Near Earth Objects - an overview | ScienceDirect Topics
2018年12月9日 · Near Earth Objects. In subject area: Earth and Planetary Sciences. Near Earth Objects are celestial bodies that frequently visit Earth's vicinity, with some potentially entering the atmosphere and causing catastrophic events such as explosions or crater formations. AI generated definition based on: Encyclopedia of the Solar System (Third ...
Near Earth Objects - an overview | ScienceDirect Topics
2010年6月13日 · Near-earth objects (NEOs) reside in the vicinity of Earth near 1.0 AU (the mean distance between Earth and the Sun). Any object, such as an asteroid or comet, orbiting the Sun with a perihelion, q < 1.3 AU, well inside the orbit of Mars, is defined as an NEO.
Distant Retrograde Orbits for space-based Near Earth Objects …
2016年9月15日 · The international interest towards Near Earth Objects (NEOs) is growing because of the increased awareness of the danger some asteroids or comets pose to the Earth. Potentially Hazardous Asteroids (PHAs) have the potential to make a close approach to the Earth and a size large enough to cause significant regional or global damage in the event ...
Debiased orbit and absolute-magnitude distributions for near …
2018年9月15日 · We provide a four-dimensional debiased orbit and absolute-magnitude distribution for near-Earth objects. •. The model provides information on the relative importance of NEO escape regions in the main asteroid belt and cometary region. •. The absolute-magnitude distribution is in agreement with other recent estimates.
NEOMOD 2: An updated model of Near-Earth Objects from a …
2024年3月15日 · Catalina Sky Survey (CSS) is a major survey of Near-Earth Objects (NEOs). In a recent work, we used CSS observations from 2005–2012 to develop a new population model of NEOs (NEOMOD). CSS’s G96 telescope was upgraded in 2016 and detected over 10,000 unique NEOs since then.
Near-Earth Objects - ScienceDirect
2014年1月1日 · Bibliography 623. 1. Introduction. A near-Earth object (NEO) is an asteroid or comet orbiting the Sun with a perihelion distance of less than 1.3 AU (1 AU, an “astronomical unit”, is the mean distance between the Earth and the Sun, around 150 million km).
Observed spectral properties of near-Earth objects: results for ...
2004年8月1日 · Near-Earth objects, which we define as belonging to the Aten, Apollo, and Amor groups generally having perihelion distances less than 1.3 AU from the Sun (Shoemaker et al., 1979), and Mars-crossing objects have been routinely observed as targets of opportunity within the SMASS program since its inception.
Determining characteristics of artificial near-Earth objects using ...
2018年3月1日 · Furthermore, prediction of future information can be a challenge, as material properties and other characteristics may vary over time due to the harsh space environment. In order to better predict future states of artificial near-Earth objects, identification and characterization must be improved.
The orbital distribution of Near-Earth Objects inside Earth’s orbit
2012年1月1日 · The median lifetime of objects after their first injection into the Vatira region is ≈21 Myr. 42% of these objects are terminated because they do not stay decoupled from Venus and eventually collide with Venus. 16% collide with Earth, 10% collide with Mercury, and ≃1% collide with Mars. 20% evolve onto sun-grazing orbits, ≃9% are still ...
Physical characterization of Warm Spitzer-observed near-Earth …
2014年1月15日 · Abstract. Near-infrared spectroscopy of Near-Earth Objects (NEOs) connects diagnostic spectral features to specific surface mineralogies. The combination of spectroscopy with albedos and diameters derived from thermal infrared observations can increase the scientific return beyond that of the individual datasets.