Dossier for Ucant Seeme

Recent Mugshot: (Note: This is an artist's conception of Ucant (on the right) drawing material from his companion star.)

Height (solar diameters) = central star = 5, Ucant = too small to measure

Weight (mass in suns) = central star = 25, Ucant = 10 to 20

Age = unknown

General Description:

Ucant is in orbit around an O9 supergiant star forming what astronomers call an x-ray binary. Ucant cannot be seen by any telescope. Instead the x-rays can be detected, emitted as material from the larger central star (HDE 226868) spirals in toward Ucant, forming the accretion disk surrounding him (see mugshot). In fact, Ucant is the brightest and most persistent source of x-rays known. The binary system is 8,000 ly from our solar system in the constellation of Cygnus. Ucant's astronomy name is Cygnus X-1.

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Fingerprint File for Ucant Seeme

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Other Information:

1. Cygnus X-1 paper