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

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ID# 21

GRO J1655-40

N Sco 1994 = V1033 Sco

( Bailyn1995 )

RA     [J2000]     DEC

[]          []

16:54:00.14  -39:50:44.90

ℓ                      b

[deg]                            [deg]

344.9818318  +02.45604284

Year of discovery: 1994  
( Zhang1994 )

# of outbursts after discovery: 2 – 4

Basic data

Distance [kpc] 3.2±0.2 Hjellming1995
Distance to the plane (z) [kpc] 0.14±0.01 Hjellming1995
Orbital period (Porb) [h] 62.92±0.003 VanDerHooft1998
Peak X-ray flux [erg s-1 cm-2]
Outburst magnitude (AB) R=13.55 Bailyn1995
Quiescent magnitude (AB) R=16.3±0.1 Orosz1997 Greene2001 VanDerHooft1998
E(B-V) [mag] 1.3 Horne1996 Orosz1997

Dynamically confirmed BH


GRO J1655-40 (Nova Sco. 1994) has shown several outburst. The peak X-ray flux is taken from its 2005 outburst, the brightest one so far ( Brocksopp2006 ).
Gandhi2019 obtained a distance of 3.74+1.65-0.91 kpc from Gaia DR2.

Dynamical parameters

Orbital period [h] 62.92±0.003 VanDerHooft1998
Star's spectral type F6IV Orosz1997
Star's radial velocity amplitude (K2) [km/s] 226.1±0.8 GonzalezHernandez2008a
Mass function 'f(M1)' [M] 2.73±0.09 Shahbaz1999
BH mass (M1) [M] 6±0.4 Shahbaz2003a
Mass ratio (q=M2/M1) 0.42±0.03 Shahbaz2003a
Inclination angle (i) [deg] 69±2 Beer2002
Rot. broadening (v sini) [km/s] 86+3-4 Shahbaz1999

Optical/NIR magnitudes

Mag. Outburst (AB)
V=14.4 R=13.55
Mag. Quiescent (AB)
Orosz1997 Greene2001 VanDerHooft1998
B∼18.5 V∼17.5 R=16.3±0.1
I∼15.8 i=14.9±0.1
J∼14.76 Ks∼15.12
Aladin finding chart
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GRO J1655-40 in Simbad

Finding charts

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Finding chart
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.