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Questions tagged [payload-deployment]

Questions about the process of a launcher releasing its payload and the positioning and configuration of that payload

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How to confirm payload fairing seperation

How do launch providers confirm fairing separation? I know they have a video feed, but I assume there's a more reliable (short delay) means of detecting separation. Is it as simple as a limit switch?
Phillip Gyasi - Agyei's user avatar
4 votes
1 answer
280 views

What is the significance of a heat flux value of 1135 W/m^2 when jettisoning the payload fairing? [duplicate]

I have seen that many rockets jettison their payload fairing at an altitude where the aerothermal heatflux is leass than or equal to 1135 W/m^2. What is the reason behind considering this particular ...
Tejaswi's user avatar
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2 votes
0 answers
99 views

6U , 12U Deployer / Dispenser, helpful criteria we might use for selection?

as a member of a group of students that builds 6U and 12U Cubesats for different projects I am interested in knowing the average cost of a 6U and a 12U deployer. Also, beyond cost, what are some other ...
RDGroup's user avatar
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2 votes
0 answers
70 views

Looking for C02 cartridge specifications, for 16g and 32g canisters. Looking to find some for deployment use both in both Australia and USA

I am looking for C02 canister specifications, for 16g and 32g cartridges. Looking to find some for deployment use both in both Australia and USA. We have brought many 16g and 32 g cartridges, but are ...
Rocketman's user avatar
2 votes
1 answer
125 views

Will Cygnus do anything special when it "looses its NACHOS"?

CBS News' NASA's new "NACHOS" instrument could help predict volcanic eruptions explains that this nanosatellite will be deployed from the Cygnus spacecraft launched February 19, 2022 after ...
uhoh's user avatar
  • 149k
3 votes
0 answers
80 views

Info needed on PSLV launch adaptors and configurations

I want to understand how satellites are accommodated in PSLV. I know about few configurations and adaptors that've been used in the past. Is there any document which gives detailed info on Multiple ...
Suyash's user avatar
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1 vote
0 answers
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How does a fusible wire deployment mechanism work?

Situation Me and my student team are considering to use fusible wires in our CanSat to control the parachute and payload deployment. In detail, a mechanism using a fusible wire should release a loaded ...
Caeleste's user avatar
  • 131
3 votes
2 answers
104 views

What is final positioning of rideshare satellites (like transporter-2 mission) and how do they get there?

Looking at deployment of transporter-2 mission I did not see any information about the final position of these satellites (relative to the second stage or to each other) and how do they get there (...
Piro's user avatar
  • 133
7 votes
2 answers
417 views

When jettisoning heavy objects from the ISS e.g. 2.9 tons of batteries+, how much angular impulse does the station get? Corrective actions necessary?

Discussion below this answer to Why does it take so long for ISS garbage to fall out of orbit? addresses the jettisoning of the ~2.9 ton pallet full of used batteries full of nickel and other things. ...
uhoh's user avatar
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How do cubesat owners first find out their cubesat's initial trajectory? How do they point antennas at it before official TLEs start to appear?

When cubesats are first deployed it can sometimes take several days before they start appearing in official TLE distributions, and even then if many were deployed it may take a lot more work to decide ...
uhoh's user avatar
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Timeline of record multiple satellite launches

The Transporter 1 mission has placed 143 satellites into low orbit in one go. The previous record was held by the Indian ISRO PSLV C37 mission with 104 satellites in 2017. Where can I find a complete ...
Ginasius's user avatar
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7 votes
1 answer
219 views

Why do rockets coast before secondary payload deployment?

I was watching a falcon 9 launch. After SECO, stable orbit was achieved and the primary payload was deployed. The 2nd stage coasted for an hour (no burns in between) and then deployed rideshare ...
Ashvin's user avatar
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5 votes
0 answers
139 views

Why did Tianwen-1 payload separate upside down?

