# Questions tagged [deorbit]

The tag has no usage guidance.

18 questions
Filter by
Sorted by
Tagged with
359 views

### How do I calculate re-entry velocity when decaying from a circular orbit?

I am trying to find the velocity of an object during re-entry so that I can calculate the peak heat flux but I'm a bit stuck. I know how to find the velocity of the original, circular orbit (300km) ...
102 views

### Can you accurately control the reentry point by deorbiting with ion propulsion?

With decaying orbits, the point of reentry depends heavily on solar activity, and is very hard to predict or control. When there are things that could survive reentry and potentially be harmful, or ...
41 views

### Second derivative of mean motion as indicator of deorbit

I noticed that the second derivative of mean motion (SDMM) is non-zero for only a small percentage of the NORAD catalog. All those objects I checked have reentered since the TLEs I was using were ...
304 views

### Circular to elliptical orbit delta V requirements

this might be a dumb question, but i've been recently trying to calculate the delta V to deorbit a satellite, and I've run into a problem. Assuming a 400km circular starting orbit(and disregarding ...
105 views

### What fraction of Terminator Tape™'s drag comes from interaction with Earth's magnetic field as a function of altitude? Is it ever important?

This answer states that Terminator Tape™ uses the Earth's magnetic field to generate drag to shorten the deorbit time of a spacecraft in LEO. It links to https://sst-soa.arc.nasa.gov/12-passive-...
162 views

### Why is “Terminator Tape” electrically conductive?

A 230 foot long tape deployed from the satellite Prox-1 greatly reduced how long it took to deorbit. The tape was described as electrically conductive. Was that property intended to help the ...
226 views

### Most fuel-efficient deorbit from geostationary

Say a spacecraft in geostationary orbit needs to be deorbited (not very common, but bear with me). How does one decide when and how long should the retrograde burns be, in order to have started with ...
1k views

### Is SpaceX propulsively deorbiting a Starlink satellite already?

The plot below shows that most of the SpaceX Starlink satellites have moved from circa 450 km to circa 550 kilometers already, using their argon-based ion engines. A few, along with four unidentified ...
55 views

### Would it be possible to de-orbit a small object by throwing it with human strength? [duplicate]

If an astronaut went on a spacewalk (say from the ISS), tethered him/herself to a relatively massive object in orbit around the earth (say the ISS), and threw a small object in the direction opposite ...
153 views

### Would Mayak's large solar reflector have produced a stable attitude, or more likely start tumbling or rotating?

update: Answers to Two week mark; has Mayak (Маяк) been spotted yet? Reflector deployed? Astronomy “ruined”? indicate that the reflector did not deploy successfully (more at Mayak, a magnitude -10 (...
91 views

### Could a Soyuz-MS deorbit after a failure of its deorbit engine?

The scenario: A Soyuz-MS spacecraft is on-orbit and ready for its deorbit burn. The crew then discover that there is a fault in the propulsion system and the deorbit engine can't fire. The craft is ...
228 views

### Why did the MESSENGER probe get deorbited?

I have heard a bit about why interplanetary probes get deorbited, but that was about Jupiter and Saturn that have potentially life-friendly moons. But regarding Mercury, no life could exist there: the ...
177 views

### Where to stream online Tiangong 1 descent?

Are there going to be good free live streams of the descent and if so is there much to be seen anyway?
30k views

### Why does the ISS have to be destroyed?

ISS might be destroyed soon, de-orbiting for a controlled reentry into the Pacific Ocean. Why isn't simply pushed away from Earth to an outer stable orbit (not sure if it's possible) or even into an ...
399 views

### For a given amount of fuel, what is the best de-orbit profile for the ISS?

Reading this question, what is the best way to make sure most of ISS (or any other large object planned to be destroyed in the atmosphere) will burn and break into relatively small pieces in the ...
8k views

### Why would extra fuel be needed to de-orbit the ISS (if it comes to that)?

The BBC article The Astronaut Fighting to Save our Home in Space discusses “experienced astronaut, and astrophysicist Dr Michael Foale”'s exciting career aboard the Space Shuttle, Soyuz, Mir, and ISS, ...