Questions tagged [orbital-maneuver]

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

Filter by
Sorted by
Tagged with
1
vote
0answers
71 views

I want to go to the moon and then comeback to Earth [closed]

I want to design a mission for which I want to select some samples from the moon, I am new to Orbital mechanics so I need some guidance related to the Mission orbit access plan. How my spacecraft will ...
8
votes
2answers
1k views

How much delta-v does it take to go from one arbitrary orbit to another?

This is, in theory, very basic rocket science. I can't seem to find a solution on here though, so I'm asking in the hopes you'll enlighten me and my amateurish ways. I've got a set of Keplerian ...
1
vote
0answers
36 views

How often are fewer than three astronauts present when moving a Soyuz spacecraft from one docking port to another?

CNN's Astronauts relocated a spacecraft outside the International Space Station (was it inside before?) says: Russian cosmonauts Sergey Ryzhikov and Sergey Kud-Sverchkov, along with NASA astronaut ...
0
votes
0answers
36 views

Orbit design guidelines for rendezvous with ISS?

Are there guidelines for orbit design if you're launching a payload for delivery to the ISS? Altitude, maybe phase angle constraints? Orbital approach maneuvers, maybe? I've figured out how to control ...
5
votes
0answers
67 views

Why (the heck) did Tianwan-1 insert into a low inclination orbit then execute a plane change from 11.8 to 86.9 degrees?

eoPortal's Tianwen-1 (China's first Mars Exploration Mission) shows the following graphic, caption and link. It's often discussed that orbital plane changes are like certain table wines in that they ...
2
votes
2answers
67 views

Oberth Effect in Solar Sails: Where does the extra energy comes from?

Suppose, the reflectors of Solar Sails are opened for same amount of time at both periapsis and apoapsis. How does Oberth effect work in this case? Will Delta-V be same and hence change in Kinetic ...
8
votes
1answer
1k views

This ISS trash deployment looks more like 2 feet than 2 inches per second, was it too fast or are these articles incorrect?

Digital Trends' Watch a NASA astronaut jettison part of the ISS into space which was linked in says: Writing in Air & Space last year about the process of jettisoning objects, veteran NASA ...
2
votes
1answer
73 views

Determining the launch period for Hohmann transfer

How do you determine the day of a specific launch? I know there are launch windows but they only refer to the time at which a spacecraft must be launched. For a LEO it is apparently 365 days, but what ...
3
votes
1answer
136 views

Why did MRO have to “both pitch upward and roll hard to the left” to point exactly at Perseverance during the entry, descent and landing phase?

The HiRise camera on the Mars Reconnaissance Orbiter snapped a beautiful photo of Perseverance falling through the Martian atmosphere hanging from its parachute. This photo is the latest entry in this ...
2
votes
1answer
61 views

GEO Satellite Eccentricity Maneuver

The picture above is eccentricity evolution for one year of a GEO satellite. Based on that eccentricity evolution, I want to do maneuvers to correct the eccentricity. But I have problems, I am ...
3
votes
1answer
101 views

Computing a new TLE following a delta-v impulse?

Is there some code or a library out there that can take orbital elements, add a known delta-v component and then compute a new TLE? I found this one https://apps.dtic.mil/dtic/tr/fulltext/u2/a289281....
2
votes
1answer
157 views

What if we launched rockets from space using the slingshot method and centripetal force? Would that be possible?

Would we have to build a orbiting launch station that uses centripetal force to launch the rockets? Or a station that freely floats through space not in a planets orbit? Would something like this ...
8
votes
1answer
377 views

How can firing a Space Shuttle OMS engine below 21 km cause its nozzle to “collapse”?

This answer to Can the space shuttle use OMS engines during landing? says: No and quotes Section 3.7 of the Orbital Maneuvering System Workbook; OMS 21002 October 10, 2006, Final version, USA006500 ...
14
votes
4answers
4k views

Why is it so hard to build crewed rockets/spacecraft able to reach escape velocity?

Why are we still not going farther than to Low Earth Orbit? Orbital velocity is about 4.8 mi/s (7.7 km/s) and escape velocity is about 7 mi/s (11.2 km/s), about 45% faster. Why is it so hard to reach ...
4
votes
1answer
221 views

Simple alternative to Powered Explicit Guidance for orbital insertion?

Say you're playing space ops engineer and want to simulate an orbital insertion---but you're petrified by the calculations needed to get the coefficients of the linear tangent law behind Powered ...
1
vote
0answers
33 views

Orbital Insertion Altitude for Rendevous with ISS

When SpaceX launches a CRS mission to the ISS, what altitude do they target at orbital insertion? If the ISS is 400 km above ground, do they target 400 km at SECO? Or do they target a lower number---...
2
votes
1answer
101 views

How can you calculate a course based on constant acceleration burn and deceleration burn?