China recently launched its Mars exploration mission Tianwen-1. Separation of the payload from the second (or third?) stage can be seen in a post-launch news clip. In this clip, the computer animation ...
nialv7's user avatar
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Are spacecraft put into Earth orbit frequently equipped with small thrusters to separate their orbits from their co-orbiting rocket bodies?

Brandon Rhodes' retweet says I’ve recently followed @TSKelso as a fun way to keep up with the surprising volume of rocket launches these days, and the new https://celestrak.org viewer shown here is ...
uhoh's user avatar
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7 votes
0 answers
116 views

Do deployments of multiple cubesats generally obey proposed guidelines such as 20 seconds or more between deployments at 5 m/s or faster?

This answer to What can be done in future mass-cubesat deploys to make them “less irksome” to orbital space debris experts? links to Space Traffic Safety: A New Self-Governance Approach for the ...
uhoh's user avatar
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3 votes
1 answer
467 views

What are the needle pins that go through the pneumatic pushers of the Falcon 9 fairing?

The Falcon 9 fairing uses four pneumatic pushers to impart a positive separation force between the fairing halves. The pushers all mount on half of the fairing and push against the other half. But ...
user avatar
1 vote
1 answer
147 views

How will NASA's TROPICS cubesats be inserted into their three orbital planes and proper phasings?

Rocket to launch 8 cubesat to LEO at an equidistant distance reminded me that I'd never asked this question. NASA's TROPICS 3U cubesat constellation hasn't been launched yet, so there's still time to ...
uhoh's user avatar
  • 149k
3 votes
1 answer
297 views

How many spacecraft deployed from the ISS have escaped Earth orbit? Are there plans for any in the near future?

After reading Why did the Ulysses probe reach Jupiter much faster than Galileo? and answers to How many Space Shuttle payloads ended up beyond Earth orbit? and also What's the largest rocket that was ...
uhoh's user avatar
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4 votes
3 answers
201 views

Redeployable solar arrays. Do they exist? or are they being worked on?

Has it ever been done, or is anyone working on, redeployable solar arrays? In other words, a solar cell array that can be deployed in space, used for a period, and then folded up again into the ship, ...
Johnny Robinson's user avatar
2 votes
0 answers
122 views

Were there problems for "NASA’S ICON satellite"? Did PG&E shut off UC Berkeley's Space Sciences Laboratory's power?

The San Jose Mercury News article How PG&E’s power shutdown threatened a NASA mission describes a last minute rush to obtain extension cords, generators, and access to backup fuel when it was ...
uhoh's user avatar
  • 149k
7 votes
1 answer
1k views

Orbital insertion accuracy for SpaceX payloads

What is the orbital insertion accuracy of SpaceX for positioning its payload (for example satellites)? How close do they get to the requested or target orbital parameters? I tried to research this on ...
Åke's user avatar
  • 71
3 votes
3 answers
507 views

Why does the Falcon 9 launch heavier payload in LEO than Ariane V and the other way around for GTO?

Browsing a comparison of orbital launch systems on wikipedia, I notice that launcher capable of launching payload in GTO can launch in GTO approximately all the mass of the payload they can launch in ...
Manu H's user avatar
  • 3,790
8 votes
2 answers
398 views

Why does the F9 second stage roll back and forth during deployment of each RADARSAT satellite?

GIF Watching the SpaceX video RADARSAT Constellation Mission after T+ 52:00 we can see at least the first two satellites deploy. In each case, the second stage ...
uhoh's user avatar
  • 149k
3 votes
0 answers
47 views

Is there video from the Falcon second stage of the Dragon solar panels deploying?

We get video from the second stage of the Dragon leaving the second stage. And we get video from the Dragon of its solar panels deploying. But a cool view would be of the Dragon's solar panels ...
mor's user avatar
  • 39
5 votes
1 answer
295 views

help understanding this complicated structure that will deploy HySIS

This ISRO page for the HysYS spacecraft says: HysIS, the primary satellite of PSLV-C43 mission, weighing about 380 kg, is an earth observation satellite configured around ISRO’s Mini Satellite-2 (...
uhoh's user avatar
  • 149k
3 votes
1 answer
292 views

What can be done in future mass-cubesat deploys to make them "less irksome" to orbital space debris experts?

