Results 91 to 100 of about 4,565,671 (287)
Orbit Precision Analysis of Small Man-Made Space Objects in LEO Based on Radar Tracking Measurements [PDF]
, 2012 The German Space Operations Center (GSOC) performs collision avoidance for 11 LEO and 2 GEO satellites. Risk detection and maneuver decisions strongly depend on the computed probability of collision that is driven by the anticipated orbit precision of ...
Letsch, Klemens +6 more
core
Direct initial orbit determination
, 2023 Initial orbit determination (IOD) is an important early step in the processing chain that makes sense of and reconciles the multiple optical observations of a resident space object.
Payne, Timothy +3 more
core
A method for perturbed initial orbit determination and correlation of radar measurements [PDF]
, 2020 The increasing number of space debris in orbit leads to a growing workload of space surveillance systems. For objects in Low Earth Orbit, radar systems have to maintain orbits of known objects and detect new ones.
Schildknecht, Thomas +2 more
core +1 more source
FEBS Letters, EarlyView.Encapsulins are protein nanocompartments that play an important role in iron storage. In the Myxococcus xanthus encapsulin system, two cargo proteins called EncB and EncC contribute to iron mineralization. Here, we show that EncB and EncC generate iron‐containing minerals with distinct chemical compositions, suggesting that the composition of stored ...
Harry B. McDowell +2 more
wiley +1 more source
Analytic Initial Orbit Determination using Satellite Streaks in Digital Images
, 2021 Presented at the 2021 AAS/AIAA Astrodynamics Specialist Conference in Big Sky, MT.Earth orbiting satellites often appear as streaks in images collected by inertially pointed cameras or telescopes.
Christian, John A.
core +1 more source
Track association performance of the best hypotheses search method [PDF]
, 2013 Uncontrolled space objects in the geostationary orbit domain are hazardous threats for active satellites. Catalogs need to be build up, in order to protect this precious domain. The Swiss ZimSMART telescope, located in Zimmerwald, regularly scans the
Fiedler, H. +5 more
core +1 more source
FEBS Letters, EarlyView.Mycobacterial 3‐methylcrotonyl‐CoA carboxylase uses a mobile biotin‐carrying domain to shuttle a carboxyl group between two catalytic sites, enabling carboxylation of 3‐methylcrotonyl‐CoA during leucine breakdown. Cryo‐electron microscopy captures the carrier at both sites and reveals an inward loop movement that may prevent futile rebinding to the ...
Ajit Yadav +2 more
wiley +1 more source
Shadowing Lemma and chaotic orbit determination
, 2016 Orbit determination is possible for a chaotic orbit of a dynamical system, given a finite set of observations, provided the initial conditions are at the central time.
MILANI COMPARETTI, ANDREA +1 more
core +1 more source
FEBS Letters, EarlyView.How do genomes gain new functional parts? In eukaryotes, which tend to evolve under weak selection, much of the genome is junk. Palazzo and Qiu borrow the logic of Markov chains to show how non‐functional DNA becomes functional through the appearance of intermediate states, which arise due to epistasis, buffering, and biochemical messiness, allowing ...
Alexander F. Palazzo, Yi Qiu
wiley +1 more source
Autonomous Orbit Determination of LLO Satellite Using DRO–LLO Links and Lunar Laser Ranging
AerospaceA stable and high-precision autonomous orbit determination scheme for a Low Lunar Orbit (LLO) spacecraft is proposed, leveraging satellite-to-satellite tracking (SST) measurement data and lunar laser ranging data.
Shixu Chen +4 more
doaj +1 more source