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

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ID# 6

3A 1524-617


( Zurita2015 )

RA     [J2000]     DEC

[]          []

15:28:16.97  -61:52:57.80

ℓ                      b

[deg]                            [deg]

320.3189872  -04.42688518

Year of discovery: 1974  
( Pounds1974 Holt1974 )

# of outbursts after discovery: 1

Basic data

Distance [kpc]
Distance to the plane (z) [kpc]
Orbital period (Porb) [h] 8 – 15 Zurita2015
Peak X-ray flux [erg s-1 cm-2]
Outburst magnitude (AB) B=17.3 Murdin1977
Quiescent magnitude (AB) I=21.78±0.09 Zurita2015
E(B-V) [mag] 0.629 Schlafly2011
Spectral type K0 – 2V Zurita2015


KY TrA showed another outburst in 1990 ( Barret1992 ). The orbital period estimate is very uncertain. It has an interloper with similar brightness 1.4” away ( Zurita2015 ).

Optical/NIR magnitudes

Mag. Outburst (AB)
Mag. Quiescent (AB)
V=23.6±0.1 R=22.4±0.1
Aladin finding chart
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Default image: DSS2 Red
3A 1524-617 in Simbad

Finding charts

Orientation: North up, East left. Object marked
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Finding chart reference: Zurita2015

Finding chart
Finding chart
Finding chart

Comparison stars (AB mag)

BS=14.99 VS=14.29
BT=17.07 VT=16.36
BX=18.44 VX=17.56
BQ=19.44 VQ=17.86

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.