Tag

Orbital Dynamics

All articles tagged with #orbital dynamics

space10 days ago•11 min saved

Discarded asteroid data hints at a 153-day Earth-to-Mars sprint

A Brazilian cosmologist, Marcelo de Oliveira Souza, uncovered a possible Earth-to-Mars trajectory that could, in theory, cut a round trip to about 153 days by using the early orbital solution of asteroid 2001 CA21 as a geometric reference plane and solving the transfer with Lambert methods. The fastest variant requires an impractically high departure speed (~27 km/s), and the result is a geometric demonstration, not a ready-to-build mission. The finding relies on preliminary asteroid data and would need broader validation across more objects before any planning use. The work highlights a methodological idea: discarded early asteroid orbits might reveal useful transfer geometries rather than being discarded outright.

via Space Daily|

#astronomy-research #earth-to-mars-transfer #lambert-problem

space12 days ago•3 min saved

A Paper Airplane Thrown in Space Would Orbit for About 80 Hours Before Burning Up

University of Tokyo researchers used a numerical model and wind tunnel to simulate an A4 paper airplane released from the ISS. The plane would orbit for about 80 hours, then plunge into the atmosphere and burn up on reentry, though a wind-tunnel test showed it could briefly endure extreme speeds and heat with some edge singeing. The study notes the low cost of paper planes could enable many deployments for small science experiments, but in practice it's probably impractical.

via Jalopnik|

#iss #orbital-dynamics #paper-airplane

space27 days ago•5 min saved

Nereid May Be Neptune's Last Survivor From a Violent Moonpocalypse

A Science Advances study suggests Neptune’s largest moon Triton captured into the planet’s system and wiped out the original moon family, leaving Nereid as a possible native survivor with a highly elongated orbit. JWST infrared data imply Nereid is more like an icy native moon than a captured Kuiper Belt Object, challenging its status as a former KBO. REBOUND simulations show that in about 20% of runs, Triton can eject an inner moon into a long, tilted orbit similar to Nereid’s, implying Nereid could be a frozen relic of Neptune’s violent moon history; confirmation would require a future spacecraft visit.

via sciencealert.com|

#moon #neptune #nereid

space1 month ago•71 min saved

Venus–Jupiter Conjunctions Hint at a Calm, Earth-Friendly Solar System

Space.com explains that Venus and Jupiter will appear very close in the evening sky during a June 9, 2026 conjunction, though the planets are actually separated by vast distances in space. Such conjunctions happen roughly once a year (recent examples include Aug 2025, May 2024, and March 2023). The pattern arises because the solar system is a flat, near-circular disk in which planets orbit near the ecliptic, a “dynamically cold” arrangement that helps keep Earth in a stable, life-friendly zone with abundant water. The article notes that exoplanet systems with tilted orbits could disrupt this balance, underscoring how orbital dynamics relate to Earth’s habitability.

via Space|

#conjunction #habitable-zone #jupiter

space1 month ago•15 min saved

Solar activity threshold quickens the fall of decades-old space junk

A Vikram Sarabhai Space Centre team tracked 17 long-lived pieces of 1960s space debris for 36 years and found that once solar activity passes roughly two-thirds of a cycle's peak (as measured by sunspot number or the 10.7 cm radio flux), the upper atmosphere drags debris downward more rapidly, accelerating decay across three solar cycles. The finding helps forecast debris reentries and plan safer operations, though the sample is small and polar/high-inclination debris show deviations.

via Space Daily|

#orbital-dynamics #solar-cycle #space

science2 months ago•5 min saved

Mars’s Hidden Gravity Tunes Earth’s Climate Across Millennia

A Nature Communications study finds Mars subtly nudging Earth’s orbit through gravitational resonance—altering orbital eccentricity every 26 months and, over millions of years, affecting how much solar energy Earth receives. Geological records from the deep ocean show a ~2.4-million-year cycle tied to stronger deep currents and abyssal eddies, linking planetary motion to long-term climate and ocean dynamics. While this is an ancient, slow driver and not responsible for today’s warming, it helps refine climate models and underlines ocean-system resilience (even if AMOC slows or changes).

via The Daily Galaxy|

#deep-ocean-circulation #earth-climate #mars

science2 months ago•6 min saved

TOI-201: A Chaotic Exoplanet System Rewrites Planet-Formation Rules

NASA’s TESS data reveal the TOI-201 planetary system, where three bodies have misaligned orbits and strong gravitational interactions that actively reshape their motion. One planet (TOI-201b) shows significant transit timing variations, and an outer ≈15 Jupiter-mass companion influences the system’s dynamics, indicating ongoing orbital reshaping rather than a settled, orderly configuration. The discovery, aided by Antarctica-based long-duration observations, provides a rare glimpse of early planetary evolution and challenges the idea that most systems form in calm, coplanar arrangements.

