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

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ID# 5

1H 1659-487

GX 339-4 = V821 Ara

( Gallo2004 )

RA     [J2000]     DEC

[]          []

17:02:49.40  -48:47:23.40

ℓ                      b

[deg]                            [deg]

338.9390902  -04.32648295

Year of discovery: 1972  
( Markert1973 )

# of outbursts after discovery: >20

Basic data

Distance [kpc] >5 Hynes2004 Heida2017
Distance to the plane (z) [kpc] >-0.45 Hynes2004 Heida2017
Orbital period (Porb) [h] 42.21±0.01 Heida2017 Hynes2003a Levine2006
Peak X-ray flux [erg s-1 cm-2]
Outburst magnitude (AB) I=13.6±0.1 Buxton2012
Quiescent magnitude (AB) r=19.9±0.1 Shahbaz2001 Lewis2012
E(B-V) [mag] 1.2 Hynes2004

Dynamically confirmed BH


1H J1659-487 (GX 339-4) is a quasi persistent source. Peak X-ray flux from the 2002 outburst ( Homan2005 ). Peak outburst magnitude obtained from Buxton2012 (MJD=54132).

Dynamical parameters

Orbital period [h] 42.21±0.01 Heida2017 Hynes2003a Levine2006
Star's spectral type K1 – 2 probably IV Hynes2004 Munoz-Darias2008 Heida2017
Star's radial velocity amplitude (K2) [km/s] >219±3 Heida2017
Mass function 'f(M1)' [M] 1.91±0.08 Heida2017
BH mass (M1) [M] 2.3 – 9.5 Heida2017
Mass ratio (q=M2/M1) ≤0.18±0.05 Heida2017
Inclination angle (i) [deg] 37 – 78 Heida2017
Rot. broadening (v sini) [km/s] 64±8 Heida2017

Optical/NIR magnitudes

Mag. Outburst (AB)
V=14.7±0.1 I=13.6±0.1
Mag. Quiescent (AB)
Shahbaz2001 Lewis2012
Aladin finding chart
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Default image: DSS2 Red
1H 1659-487 in Simbad

Finding charts

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

Comparison stars (AB mag)

V1=18.50±0.06 I1=15.57±0.07 J1=14.26±0.09 H1=13.88±0.09
V2=17.39±0.05 I2=15.80±0.07 J2=14.79±0.09 H2=14.41±0.10
V3=16.95±0.05 I3=15.93±0.06

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.