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

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ID# 1

Cen X-2

( Francey1971 )

RA     [J2000]     DEC

[]          []

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]
Outburst magnitude (AB)
Quiescent magnitude (AB)
E(B-V) [mag] 1.278 Schlafly2011
Spectral type


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
Scroll to zoom. Set survey image in "Manage layers"
Default image: DSS2 Red
Cen X-2 in Simbad

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.

Last modified: 27 August 2021.