<p>So I have just found this <a href="http://www.asterank.com/" rel="nofollow noreferrer">database</a> - which looks like exactly what I was after!</p>

<p>It has over ½ a million asteroids listed - giving their value and cost to get them as well as a graphical representation of their orbit!</p>

<p>From the  Website's description:</p>

<blockquote>
  <p>Details on orbits and basic physical parameters are sourced from the
  Minor Planet Center and NASA JPL. Composition data is based on
  spectral classification and size.</p>
</blockquote>

CC BY-SA 4.0
2018-06-24T04:07:35.093Z
2018-06-24T04:07:35.093Z
kiltannen
<p>The <a href="https://ssd.jpl.nasa.gov/sbdb_query.cgi" rel="nofollow noreferrer">JPL Small-Body Database Search Engine</a> is a good place to start.
If diameter &lt; 20 m, then probably <a href="https://cneos.jpl.nasa.gov/tools/ast_size_est.html" rel="nofollow noreferrer">absolute magnitude</a> H > 25.
Fortunately we know of over 4000 asteroids in that size range, mostly after close approaches to Earth.
Unfortunately the orbit and magnitude are all we know about most of those, due to limited observational data.
JPL SBDB lists only about 40 asteroids with known Tholen spectral type M, all with perihelion q > 1.5 AU and diameter > 30 km.
The picture is a little brighter for type S, with over 300 known, a few with diameter &lt; 2 km and <a href="https://en.wikipedia.org/wiki/Minimum_orbit_intersection_distance" rel="nofollow noreferrer">minimum orbit intersection distance</a> &lt; 50 LD.</p>

CC BY-SA 4.0
2018-06-20T17:44:10.053Z
2018-06-20T17:44:10.053Z
Mike G
<p>I am interested in the composition of asteroids from the perspective of determining potential targets for mining.</p>

<p>I expect there already exists some data that can be used to identify reasonable targets for mining.</p>

<p>The specific mining method I am looking to evaluate is to send a "collector" out and "grab" a target, bringing it back into LEO for mineral extraction.  Because of this I would like to identify targets that are &lt; 20m diameter. The ideal material to mine/extract would be a precious metal of some kind. This would give the most "bang for the buck". (The buck in this case being the effort rather than Delta V).<br />
Considering the ideal material, I suspect a list of "M" type asteroids and their properties would be the data I am after.</p>

<p>I saw a question that asked about <a href="https://astronomy.stackexchange.com/questions/25953/how-is-ir-spectroscopy-used-to-determine-the-composition-of-asteroids">using IR Spectroscopy</a> to determine the surface composition of asteroids.  That gave some good insight - but no indication of where such data currently exists. A table of this data would be a reasonable starting point.  </p>

<p>I am also wondering if we can determine anything about the relative density of an asteroid by the gravity it exerts on nearby objects.  If that data is available anywhere that would also be an interesting place for me to look.</p>

<p>I am also interested in trying to determine the orbits of any target asteroids, so where would I look for data on the orbits of those that are selected?</p>

CC BY-SA 4.0
2018-06-20T17:39:39.240Z
perhaps https://ssd.jpl.nasa.gov/sbdb_query.cgi  but did you mean  20 meters, or is that meant to be 20km or 20 miles?
James K
<asteroids>
Data on the composition and orbits of asteroids
kiltannen
# Data on the composition and orbits of asteroids

(Asked by: username_0 on 2018-06-20)

I am interested in the composition of asteroids from the perspective of determining potential targets for mining.

I expect there already exists some data that can be used to identify reasonable targets for mining.

The specific mining method I am looking to evaluate is to send a "collector" out and "grab" a target, bringing it back into LEO for mineral extraction. Because of this I would like to identify targets that are < 20m diameter. The ideal material to mine/extract would be a precious metal of some kind. This would give the most "bang for the buck". (The buck in this case being the effort rather than Delta V).  
Considering the ideal material, I suspect a list of "M" type asteroids and their properties would be the data I am after.

I saw a question that asked about [using IR Spectroscopy](https://astronomy.stackexchange.com/questions/25953/how-is-ir-spectroscopy-used-to-determine-the-composition-of-asteroids) to determine the surface composition of asteroids. That gave some good insight - but no indication of where such data currently exists. A table of this data would be a reasonable starting point.

I am also wondering if we can determine anything about the relative density of an asteroid by the gravity it exerts on nearby objects. If that data is available anywhere that would also be an interesting place for me to look.

I am also interested in trying to determine the orbits of any target asteroids, so where would I look for data on the orbits of those that are selected?

**Tags:** asteroids
> **Comments:**
> **username_1**: perhaps https://ssd.jpl.nasa.gov/sbdb_query.cgi  but did you mean  20 meters, or is that meant to be 20km or 20 miles?  

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## 2 answers

### Answer by username_0 on 2018-06-24. Score: 0 | Accepted answer

So I have just found this [database](http://www.asterank.com/) - which looks like exactly what I was after!

It has over ½ a million asteroids listed - giving their value and cost to get them as well as a graphical representation of their orbit!

From the Website's description:

> Details on orbits and basic physical parameters are sourced from the
> Minor Planet Center and NASA JPL. Composition data is based on
> spectral classification and size.


---

### Answer by username_2 on 2018-06-20. Score: 3

The [JPL Small-Body Database Search Engine](https://ssd.jpl.nasa.gov/sbdb_query.cgi) is a good place to start.
If diameter < 20 m, then probably [absolute magnitude](https://cneos.jpl.nasa.gov/tools/ast_size_est.html) H > 25.
Fortunately we know of over 4000 asteroids in that size range, mostly after close approaches to Earth.
Unfortunately the orbit and magnitude are all we know about most of those, due to limited observational data.
JPL SBDB lists only about 40 asteroids with known Tholen spectral type M, all with perihelion q > 1.5 AU and diameter > 30 km.
The picture is a little brighter for type S, with over 300 known, a few with diameter < 2 km and [minimum orbit intersection distance](https://en.wikipedia.org/wiki/Minimum_orbit_intersection_distance) < 50 LD.


---

