Sökning: "kometer"

Visar resultat 1 - 5 av 8 uppsatser innehållade ordet kometer.

  1. 1. Exocomets in the β Pictoris system

    Kandidat-uppsats, Lunds universitet/Astrofysik; Lunds universitet/Fysiska institutionen

    Författare :Klaudia Jaworska; [2024]
    Nyckelord :Physics and Astronomy;

    Sammanfattning : Comets have been a source of fascination throughout the history of man. In recent years, advances in technology have opened up for the study of extrasolar objects, among them exocomets. The first exocomets were observed in the β Pictoris system almost 50 years ago and the system has been of interest ever since. LÄS MER

  3. 2. Trajectory Optimisation of a Spacecraft Swarm Maximising Gravitational Signal

    Master-uppsats, KTH/Optimeringslära och systemteori

    Författare :Rasmus Maråk; [2023]
    Nyckelord :Spacecraft Swarms; Trajectory Optimisation; Impulsive Manoeuvres; Evolutionary Algorithms; Polyhedral Gravity Model; Small Body Exploration; Discrete Spherical Grids; Svärmande rymdfarkoster; Banoptimering; Impulsiva manövrar; Evolutionära Algoritmer; Polyhedral gravitationsmodell; Utforksning av små kroppar i solsystemet; Diskreta sfäriska rutnät;

    Sammanfattning : Proper modelling of the gravitational fields of irregularly shaped asteroids and comets is an essential yet challenging part of any spacecraft visit and flyby to these bodies. Accurate density representations provide crucial information for proximity missions, which rely heavily on it to design safe and efficient trajectories. LÄS MER

  4. 3. Optical Navigation for Autonomous Approach of Unexplored Small Bodies

    Master-uppsats, KTH/Rymdteknik

    Författare :Jacopo Villa; [2020]
    Nyckelord :Small Bodies; Asteroids; Comets; Autonomy; SLAM; Mapping; Navigation; Orbit Determination; Astrodynamics; Computer Vision; Feature Tracking; Små Kroppar; Asteroider; Kometer; Autonomi; SLAM; Kartläggning; Navigering; Omloppsbestämning; Astrodynamik; Computer Vision; Feature Tracking;

    Sammanfattning : This thesis presents an autonomous vision-based navigation strategy applicable to the approach phase of a small body mission, developed within the Robotics Section at NASA Jet Propulsion Laboratory. Today, the operations performed to approach small planetary bodies are largely dependent on ground support and human decision-making, which demand operational complexity and restrict the spectrum of achievable activities throughout the mission. LÄS MER

  5. 4. Statistical analysis of the electric field measurements from the Rosetta spacecraft in the plasma environment of comet 67P/Churyumov-Gerasimenko

    Master-uppsats, KTH/Rymd- och plasmafysik

    Författare :Guillame Dickeli; [2017]
    Nyckelord :;

    Sammanfattning : Comets are a key to understanding the early stages of the solar system. They were hereat its formation and have not evolved ever since, which means they are our best shotat learning the processes that led to the formation of the solar system as we know ittoday. Yet, our knowledge about these bodies is very limited. LÄS MER

  7. 5. Hur bildades Bushveldkomplexet?

    Kandidat-uppsats, Lunds universitet/Geologiska institutionen

    Författare :Filip Ivarsson; [2015]
    Nyckelord :chromite; intrusion; platinum; LIP; Bushveld Complex; Earth and Environmental Sciences;

    Sammanfattning : The Bushveld complex is the world’s largest mafic intrusion and located on the Archean Kaapvaal craton, southern Africa. The complex’s host rock has anomalous quantities of platinum-group elements (PGE), chromite and other valuable metals of high demand. LÄS MER