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unseen companion
An object, such as an extrasolar planet, brown dwarf, low-luminosity star, or black hole, that is too dim or near to its primary to be imaged but the existence of which can be inferred by other means, such as Doppler spectroscopy, astrometry, or photometry.
Related category
• EXTRASOLAR PLANETS AND SUBSTELLAR OBJECTSAlso on this site:
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