Triton’s Binary Partner

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Triton’s Binary Partner
Artist’s impression of a semi-spherical Kuiper belt object, like to what Triton’s Binary Partner would be remotely similar too.
Discovery Data
Discovery Date	Hypothesized
Physical Characteristics
Diameter	Probably less than Triton
Radius	Probably less than Triton
Mass	Probably less than Triton
Number of Moons	0(?)
Axial Tilt	Unknown
Orbital Characteristics
Orbital Period	Possibly less than 5 days(?)

Triton's Binary Partner is a hypothetical object that is one of the possible causes for Triton’s retrograde orbit and capture. The theory is that Triton may have been in a system with another Kuiper belt object (KBO) around 4 billion years ago. When Neptune captured Triton, the other object got ejected. It is currently unknown what the properties of the binary partner are, but it is thought that it is similar to Triton, except smaller and possibly less massive.