Planets beyond Neptune
Pluto loses Planet X title

Planets beyond Neptune

Section Title: Pluto loses Planet X title
Table Section Text: None

Year	Mass	Notes

1931	1 Earth	Nicholson & Mayall

1942	0.91 Earth	Wylie

1948	0.1 (1/10 Earth)	Kuiper

1973	0.025 (1/40 Earth)	Rawlins

1976	0.01 (1/100 Earth)	Cruikshank, Pilcher, & Morrison

1978	0.002 (1/500 Earth)	Christy & Harrington

2006	0.00218 (1/459 Earth)	Buie et al.

Sentence(s)

In 1931, Nicholson and Mayall calculated Neptune's mass to be equal to 1 Earth, a value similar to the 0.91 Earth mass calculated in 1942 by Lloyd R. Wylie.

final_sentence: In 1931, Nicholson and Mayall calculated Neptune's mass to be equal to 1 Earth, a value similar to the 0.91 Earth mass calculated in 1942 by Lloyd R. Wylie.