News Chandrayaan-2 mission news.

Sbb1413

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Re: Chandrayaan-2 mission news

According to Wikipedia, Vikram Sarabhai lander is scheduled to land on 7 September 2019, 01:55 IST (6 September 2019, 20:25 UTC).

Well, I need to stay wake up to see that the lander is landing on the Moon.
 

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do you know if there will be any live camera feed from the lander?
 

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Here's the official live stream:
[ame="https://www.youtube.com/watch?v=7iqNTeZAq-c"]Watch Live : Landing of Chandrayaan-2 on Lunar Surface[/ame]

I'm only expecting live telemetry and the occasional low res image, but lets see.
 

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Re: Chandrayaan-2 mission news

I need to set an alarm to 12:45 IST to wake up and watch the lander lands on the moon. Once landed, I will sleep again with joy.

Unfortunately, it would ruin my sleep!
 

Thunder Chicken

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Another feed is live now:


[ame="https://www.youtube.com/watch?v=SFf-vaX-3Yk"]Chandrayaan 2 Live Streaming - ISRO Chandrayaan 2 Moon Landing Live Updates Today Online HD - YouTube[/ame]


About an hour to touchdown (4:25 ET / 3:25 CT / 2:25 MT / 1:25 PT for CONUS folks) if all goes well.
 

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Damn, such a tough decision... Germany vs Netherlands or Chandrayaan 2 to the Lunar South Pole...
 

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Its only a footie match, and it'll be back around soon...
 

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Its only a footie match, and it'll be back around soon...


"Only a footie match".... :rofl:

---------- Post added at 21:54 ---------- Previous post was at 21:46 ----------

Important politician on site...what could possibly go wrong?

---------- Post added at 22:05 ---------- Previous post was at 21:54 ----------

Didn't the clock read -20 minutes before I went into the kitchen to get some icecream?
 

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The technical glitches in the lifestream are really weird, I remember India to be more perfectionist there.
 

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Is it now heading to lithobraking? :blink:

---------- Post added at 22:22 ---------- Previous post was at 22:21 ----------

Yes, that looks like a bad case of LOS
 

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Loss of telemetry never a good sign.
Was that area well surveyed?
 

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Loss of telemetry never a good sign.
Was that area well surveyed?


I am sure it was... I saw the lander in the visualization rotate heads down before the dive really accelerated and the signal was lost.



Maybe a software glitch when switching to fine landing mode.
 

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I am sure it was... I saw the lander in the visualization rotate heads down before the dive really accelerated and the signal was lost.

Maybe a software glitch when switching to fine landing mode.


I missed that. I hope it wasn't a sign error.


Tough luck.
 

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I missed that. I hope it wasn't a sign error.


Looked more like an attitude control failure, tumbling out of control. But it descended very fast, much faster than I would have expected from lunar gravity.
 

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I'm no expert in interpreting Doppler ;)

From https://forum.nasaspaceflight.com/index.php?topic=20324.msg1989823#msg1989823:
x0zG9Dl.png

index.php


My guess it that anything is possible. Perhaps it was really firing upside down :)
Anyway, the signal seems to be lost a bit high (around 300m per ISRO last data-point).
 
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Didn't look like tumbling, it really seemed to be upside down and firing.
It completely nulled horizontal speed and seemed to increase vertical - consistent with such a firing.

So perhaps a navigation software fault ? Those seem quite common recently...


At 2.5 km, it was heads down, while at 1.5 km, it was heads up again, which is why I wonder if it was tumbling.

The Doppler shift also suggests it was rotating rapidly.
 
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