Did Artemis I Miss the Moon?

Space is flat.
The moon is a hologram.
And Joe Biden is president.



Last Edited by BrainGuy: Q* on 11/27/2022 02:29 PM

And someone at JPL quietly says OOpsy.

People actually think a rocket launched from Earth GOES STRAIGHT UP to the Moon......

Sadly, yes. Even the spectator next to my telescope was all confused when it "went past the moon."

You know I'm no astronomer or expert in rocketry or spatial navigation.


I literally learned enough from watching old 1960s Disney reruns about the space program, along with 90s discovery channel to know wtf is going on.

It's shocking how little people learn today.

Of course Disney is more worried about being woke.

And who knows wtf is on discovery channel these days....I dont watch tv.

Last Edited by Bean223 on 11/27/2022 02:40 PM

which one of these three sentences is the most insane?

Children are taught how to put a condom on a "woman" on May Day now.

Nicely done.

It’s good to see NASA successfully launch something.

I would pay real money to see "TILT" light up in his eyes when that happens.

Astro... I have a question for you.

Are they just playing orbital mechanics games to conserve fuel? I mean 6 days to the moon, correct me if I'm wrong but didn't the Apollo missions only take 3 days?

To me it seems like they started from scratch for this mission... how long did it take from the initiation of this program? Perhaps this is what happens when NASA is on an un-expandable budget.

From a technical standpoint you are clearly in the top 10% of all GLP posters...

Remember Idol Harobed? (Deborah Lodi), those were the days... doing battle with IDW (Inter Dimensional Warrior).

IDW is still around here, he just doesn't use his screen name because he knows he's ban on sight. He likes to make threats and such to this day.

Anyway, to get to the meat of your question, yes the trajectory here is very different. SLS is a very different animal than the Saturn V, though both are super heavy lift. Saturn V had three stages, SLS has two solid boosters, a large core stage and at the moment a small "interim" upper stage. The Orion's service module does not have as much fuel and delta-V as the Apollo CSM had. To give you an idea, the Apollo CSM carried about 18,410 kg of propellant for the main SPS engine and the Apollo command module was a smaller capsule than Orion. Orion's European Service Module only has a propellant mass of about 8,600 kg and carries a heavier capsule. Ironically, both the CSM and European Service Module rely on versions of the AJ-10 engine, though Orion's is literally an old Space Shuttle OMS engine that has been repurposed for one more flight. Orion with its current service module cannot perform the mission profiles that Apollo's CSM could. It can't carry a lander into low lunar orbit and then get itself out of low lunar orbit for a return to earth.

Likewise, the ICPS is very under-powered compared to the mighty Saturn V upper stage, the S-IVB. The ICPS is really just a modified Delta upper stage, and it only carries about 28,576 kg of propellant mass vs 109,000 kg for the S-IVB. The upgraded Exploration Upper Stage or EUS will flip that statistic later on, but for now the ICPS is what Orion had to work with. Given these limitations and the nature of the SLS rocket's staging, the core stage put Orion and the ICPS into a slightly elliptical parking orbit that essentially gave the ICPS a "head-start" before the TLI burn (on the Saturn V, the S-IVB finished the orbit insertion itself and stayed in a low parking orbit until TLI). Even so, the ICPS and Orion cannot fly the kind of profile we saw with Apollo, so they opted for an easier but slower trajectory to a distant retrograde orbit of the moon, swinging wide past the moon each time and never braking fully into a low lunar orbit. This is similar to how later missions will utilize a halo orbit that stays farther from the moon than Apollo and a lunar lander that will meet Orion there and depart to the surface from a wider starting orbit. This trajectory does not require as much delta-V from Orion to do the mission and still get back to earth.

Last Edited by Astromut on 11/27/2022 05:23 PM

That is some outstanding & Cool analysis...!

.

You forgot - "Vaccine is Safe & Effective"...?

And "Barack Hussein Obama has a valid American birth certificate."

Man, there is no fucking way a grown ass man thought the rocket was going straight to the moon.

Yes, way. And I'll bet some of 'em have Liberal Arts degrees.

But, but, 53 years ago they landed on the moon effortlessly. It was as easy as putting your foot in a shoe. Now here we are 5 decades later with technology advanced about 50 thousand times yet they misses the moon???

I dunno. Maybe it’s just me but that sounds a tad, how you say?? Fishy.

Last Edited by Fugazi World on 11/27/2022 07:37 PM

Snoopy Come Home!!!

https://imgur.com/yjBvJ9s

Nothing easy about it and it took multiple uncrewed test flights followed by crewed test flights to prove out the rockets and spacecraft to be used to do it.

Thank you for that incredibly detailed explanation. Sorry I took so long to respond, but even though I'm retired there is always a distraction.... I have too many things to tend to. I realize some might say change things to simplify my life, but it just wouldn't be me. Take care, I wish for you a great holiday season.