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Questions tagged [orbit]

Questions regarding an object 'falling around' another object, due to a combination of gravity and momentum.

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What if a component of a binary star lies in the center of it's orbit and not in the focus?

I'm trying to solve this task: Observing a visual binary star with a highly elongated elliptical orbit for a long time, the astronomer noticed that the bright component lies in the center of the ...
ALiCe P.'s user avatar
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3 votes
2 answers
1k views

Is it possible for a planet to heat up its moon to habitable temperatures solely through infrared radiation?

Stars are powered by nuclear fusion and the energy released radiates through their surface as heat. But all objects radiate away some form of electromagnetic radiation depending on their temperature. ...
user177107's user avatar
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12 votes
2 answers
3k views

Is Jupiter warming the Earth? (Earth, Sun Jupiter system)

If Sun-Jupiter baricentre is outside the Sun, does that mean the Sun is orbiting around that point too right? Then the Sun shouldn't be nearer to the Earth at some point during the Sun-Jupiter orbit (...
Enrique's user avatar
  • 267
14 votes
4 answers
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Can a satellite stay in one place but not above equator? [closed]

I know that there are geostationary satellites that are always seen in one place in the sky and that they all are located in the equatorial area. I wonder if it's possible for a satellite to "...
ALiCe P.'s user avatar
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5 votes
1 answer
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Are there automatic methods to locate (stellar and supermassive) black holes?

Black holes have been discovered using several techniques, as outlined by How are black holes found?. What I was wondering is: are there automatic methods for locating them (e.g., artificial ...
nicolopinci's user avatar
3 votes
1 answer
338 views

Best way to procedurally generate an orbit given mass and eccentricity

As stated here, I've badly expressed my problem and have made what we call a XY problem (the question was well answered nonetheless) so I restate the question. Sorry for the inconvenience I have a 2D ...
Eol's user avatar
  • 75
4 votes
2 answers
468 views

Given mass, position and eccentricity, is there a way to get initial velocity in a 2-body problem?

I know that the we can get the eccentricity vector like that: $\mathbf{e} = \frac{\mathbf{v} \times \mathbf{h}}{\mu} - \frac{\mathbf{r}}{\|\mathbf{r}\|}$ (source: https://astronomy.stackexchange.com/...
Eol's user avatar
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2 votes
2 answers
524 views

Are the major-axis of Mars and Earth orbits on the same plane?

Which means that I can draw an imaginary plane that contains the major-axis of both Earth and Mars.
LIdbioe's user avatar
  • 51
2 votes
2 answers
175 views

Do all the orbits of planets in the Solar system fit in a (imaginary) cone?

So that all the elliptic orbits can be seen as slices from the cone while the sun is a shared focus.
LIdbioe's user avatar
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2 votes
0 answers
330 views

What's the formula for change in argument of periapsis over time due to J2 perturbations for a geocentric satellite?

I'm trying to propagate the orbit of the ISS, but it became very clear to me very quickly that the J2 perturbations were nothing to scoff at. A quick google search gave me the equation for the change ...
Martin Leung's user avatar
1 vote
3 answers
279 views

Why doesn't the Moon fall out of orbit?

If you need to boost ISS to stay in orbit why moon doesn't fall down to earth and KABOOM?
user42450's user avatar
1 vote
0 answers
564 views

Is there a formula for a planet's orbit in a 3D space?

I'm trying to model the orbits of Earth and Mars and their positions at a given point in time. But I can only find 2D equations of elliptic orbits, which only contain the x and y variables. I have to ...
LIdbioe's user avatar
  • 51
5 votes
2 answers
772 views

How to calculate eclipses on a planet in a binary star system

I posted this question on the physics page but decided it might be best if I post it here instead as it may be a more astronomy related question. I also haven't received any answers over there so far ...
Linus's user avatar
  • 53
2 votes
1 answer
95 views

The Sun's motion around the galaxy [duplicate]

As the Sun orbits the Milky Way, I understand that it also moves up and down through the plane of the Galaxy. How long does this movement take and can we tell where we are in the current cycle.
user36138's user avatar
  • 171
13 votes
3 answers
5k views

Is the barycenter of the solar system usually outside of the sun?

I came across this picture on wikipedia: Note: From a quick search I gathered that although there are slight differences between the limb of the sun and the accepted radius of the sun, these ...
eps's user avatar
  • 241
3 votes
1 answer
439 views

Are we able to accurately predict planetary orbits over a longer period of time?

I was wondering whether planetary orbits can be predicted with our classical theories, or whether quantum randomness comes into play making the unpredictable in the long run?
Raheemsterling's user avatar
3 votes
1 answer
344 views

Is the 'spin' of Earth and the 'spin' of Mars a significant contribution to their angular momentum?

