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Cygnus X-3

Cygnus X-3
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Cygnus[1]
Right ascension 20h 32m 25.78s[2]
Declination +40° 57′ 27.9″[2]
Characteristics
Spectral type WN 4–6[3]
Astrometry
Radial velocity (Rv)208+113
−127[3] km/s
Distance7,400±1,100[4] pc
Absolute magnitude (MV)−4.5[3]
Orbit[3]
Period (P)4.8 hours
Semi-amplitude (K1)
(primary)		379+124
−149 km/s
Details
WR
Mass8–14[3] M☉
Radius<2[3] R☉
Luminosity209,000+93,000
−64,000[3] L☉
Temperaturemore than 80,000[3] K
compact object
Mass2.4+2.1
−1.1[5] M☉
Other designations
V1521 Cyg, 18P 57, WR 145a, X Cyg X-3, RX J2032.3+4057, INTEGRAL1 118, 2U 2030+40, 3U 2030+40, 4U 2030+40[6]
Database references
SIMBADdata

Cygnus X-3 is a high-mass X-ray binary (HMXB), one of the stronger binary X-ray sources in the sky. It is often considered to be a microquasar, and it is believed to be a compact object in a binary system which is pulling in a stream of gas from an ordinary star companion. It is one of only two known HMXBs containing a Wolf–Rayet star. It is invisible visually, but can be observed at radio, infrared, X-ray, and gamma-ray wavelengths.

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  6. ^ Cite error: The named reference sbxy was invoked but never defined (see the help page).

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