In the TV series The Expanse, a sci-fi space-engine called the "Epstein Fusion Drive" is a thruster capable of performing constant acceleration (up to and beyond "20g" (about $200 ...
1
vote
0answers
25 views

Falcon 9: SECO target altitude/speed?

Is there a typical target altitude and speed for SECO on a Falcon 9 CRS launch? SECO precedes orbital insertion but there are multiple orbital adjustments afterward, so I also wonder: does Dragon have ...
4
votes
1answer
114 views

Could artificial magnets orbiting the sun be used to accelerate spacecraft, like a magnetic “gravity” assist?

Say there's a powerful magnet in an orbit between those of Earth and Mars. Could a spacecraft traveling between those planets save propellant by performing a slingshot maneuver using its magnetic ...
0
votes
0answers
44 views

Using the Clohessy-Wiltshire equation, what would be the expression for ' r '?

I'm looking for an expression for r. The difficulty I'm facing is simplifying the C-W equation
5
votes
0answers
111 views

Why doesn't SpaceX know how long orbital maneuver burns will take?

While listening in on today's Crew Dragon 1 rendezvous, I noticed something interesting: the announced duration for the final coelliptic burn was "25 to 35 seconds". And this wasn't just a ...
4
votes
3answers
91 views

Changes in Orbital Parameters Due to Drag

Other than STK, are there any commercially software packages available to model changes in orbital parameters due to increases/decreases in satellite drag. I am trying to figure out if aerodynamic ...
4
votes
2answers
97 views

Analysing a phasing maneuver using GMAT- how do I reliably quantify their “phase difference”

I am trying to recreate a phasing problem that was solved on paper the previous semester, and verify my solutions using GMAT. Two identical satellites are released on a 550km sun-synchronous orbit by ...
2
votes
2answers
54 views

General Delta V Calculation for Two-Body-Problem

Problem: Given two orbits (e.g. in the 5 keplerian elements excluding true anomaly) A and B calculate the $\Delta v$ necessary to perform a transfer from A to B using instantaneous burns. Simple ...
9
votes
2answers
192 views

How does MEV use its “ion thruster on a stick” technology?

I was reading Politico's Biden’s space policy: One giant leap for climate change and some algorithm embedded a "Learn more about MEV; Northrop Grumman" advertisement in the story. (...
0
votes
2answers
75 views

How to determine the delta V required in order for the satellite at pt. A to hit the earth at pt. B?

I'm confused about how would I go about obtaining delta-v in this case. I'm aware of orbital transfers such as bi-elliptical but that is not the answer to this. Kindly help
1
vote
1answer
125 views

Main reasons for a 2nd burn of a 2nd stage in Earth orbit?

I have seen that sometimes the second stage of a rocket is turned on and off, then after a while turned on and off again. What are the main reasons that second burn of a second state is initiated ...
1
vote
1answer
189 views

STK 11.2: perform a low-thrust optimal transfer

I'm using STK 11.2 to find a minimum-time finite transfer between two coplanar orbits. The first orbit is circular and has a radius 7000km, the second orbit has a <...
6
votes
1answer
303 views

Tools for low-thrust trajectory optimization

I'm performing a transfer between Near-Earth orbits considering J2 perturbation with the low-thrust engine. Orbital parameters: ...
2
votes
2answers
177 views

Maneuver in the intersection of 2 orbits

The spacecraft transfers between two co-planar orbits. The initial orbit has the Ra = 2000km, Rp = 600km and ...
4
votes
1answer
172 views

Convert the impulsive solution to a low-thrust

The spacecraft transfers from an orbit with the following parameters: Perigee - 700 km Apogee - 6000 km Inclination - 64 deg Argument of perigee - 250 deg to and orbit with the parameters: Perigee -...
4
votes
1answer
84 views

Optimization of low-thrust in-plane maneuver

I have to build an optimal trajectory between two orbits, which are in one plane, but with different semi-major axis, argument of perigee and eccentricity. I've read different articles regarding the ...
5
votes
1answer
58 views

Does the short-angle solution of Lambert's Method break down for very Delta-V intensive maneuvers?

Just a (hopefully) quick qualitative question that I'm having a bit of trouble extracting from the literature: I've implemented a universal-variables Lambert's method in python, and it has been ...
2
votes
1answer
147 views

Mathematics behind attitude maneuver

I found a paper that says: "Let's take the task of modifying the orientation of a 700kg mass spacecraft along one of it's principal axes ; a 5 deg rotation is to be performed. It is assumed that ...
15
votes
4answers
4k views

Why is it most efficient to change orbit inclination while crossing the equator?

