List of minor planets
This is a dynamic list and may never be able to satisfy particular standards for completeness. You can help by expanding it with reliably sourced entries.
This is a list of numbered minor planets in the Solar System, in numerical order. As of April 2016 there are 467,308 numbered minor planets, and 245,835 unnumbered.[1]
Most are not particularly noteworthy; only 19,933 minor planets have been given names[1] The Jupiter trojan (3708) 1974 FV1 is currently the lowest-numbered unnamed minor planet.[2]
Five minor planets have been accepted as dwarf planets by the IAU, and hundreds more are likely to be dwarf planets.
The following are lists of minor planets by physical properties, orbital properties, or discovery circumstances:
- Asteroids and dwarf planets
- Comets
Numbering and naming conventions
Total, numbered, and named minor planets from 1995 to 2016.
After discovery, asteroids generally receive a provisional designation (such as "1989 AC"), then a sequential number (such as 4179), and finally (optionally) a name (such as "Toutatis"), in that order.
In modern times, an asteroid receives a sequential number only after it has been observed several times over at least 4 oppositions[3]. Asteroids whose orbits are not (yet) precisely known are known by their provisional designation. This rule was not necessarily followed in earlier times, and some asteroids received a number but became subsequently lost asteroid . All of these have now been recovered; the last "lost" numbered asteroid was 719 Albert.
Only after a number is assigned is the asteroid eligible to receive a name. Usually the discoverer has up to 10 years to pick a name; some asteroids remain unnamed. Especially towards the end of the twentieth century, with large-scale automated asteroid discovery programs such as LINEAR, the pace of discoveries has increased so much that it seems likely that the vast majority of minor planets will never receive names.
For the reasons mentioned above, the sequence of numbers only approximately matches the timeline of discovery. In extreme cases, such as lost asteroids, there may be a considerable mismatch: for instance the high-numbered 69230 Hermes was originally discovered in 1937, but it was a lost until 2003. Only after it was rediscovered could its orbit be established and a number assigned.
Index to lists of minor planets
The minor planets are listed in the following:
See also
By criteria
References
- 1 2 "Minor Planet Statistics". Minor Planet Center. Retrieved 2016-04-26.
- ↑ "Discovery Circumstances: Numbered Minor Planets (1)-(5000)". Minor Planet Center. Retrieved 2016-04-26.
- ↑ An opposition is the time when an asteroid is at its furthest apparent point from the Sun, and in this case is defined as the time when an asteroid is far enough from the Sun to be observed from the Earth. In most cases, this is about 4 to 6 months a year. Some notable asteroids are exceptions to this rule, such as 367943 Duende.
Further reading
- Dictionary of Minor Planet Names, 5th ed.: Prepared on Behalf of Commission 20 Under the Auspices of the International Astronomical Union, Lutz D. Schmadel, ISBN 3-540-00238-3
- The Names of the Minor Planets, Paul Herget, 1968, OCLC 224288991
External links