scholarly journals The strength and detectability of the YORP effect in near-Earth asteroids: a statistical approach

2013 ◽  
Vol 430 (2) ◽  
pp. 1376-1389 ◽  
Author(s):  
B. Rozitis ◽  
S. F. Green
Keyword(s):  
Statistical Approach ◽  
Yorp Effect ◽  
Near Earth Asteroids

scholarly journals Influence of the YORP effect on rotation rates of near-Earth asteroids

2013 ◽  
Vol 49 (1) ◽  
pp. 80-85 ◽  
Author(s):  
Dmitrij Lupishko ◽  
Iryna Tielieusova
Keyword(s):  
Rotation Rates ◽  
Yorp Effect ◽  
Near Earth Asteroids

Axial rotation of near-earth asteroids: The influence of the YORP effect

2013 ◽  
Vol 47 (1) ◽  
pp. 20-23
Author(s):  
D. F. Lupishko ◽  
I. N. Teleusova
Keyword(s):  
Axial Rotation ◽  
Yorp Effect ◽  
Near Earth Asteroids

scholarly journals Detection of the YORP Effect on the contact-binary (68346) 2001 KZ66 from combined radar and optical observations

2021 ◽  
Author(s):  
Tarik J Zegmott ◽  
S C Lowry ◽  
A Rożek ◽  
B Rozitis ◽  
M C Nolan ◽  
...  
Keyword(s):  
Dynamical Evolution ◽  
Optical Observations ◽  
Stable Configuration ◽  
Shape Model ◽  
Radar Observations ◽  
Rotational Evolution ◽  
Yorp Effect ◽  
Contact Binary ◽  
Arecibo Observatory ◽  
Near Earth Asteroids

Abstract The YORP effect is a small thermal-radiation torque experienced by small asteroids, and is considered to be crucial in their physical and dynamical evolution. It is important to understand this effect by providing measurements of YORP for a range of asteroid types to facilitate the development of a theoretical framework. We are conducting a long-term observational study on a selection of near-Earth asteroids to support this. We focus here on (68346) 2001 KZ66, for which we obtained both optical and radar observations spanning a decade. This allowed us to perform a comprehensive analysis of the asteroid’s rotational evolution. Furthermore, radar observations from the Arecibo Observatory enabled us to generate a detailed shape model. We determined that (68346) is a retrograde rotator with its pole near the southern ecliptic pole, within a 15○ radius of longitude 170○ and latitude −85○. By combining our radar-derived shape model with the optical light curves we developed a refined solution to fit all available data, which required a YORP strength of $(8.43\pm 0.69)\times 10^{-8} \rm ~rad ~day^{-2}$. (68346) has a distinct bifurcated shape comprising a large ellipsoidal component joined by a sharp neckline to a smaller non-ellipsoidal component. This object likely formed from either the gentle merging of a binary system, or from the deformation of a rubble pile due to YORP spin-up. The shape exists in a stable configuration close to its minimum in topographic variation, where regolith is unlikely to migrate from areas of higher potential.

Statistical results on discovered near-Earth asteroids

1999 ◽  
Vol 173 ◽  
pp. 81-86
Author(s):  
S. Berinde
Keyword(s):  
Dynamical Evolution ◽  
Minor Planet ◽  
Orbital Elements ◽  
The Earth ◽  
Near Earth Asteroids ◽  
Statistical Results

AbstractThe first part of this paper gives a recent overview (until July 1st, 1998) of the Near-Earth Asteroids (NEAs) database stored at Minor Planet Center. Some statistical interpretations point out strong observational biases in the population of discovered NEAs, due to the preferential discoveries, depending on the objects’ distances and sizes. It is known that many newly discovered NEAs have no accurately determinated orbits because of the lack of observations. Consequently, it is hard to speak about future encounters and collisions with the Earth in terms of mutual distances between bodies. Because the dynamical evolution of asteroids’ orbits is less sensitive to the improvement of their orbital elements, we introduced a new subclass of NEAs named Earth-encounter asteroids in order to describe more reliably the potentially dangerous bodies as impactors with the Earth. So, we pay attention at those asteroids having an encounter between their orbits and that of the Earth within 100 years, trying to classify these encounters.

Delivering Sustainable Water Systems Using Kalman Filter and Statistical Approach

2017 ◽  
Vol 4 (1) ◽  
pp. 41-52
Author(s):  
Dedy Loebis
Keyword(s):  
Kalman Filtering ◽  
Statistical Approach ◽  
Water Systems ◽  
Data Sets ◽  
Pressure Data ◽  
Burst Event ◽  
Sample Data ◽  
Other Information ◽  
Supply Systems ◽  
Frequency Features

This paper presents the results of work undertaken to develop and test contrasting data analysis approaches for the detection of bursts/leaks and other anomalies within wate r supply systems at district meter area (DMA)level. This was conducted for Yorkshire Water (YW) sample data sets from the Harrogate and Dales (H&D), Yorkshire, United Kingdom water supply network as part of Project NEPTUNE EP/E003192/1 ). A data analysissystem based on Kalman filtering and statistical approach has been developed. The system has been applied to the analysis of flow and pressure data. The system was proved for one dataset case and have shown the ability to detect anomalies in flow and pres sure patterns, by correlating with other information. It will be shown that the Kalman/statistical approach is a promising approach at detecting subtle changes and higher frequency features, it has the potential to identify precursor features and smaller l eaks and hence could be useful for monitoring the development of leaks, prior to a large volume burst event.

Some Dynamic Characteristics of Binary Near-Earth Asteroids

2017 ◽  
Vol 13 (1) ◽  
pp. 30-33
Author(s):  
N.V. Ivanenko ◽  
◽  
О.A. Bazyey ◽  
Keyword(s):  
Dynamic Characteristics ◽  
Near Earth Asteroids
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