Comet ATLAS might not return for another 160,000 years.
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WE WANT TO SIMULATE THE APOLLO MISSION TO THE MOON If we knew the exact date and time for the translunar injection (Hohmann transfer delta-v) from parking orbit, the parking orbit inclination, and the exact delta-v, we could reproduce the mission using SOS (Satellite Orbit Simulator). Of course, it would also be good to have information about the lunar orbit injection delta-v. Let's take it even further: we could also use information about the launch time and azimuth. Can anyone help us (Alan Burgess and myself) gather this information? #space #NASA #Apollo #spaceScience #spaceIndustry #spaceMath #spacePhysics #spaceEducation #spaceFlight #orbit #lunarMission #lunarOrbit #lunarOrbiterMission #ApolloHistory #ApolloData https://lnkd.in/g_54Qps7
Satellite Orbital Simulator
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Exciting progress update on my research so far! 🚀 I've developed a simple numerical solver for a simulator to validate the math behind gravitational assists for spacecraft navigating solar systems beyond our own. In this simulation, I've set up a basic two-body system: a satellite and a star comparable in mass to our Sun. The satellite, a mere 10% of the star's mass, exerts a gravitational pull that dynamically alters the star's trajectory, causing it to whip back and forth around the system's center of mass. At the closest approach, I'm also boosting the satellite's velocity by about ~5% to showcase the Oberth effect, to increase the total energy of the system! On the left, you'll find the inertial frame of reference, while the right shows the center of mass frame, moving along with the two-body system. I hope you enjoyed this small update!
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#PhysicsInHistory @PhysInHistory October 3, 2024 ----- https://lnkd.in/gzAZUkTg ----- #Anatomy of a #BlackHole 1. #EventHorizon : Boundary where the velocity needed to escape the black hole equals light speed. 2. #AccretionDisk : A hot disk of gas orbiting the black hole and its main source of light. 3. #Singularity : A theoretical point at the very center of a black hole where matter is crushed to infinite density. 4. #PhotonSphere : Thin rings of light appearing at the edge of the event horizon shadow. 5. #ParticleJets : Streams of matter moving away from the black hole at nearly the speed of light. ----- #physicsinhistory #lotstolearnfromall #happyweekendtoall #happyoctober2024 ------
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#Comet 2024 G3 (ATLAS), which was first sighted on April 5 of last year by the #Asteroid #Terrestrial-impact Last Alert System (ATLAS) survey, in images obtained with a 0.5-meter (19.7-inch) reflector telescope located in #RioHurtado, Chile. At the time of discovery, the comet was 407 million miles (655 million km) from Earth and shining at an exceedingly faint magnitude of +19. That's roughly 158,000 times dimmer than the faintest star visible to the naked eye.
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'First Searches for Dark Matter with the KM3NeT Telescopes' In a new paper we present limits for neutrino production by Dark Matter annihilation in the Sun and the Galactic Centre. We used the data of early configurations of the ARCA and ORCA detectors of KM3NeT. We tested for different dark matter masses, spanning from a few GeV/c^2 up to 100 TeV/c^2, but did not find a dark matter signal in the data of ARCA from the direction of the Galactic Centre. The result was a limit on the self-annihilation cross section of dark matter into five different Standard Model particles, for the different dark matter masses tested. In the data of ORCA we did not find a dark matter signal from the Sun. In this case, we could set a limit on the cross section of the scattering process between dark matter and nucleons. Read the details in: arxiv.org/abs/2411.10092 #KM3NeT #neutrinos #DarkMatter #ARCA #ORCA In the image: 90% CF upper limits on the thermally-averaged WIMP annihilation cross section as a function of the WIMP mass for the τ +τ − annihilation channel obtained with the data sets from the ARCA8-21 configurations in comparison with results obtained by other experiments.
