Template:Extrasolar planet counts/numbers/NEA
This subtemplate template centralizes the counts of verified extrasolar planets, and systems. These are used in several articles, and sometimes more than once. Placing them here allows them all to be updated at once, and avoids the problem of only one count in an article getting updated.
The parameters passed from {{extrasolar planet counts}} are as follows, and were last updated on 26 June 2025:
asof- the date as of which the data is valid- There is a secondary unnamed param 2 on asof that specifies the date format, as used in {{date}}
planet_count- the number of extrasolar planetssystem_count- the number of systems with extrasolar planetsmultiplanetsystem_count- the number of systems with more than one extrasolar planetref- These numbers are sourced from NASA Exoplanet Archive. The reference does not need to be updated unless the URL itself changes.
How these numbers are calculated: The Exoplanet Archive shows the total number of planets in its database, but not the number of planetary systems. However, this can be calculated from the "Number of Planets" column in the Planetary Systems table.
- Go to the Planetary Systems table and search for "1" in the "Number of Planets" column. In the lower left you will see the number of entries now shown in the table; this is the number of planets in 1-planet systems, and thus also the number of 1-planet systems.
- Now search for planets in 2-planet systems. Since there is an entry for each planet, the number of entries is twice the number of 2-planet systems, so you have to divide it by two.
- Do the same thing for 3-, 4-, 5-, 6-, 7- and 8-planet systems.
- (number of planets in n-planet systems)/n = (number of n-planet systems)
- As of this writing, there is no known system with more than 8 planets (but you can check by searching ">8" in the "Number of Planets" column).
- Adding the numbers of systems with 2 through 8 planets will give the total number of multi-planetary systems.
- (2-planet systems)+(3-planet systems)+(4-planet systems)+(5-planet systems)+(6-planet systems)+(7-planet systems)+(8-planet systems) = (total multi-planet systems)
- Adding that to the number of 1-planet systems will give the total number of planetary systems.
Examples
[edit]- {{Extrasolar planet counts/numbers/NEA|1}} → 26 June 2025
- {{Extrasolar planet counts/numbers/NEA|2}} → 5,926
- {{Extrasolar planet counts/numbers/NEA|3}} → 4,419
- {{Extrasolar planet counts/numbers/NEA|4}} → 996
- {{Extrasolar planet counts/numbers/NEA|5}} → [1]
See also
[edit]References
[edit]- ^ "Planetary Systems Composite Data". NASA Exoplanet Archive. Retrieved 26 June 2025.