BlackCAT A Catalog of Stellar-Mass Black Holes in X-ray Binaries

ID# 1

Cen X-2

RA (h:m:s)  DEC (º:':")  J2000:
14:00:28.20 -64:47:35.60
( Francey1971 )

Galactic l (º)  b (º)  J2000:
310.2000982  -02.9001343

Year of discovery: 1966  
( Harries1967 )

# of outbursts after discovery:


Basic data

Distance (d) (kpc)
d above plane (z) (kpc)
Orbital period (h)
Peak X-ray flux 1.58E-07
[2-10]
(erg/s/cm2) [keV] Brocksopp2001
Outburst magnitude (AB) (mag)
Quiescent magnitude (AB) (mag)
E(B-V) 1.278 (mag) Schlafly2011
Spectral type
Notes Cen X-2 is the first XRB ever discovered. It has an uncertain position. Kitamoto1990 proposed that it might be GS 1354-64 (BW Cir), rediscovered in 1987. However, if this were true, it would imply an extreme X-ray flux at its distance of 25 kpc ( Casares2009 ).

Optical/NIR magnitudes

Mag. Outburst (AB)
Mag. Quiescence (AB)
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Default image: DSS2 Red
Cen X-2 in Simbad
Finding charts orientation:North up, East left
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Object marked with lines


Finding chart
This research has made use of NASA's Astrophysics Data System (ADS) and the SIMBAD database operated at CDS (Strasbourg, France)
Please acknowledge the use of this catalogue in any published work you derive from it.