Questions tagged [landing]
Questions regarding the specific part of flights, during which a spacecraft touches down on the solid ground of a celestial body.
330
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Why did the communication cable of the Perseverance rover make an angle so great with the other three cables? [closed]
How can you explain the weird position of the communication cable in the image below?
The Perseverance about 20 meters above the surface of Mars. The communication cable, between the rover and its ...
3
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1answer
118 views
How many spacecraft bounced like a ball on Mars? How many tried to?
The answer to Why a rover bounces after landing on Mars? is "the Mars Exploration Rovers" of which there were two.
However, they might not be the only spacecraft to use bouncing like a ball ...
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3answers
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A mysterious flash of light on the surface of Mars while the Perseverance rover was landing. What can it be? [closed]
A mysterious light that lasted a fraction of a second appeared on the surface of Mars while the Perseverance rover was descending. What can its source be?
See: Perseverance Rover’s Descent and ...
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4answers
403 views
The Mars parachute opened against a black sky on Earth but a blue-magenta sky on Mars during Perseverance landing. How is it possible? [closed]
I have discovered two images (see below) and I do not find an explanation for the different color of the sky as seen from below the parachute just starting to deploy. The video with the test performed ...
56
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4answers
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How were Perseverance's cables “cut” after touching down?
In the NASA conference today regarding Perseverance's successful landing on Mars, they talked about how you can see the cable that held the rover in this picture below (I circled the cable).
I'm ...
6
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0answers
53 views
What are the rules for callouts during mission landings?
I remember hearing at one point that in the control room at JPL, only the GN&C Lead is allowed to make the announcement for touchdown. It's because they don't want someone prematurely (and ...
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0answers
127 views
Has any spacecraft attempted to land on Mars without an ablative-type heat shield?
My answer to Do exploration spacecraft enter Mars atmosphere against Mars rotation, or on the same direction? lauds the use of ablative heat shields for minimizing radiative heating of a spacecraft by ...
6
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2answers
400 views
How tall are the “cliffs of the delta” in the Perseverance rover's landing ellipse?
edit: For all the cliff-doubters in comments, here's a quote of Project Scientist Ken Farley in the new NASA video After the Landing: An Update about NASA’s Perseverance Mars Rover after ...
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7answers
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Why not land SpaceX's Starship like a plane?
I get the reasoning behind designing Starship to land upright. It doesn't require landing gear and the turnaround is expected to be much faster. But I'm beginning to question that logic.
I think the ...
15
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1answer
1k views
Are launch windows to Mars avoided if they result in landings during dust storm season?
This comment suggests that orbit before descent to Mars' surface allows a mission to delay the landing if the weather conditions are bad. I think that Tianwen-1 will be the first to put a lander rover ...
5
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1answer
148 views
SpaceX Starship: Could they use the Vacuum engines during landing in case of other engine failure?
With the recent test (and RUD due to single engine relight failure) of SN-9, Musk has stated that what they should've done was light all three raptor engines simultaneously then turn one off so as to ...
1
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1answer
96 views
How long is Falcon 9 suicide burn?
My question is
How long is a Falcon 9 suicide burn?
I assume the answer might vary between rides, depending on the payload lifted and its destination orbit so the time might not be the same for a ...
6
votes
1answer
148 views
What is the heaviest object to have been returned to Earth with a parachute?
Per What were the biggest and heaviest spacecrafts to safely return from orbit?, the biggest and heaviest spacecrafts to safely return from orbit were space shuttles and space planes.
What were the ...
8
votes
1answer
434 views
Can the space shuttle use OMS engines during landing?
Can the space shuttle use its OMS engines if the shuttle is short during the runway approach? Is fuel available for use in such a situation and will the engines provide reasonable thrust to get to the ...
4
votes
1answer
185 views
Starship deceleration during belly flop?
Was just wondering what level of deceleration did they get during that belly flop manouver?
Updated:
Hiya, you're all correct, and I was a tad vague in my question! What I'm after is the vertical ...
4
votes
2answers
159 views
How was an emergency landing site at Diego Garcia used during the Apollo program?
On the current Starlink mission as the 2nd stage passed over the Indian Ocean I heard mention of contact with a ground station at Diego Garcia. Checking that article I found the subsection Space ...
3
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0answers
44 views
How to get MSL coordinates during EDL from SPICE kernel?