Is the 'spin' of Earth and the 'spin' of Mars taken into account as a contribution to the conservation of angular momentum? (and a contribution to the increasing/decreasing eccentricity?) Or - is the ...
Rob Clennell's user avatar
0 votes
1 answer
223 views

When will Mercury have rotated an extra round around its axis?

It is well known that Mercury orbits slightly differently from a pure Newtonian orbit. Every year a slight deviation is found. Now if we observe a lot of these orbits then Mercury should at one point ...
Deschele Schilder's user avatar
7 votes
1 answer
513 views

Degrees of freedom in restricted circular coplanar three body problem

How many degrees of freedom does a mechanical system consisting of three bodies, the Sun, Jupiter and an asteroid, have in the restricted circular coplanar problem of the three bodies? I know that if ...
Augustin's user avatar
  • 153
2 votes
0 answers
91 views

Orbital resonance 2:1

I considered the motion of an asteroid around the sun, in a $2:1$ orbital resonance with Jupiter. Following the study of this resonance, it was observed that the angle between the major axis of the ...
Augustin's user avatar
  • 153
6 votes
2 answers
7k views

Can someone explain to me the TEME reference frame in defining orbital coordinates?

I am undertaking a project of developing a "surface station" for my desktop, which will track the position of different satellites as they fly overhead. I have zero background in ...
werdnerd's user avatar
2 votes
2 answers
3k views

Can we see the south Pole of the Moon standing on North Pole of the Earth

As the Moon's orbit is inclined to Earth's Equator and radius of earth is only 6350Km but Moon is 385000Km away, we should be able to see the south pole of the Moon from below- i.e standing on North ...
Mohan Mone's user avatar
0 votes
2 answers
112 views

Why collisions between earth orbiting satelites do occur?

According to Kepler laws all earth orbiting satellites should have the same velocity. So how can they collide?
JCRCAN's user avatar
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0 votes
0 answers
167 views

2-body orbits expanding in nbody simulation?

Recently, I designed an n-body engine and tested it with a binary star system. After a minute of running, the orbit began noticeably expanding: Why is it happening, and is this natural? The source ...
WarpPrime's user avatar
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1 vote
0 answers
244 views

Calculating Angle Between Two Planets In Heliocentric Orbit

My goal is to calculate the retrograde of Mercury. What I've been working from is the book, Practical Astronomy With Your Calculator 3rd edition. I've made some progress, but I seem to be stuck with ...
Misfit's user avatar
  • 11
0 votes
0 answers
64 views

Wrong planet orbit

I would like to calculate Mercury's orbit in Mathematica. My initial conditions, in AU and AU/year, are: ...
Mark8991's user avatar
11 votes
2 answers
4k views

What is the difference between the two terms named "Eccentricity" and "Ellipticity"?

I don't get the difference between the two terms named "Eccentricity" and "Ellipticity", especially, in astronomy. I understand eccentricity as a measure of the curvature of a ...
Tafhimul Hasan's user avatar
2 votes
0 answers
117 views

Planets orbit fitting

I would like to fit planets orbits. To do this, I need a set of mock observations. I can get them from right ascension/declination obtained from the Horizons interface: EDIT: Horizons gives me a list ...
Orion's user avatar
  • 21
4 votes
1 answer
144 views

Where can I find a list of retrograde Milky Way stars?

I read in papers that the Milky Way contains some retrograde stars (retrograde to the Milky Way rotation). Does anybody know where I can find a list of them, possibly including data on their distance ...
magnolia1's user avatar
3 votes
1 answer
68 views

What is the longitude of the winter solstice for the various planets?

I am looking for data showing the longitude at which the various planets in the solar system reach their winter solstice. Where could I find this data?
magnolia1's user avatar
1 vote
0 answers
99 views

What is the period of the 'cycle' of Earth's ecliptic variation, relative to the 'invariable plane'? 70,000 or 100,000 years?

The plane of Earth's path around the Sun, the ecliptic, is different from the average of the solar system's as a whole (the invariable plane) by about 1.57°.... Our path around the Sun, though, goes ...
Kurt Hikes's user avatar
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9 votes
3 answers
463 views

Asteroids conjunction

I am currently writing a C++ program to show asteroids in 3D, and find close approaches or collisions. I got my orbital elements from JPL https://ssd.jpl.nasa.gov/sbdb_query.cgi. So far so good, with ...
Tiblemont's user avatar
  • 399
20 votes
2 answers
2k views

Is S2 still the fastest known star in the galaxy?

Wikipedia's entry for the star S2 says that it has the fastest known ballistic orbit, reaching speeds exceeding 5,000 km/s (11,000,000 mph, or ​1⁄60 the speed of light) and acceleration of about 1.5 ...
Connor Garcia's user avatar
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0 votes
1 answer
91 views

Orbit of Luhman 16?

