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Artemis II safely splashes down

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Re: Artemis II safely splashes down

#11

Post by areoform »

Glad that they're safe and sound.

It's worth pointing out that this is the first extremely public, widely acknowledged high risk mission NASA has done in over 50 years. The Shuttle was risky, but it wasn't thought of or acknowledged by NASA as being risky until very late in its lifecycle.

According to NASA's OIG, Artemis acceptable crew mortality rate is 1 in 30. Roughly 3x riskier than the shuttle. There genuinely is a world where they don't make it back home.

I am grateful that they did. And I'm grateful that we're going to go even further. I can't wait to see what Jared's cooking up (for those who don't know, he made his own version of the Gemini program in Polaris and funded it out of pocket).

Re: Artemis II safely splashes down

#12

Post by llbbdd »

java-man wrote: post #9

I noticed a delay between video and audio - the announcer on the NASA official live broadcast said splashdown before the the capsule splashed down on video. Was it intentional (in case something happened)? Also, what were these puffs on thermal camera after the main chutes were deployed? https://www.youtube.com/live/m3kR2KK8TEs

I was wondering about that too, I assume maybe there was some additional adjustments needed to land in the right spot, but they didn't mention it on the stream.

Re: Artemis II safely splashes down

#13

Post by shoghicp »

java-man wrote: post #9

I noticed a delay between video and audio - the announcer on the NASA official live broadcast said splashdown before the the capsule splashed down on video. Was it intentional (in case something happened)? Also, what were these puffs on thermal camera after the main chutes were deployed? https://www.youtube.com/live/m3kR2KK8TEs

RCS (Reaction Control System) which you can see on Artemis I internal video as it falls down https://www.youtube.com/watch?v=-QbYrs5SZ5M

Re: Artemis II safely splashes down

#14

Post by loloquwowndueo »

llbbdd wrote: post #8
Levitating wrote: post #5

Earlier quoted context omitted.

The LOS was also more than 6 minutes as predicted (I measured a bit over 7 minutes). What a tension.

I wasn't clear, was the LOS just comms or a full loss of telemetry from the craft? Either way, terrifying.

Everything. No radio signals make it in or out of the capsule due to ionization from the heat and plasma of reentry.

Re: Artemis II safely splashes down

#15

Post by java-man »

llbbdd wrote: post #12
java-man wrote: post #9

I noticed a delay between video and audio - the announcer on the NASA official live broadcast said splashdown before the the capsule splashed down on video. Was it intentional (in case something happened)? Also, what were these puffs on thermal camera after the main chutes were deployed? https://www.youtube.com/live/m3kR2KK8TEs

I was wondering about that too, I assume maybe there was some additional adjustments needed to land in the right spot, but they didn't mention it on the stream.

Yeah, they looked intentional - there are no reaction wheels on the capsule.

Re: Artemis II safely splashes down

#17

Post by hydrogen7800 »

java-man wrote: post #9

I noticed a delay between video and audio - the announcer on the NASA official live broadcast said splashdown before the the capsule splashed down on video. Was it intentional (in case something happened)? Also, what were these puffs on thermal camera after the main chutes were deployed? https://www.youtube.com/live/m3kR2KK8TEs

My suspicion was they were burning excess propellant, rather than attitude adjustment while under the parachutes. Though who knows how much propellant remained. It could be quite a bit more than it appears was used.

Re: Artemis II safely splashes down

#18

Post by philistine »

loloquwowndueo wrote: post #14
llbbdd wrote: post #8

Earlier quoted context omitted.

I wasn't clear, was the LOS just comms or a full loss of telemetry from the craft? Either way, terrifying.

Everything. No radio signals make it in or out of the capsule due to ionization from the heat and plasma of reentry.

I’ll note, since it is supremely interesting to me, that Starship is able to communicate with the ground during its whole reentry due to its sheer size and ability to connect with Starlink satellites. I assumed loss of signal due to reentry was a given for any spaceship!
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