Correct_Inspection25 t1_j6ahg5v wrote on January 28, 2023 at 10:50 PM

Reply to comment by Kellymcdonald78 in NASA's 'Mega Moon Rocket' aced first flight and is ready for crewed Artemis II launch by sasko12

Wait so SLS doesn’t use the Artemis rad hardened crewed vehicle? NASA seemed to indicate the SLS launches Artemis to the moon.

I would re-read the latest SpaceX HLS submission to NASA, it included major changes including rad hardening (including moving tanks of water, supplies and fuel for radiation shielding of humans and key systems).

What orbit does the ISS station occupy? [Hint it’s inside the protection of the Van Allen belts at 240 miles. Max LEO orbit is 1,200 miles in altitude.]

Kellymcdonald78 t1_j6aiipl wrote on January 28, 2023 at 10:58 PM

You said SLS is rad hardened not Artemis (Artemis isn’t even a vehicle, it’s a programme). Orion is “rad hardened” but except for the second stage, SLS doesn’t even leave LEO.

I’ve read the SpaceX submission. They’ve made a few changes to help reduce crew impact in the event of a CME, but the electronics are not rad hardened (radiation hardened CPUs and memory don’t have the performance SpaceX needs)

You also said that Commercial Crew gets an “exemption” because of they’re “short LEO missions”. Hint: they aren’t short

Correct_Inspection25 t1_j6ap550 wrote on January 28, 2023 at 11:48 PM

Apologies, I was using short in reference to the maximum amount of time SpaceX allows unused Dragons to be docked in LEO to the iSS for 119 days before risk of radiation wear on systems violates crew safety risk parameters in powered down safety mode. Looks like one dragon’s ( maybe Endeavor?) panels maintained their solar production up until 210 days before failing threshold. Active use for dragon is 10 rated for 10 days in LEO.