# Questions tagged [orbital-maneuver]

In spaceflight, an orbital maneuver is the use of propulsion systems to change the orbit of a spacecraft.

189 questions
62 views

### Would a Mars flyby be possible on a transfer orbit from Saturn's moon of Titan to Earth?

So, I am trying to calculate whether a transfer burn from Saturn's moon of Titan to Earth would involve a Mars flyby, assuming I have the burn start on 2 March, 2025 and arrival on 19 March, 2031. ...
180 views

### How do I calculate the delta-v with patched conics?

I am trying to calculate the delta-v between Kerbin and Duna from a 70 km circular orbit around Kerbin just to do a flyby of Duna. However, I am running into a couple of difficulties with my ...
398 views

### Improvements to script for Finite Burn Trajectory Optimization with MATLAB

I've written a MATLAB script to use the bvp4c two point boundary equation solver to implement a Calculus of Variations trajectory optimization of the problem of a single finite burn with a free coast ...
641 views

### How do multiple satellites deployed in the same launch reach their different final orbits?

For example on the Iridium-4 launch from SpaceX on 22-12-2017, 10 satellites are deployed almost at the same time. How do the satellites go into their own separate orbits after they are deployed? When ...
138 views

### Specific kind of orbital transfer?

What do you call the kind of transfer that takes an orbiting body from orbiting the planet of the system to orbiting a moon of the system. I am merely looking for the name of this kind of transfer ...
197 views

### Why are electrodynamic tethers not used to propel payloads beyond LEO?

Bringing spacecraft to higher orbits than LEO is quite expensive and as rocket reusability gains traction, it will probably get even more expensive when compared to a standard LEO deployment since the ...
454 views

### Best time to perform an orbital inclination change — during ascent, or once in circular LEO?

Given that the $\Delta V$ required to perform an orbital inclination change is proportional to velocity, I was wondering when the best time to perform such a maneuver would be. Would it be best to ...
121 views

### Apollo 11 CSM spacecraft orbit

How long would it take to orbit the earth at a medium altitude (with equation). I need a equation that would help me figure out how long it would take to orbit at that altitude.
593 views

### What happens to JWST after it runs out of propellant?

JWST will be orbiting L2 which is unstable equilibrium thus will require propellant for station keeping. JWST will carry propellant for 5-10 years. What will happen once it runs out of propellant? ...
323 views

### Design of an elliptical transfer orbit

I was working an example in Charles Brown's "Elements of Spacecraft Design" but I can not figure out how the Time of Flight was calculated. Here is the problem Example 6.5. I got the correct answer ...
120 views

### Fuel-optimal thrust profile for an orbital ascent on a planet with an atmosphere

This is a continuation of a previous question posted a few months ago. If we consider a SSTO vehicle launching from a planet with an atmosphere, would it be fuel optimal to have a period of lowered ...
474 views

### Traveling in a circle while in orbit

What is required for a satellite to remain positioned 400 km above the north pole, thus allowing it to appear essentially stationary relative to the surface of the earth? Could this best be achieved ...
328 views

### Injection versus insertion

I've noticed that maneuvers to leave a body's sphere of influence on the way to another body are invariably referred to as injection maneuvers, for instance, translunar injection, while maneuvers to ...
684 views

### Lowest delta-v maneuver to reverse the direction of a satellite in LEO?

Part of this answer was inspired if I remember correctly from a question about how to reverse the direction of a satellite in LEO with the minimum delta-v. Whether this was the original question or ...
133 views

### What inclination change could the 5th stage Orion 38 motor provide ORS-5 (SensorSat)?

The screen shot and block quote below are from Oribal ATK's Mission Update: Minotaur IV ORS-5 Launch. ORS-5 or "SensorSat" is a technology demonstration for a class of satellites that will sit in LEO ...
122 views

### Where can I find this Space Shuttle Memo?

T. J. Fill, “PEG Prediction Corrections,” Shuttle Memo 10E-80-11, The Charles Stark Draper Laboratory, Inc., Cambridge, MA, March 1980. And this isn't a request to violate copyright, if that's an ...
220 views

