Àwọn ààyè-iṣẹ́

Eris

A distant dwarf planet about as large as Pluto and more massive, whose discovery led to the definition of planet.

NASA, ESA, CSA, STScI; J. DePasquale, A. Koekemoer, A. Pagan (STScI) (CC BY 4.0)

The world that made astronomers decide what a planet is, and the reason Pluto was reclassified.

Eris was discovered in 2005. Its highly eccentric, steeply inclined orbit takes it from about 38 to 98 au from the Sun, and one orbit takes about 560 years.

It is slightly more massive than Pluto. Finding a body that size beyond Neptune pushed the International Astronomical Union to define the word planet in 2006. Its moon Dysnomia made it possible to measure its mass.

Wáròyìn nínú àwọn ìṣàmúlò-ètò

Àwọn ìṣàmúlò-ètò ààyè-iṣẹ́

Àwọn àṣẹ
Ìṣàmúlò-ètò	2,400 km	[1]
Àwọn Ìṣàmúlò-ètò	1.66 × 10²² kg	[1]
Ìjánu-ìṣàmúlò-ètò	2.3 g/cm³	[1]
Ìṣàfihàn ààyè-iṣẹ́	0.769 m/s²	Tí a fì ṣẹ̀dà láti inú àtòjọ-ẹ̀yàn ààyè-iṣẹ́
Ìjánu-ìṣàmúlò-ètò	1.36 km/s	Tí a fì ṣẹ̀dà láti inú àtòjọ-ẹ̀yàn ààyè-iṣẹ́
Ìjánu-ìsún	25.9 wkt	[1]
Àwọn ààyè-iṣẹ́	560 ọd	[2]
Àwọn ààyè-iṣẹ́ ìsàlẹ̀-ilà	67.93 au	[2]

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