Circinus X-1
Binary star in the constellation Circinus / From Wikipedia, the free encyclopedia
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Circinus X-1 is an X-ray binary star system that includes a neutron star. Observation of Circinus X-1 in July 2007 revealed the presence of X-ray jets normally found in black hole systems; it is the first of the sort to be discovered that displays this similarity to black holes. Circinus X-1 may be among the youngest X-ray binaries observed.
Quick Facts Constellation, Right ascension ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Circinus |
Right ascension | 15h 20m 40.85s[1] |
Declination | −57° 10′ 00.1″[1] |
Apparent magnitude (V) | 21.40[2] |
Characteristics | |
Spectral type | B5–A0 I[3] |
Variable type | HMXB[4] |
Astrometry | |
Distance | 31000+2600 −3300 ly (9400+800 −1000[5] pc) |
Orbit[3] | |
Period (P) | 16.68 ± 0.15 d |
Eccentricity (e) | 0.45 ± 0.07 |
Periastron epoch (T) | JD 2453473.8 ± 0.4 |
Argument of periastron (ω) (secondary) | 2 ± 12° |
Semi-amplitude (K1) (primary) | 25 ± 2 km/s |
Other designations | |
Database references | |
SIMBAD | data |
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