### How to optimize time of ignition for an on-orbit burn and/or coast phase on ascent?

I've been playing around linear tangent based guidance laws (specifically the old Atlas-Centaur Surveyor guidance, Apollo IGM and Space Shuttle PEG code) and while PEG has an option for a coast phase ...
300 views

### Why do delta-v and delta-v both use the same term?

As noted in this Wikipedia article, delta-v, used in spacecraft flight dynamics, is a measure of the impulse that is needed to perform a maneuver. However, in general physics (a much longer standing ...
392 views

### ISS achieving lift by using it's solar panels

Can the ISS achieve any lift by using it's solar panels as 'wings' against the sparse atmosphere? My understand is they started moving the solar panels into a 'low drag' orientation when on the ...
372 views

### How are multiple low orbit communication satellites per launch distributed along an orbital plane for global coverage?

SpaceX talks about launching 4,425 communication satellites into 83 different orbital planes at 1,100 km altitude. That's about 50 satellites per orbital plane. In terms of capacity to LEO, a Falcon 9 ...
455 views

### Inclination change maneuver [duplicate]

I'm making a spacecraft maneuver from one orbit to another. Firstly, I'm going to change the inclination, therefore, moving to a coplanar orbit. Where is it better to change the inclination, in ...
899 views

### Lambert's problem solution: optimal transfer time

I'm solving the Lambert's problem, and already have written a program, which solves the BVP using Shooting method and computes ...
429 views

### Multiple solutions to Lambert's problem

I'm solving the Lambert's problem, and already have written a program, which solves the BVP and computes the velocities required to transfer from one point to another in a given time. However, I ...
366 views

### Could Phobos be brought closer to Mars?

Because Phobos has always the same face turned toward Mars, an electric propulsion system could be placed there to slow down the orbital speed. But what would be the energy needed to supply the force ...
170 views

### The delta V required for given cordinates intersection on given time

The spacecraft is on a LEO orbit with known keplerian elements. The equation of motion for spacecraft is also known. I have to intersect (just intersect!) the given coordinates $X$, $Y$, $Z$ on near, ...
139 views

### Optimal time and coordinates of intersection of a spacecraft with an object on orbit

Spacecraft and an object are rotating on orbit. The spacecraft is controlled via the velocity vector change, may change its velocity to intersect another object. Needed to find the time and ...
283 views

### The relationship between the altitude of an anti-radial burn on apogee

I recently conducted an experiment using Kerbal Space Program to analyze the effect of burn altitude on orbital properties. Unfortunately im a bit of a rookie when it comes to orbital dynamics so I'd ...
997 views

### How do orbital boosts affect the structural integrity of the ISS?

I've become curious of this question since my time on KSP, and searches have not rendered much. In the simulator, building large stations even without the micro atmosphere being simulated, can cause ...
282 views

### Why did STS-32 require 11 major firings of Columbia's maneuvering engines?

I was reading the Mission Safety Evaluation Report for STS-32 and I noticed the following passage: The STS-32 rendezvous was one of the most complex the Space Shuttle had ever attempted, ...
132 views

### Cassini: difference between trajectory and orbital trim maneuvers in this list?

I found this site with quite a substantial amount of data, tabulations, and more for many space exploration missions. There are detailed information on the Cassini mission here: http://www.dmuller....
297 views

### Orbit Maneuvering

I am working on a project of simulating orbit maneuvering. I have interfaced SGP4 with my current simulation code, however I realized that the orbit maneuvering cannot be done using SGP4. I am aware ...
1k views

### Optimal change of argument of periapsis?

If I want to rotate an eccentric orbit around the central body - retain orbital plane, retain apoapsis and periapsis altitudes, but have the orbit rotated in its orbital plane - change the argument of ...
314 views

### Oberth Effect for non-tangential acceleration

Due to the Oberth Effect, it is most efficient to accelerate a spacecraft along its orbit at or as close-as-possible-to periapsis, and decelerate within close proximity to apoapsis. But all ...
231 views

