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

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ID# 1

Cen X-2

(Francey1971)

RA     (ICRS)     DEC [hh:mm:ss.ss]          [dd:mm:ss.ss] 14:00:28.20  -64:47:35.60

ℓ                      b [deg]                            [deg] 310.2000982  -02.9001343

Year of discovery: 1966  
(Harries1967)

# of outbursts after discovery:

Basic data

Distance [kpc]
Distance to the plane (z) [kpc]
Orbital period (Porb) [h]
Peak X-ray flux [erg s-1 cm-2] [keV]	1.58E-07 [2-10]	Brocksopp2001
Outburst magnitude (AB)
Quiescent magnitude (AB)
E(B-V) [mag]	1.278	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. Quiescent (AB)

Aladin finding chart

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Cen X-2 in Simbad

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