via The Daily Galaxy|

#exoplanets #orbital-dynamics #science

space2 months ago•74 min saved

TOI-201: A wildly different exoplanet system rewrites planetary rules

NASA’s TESS, with help from the Antarctic ASTEP observatory, found TOI-201 a star about 370 light-years away hosting three very different planets. The system includes a rocky super-Earth (~6 Earth masses) with a 5.8‑day year, plus two gas giants—TOI-201b (about half Jupiter mass, 53‑day orbit) and a much more massive companion (~16 Jupiter masses, ~2,883‑day or ~7.9‑year orbit). The outer planet’s highly inclined, eccentric orbit perturbs the inner planets, causing real-time changes in orbital orientation and transit timing. This results in transits that shift over time and, in about 200 years, may no longer line up to transit the star. The configuration is unlike the common “peas in a pod” pattern and provides new clues about how planetary systems reorganize after formation; the findings were published in Science on April 15.

via Space|

#exoplanets #orbital-dynamics #space

science3 months ago•7 min saved

Mars Shapes Earth's Ice-Age Rhythm, New Simulations Show

UC Riverside planetary astrophysicist Stephen Kane’s simulations show Mars exerts a measurable influence on Earth’s orbital variations and tilt, helping to drive Milankovitch cycles that govern ice-age timing. Removing Mars erases two long cycles (about 100,000 and 2.3 million years), while increasing Mars’ mass shortens them, suggesting outer planets can affect climates on Earth-like worlds.

via SciTechDaily|

#earth-climate #ice-ages #mars

science4 months ago•17 min saved

Mars’s gravity may pace Earth’s ice-age clock

New simulations show Mars helps set a 2.4-million-year rhythm in Earth’s orbit that paces Milankovitch cycles and influences ice-age timing. By running the solar system with and without Mars, researchers found the red planet’s gravity shapes orbital frequencies and Earth’s tilt; removing Mars erased a key cycle, tying these climate rhythms to planetary dynamics. While greenhouse gases and ocean circulation remain primary drivers of temperature swings, the study connects orbital science to rock records and suggests broader implications for understanding climates on other worlds.

via Earth.com|

#earth-climate #ice-ages #mars

science5 months ago•5 min saved

Mars Is Earth's Climate Stabilizer, New Study Finds

New simulations indicate Mars’ gravity subtly stabilizes Earth’s climate by damping changes in its axial tilt; without Mars, major climate cycles like ice ages could disappear, and increasing Mars’ mass would shorten these cycles—revealing a surprising, system-wide gravitational connection that could affect how we think about habitability in other planetary systems.

via The Daily Galaxy|

#axial-tilt #earth-climate #habitable-exoplanets

science1 year ago•5 min saved

Kepler Data Reveals Two Unusual Planets in KOI-134 System

Reanalysis of old Kepler data revealed that the KOI-134 system, previously thought to have no planets, actually hosts two planets with unusual orbital dynamics, including significant mutual inclination, resonance, and transit timing variations, making it a unique and first-of-its-kind system.

via Phys.org|

#exoplanets #kepler-data #mutual-inclination

space-and-cosmos2 years ago•2 min saved

"Advancements in Stellar Observations Blur Earth's Historical and Future Understanding"

Astronomers' improved ability to track the motions of stars beyond the solar system has made it more challenging to predict Earth's future and reconstruct its past. New simulations considering the effects of stars passing our solar system have reduced scientists' ability to look back or ahead by another 10 million years, emphasizing the significant impact of external celestial bodies on planetary orbits.

via The New York Times|

#astronomy #earths-history #orbital-dynamics

astronomy3 years ago•8 min saved

Uncovering the Secrets of an Immortal Star in the Cosmos

Physicists have developed a model that explains the unexpected orbit of a star around a supermassive black hole, providing new insights into one of the cosmos’ most extreme environments. The team's findings describe the capture of the star by a supermassive black hole, the stripping of the material each time the star comes close to the black hole, and the delay between when the material is stripped and when it feeds the black hole again. The team is studying a tidal disruption event (TDE) known as AT2018fyk, which is the first to develop and use a detailed model of a repeating partial TDE to explain the observations, make predictions about the orbital properties of a star in a distant galaxy, and understand the partial tidal disruption process.

via SciTechDaily|

#accretion-disk #astronomy #astrophysics