Questions tagged [prediction]

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Predicting the ground path of a satellite's shadow

Given the orbital parameters of a satellite, how can I predict the ground path of its shadow? (The path from where it will appear to transit the Sun).
LostXOR's user avatar
  • 73
12 votes
4 answers

Have any bits of a space mission ever collided with a planet or large moon (not Earth) that was not a target of the mission?

For example, a mission to Mars for which some bit of hardware ended up entering Venus's atmosphere. Has this ever happened, or at least are there projections that it may happen?
Starship - On Strike's user avatar
5 votes
1 answer

How can uncertainty about the position of an object decrease over time?

The Near-Earth Objects Coordination Centre predicts future close approaches with Earth, for example these approaches for 2010RF12. For example, the time uncertainty of the 2022-09-23 closest approach ...
prosfilaes's user avatar
0 votes
0 answers

How to calculate future true anomaly for hyperbolic trajectory? Did I make a mistake in my calculations?

I'm trying to calculate future spacecraft's position and velocity at time t. I need to calculate the true anomaly at time t for this. I've already made it for the elliptic orbits and it is working ...
Robotex's user avatar
  • 604
3 votes
1 answer

Do reentering capsules always make a(n Earth-shattering ka-)boom and look like a fireball if at night? Time & epicenter predictable w/ public info?

SpaceX enjoys press. So the unexpected events popping up in the news is good for them. March 26, 2021: Fire ball burning over Woodland WA- SpaceX second stage re-entry and burn up. A ‘spectacular’ ...
uhoh's user avatar
  • 149k
2 votes
1 answer

Finding the new true anomaly after performing a maneuver

Given a standard set of orbital elements (angular momentum, semi-major axis, eccentricity, inclination, longitude of the ascending node, argument of periapsis, and true anomaly), and a global time ...
mecha_moonboy's user avatar
2 votes
0 answers

General rule for predicting Kessler syndrome

Let's say that we have a gradient for density of orbiting bodies by altitude. And we also have their relative size dispersion. Is there any general rule (or preferably a neat formula) for predicting ...
Krumuvecis's user avatar
5 votes
2 answers

Sun-synchronous satellite orbit propagation

I'm trying to propagate the orbit of a sun-synchronous satellite. The initial data is defined by the TLE. The orbit of the satellite is controlled by the operator ...
Tarlan Mammadzada's user avatar
6 votes
0 answers

Any algorithmic models of our solar system to predict positions relative to earth?

I'm looking for a map/model of the movements of our solar system and associated moons. What are the 'best' algorythmic models to represent our solar system. Looking to write a game/edutainment app ...
CodingMatters's user avatar
6 votes
3 answers

How can a solar storm be predicted?

Satellites like DSCOVR are used to predict solar storms. How does that work? If the satellite is orbiting L1 and "watches" the sun, how can the signal be back on earth before a storm arrives? How ...
mike's user avatar
  • 1,636
3 votes
2 answers

How do you compare a simulation with a fitted orbit?

I am very confused with regards the simulation and fitting of satellite orbits. For example, how does one compare the results of a numerically integrated force model with an orbit that has been ...
Rumplestillskin's user avatar
5 votes
2 answers

Is the utility PREDICT good enough for operational orbital prediction?

I'm looking for a cheap and cheerful, but ultimately working utility or library for tracking a cubesat and predicting link windows. I've been looking at using Orekit. I'm a student, so a lot of its ...
Walkingbeard's user avatar
6 votes
1 answer

What theories is Juno expected to confirm?

According to the Wikipedia article on Juno, the data that Juno returns will sift through multiple competing theories for Jupiter's formation. However the more theories that one has, the more likely ...
Strategy Thinker's user avatar
19 votes
2 answers

How accurately (maximum possible accuracy) can future satellite positions be predicted?

Agencies/organizations who own/operate satellites want to know their future positions after a certain amount of time. We know that models of satellite dynamics are imperfect and also perturbations ...
James C's user avatar
  • 1,931
12 votes
1 answer

How does SGP4 work?

For calculating orbital state vectors of satellites, SGP4 (simplified perturbations model) is often used in conjunction with two-line element sets to calculate future positions of orbiting objects. ...
Stu's user avatar
  • 5,928
13 votes
1 answer

How accurate are modern ephemerides, and how does their accuracy degrade over time?

I was reading about what is involved in making an ephemeris and wondered about this. Feeling I'd read pieces that extrapolated orbits over many thousands of years, I looked for an example and found ...
kim holder's user avatar
  • 21.4k