companion star

noun, Astronomy.

companion¹ (def 6).

Origin of companion star

1775-1785

First recorded in 1775-85

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Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for companion star

Historical Examples

"Except that we saw that companion star when we stopped back there, half an hour ago," said Fuller.

Islands of Space John W Campbell
This change of brightness is due to the presence of a companion star.

Astronomy for Young Folks Isabel Martin Lewis
The companion star is a faint white star of the ninth magnitude.

Astronomy for Young Folks Isabel Martin Lewis

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