In the first group of questions below the block quotes, I've illustrated situations where a large number of cubesats are deployed at one launch (56 an 104 satellites) and it seemed to take quite a ...
uhoh's user avatar
  • 149k
3 votes
1 answer
387 views

What is this "space ring"? Is it SHERPA or something new, or just "art"?

In the orbitalreflector.com website there is a picture of a ring that looks like it can deploy smallsats as part of a more complex launch. Reverse image search turns up another view, both shown below. ...
uhoh's user avatar
  • 149k
3 votes
1 answer
328 views

Are the cubesats deployed from the ISS always directed "nadir and retrograde"?

@Tristan's answer to What are the orbital mechanical consideration behind hand-launched nanosatellites from the ISS? includes: If you launch nadir and retrograde, you will put the object into a ...
uhoh's user avatar
  • 149k
4 votes
1 answer
245 views

Typical time for a cubesat to start up after it is deployed

How long do cubesat take to start up completely after they are deployed? I know the cubesat standard requires 30 minutes after initial separation from the launcher to deploy deployables such as ...
Nathan's user avatar
  • 143
7 votes
1 answer
237 views

How was it difficult for the PSLV to launch a record of 104 satellites?

Last year, ISRO launched 104 satellites successfully into orbit. People praised it as an 'astounding achievement'. Besides a more complicated-than-usual satellite deployment, what truly was ...
user avatar
19 votes
2 answers
861 views

What was the outcome of the launch of ZUMA by SpaceX, to the best of the public's knowledge?

Now, I realise this question is inherently unanswerable due to the classified nature of the mission, and speculation is also not desirable, but that's okay — because we can at least assemble official ...
marked-down's user avatar
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9 votes
1 answer
426 views

Have there been individual satellites that have been deployed and recovered more than twice?

Have there been individual satellites that have been deployed into Earth orbit (or beyond) and recovered safely back to Earth's surface more than twice? Deployed means it's not a launch vehicle ...
uhoh's user avatar
  • 149k
7 votes
1 answer
682 views

What are the orbital mechanical consideration behind hand-launched nanosatellites from the ISS?

The NASA Spaceflight article Extended Russian EVA complete – conducts satellite deployments says: The first order of the day was for Ryazanskiy to head into the manual deployment of five ...
uhoh's user avatar
  • 149k
6 votes
0 answers
254 views

Why isn't the JWST mirror bigger?

What's behind the choice of not designing the largest possible folding mirror for the James Webb space telescope, since something like a 13m diameter mirror could also fit in Ariane's fairing?
user avatar
5 votes
1 answer
397 views

ISRO's PSLV-C37 with 104 satellites - after 56 hours only six TLEs, which factor is greatest challenge?

It's been 24 hours 56 hours since ISRO's PSLV-C37 launched from Satish Dhawan Space Centre (SRI) at 09:28 local time (03:58 UTC). I see satcat numbers and object names for 105 total objects; ...
uhoh's user avatar
  • 149k
7 votes
2 answers
414 views

Why would the future Nanoracks airlock be built so that it must be removed from the ISS to deploy cubesats?

I am sure there are a number of safety and engineering considerations, as well as future integration and flexibility to consider, but I can't think of any so far. When I think of an airlock, I think ...
uhoh's user avatar
  • 149k
5 votes
2 answers
816 views

What is the final conclusion about 'object M'? What happened?

I've looked at Is Iridium launch object M a test satellite? and I don't understand what seems to have happened. The Iridium launch produced 11 orbiting objects when only 10 Iridium satellites were ...
uhoh's user avatar
  • 149k
8 votes
1 answer
275 views

What goes into the planning and execution of the deployment of groups of LEO satellites?

