technology Forum
Topic: Chandrayaan 3: Launch and Discussions
Replies: 1352
Views: 542383

Re: Chandrayaan 3: Launch and Discussions

Why no pic? Yesterday we saw lander facing sun for charging. Certain protocols and SOPs have to be followed. Only after that science can start. We must give them time. One thing is sure, they don't hide facts.. if there is a problem they will accept and tell. DSN speeds are always low for deep space...
by SSSalvi
26 Aug 2023 18:43
Forum: Science, Economics & Technology Forum
Topic: Chandrayaan 3: Launch and Discussions
Replies: 1352
Views: 542383

Re: Chandrayaan 3: Launch and Discussions

SSSalvi wrote: 26 Aug 2023 17:18 ^^^
Reversed probably for photo op of Mom( Lander).
No, facing Sun for charging.
by SSSalvi
26 Aug 2023 17:18
Forum: Science, Economics & Technology Forum
Topic: Chandrayaan 3: Launch and Discussions
Replies: 1352
Views: 542383

Re: Chandrayaan 3: Launch and Discussions

^^^
Reversed probably for photo op of Mom( Lander).
by SSSalvi
25 Aug 2023 18:20
Forum: Science, Economics & Technology Forum
Topic: Chandrayaan 3: Launch and Discussions
Replies: 1352
Views: 542383

Re: Chandrayaan 3: Launch and Discussions

Q. Will the earth 'rise' and 'set' be the equivalent of waxing and waning of the earth, but will always be overhead (for a person on the moon's equator)? Q. Also during a lunar day, will the person on the moon will be (primarily) seeing places on the earth that are night? Q. Please correct me if I ...
by SSSalvi
25 Aug 2023 10:46
Forum: Science, Economics & Technology Forum
Topic: Chandrayaan 3: Launch and Discussions
Replies: 1352
Views: 542383

Re: Chandrayaan 3: Launch and Discussions

Curiously ,ISRO Tweeted but withdrew this

Image of CH3 Lander by CH2 Orbiter camera

Image
by SSSalvi
25 Aug 2023 08:42
Forum: Science, Economics & Technology Forum
Topic: Chandrayaan 3: Launch and Discussions
Replies: 1352
Views: 542383

Re: Chandrayaan 3: Launch and Discussions

^^^
1, Engine shutoff earlier ... to avoid large dust settling on solar panels??
2. Why ISRO in its official posting on Reddit use a Camera photo of screen instead of actual screen sharing? Very bad of ISRO PR.
by SSSalvi
25 Aug 2023 08:08
Forum: Science, Economics & Technology Forum
Topic: Chandrayaan 3: Launch and Discussions
Replies: 1352
Views: 542383

Re: Chandrayaan 3: Launch and Discussions

The Vikram Lander touched down with a vertical velocity of 0.983 m/s and a horizontal velocity of 0.053 m/s. Faaar below the maximum 3 m/s which Vikram's landing legs were designed to withstand. #Chandrayaan3 That also explains why the dust cloud at touchdown was far below the expected ( just a com...
by SSSalvi
25 Aug 2023 07:43
Forum: Science, Economics & Technology Forum
Topic: Chandrayaan 3: Launch and Discussions
Replies: 1352
Views: 542383

Re: Chandrayaan 3: Launch and Discussions

^^^ (WRT to far site of the moon) Is this because of the size of the earth being bigger? It is same why we see only one side of Moon. This side will always face Earth, although it will see Earth in rotation and all equatorial surface will be seen over about 1 earth day. Added later: After posting I...
by SSSalvi
24 Aug 2023 21:40
Forum: Science, Economics & Technology Forum
Topic: Chandrayaan 3: Launch and Discussions
Replies: 1352
Views: 542383

Re: Chandrayaan 3: Launch and Discussions

i believe the lander entered a re target mode , to assess if re targeting was required, it did not find the need to re target, and so continued to move vertically downwards as was shown in the live animation and completed the landing nominally. If you observe the set of images ( while PM sir seen w...
by SSSalvi
24 Aug 2023 20:58
Forum: Science, Economics & Technology Forum
Topic: Chandrayaan 3: Launch and Discussions
Replies: 1352
Views: 542383

Re: Chandrayaan 3: Launch and Discussions

didn't take these termites very long to come crawling out of the woodwork The @isro dreamt of by Pandit Nehru, nurtured by Indira Gandhi ji, and taken to great heights by Rajiv Gandhi ji and Dr. Manmohan Singh ji achieves a new milestone! A proud moment for all, as we excitedly watch the #Chandraya...
by SSSalvi
24 Aug 2023 12:06
Forum: Science, Economics & Technology Forum
Topic: Chandrayaan 3: Launch and Discussions
Replies: 1352
Views: 542383

Re: Chandrayaan 3: Launch and Discussions

^^^
DD thinks that it HAS TO use its camera.

When you are in control room, can you not CONNECT one terminal as a feed?