Upon trying to extract MSL position above surface by decoding a SPICE kernel, I am gettin this error:
At epoch 3.9750216818313E+08 TDB (2012 AUG 06 05:16:08.183 TDB), there
is insufficient ...
1
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0answers
16 views
Falcon 9 Stage 1 Guidance After Separation?
Does anyone know how stage 1 of Falcon 9 is guided immediately after stage separation?
I'm not interested at this point in getting it to a precise landing spot, nor am I interested in the landing ...
4
votes
1answer
76 views
Does the SpaceX Falcon 9 first stage fleet, fly in order?
SpaceX by the end of 2020, made it very clear that they have solved the first stage reflight problem. Two cores have flown 7 times. Several are over 4 flights. At the beginning of 2021 they have about ...
2
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2answers
234 views
Can the Space Shuttle land on Mars assuming there is a paved surface for landing?
Can the Space Shuttle land on Mars if it had a paved runway?
Can the Space Shuttle use aerobraking and will its control surfaces provide attitude control?
Can the parachute and braking systems stop ...
3
votes
1answer
85 views
Besides landing several folks on the Moon and returning them safely to the Earth what criteria did Human Landing System proposals to NASA meet?
The new NASA video NASA 2021: Let's Go to the Moon shows artwork for three very different spacecraft sitting on the lunar surface with the overlain caption
Selecting A Human Landing System
"...
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1answer
81 views
Can Starship use dedicated smaller auxiliary landing fuel tanks?
Would it be better for Starship to have a separate set of small fuel tanks dedicated to landing the ship, maybe controlled separately or plumbed differently.
7
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1answer
97 views
Is there possible engine damage without launch platform on Mars return flight?
When a Starship has landed on Mars, there is not going to be any kind of prepared platform initially. (That may be a task for early crews to resolve).
Is there the possibility that Starship, sitting ...
6
votes
2answers
711 views
How many burns does New Shepard have during a descent?
The Falcon 9 first stage is making two or three burns for descending:
boostback burn (optional, depends on return to launch site vs ocean landing)
entry burn
landing burn
But how many burns is the ...
11
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2answers
2k views
Land a cubesat on the moon with ion engine
Say I have a 3U cubesat with a BIT-3 ion thruster, an iodine tank and landing legs. Can it land on the Moon with just an ion thruster?
4
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0answers
158 views
How heavy is SpaceX's Octagrabber?
SpaceX's drone ships have a vehicle that drives under a booster after landing and then clamps onto it to secure it. Photos of it suggest that it has neither ballast nor any way to clamp onto the ...
4
votes
1answer
180 views
Can the grid fins affect the rotation of the Falcon 9 descent?
Can the grid fins control the rotation of the Falcon 9 on descent?
How would they have to be positioned to stop the rotation?
If used to rotate the ship, then how they would they have to be positioned ...
2
votes
0answers
97 views
Could SN8 miss its “bellyflop” if Center of Gravity is too far forward?
Very excited about the upcoming Space X Starship SN8 test flight, but was concerned about the ability to perform the high drag horizontal belly flop with some of the rocket thruster hardware missing ...
21
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5answers
4k views
Which astronauts or cosmonauts were injured by a hard landing?
Sigmund Jähn, the first German in orbit, was injured during a hard landing of the Soyuz 29 capsule on September 3rd, 1978. He got permanent damages of his vertebral column.
Are there other astronauts ...
13
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3answers
4k views
Did Apollo have braking rockets for soft landing on Earth?
Did Apollo have braking rockets for soft landing on Earth? I have checked Google but cannot find an answer.
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1answer
84 views
How long it takes for the Falcon 9 payload fairings to reach the sea?
The payload fairings of Falcon 9 are released at about 3:15 min
How much time they need to fall and reach the sea?
And what is their maximum speed while reentry?
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1answer
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Falcon 9 landing stages
I know the first stage of Falcon 9 separates at about 2:30 min and it lands at about 8:30 min
But what are the distinct stages of the descent? Like deorbit burns, grid fin deployment, leg deployment ...
2
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0answers
48 views
What is the splash down speed of the manned dragon capsule?
What's the rated speed of the crewed dragon capsule? Do we have any data on the actual measurement for the demo mission?
