Ever since I had the pleasure of meeting Emil Schiesser (of the Apollo Nav team) at JSC, I've been amazed at how little we knew about the Moon's gravity when we landed humans there. Here's a little video that (hopefully) illustrates what we knew then and how far we've come!

This can't be a real address. It's a little too on the nose

@TheOldManPar ah yes, the meatrahedron

I have a new phone wallpaper. Sorry, JWST Pillars of Creation, you've been replaced.

Holy crap.... haven't paid attention in a while, but @SpaceX is almost done with the 540 km shell. Only two planes have < 18 sats. (2893 satellites)

Today: Orion flew directly over the Apollo 11 landing site, Tranquility Base. On December 5th the Apollo landing sites will be lit by the sun for pictures to be taken.

After four months on its way, CAPSTONE will enter its near rectilinear halo orbit day after tomorrow, Sunday afternoon. It this episode, we talk about CAPSTONE, its NRHO, and Gateway. Can't wait to see the spacecraft in action around the moon.

Interested in Vulkan, Metal, WebGPU and DirectX 12? My company, a.i. solutions, is looking to hire a graphics engineer to work on our rendering pipeline and produce visualizations like these: https://t.co/PEKjIVpcVh

YES! Not crashing in space should be free. We love to see @sling_shot_aero on board with this mindset. It'll take all of us to make space sustainable. We're excited to share what Privateer will be contributing in a couple weeks at @amoscon. See you there!

Why didn't NASA do these comparisons to Hubble? Missed opportunity..... #JWST https://t.co/NHOlg0FyD2

Me and the boys too!

This recovery is the best news I've heard all day

And, there are currently at least 9 groups of satellites raising their orbits to the 540 shell.

I've been quiet for a while, but #Starlink deployment continues apace. #SpaceX is roughly 38% complete with the second shell at 540 km. Here are two separate views of the 547.5 km and 540 km shells, and an overview plot of the two shells combined.

Next week I'm hosting #FreeFlyerExpo by @ai_sol where users will be talking about how they use our astro software. 🚀 @MichaelVolle will be talking about #SpaceX #Starlink, among other great #virtual talks. Agenda and registration here:

Wow, looks like the force of capture would feel like hitting a brick wall a 20 miles per hour!

Kids, presents are going to have to wait until after the launch.....

Not another one..... Thankfully apoapsis for 13552 is ~490km, so below #Starlink (but still above #ISS), but it remains to be seen how much energy has been imparted on the debris cloud. 🤞 that the next several days are uneventful.

Earth-Moon L1 planar Lyapunov orbit viewed in the Moon-centered inertial frame. How cool is that. (Inspired by a colleague at Purdue in today's research meeting. A spirograph kind of afternoon.)

NASA's S-3C scientific satellite, the Energetic Particles Explorer D, named Explorer 26 after launch was launched on 1964 Dec 21 into an elliptical 310 x 26200 km x 20.1 deg orbit and operated for 2.4 years. Satcat number 963, it reentered 2021 Aug 23 after 56.7 years in space.