Crew Dragon Demo-2: Launch success

  • SpaceX
  • Thread starter mfb
  • Start date
  • Tags
    Launch
  • Featured
In summary, SpaceX is launching a crew today in a new spacecraft, and for the first time it is a private spacecraft. The crew will enter the spacecraft just before the rocket is fueled, and the largest concern currently is the weather. If the launch needs to be delayed there are backup dates 3 and 4 days later.
  • #1
37,125
13,966
TL;DR Summary
Crewed spaceflight returns to the US
It doesn't happen every day decade that people are being launched to orbit in a new spacecraft . The last time it happened was 2003 (Shenzhou), and the last time before that was the Space Shuttle in 1981. The next time will be in 12 hours, if the weather stays good. And for the first time it is a private spacecraft . Going to orbit is no longer the exclusive domain of governments. You can call SpaceX if you want a ride (and have maybe 100 million dollars).

The first crewed launch of Dragon 2 is scheduled for today 20:33 UTC, in 11.5 hours. There is a detailed timeline here. The crew will enter Dragon 2.5 hours before take-off, fueling the rocket will begin 35 minutes before. After take-off the astronauts will need 9 minutes to reach orbit and about 19 hours to reach the ISS. The largest concern currently is the weather, the latest forecast sees a 60% chance that the weather will be good. If the launch needs to be delayed there are backup dates 3 and 4 days later.

Live coverage is about everywhere, most will start a few hours before the launch. NASA, SpaceX will have one, at Spaceflight Now, from the "Everyday Astronaut", from "Space Videos", from Florida Today

It hasn't been decided yet how long the crew will stay at the ISS, but the general expectation is 1-3 months. NASA has suggested to make the first routine flight (for long-term stays at the ISS) end of August, this demonstration mission should land before that.

There is a long list of conditions for the weather (that page is a summary) - for the launch site, but also for sites where the astronauts might land in case of an abort during the launch.

Historic coincidences: Doug Hurley and Bob Behnken will launch from same pad as the last Shuttle launch in 2011. The crew of that Shuttle launch left a US flag on the ISS, to be returned by the next crewed flight from the US. One of the crew members of that last Shuttle launch? Doug Hurley. He can now pick up the flag again. Oh, it's also the pad used for all Apollo flights apart from Apollo 10, and for the first Shuttle launch.

The crew will enter Dragon before the rocket is fueled. It allows SpaceX to load colder - more dense - propellant and launch while it is still cold, which means the rocket takes off with more propellant and more thrust, so it can put more mass into orbit while still recovering its first stage. This is an unusual procedure, and NASA was initially concerned about it. There are many things that can go wrong during fueling. On the other hand: Their capsule has an abort system that can get the astronauts away from the rocket quickly if they are in danger. This procedure also means they don't need astronauts and support crew to be outside near the fully fueled rocket (without an abort system).
 
Last edited:
  • Like
  • Informative
Likes DrClaude, Greg Bernhardt, anorlunda and 6 others
Physics news on Phys.org
  • #2
This may also be the first manned US mission with an "instantaneous" launch window.
If weather isn't good at 4:35pm local time, then it'll be scrubbed for the day.
And the crew is aboard.
 
  • #3
.Scott said:
with an "instantaneous" launch window
Why is the launch window so tight?
 
  • #4
berkeman said:
Why is the launch window so tight?
I believe it's to arrive in orbit already synced with the ISS orbit - thus shortening the rendevous time. That is the most common reason.
I will see if I can check that.
 
  • Like
Likes jim mcnamara and berkeman
  • #6
The crew was just told that a weather front over Orlando - and heading their way - appears to be eroding.

So the weather is looking better.
 
  • Like
Likes Greg Bernhardt
  • #7
.Scott said:
I believe it's to arrive in orbit already synced with the ISS orbit - thus shortening the rendezvous time. That is the most common reason.
I will see if I can check that.
It's more specific than that.
The launch site will cross the ISS orbital plane moments after the launch time.
Live ISS Orbit

Also, this verifies that this confirms this as the first human US flight with an instantaneous launch window:
https://blogs.nasa.gov/spacex/2015/06/28/launch-window-instantaneous-today/ said:
The now-retired space shuttle had 10 minutes and the Orbital ATK Antares rocket has had between five and 10 minutes.
 