I'd also appreciate any info on speed for Soyuz, other soviet manned, Apollo, ...
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3answers
153 views
Are Falcon 9 1st stages now always landed at sea?
Does the first stage of Falcon 9 now always land on a drone ships at sea?
Say since 2016 or so.
5
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2answers
140 views
Could Crew Dragon Make an Emergency Landing on Land?
Could a capsule designed for ocean splashdown still land successfully on land in an emergency? The speed of the capsule is slowed to ~15 MPH, which seemingly wouldn't destroy the capsule.
18
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4answers
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Is there a risk that re-entering capsules or other components will hit ships or islands?
How precisely can the splash-down point of re-entering capsules (from Mercury onwards) be known in advance? Wasn't there a risk that capsules would hit a ship or an island?
Likewise, Russian and ...
3
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1answer
103 views
What are the main stages of a Crew Dragon descent?
From answers to How much time it takes for the capsules to descend from ISS back down to Earth? I understand it takes 19 hours from the undocking from ISS until it touches the land.
But what are the ...
5
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0answers
56 views
Engine configuration for lander
Which is a more stable lander design:
1.Single central engine.
2.Multiple engines located near the corners
Following is the design for Tianwen-1, the Chinese Mars lander:
And following is the design ...
2
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0answers
103 views
What are the challenges for delivering bulk asteroid commodities to Earth? [closed]
I think nickel-iron is an extraordinary and perhaps unique resource that is (by Earth market standards) valuable even as a raw and unprocessed commodity - perhaps several thousand US$ per ton for high ...
5
votes
1answer
92 views
Do the ASDS barges have mission specific equipment?
End of June 2020, there was a planned Starlink (L9) mission on Jun 26, and OCISLY (Of Course I Still Love You, name of the vessel, really! Not making that up!) went out catch the stage.
Then a few ...
10
votes
1answer
486 views
How close to a building has a Soyuz landed?
Soyuz capsules are designed to land onto land. To avoid the small chance of harming people or property, they are usually targeted to land in remote parts of Kazakhstan. However, some landings aren't ...
3
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0answers
112 views
Space-X Falcon-9 and Falcon Heavy fuel consumed for landing
The question is, how much fuel is used by each of above rockets for landing (in % of whole fuel of the rocket) as a function of three following components - payload, orbit and descend trajectory (land/...
11
votes
1answer
266 views
What caused STS-129's low energy condition on the HAC?
I've never heard anyone comment on the trouble STS-129 seemed to experience during the Heading Alignment Cone (HAC) phase. I was hoping someone who was involved with the program might know why it ...
5
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3answers
402 views
How does SpaceX Falcon 9 keep balance while it is near to the landing site?
As we know, flight vehicles can't keep balance easily if they cannot propel enough air through their blades or wings. We can also see the Falcon 9 at a steeper angle a while before touching down on ...
5
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0answers
120 views
Is it legal to sail near a Falcon-9 landing at sea?
Is it legal to pilot a sailboat near any of the autonomous spaceport drone ships?
For example, is it possible to stay near "Of Course I Still Love You" during the first stage landing?
12
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3answers
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Is Crew Dragon flawed? Is it just an improvisation with no future?
I know that, Crew Dragon was initially designed for vertical landing on solid surfaces, as a reusable spacecraft, and then some changes were made to make it capable of landing in water using ...
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2answers
160 views
Why are we still giving medical support to astronauts after they land? Or any support for that matter?
Besides moving the astronauts around, what are the medical team needed for? I assume they are already wearing some type of monitors for heart/breathing/etc. A call on the radio can confirm if they are ...
3
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0answers
79 views
Atmospheric entry of asteroid mining products
This is a more general question than How to get processed asteroid metals back to Earth in a safe manner
That question was actually a quick check to see if a particular idea was plausible. Instead, ...
5
votes
1answer
148 views
What specific event determined the “end” of a shuttle mission?
We've had several questions about when a mission officially "begins". But what about when a mission officially "ends"?
The Apollo Flight Journal stops the mission clock at splashdown. What was the ...
2
votes
1answer
64 views
At what altitude(s) were the Viking BLDT rockets fired?
I'm trying to understand the details of the 1972 Viking BLDT test missions (in earth's atmosphere). I found this diagram in a book and the general description that the (four) BLDT (balloon drop) tests ...