I was among many watching SpaceX's exciting OrbComm-2 mission (Falcon-9 Flight 20, 22-Dec-2015), and besides the first successful landing of a 1st stage after an orbital mission, the deployment of the ...
uhoh's user avatar
  • 149k
5 votes
1 answer
1k views

How were the 10 Iridium NEXT satellites deployed by SpaceX?

Can someone explain (in general or specific terms) how SpaceX deployed these 10 satellites? I'm trying to imagine the mechanisms and process of launching these objects with the required precision. Is ...
spring's user avatar
  • 151
5 votes
1 answer
458 views

What pattern of satellite release will the pentagonal Iridium arrangement use?

The first ten of eleven OrbComm satellites were deployed in opposing pairs at five different times. The 2nd stage performed roll maneuvers to make sure the initial velocity and/or attitude were ...
uhoh's user avatar
  • 149k
2 votes
5 answers
1k views

Can a blimp dead drop on Mars or Earth this way?

I saw a space jump where someone had exceeded the speed of sound before the air slowed him down enough to deploy a parachute, because the air was not dense enough to tear him apart in the upper ...
Muze's user avatar
  • 1
12 votes
3 answers
2k views

What kinds of things have been tossed out of the ISS?

Cubesats are (ir-)regularly deployed at very low velocity from the ISS, and they don't usually have propulsion. This tells me that the delta-v is enough to guarantee to those in charge that their ...
uhoh's user avatar
  • 149k
12 votes
2 answers
2k views

Are cubesats deployed with fully discharged batteries? Even those on Sherpa?

I'm pretty sure that at least some large satellites are deployed with their batteries charged so that they can initialize themselves, get their own attitude and position, and possibly establish some ...
uhoh's user avatar
  • 149k
2 votes
1 answer
952 views

How will Sherpa and Formosat-5 be configured as payload and launched?

I was reading the comments in this Reddit and I'm confused. How will Sherpa and Formosat-5 be configured inside the Fairing, and then deployed. One comment seems to suggest that Formosat-5 is one of ...
uhoh's user avatar
  • 149k
7 votes
0 answers
377 views

What caused this shadow on Falcon 9 stage 2 w/Jason-3 before circularization burn?

While the image appears bright, the light is just reflected sunlight (from the earth, per the webcast). The circularization burn doesn't start until about T+ 00:55:16 per the SpaceX webcast. But at ...
uhoh's user avatar
  • 149k
4 votes
1 answer
216 views

Are these objects other satellites in the SpaceX webcast of Jason-3 deployment?

I realize there is a whole lot of stuff in low earth orbit, but didn't imagine that it would be so visible. Here are the two brighter objects that passed by during the deployment of Jason-3 by SpaceX. ...
uhoh's user avatar
  • 149k
2 votes
1 answer
442 views

DId the Falcon 2nd stage turn around [UPDATED] and point "backwards" before the Orbcomm-2 deployement started?

It looks to me like the camera used for the deployment part of the Webcast shown on YouTube is located near the "bottom" of the payload area (closer to the engine & tanks) - in which case, did ...
uhoh's user avatar
  • 149k
17 votes
2 answers
3k views

How did Falcon 9 deploy 11 satellites?

Falcon 9 Flight 20 has successfully deployed 11 ORBCOMM satellites into orbit. I can easily imagine a rocket deploying 1 or 2 satellites. But how did Falcon deploy 11 satellites in a single flight? ...
James C's user avatar
  • 1,921
18 votes
1 answer
1k views

What was the distant bright light in the SpaceX webcast of Orbcomm OG2 deployment?

As I was watching the SpaceX launch today on YouTube, I have noticed a bright distant light as the satellites were being deployed. What was that light? Also, after each deployment there was something ...
KingsInnerSoul's user avatar
7 votes
1 answer
635 views

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 ...
LocalFluff's user avatar