Which famous Planet has been redefined as dwarf planet lately?

Answer 1

Well just to be different, I will say 1 Ceres. It has just been reclassified as a dwarf planet, along with Eris and Pluto.

1 Ceres was famous and long anticipated as the Missing Planet between Mars and Jupiter. It had been predicted to exist for some 40 years before its discovery in 1801, whereupon it was immediately given a planetary symbol, appeared in astrpnomical books and tables as a planet, and it remained a planet for over 50 years. It was only when a significant number of other asteroids were discovered, that it got demoted, like Pluto has just been demoted.

THE PREDICTION OF THE MISSING PLANET

The Titius-Bode Law was proposed in 1766 by Johann Daniel Titius and "published" without attribution in 1772 by the director of the Berlin Observatory, Johann Elert Bode, thus the name. However, some sources say it was first proposed by Christian Wolff in 1724.

As originally stated by Titius, the "law" relates the semi-major axis, a, of each planet outward from the sun in units such that the Earth's semi-major axis = 10, with

a = n + 4
where n = 0, 3, 6, 12, 24, 48 ..., with each value of n > 3 twice the previous value; the resulting values can be divided by 10 to convert them into astronomical units (AU). For the outer planets, each planet is 'predicted' to be roughly twice as far away from the Sun as the next inner object.

When originally published, the law was approximately satisfied by all the known planets — Mercury through Saturn — with a gap between the fourth and fifth planets. It was regarded as interesting, but of no great importance until the discovery of Uranus in 1781 which happened to fit neatly into the series.

Imagine the excitement this caused, For the first time since antiquity we had a new planet, and we also had a prediction of another one and where it would be found. This generated considerable enthusiasm and interest in finding The Missing Planet, like the last piece of the jigsaw was being fitted into place.

Based on this discovery, Bode urged a search for a fifth planet. Astronomers diligently scoured the skies and in 1800 Johann Schroeter organised a group of German astronomers, whom he nicknamed the 'Celestial Police', to hunt down the missing planet.

They were beaten to it by Giuseppe Piazzi of Palermo, who found Ceres on New Year's Day 1801 - at 2.8 AU, exactly where it was predicted it would be. But Ceres was not alone, for two other of the 'policemen' were also successful. Olbers found Pallas in 1802 and Vesta in 1807, while Harding discovered Juno in 1804.

Bode's law was then widely accepted until Neptune was discovered in 1846 and found not to satisfy it. The table below shows the predicted distances under the Titius-Bode Law and the actual distances.

Planet T-B rule distance Real distance
Mercury 0.4 0.39
Venus 0.7 0.72
Earth 1.0 1.00
Mars 1.6 1.52
(Ceres) 2.8 2.77
Jupiter 5.2 5.20
Saturn 10.0 9.54
Uranus 19.6 19.2

Answer 2

No it has NOT been kicked out of the Solar System. The words "The Solar System" refer to all bodies within the gravitational influence of the sun, not just "the planets within the gravitational influence of the sun".

Ceres Eris and Pluto have all been redefined as dwarf planets five weeks ago. So all three would be correct answers to this question. Pluto is merely the most obvious answer. Eris (Xena) was widely hailed as being Planet X (X for Xena as well as the Roman Numeral for ten) when it was discpvered in 2003 and found to be larger than Pluto.

It is difficult to measure "fame". All three bodies were greeted with appreciation on discovery and how do you compare the popularity peaks of 1801, 1930 and 2003, given the mass media and literacy levels have changed so much in the intervening years?

So I say all three are correct answers! What say ye?

Answer 3

Pluto.

(Why Pluto is a dwarf planet?

Pluto was stripped of its status as a planet today when scientists from around the world redefined it as a ''dwarf planet'', leaving just eight classical planets in the solar system.

A dwarf planet is a category of celestial bodies in the solar system as introduced in a resolution by the International Astronomical Union (IAU) on August 24, 2006. The definition currently applies only to the Sun's solar system. It applies only to the English language, and terminology may differ in other languages. In the usage approved by the IAU, the category "dwarf planet" is distinct from that of "planet" and also from another new category, "Small Solar System Body".

The resolution describes a dwarf planet as an object that:

(i) is in orbit around the Sun;

(ii) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape;

(iii) has not "cleared the neighbourhood" around its orbit; and

(iv) is not a satellite of a planet, or other nonstellar body.

It differs from the definition of "planet" in that the dwarf planet has not cleared its orbital neighbourhood. This definition reclassified Pluto from a planet to a dwarf planet because it has not cleared the neighbourhood of its orbit .)

Answer 4

Are you serious? How could you phrase this question and not already know the answer??

A dwarf planet is a category of celestial bodies in the solar system as introduced in a resolution by the International Astronomical Union (IAU) on August 24, 2006. The definition currently applies only to the Sun's solar system.[1] It applies only to the English language, and terminology may differ in other languages. In the usage approved by the IAU, the category "dwarf planet" is distinct from that of "planet" and also from another new category, "Small Solar System Body".

The resolution describes a dwarf planet as an object that:

(i) is in orbit around the Sun;

(ii) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape;

(iii) has not "cleared the neighbourhood" around its orbit; and

(iv) is not a satellite of a planet, or other nonstellar body.

It differs from the definition of "planet" in that the dwarf planet has not cleared its orbital neighbourhood. This definition reclassified Pluto from a planet to a dwarf planet because it has not cleared the neighbourhood of its orbit (the Kuiper Belt).

Answer 5

Pluto

Answer 6

Pluto

Answer 7

Pluto

Answer 8

Pluto

Answer 9

Pluto

Answer 10

Pluto

Answer 11

Pluto Pluto Pluto Pluto Pluto Pluto Pluto Pluto Pluto