At T+26:31 into the SpaceX ANASIS-II Mission Livestream, the host mentions that the mission trajectory calls for an orbital inclination change which is performed when the orbit of the second stage and ...
2
votes
0answers
36 views

Why will it take a couple of weeks to complete CRYOSAT 2's orbit raising of a few hundred meters?

The BBC's Esa and Nasa line up satellites to measure Antarctic sea-ice says: Authorisation was given on Tuesday for Europe's Cryosat-2 spacecraft to raise its orbit by just under one kilometre. This ...
0
votes
1answer
96 views

Why are ICESAT-2 and CRYOSAT 2 both at inclinations of almost exactly 92 degrees?

The BBC's Esa and Nasa line up satellites to measure Antarctic sea-ice says: Authorisation was given on Tuesday for Europe's Cryosat-2 spacecraft to raise its orbit by just under one kilometre. This ...
4
votes
1answer
210 views

Get dates when a satellite has performed maneuver from historical TLE data (python)?

I have been recently acquainted with orbital mechanics and am trying to do some analysis on the subject. Since I don't have subject matter expertise, I am at a crossroads with trying to decide that ...
2
votes
2answers
132 views

Low-thrust space tugs

For my research in the field of orbital maneuvers I consider the orbital transfers with space tugs. For the high-thrust maneuvers I used the parameters of Fregat and Volga space tugs. However, for low-...
6
votes
2answers
841 views

Orbital Rendezvous vs Hohmann Transfer

Let's assume that a spaceship (capsule) is about to dock to the ISS the distance between spaceship (capsule) and ISS is 20 meters the relative velocity between the spaceship (capsule) and ISS is ...
4
votes
1answer
735 views

What happens to orbit after a radial burn?

We know from Hohmann-Transfer or bi elliptic transfer maneuvers that a burn in the tangential direction of an orbit changes the radius of the orbit. But what happens to an object in orbit, when there ...
3
votes
1answer
127 views

How do Starlink trains spread into separate orbits with equidistant orbital slots?

Starlink satellites are launched in batches of 60. They are released from the launch vehicle, and then have to spread out – not only into equidistant slots along a single orbit ring, but now ...
3
votes
1answer
107 views

When doing an interplanetary Hohmann transfer, are additional escape and capture burns necessary in addition to the two Hohmann Transfer burns?

When doing a Hohmann transfer, it takes a burn to change from a low orbit to the Hohmann Transfer Orbit (HTO), and a second burn to change from the HTO to a high orbit. I know how to find the delta-v ...
8
votes
1answer
1k views

Why the long (19 hour) mission profile for SpaceX's trip to ISS?

As mentioned briefly in this question, The Russian Soyuz has been using a sub-4 hour path to ISS. Why the long ride from Canaveral? Or is the 19-hour timeframe typical of all launches prior to the "...
0
votes
0answers
51 views

How to calculate the wait time for Venus to Earth?

I am trying to calculate the minimum time needed for a return trip to Venus. I have calculated the time taken for the Hohmann transfers to Venus and I need to find the wait time until the return trip ...
5
votes
0answers
168 views

What exactly is a solar gravity well manouver and in what cases would it be helpful?

In this answer to the gedankenexperiment question With current state of technology if we wanted how long would it take for newly launched probe to overtake Voyagers? I've seen the term "solar gravity ...
5
votes
1answer
89 views

How much thrust is “high” thrust (for orbital transfers)

I understand that chemical rockets and nuclear thermal rockets (and possibly very high power electrical thrusters) are considered to provide "high" thrust for orbital transfers, while electrical ...
8
votes
1answer
432 views

What do the shaded vertical lines in the animation of Gravity assists of space probes, mean?

Example Animations from Wikipedia — https://en.wikipedia.org/wiki/Gravity_assist#/media/File:Animation_of_Voyager_1_trajectory.gif https://en.wikipedia.org/wiki/File:...
9
votes
1answer
851 views

When things land on Mars what fraction of their velocity do they remove propulsively?

Some recent comments have got me wondering about this What is the distance between one of the mars's satellite revolving near the highest volcano olympus mons and the volcano olympus mons? comments ...
5
votes
1answer
291 views

Station Keeping East-West Maneuver

A GEO satellite spends 14 days in longitude deadband (+/-0.067 deg). At the 14th day, I want to perform an east-west maneuver. But I am uncertain what time I should perform the maneuver at the 14th ...

1
2 3 4 5
7