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Day 9 of #100DaysOfCode: Collision Detection with Stacks! Today, I solved: 1. Asteroid Collision (735): This problem was all about simulating asteroid collisions using a stack. It was fascinating to manage the conditions for when asteroids explode, pass by, or remain. The stack efficiently handled the sequential nature of the collisions. Key Takeaway: Simulations like this reinforce how stacks can manage dynamic, real-time scenarios in problem-solving. Excited for more challenges tomorrow! Any stack simulation problems you recommend? #DSA #LeetCode #100DaysOfCode
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It is my pleasure to share my work: New dynamical system for circular satellites relative motion In this paper, I have constructed a new type of mathematical model to study the dynamics behavior of satellites relative motion
New dynamical system for circular satellites relative motion
sciencedirect.com
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📃Scientific paper: Dynamics of Saturn's Polar Regions Abstract: We analyze data retrieved by the Imaging Science System onboard the Cassini spacecraft to study the horizontal velocity and vorticity fields of Saturn's Polar Regions \(latitudes 60-90$^\circ$N in June-December 2013 and 60-90$^\circ$S in October 2006 and July-December 2008\), including the Northern region where the hexagonal wave is prominent. With the aid of an automated two dimensional correlation algorithm we determine two-dimensional maps of zonal and meridional winds, and deduce vorticity maps. We extract zonal averages of zonal winds, providing wind profiles that reach latitudes as high 89.5$^\circ$ in the south and 89.9$^\circ$ in the north. Wind measurements cover the intense polar cyclonic vortices that reach similar peak velocities of 150 ms-1 at 88.5$^\circ$. The hexagonal wave lies in the core of an intense eastward jet at planetocentric latitude 75.8$^\circ$N with motions that become non-zonal at the hexagonal feature. In the south hemisphere the peak of the eastward jet is located at planetocentric latitude 70.4$^\circ$S. A large anticyclone \(the South Polar Spot, SPS\), similar to the North Polar Spot \(NPS\) observed at the Voyager times \(1980-81\), has been observed in images from April 2008 to January 2009 in the South Polar Region at latitude -66.1$^\circ$ close to the eastward jet. The SPS does not apparently excite a wave on the jet. We analyze the stability of the zonal jets, finding potential instabilities at the flanks of the eastward jets around 7... Continued on ES/IODE ➡️ https://etcse.fr/EiZ4o ------- If you find this interesting, feel free to follow, comment and share. We need your help to enhance our visibility, so that our platform continues to serve you.
Dynamics of Saturn's Polar Regions
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Semi-analytical #attitude propagation for #earth #orbiting objects This paper presents the development of a semi-analytical theory for the long-term propagation of the attitude motion of Earth-orbiting objects with arbitrary shape. The attitude dynamics includes the effects of gravity-gradient, residual magnetic, and light-pressure torques. The equations of motion are expressed in Sadov variables. The equations of motion are averaged over the Sadov angles and the orbital mean anomaly and a combination of Lie transformations is applied to transform from non-averaged to mean attitude variables. It will be shown how this technique can be used to estimate the approximation error and improve the accuracy of the averaged solution. Furthermore, we introduce an alternative set of variables, that removes one of the singularities in the formulation in Sadov variables. The results of the numerical tests demonstrate that the proposed semi-analytical theory, provides a good balance between accuracy and computational cost. Irene Cavallari, Jinglang Feng, Massimiliano Vasile Aerospace Centre of Excellence #debris #space #spacesustainability
Semi-analytical attitude propagation for earth orbiting objects
sciencedirect.com
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New research reveals Pluto captured Charon using a unique 'kiss-and-capture' process, lasting around 10-15 hours. This scenario involved a brief merging of the two bodies before they separated, remaining orbitally linked. This theory challenges known 'hit and run' and 'graze and merge' collision types. #KuiperBelt #Charon #LunarResearch https://lnkd.in/ghD-iQH5
How Pluto captured its largest moon Charon with a 10-hour icy 'kiss'
haywaa.com
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