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Questions tagged [atlas-v]

Atlas V is an expendable launch system in the Atlas rocket family.

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On large diameter Atlas V fairings, why is the Centaur inside the fairing?

When including an image in an answer to this question: Was New Horizons launched on a copper rocket? I noticed that for the larger diameter fairings (Atlas 501 and up) the Centaur upper stage is ...
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What is the Oxidiser/Fuel Ratio of the Atlas V Centaur Upper Stage?

I can't find this information anywhere for the single or double engine variant. could it be variable? Or is it a secret?
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What happened to the Atlas IV?

I was recently reading up on the Atlas rocket family, and I noticed that for some reason the numbering went from the Atlas 3 straight to the Atlas 5. Why did they skip number 4? I am familiar enough ...
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InSight Launch - Centaur Fuel Rich

During the launch of InSight today one thing sprung out to me: at T+408s the voiceover announces: Centaur slightly fuel rich. And again at ...
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532 views

Is it feasible to launch NASA's InSight mission Mars using a Falcon 9, instead of an Atlas V rocket?

The Insight mission is launching the spacecraft to Mars on May 5th aboard the Atlas V rocket by ULA. Would it have been possible to launch this mission using a SpaceX Falcon 9 Block 3/4/5 (expendable ...
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Why can't Falcon Heavy accelerate deep space payloads as fast as Atlas V and Delta Heavy?

A Falcon Heavy with an expendable core costs $95M and lifts 2.5x as much to GTO as the Atlas V. It's Pluto injection orbit payload is nearly half of the Atlas V's GTO payload. In the answer to this ...
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How much will Europa Clipper weigh?

I realize that NASA will have to change Europa Clipper's loadout based on whether they are launching on the SLS 1b or the Atlas 5 backup, but does anyone know what those two mission masses will be, ...
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What is the source of the 'whoop' sound made before the liftoff (T-3s) of Atlas-V rocket?

For reference, you can hear the distinct 'whoop' sound at T minus 3 seconds mark of the recent TDRS-M launch. This sound has been distinctive for most previous Atlas-V launches as far as I can ...
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What are these 'Lego' plates inside the Atlas 5 fairing? [duplicate]

My local engineering newspaper has an article on the X-37B craft, with an image displaying the craft within half of the shell that encapsulates it. The shell has a number of plates arranged on its ...
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842 views

Why are some rockets orange?

After many successful launches with the Delta II, ULA made the Delta IV rocket orange. What's the reason for this strange color change? Also the Atlas V's first stage is orange, is there any ...
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979 views

How does Atlas V maintain stable flight with asymmetric solid rocket boosters?

While watching a launch of an Atlas V, I couldn't help but notice that the boosters were positioned asymmetrically. There was one booster on one side of the rocket, and two boosters on the other side. ...
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Why was OSIRIS-REx almost destroyed because of a loss of pressure following the SpaceX “fast fire”?

In the news item on the website of ABC's affiliate station WFTV in Florida Official: SpaceX explosion nearly destroyed asteroid-seeking OSIRIS-REx spacecraft, there is discussion of a loss of pressure ...
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Why do the shapes of these two exhaust plumes from an Atlas V 411 look different?

The Atlas V 411 configuration is interesting because there is a single SRB on one side of the first stage, requiring the main engines to vector substantially to keep the thrust mostly axial. The ...
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What is the meaning of “BODA”?

What is the meaning of the acronym BODA as used in an Atlas V launch, specifically the Juno launch in 2011?
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What are the advantages of Delta IV over Atlas V

I have read many times that the Delta IV is more expensive to launch than the Atlas V. Outside of the Delta IV Heavy configuration, which is in a class by itself for certain payloads and missions, are ...
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Were composite materials used on Soyuz and on Atlas launchers?

I would like to know if composite materials were used on Soyuz and Atlas launchers but I can't find a lot on the web. I also would like to know which components of other launchers are made of ...
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What does the US Govt get out of its Assured Access funding of ULA?

ULA gets a so called subsidy (currently purported to be $800 million a year, since it is being considered to be cancelled) for Assured Access to space. Their lack of a bid on the GPS3 launch contract ...
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Technical reasons for Delta 4 medium phase out

This news item quotes Elon Musk as saying it would make sense for the government to rely on ULA's Delta 4 and the SpaceX Falcon 9, phasing out the venerable Atlas 5. "You don't need both of ...
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What's the thickness and weight of rocket tanks?

I found it quite fascinating that the Shuttle External Tank was as thin as 2.5mm. That seems very thin for a structure over 40 meters tall and weighing as much as 760 000kg fueled. I'm curious how ...
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Why does Atlas V have so many different types of payload fairings?

So I was curious about why the Atlas V rocket has so many versions, with three-digit designators like "401" and "551". The obvious differentiator is the number of solid rocket boosters you can add to ...
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What was the thrust-to-weight ratio during liftoff of the Atlas V OA-4 launch?

It seemed to me that today's (Dec. 6, 2015) launch of ULA's Atlas V carrying Orbital ATK's Cygnus spacecraft in orbit and towards the International Space Station on the OA-4 mission had a particularly ...
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How do the secondary payload abilities of different launchers compare?

ULA with their Atlas V seems to be the leading launch service provider for secondary payloads. This FISO presentation is convincing anyway. And good for them since miniaturization of satellites ...
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What is the object protruding from the left side of the payload fairing during ULA Atlas V 501 AFSPC-5 launch?

OK, What is it? I have not noticed it on previous launches. It's also visible in AFSPC-5 launch videos, for example in this one: And it also comes into view ...
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What was RD-180 used in, before Atlas III/V?

At NasaSpaceFlight.com, Chris Gerbhart writes: The RD-180 has provided exceptional performance to the Atlas V and was chosen to be the engine of the first stage in no small part because of its ...