Last edited:
  • #8
They could make something like a 3 minute launch window in terms of rocket performance - but if anything delays the launch then it won't be fixed in 3 minutes. No one is going to trust that 3 minute fix.

Weather is still a concern, but for the chance that it will be good they will continue to prepare for launch. The launch escape system is armed, propellant loading has started just now.

Edit: We'll get a (final?) weather update ~20:14.
 
Last edited:
  • #9
At T-20:00
Scrubbed for weather: Low clouds and lightning energy dissipation.
Hmmm - but they're hedging.
 
  • #11
.Scott said:
At T-20:00
Scrubbed for weather: Low clouds and lightning energy dissipation.
Hmmm - but they're hedging.
Huh? NASA's stream still counts down, even though it doesn't look promising.

Edit: Now it has been scrubbed. t-17:00
 
  • #12
They're giving it until T-17:00 - but they don't expect it to clear.
Launch abort just started.
 
  • #13
Weather forecast in 3 days is better.
 
  • #15
Greg Bernhardt said:
Why is the launch site in wet Florida and not somewhere more dry?
Closer to the equator - a little boost with Earth rotation.
And a safe place for East-bound boosters to fall.
 
  • Like
Likes Klystron and Greg Bernhardt
  • #16
It needs to be at the east coast as (nearly all) launches go east. For the ISS it could be further north, but for geostationary satellites (=most commercial launches) a launch site needs to be as close to the equator as possible, and having two sites would cost more. Three, actually, as SpaceX also launches from Vandenberg (west coast) for sun-synchronous ("polar") orbits.
 
  • Like
Likes Greg Bernhardt
  • #17
Maybe SpaceX needed some RainX.
:-p
 
  • #18
20 minute interview with Elon Musk and Jim Bridenstine the day before the launch attempt. NASA administrator Jim Bridenstine called it "dawn of a new era in spaceflight" (17:15). Generally the way NASA talks about commercial spaceflight changed a lot recently. From "this is something we can try, let's see if it works out" to "this changes the whole way we run NASA".
 
  • Like
Likes Greg Bernhardt
  • #20
t-5 minutes, weather is good, everything is ready for launch
 
  • #22
Successful launch. Dragon is in orbit. It will need 19 hours until it docks with the ISS.
The first stage landed on the drone ship in order to be reused on a future flight.
 
  • Like
Likes Greg Bernhardt and Dr.AbeNikIanEdL
  • #24
Minor mishap when the Dragon commander banged his forehead while entering the ISS. Probably due to muscles attuned to 1G operating in free fall and general excitement of a successful demo.

Inspiring flight and docking.
 
  • #25
SpaceX got the permission to reuse boosters and capsules for crewed flights
For cargo missions they got that permission a while ago, for crew it is new. It is again demonstrating that people learned to trust reused boosters. It's the safer long-term strategy for sure. Would you prefer to fly with an airplane that was never flown before, or one that made several successful flights?
 
  • Like
Likes DrClaude and Klystron

1. What is Crew Dragon Demo-2?

Crew Dragon Demo-2 is a mission by SpaceX, in collaboration with NASA, to launch astronauts to the International Space Station (ISS) using the Crew Dragon spacecraft.

2. When did the launch take place?

The launch took place on May 30, 2020 at 3:22 p.m. EDT from NASA's Kennedy Space Center in Florida.

3. Was the launch successful?

Yes, the launch was successful. The Crew Dragon spacecraft successfully reached orbit and docked with the ISS on May 31, 2020.

4. Who were the astronauts on board the Crew Dragon spacecraft?

The astronauts on board were NASA astronauts Robert Behnken and Douglas Hurley.

5. How long will the astronauts stay on the ISS?

The astronauts are scheduled to stay on the ISS for approximately 110 days before returning to Earth.

Similar threads

  • Aerospace Engineering
6
Replies
183
Views
11K
  • Aerospace Engineering
Replies
12
Views
4K
  • Aerospace Engineering
Replies
2
Views
2K
  • Aerospace Engineering
Replies
3
Views
1K
Replies
1
Views
1K
  • Aerospace Engineering
Replies
4
Views
1K
  • Aerospace Engineering
Replies
9
Views
2K
Replies
4
Views
2K
  • Aerospace Engineering
7
Replies
238
Views
13K
  • Aerospace Engineering
Replies
1
Views
2K
Back
Top