### Are transfers between two orbits commutative?

Are the propellant mass and transfer time from orbit A to orbit B the same as from orbit B to orbit A, considering low-thrust propulsion? That is, in the case of dealing with Keplerian orbit ...
350 views

### How many orbits will it take for Santa to deliver all the presents?

This year Santa has decided to try a new strategy to deliver presents which he hopes will require less physics-defying magic, since magic is in short supply these days. Instead of personally flying ...
321 views

### Unravelling Cassini's “ball of yarn” orbit around Saturn, tabulation of propulsive maneuvers?

The cool GIF on the NASA JPL Cassini resources page All Orbits (2004-2017): The Ball of Yarn is quite beautiful to look at, but it also hints at some beautiful engineering and orbital mechanics as ...
351 views

### What is the closest intentional separation achieved by two satellites?

I would like to know what is the closest separation achieved by two satellites. Let's restrict it to Non experimental satellites (or else it would be 0) Operational satellites (no collision) Post ...
375 views

### Is Cassini's 183rd burn; some kind of engine record?

I've just read that when Cassini makes its first close pass of Saturn's F-ring on December 4, it will be the 183rd engine burn which sounds like a lot for orbital maneuvers using a spacecraft's main ...
233 views

### JPL Horizons original reference orbit data for Juno - how to retrieve now that it's been updated?

Because of the slow helium valve responses, Juno was not instructed to execute the large delta-v maneuver to drop from the ~53 day orbit to the ~14 day orbit originally scheduled for 2016-Oct-19. I'd ...
439 views

### Inclination change to Geostationary Orbit

How is inclination change performed for satellites inserted into GEO? With most launches performed from spaceports at various high latitudes, it's impossible to launch directly into equatorial ...
212 views

### Save energy in plane changing orbital maneuver

I just read about Cassini's upcoming orbital maneuvers where there's a nice animation showing Cassini's orbits. Here's a frame of the animation: I see a lot of plane changes, i.e. the probe's orbital ...
629 views

### Is 45 km unusually close to pass the ISS and deploy a microsatellite without warning?

Eight years ago, on September 27, 2008, the Shenzhou-7 carying three taikonauts deployed the microsatellite Banxing-1 for testing maneuvers and external imaging. A few hours later at 15:07 UTC the ...
266 views

### CZ-5 plus YZ-2 put SJ-17 in GEO - third stage or separate spacecraft?

CZ-5 = Long March 5 YZ-2 = Yuanzheng 2 SJ-17 = Shijian 17 Gunter's Space Page says: SJ 17 (Shijian 17) is a Chinese experimental satellite flown on the maiden CZ-5/YZ2 launch. It is ...
179 views

### Broken plane manoeuvre

Reading about orbital manoeuvres, I found a few reference to the "Broken Plane Manoeuvre". One illustration describes it: Source: http://hopsblog-hop.blogspot.jp/2013/01/deboning-porkchop-plot.html ...
215 views

### Why would Juno's originally planned orbit lowering partially mitigate radiation damage?

I'm trying to understand where Juno will pick up most of the slow, cumulative radiation damage within it's orbit. Currently it is in the higher, 53 day orbit. The original plan was that tomorrow (...
217 views

### Is the analysis of this maneuver correct?

Can someone out there help explain (guide, give examples etc.), or show a solution of, the following textbook problem that I can't manage to solve? You’ve just completed an analysis of where the ...
128 views

### How to know when JPL Horizons is updated with new Juno spacecraft trajectory?

I "watched" Juno's flyby of Jupiter using the simulation in the NASA's Eyes app on my laptop, and later saw the good news in this tweet. Now I want to do a "flyby in Python". Using the setup (shown ...
73 views

### Saturn's Pan and Prometheus orbital resonance

Is it possible for a small object (such as a manned capsule) to realize a maneuver using the orbital resonance influence of Saturn's moons Pan and Prometheus?