#WRAP "Unusual Minor Planets" "/iau/lists/"
<h2>Unusual Minor Planets</h2>
The lists of unusual objects accessible from this page include both
close-approach and distant objects.  Note that the definitions
of Aten, Apollo and Amor objects differ between different groups.
The definitions used here are that: Atens have semimajor axes less than
1.0 AU; Apollos have perihelion distances less than 1.0 AU and semimajor
axes greater than 1.0 AU; and Amors have perihelion distances between 1.0
and 1.3 AU.  Centaur objects have perihelia
beyond the orbit of Jupiter and semimajor axes inside the orbit of Neptune.
Transneptunian objects have orbits with semimajor axes beyond the orbit of
Neptune--some of these objects, generally assumed to be in librations with
Neptune, have perihelion distances inside the orbit of Neptune.
<p><hr><p>
At the present time, these lists contain entries for the following
numbers of objects:
<ul>
<li> 6708 close approach
<li> 1386 distant objects
<li>  302 other unusual objects
</ul>
More specifically:
<ul>
<li>  551 Atens
<li> 3355 Apollos
<li> 2802 Amors
<li>  256 Centaurs and Scattered-Disk Objects
<li> 1130 transneptunians
</ul>
<p>
The close-approach lists are here:
<ul>
<li>Atens (by <a href="Atens.html">designation</a> or by <a href="Atensq.html">
perihelion distance</a>)
<li>Apollos (by <a href="Apollos.html">designation</a> or by <a href="Apollosq.html">
perihelion distance</a>)
<li>Amors (by <a href="Amors.html">designation</a> or by <a href="Amorsq.html">
perihelion distance</a>)
</ul>
<p>
The distant-object lists are here (ordered by designation):
<ul>
<li><a href="Centaurs.html">Centaurs and Scattered-Disk Objects</a>
<li><a href="TNOs.html">Transneptunians</a>
</ul>
<p>
The Trojan lists are here (ordered by designation):
<ul>
<li><a href="MarsTrojans.html">Martian</a>
<li><a href="JupiterTrojans.html">Jovian</a>
<li><a href="NeptuneTrojans.html">Neptunian</a>
</ul>
<p>
Here is a list of <a href="Others.html">other unusual objects</a> that do not
fit into any of the above categories.
<p>
The <a href="Dangerous.html"> 1087 Potentially Hazardous Asteroids (the minor
planets with the greatest potential for close approaches to the earth)</a>
include those objects with H brighter than or equal to V = 22.0 and an
Earth MOID (see <a href="StatsExplanation.html">explanation</a>) less than 0.05
AU.
<p>
<p><hr><p>
This page was last updated on 2010 Feb. 12.