Pluto Demoted Day - August 24
Wed, Aug 24, 2022

Pluto Demoted Day

Pluto Demoted Day is celebrated mainly by the scientific community on August 24 each year. This interesting holiday is dedicated to an important astronomical fact: Pluto is not a classical planet. He is a dwarf planet. This is the result of current space research.


August 24, 2006 from the International Astronomical Union (MAS) was followed by the announcement that Pluto did not meet all the requirements for classical planets. So the date of Pluto Demoted Day was determined. Classical celestial bodies are recognized as orbiting around the Sun and having enough mass so that the gravitational force forms them in the form of a sphere. Also, they should not be satellites of other celestial bodies and clear their own celestial path from other celestial bodies.

MAS formulated these parameters, and Pluto does not correspond to the latter. Other factors also influenced its position: it is smaller than the Earth’s moon, its upper layer consists of stone (it is gaseous in its neighbors). It moves in an orbit with an angle of 17 ° (different from the rotation of the other planets), and Charon, the largest of the moons rotating with it, is only 2 times smaller than it and differs in rotation around the same center of gravity.

Interesting facts

What you need to know about Pluto:

  1. It was discovered in 1930 by an employee recently hired by the Lowell Observatory, Clyde Tombaugh.
  2. The name was given to him by an 11-year-old schoolgirl from Oxford, Venetia Burney, who was interested not only in astronomical discoveries, but also in myths. Pluto is the ancient Roman name for Hades, the god of the underworld. It seemed to Venice that this name would suit the dark ice world.
  3. Astronomer Hoei Nojiri from Japan suggested a similar option – he suggested calling the newly discovered planet the “Star of the Underground King.”
  4. Pluto entered the catalog of minor planets with the number 134340.
  5. Thanks to Pluto Demoted Day, a new verb “to pluto” has appeared, meaning “to demote”.

How to celebrate

You can celebrate Pluto Demoted Day by devoting it to space exploration. Visit the observatory, arrange a competition with your family or friends – who is better able to find the constellations in the night sky. Tell the children about our solar system.

When is Pluto Demoted Day celebrated in 2022?

Pluto Demoted Day is observed on August 24 each year.


Weekday Month Day Year
Wednesday August 24 2022
Thursday August 24 2023
Saturday August 24 2024
Sunday August 24 2025
Monday August 24 2026

What today?

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