I am studying some binary stars and brown dwarfs. Some orbits are known and easy to find, like Alpha Centauri. However, when I look for the orbital characteristics of Luhman 16 (AB), I only get the ...
WarpPrime's user avatar
  • 6,683
12 votes
2 answers
1k views

What is the longest natural bound orbit chain observed?

Define a bound orbit chain as a list of successively less massive bodies, each in a bound orbit with the bodies preceding it in the list. Then an example of a bound orbit chain would be: <Sun, ...
Connor Garcia's user avatar
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7 votes
1 answer
1k views

How to find the shape of an orbit

What is the minimum information I need to be able to draw the shape of an orbit of a body that orbits the sun? With this information how can I figure out the shape of its orbit?
Bartley's user avatar
  • 173
2 votes
1 answer
129 views

How can I find the width of an orbit knowing some values?

I need to find the width/x-radius of an orbit, which is ellipse shaped, knowing variables like the orbit's length(perihelion + aphelion in this case) and the eccentricity. I am not sure if this is ...
nekiwo's user avatar
  • 23
4 votes
3 answers
1k views

Computing the rate of orbital decay

We know that the estimated time until a binary system merges is given by: $$\dfrac{5c^5r^4}{256G^3(m_1m_2)(m_1+m_2)}$$ But what is the formula to determine rate of decay, in some sort of distance unit,...
WarpPrime's user avatar
  • 6,683
5 votes
2 answers
1k views

What is the thickness of the Solar System disk?

What is the thickness in AU of the all planets' orbital plane height combined in the Solar System? Excluding Pluto. Looking for h
Majoris's user avatar
  • 545
2 votes
1 answer
87 views

Prograde to retrograde orbital path

Is there a planet or planetary moon flyby path that could send a solar prograde orbiting asteroid into a retrograde solar orbit?
Connor Garcia's user avatar
  • 16.3k
-4 votes
2 answers
89 views

What makes a star? [closed]

What are the properties of a star? How do astronomers classify the properties of stars?
ariana grande's user avatar
3 votes
2 answers
136 views

Do moons experience periods of no sunlight when orbiting "behind" their planet?

I'm writing a story that takes place on the Saturn moon Iapetusand I was thinking that especially since Iapetus only has an inclination of about 17 degrees from the ecliptic, wouldn't there be a point ...
morningknight's user avatar
1 vote
0 answers
56 views

Visual binary star with circular apparent orbit

Does anyone know a good example of visual (or interferometric) binary star apparent orbit of which looks circular due to projection though in fact is markedly elliptical? I need that for teaching.
Leos Ondra's user avatar
  • 1,074
6 votes
1 answer
138 views

Fate of a planet orbiting a Lagrange point behind a star?

Let's say there is a planet orbiting at L5 behind a star, which is in turn orbiting a more massive star, like so: What is the ultimate fate of this planet? I'm predicting that it will spiral into the ...
slowerthanstopped's user avatar
18 votes
6 answers
7k views

If the Sun disappeared, could some planets form a new orbital system?

If the sun were to suddenly disappear, the planets would continue to travel tangentially to their former orbits. (This I know from this answer to a somewhat related question here.) In such a scenario, ...
Psychonaut's user avatar
3 votes
1 answer
885 views

How long before Phobos reaches the Roche limit of Mars?

Phobos orbits really close to Mars, so close that one Phobos period is shorter than one sol. Due to tidal friction, it is also getting closer and closer to Mars. How much time will it take before ...
usernumber's user avatar
  • 17.6k
2 votes
1 answer
267 views

Scholarly work on the gravitational disruption of a rocky planet by a close pass with another planet?

note: While the apparently abandoned question Effects of a rogue planet passing between the Earth and the Moon? (inspired by Thundarr the Barbarian) asks for speculation and was answered with it, this ...
Roger Wood's user avatar
  • 1,359
4 votes
2 answers
303 views

What are the Time Zones on Mercury?

I normally post on worldbuilding, but this question is merely about facts of a planets orbit and spin. I am trying to figure out how time periods work on Mercury to possibly make a worldbuilding guide ...
skout's user avatar
  • 309
1 vote
0 answers
96 views

Do the orbits of planets change? Where is the data for this?

Everything in the space is moving all the time. Do the orbit of major Solar Systems planets, Mercury to Saturn change? Just like Moon's orbit around Earth changes. How often, how small or big is the ...
Majoris's user avatar
  • 545
10 votes
1 answer
426 views

How can orbital resonance sometimes have a stabilising effect, whilst other times, it has a destabilising effect?

I have just started learning about orbital resonance. I understand how bodies in orbital resonance will line up according to the orbital ratio number, and there will be increased gravitational effects ...
Matthew H's user avatar
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