NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Near-Earth ObjectsA near-Earth object (NEO) is an asteroid or comet orbiting the Sun with a perihelion distance of less than 1.3 Astronomical Units (AU) (1 AU, an astronomical unit, is the mean distance between the Earth and the Sun, around 150 million kilometers). If the orbit of an NEO can bring it to within 0.05 AU of the Earth's orbit, and it is larger than about 120 meters, it is termed a potentially hazardous object (PHO); an object of this size is likely to survive passage through the atmosphere and cause extensive damage on impact. (The acronyms NEA and PHO are used when referring specifically to asteroids.)
Document ID
20160010086
Document Type
Book Chapter
Authors
Harris, Alan W. (Deutsches Zentrum fuer Luft- und Raumfahrt e.V. Berlin, Germany)
Drube, Line (Deutsches Zentrum fuer Luft- und Raumfahrt e.V. Berlin, Germany)
McFadden, Lucy A. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Binzel, Richard P. (Massachusetts Inst. of Tech. Cambridge, MA, United States)
Date Acquired
August 5, 2016
Publication Date
October 12, 2014
Publication Information
Publication: Encyclopedia of the Solar System
Volume: Chapter 27
ISBN:
Subject Category
Lunar and Planetary Science and Exploration
Report/Patent Number
GSFC-E-DAA-TN23150
Distribution Limits
Public
Copyright
Other
Keywords
NEO
ASTEROID
comet