Artemis 2 Launch - Going Back to the Moon

[Letterkenny]

And that's because of the burn from a few days ago I'm guessing?

I'm not sure which burn you are referring to, but I think it went like this:

1. Launch into orbit around the Earth.
2. Engine burn to enter into a big elliptical orbit around the Earth that intersects with the moon's orbit. After this they're basically a ballistic object coasting along their orbital path, with the exception of #3.
3. Small course/speed correction burns as needed to keep them on the right orbit/trajectory since it's very difficult to get the trajectory/speed 100% right from the burn in #2.
4. Not they're coasting back to Earth. They mat have another course correction burn planned, I can't remember. Or cancel it if it's not needed.

There are tons of great youtube videos on orbital mechanics, and walk through this entire mission. It is VERY cool stuff.

Waterloo's own Everyday Astronaut has good stuff on all things space travel/rocket technology. Here's a video walking through the Artemis 2 mission.

 

[1SEIACLONE]

I get that but many of us weren't alive when those happened. So it's cool to watch happen.

Without a doubt it's cool to see again, I was talking about how they keep talking like we have never done it before.

 

[Letterkenny]

Still an orbital path around the moon, just an open orbit, not a closed orbit.

Fair point. I wasn't sure if the term 'orbit' required a path that would ensure at least one full revolution around the object. Good to know!

 

[Gonzo]

I'm not sure which burn you are referring to, but I think it went like this:

1. Launch into orbit around the Earth.
2. Engine burn to enter into a big elliptical orbit around the Earth that intersects with the moon's orbit. After this they're basically a ballistic object coasting along their orbital path, with the exception of #3.
3. Small course/speed correction burns as needed to keep them on the right orbit/trajectory since it's very difficult to get the trajectory/speed 100% right from the burn in #2.
4. Not they're coasting back to Earth. They mat have another course correction burn planned, I can't remember. Or cancel it if it's not needed.

There are tons of great youtube videos on orbital mechanics, and walk through this entire mission. It is VERY cool stuff.

Waterloo's own Everyday Astronaut has good stuff on all things space travel/rocket technology. Here's a video walking through the Artemis 2 mission.

I was meaning the TLI burn that set them on the path from 4-5 days ago.

 

[Gonzo]

I so admire smart people. Lol.

 

[1SEIACLONE]

That's interesting to me because I figured once you're pulled into the moon's orbit the distance between your craft and the moon would be the same every time. Guess not.

That are also not going to orbit to land, so much like Apollo 13 are just circling and then heading back home. If they were landing, they would fall into orbit which would put them closer to the moon, and therefore closer to the earth.

 

[CascadeClone]

Some of y'all never took Aero 351 "Astrodynamics" and it shows.

Orbital mechanics, conic sections, the math, ellipses, parabola, changes in energy and speed based on velocity and distance... its so beautifully, elegantly, brilliantly simple. I love it, its incredible to me.

If you want to geek out about it, investigate the equations and derivations to see how it works. It's just so damn simple.

 

[clone52]

Fair point. I wasn't sure if the term 'orbit' required a path that would ensure at least one full revolution around the object. Good to know!

Closed orbits are where the object can't except gravity, so elliptical or circular. Open orbits can be parabolic or hyperbolic.

The astronauts corrected a reporter after their Trans Lunar Injection burn, who asked them what it was like to be out of earth or it. They corrected him and said they were still in earth orbit.

 

[clone52]

Some of y'all never took Aero 351 "Astrodynamics" and it shows.

Orbital mechanics, conic sections, the math, ellipses, parabola, changes in energy and speed based on velocity and distance... its so beautifully, elegantly, brilliantly simple. I love it, its incredible to me.

If you want to geek out about it, investigate the equations and derivations to see how it works. It's just so damn simple.

View attachment 170105

Chimenti?

 

[mj4cy]

Anyone else "cut onions" today when the crew asked about an unnamed crater being named after Reid Wiseman's late wife?

 

[CascadeClone]

Chimenti?

LOL. Tannehill.

The only guys still teaching that I had are Vinay Dayal and PJ Sherman (not to be confused with PJ Hermann, who I also had).

Hell, one of my classmates (a year or two behind) is a prof there now.

 

[Urbandale2013]

 

[interrobang]

Some of y'all never took Aero 351 "Astrodynamics" and it shows.

Orbital mechanics, conic sections, the math, ellipses, parabola, changes in energy and speed based on velocity and distance... its so beautifully, elegantly, brilliantly simple. I love it, its incredible to me.

If you want to geek out about it, investigate the equations and derivations to see how it works. It's just so damn simple.

View attachment 170105

Wasn't expecting to see that book cover again haha. Has all my favorite bedtime stories in it!

 

[jcf817]

Without a doubt it's cool to see again, I was talking about how they keep talking like we have never done it before.

Were you watching the NASA feed? It seemed like they were very clear about the things that had never been done before and the things that haven't been done in over 50 years.

 

[aeroclone]

Some of y'all never took Aero 351 "Astrodynamics" and it shows.

Orbital mechanics, conic sections, the math, ellipses, parabola, changes in energy and speed based on velocity and distance... its so beautifully, elegantly, brilliantly simple. I love it, its incredible to me.

If you want to geek out about it, investigate the equations and derivations to see how it works. It's just so damn simple.

View attachment 170105

Love this book!

Astrodynamics over aerodynamics all day, every day.

 

[riceville98]

Were you watching the NASA feed? It seemed like they were very clear about the things that had never been done before and the things that haven't been done in over 50 years.

I also think we have much better cameras available n6w. The quility of the imagry was very stunning!

 

[riceville98]

Anyone else "cut onions" today when the crew asked about an unnamed crater being named after Reid Wiseman's late wife

that was a cool moment and i think his 2 daughters were in the family viewing ar
ea watching.

 

[BandAlum]

Love this book!

Astrodynamics over aerodynamics all day, every day.

I still have that book sitting on my shelf at work. Had Ping Lu as my prof in the early 90's...

 

[viking63]

Some of y'all never took Aero 351 "Astrodynamics" and it shows.

Enjoyed taking Aero 351 with Dr. Tannehil circa 1990.

 

[coolerifyoudid]

Love this book!

Astrodynamics over aerodynamics all day, every day.

username.....

doesn't check out?