Àwọn ààyè-iṣẹ́

Halley's Comet (1P/Halley)

The most famous periodic comet, returning about every 75 to 76 years.

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

The first comet anyone predicted would come back, and it did.

Edmond Halley realised in 1705 that comets seen in 1531, 1607 and 1682 were the same object and predicted its return in 1758. It was the first comet recognised as periodic.

Its orbit is very eccentric (e ≈ 0.97) and retrograde. It last passed the Sun in 1986, when the ESA Giotto spacecraft flew close to its nucleus, and will return in 2061.

Wáròyìn nínú àwọn ìṣàmúlò-ètò

Àwọn ìṣàmúlò-ètò ààyè-iṣẹ́

JPL Small-Body Database

Àwọn ìrànwọ́ àti àkọlé lòòlù àwọn módè́ì tí a fi pamọ́ fún ìmọ̀. Kò yẹ ki wọn lò fún ìṣàfihàn, ìṣàmúlò-ètò àti àwọn ìṣẹ̀dá iṣẹ́. Àwọn ìwé-ẹ̀rì ní ọ̀fẹ̀ àti àwọn ààyè-iṣẹ́ kò ní ìgbà gbà. Ka àwọn ìṣàmúlò-ètò ìròyìn

Ìṣàmúlò-ètò	11 km	[1]
Àwọn ààyè-iṣẹ́	75.9 ọd	[1]
Àwọn ààyè-iṣẹ́ ìsàlẹ̀-ilà	17.93 au	[1]