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     (ICRS)     DEC [hh:mm:ss.ss]          [dd:mm:ss.ss] 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]	62.926272±0.000096	Petretti2023
Peak X-ray flux [erg s-1 cm-2] [keV]	1.15E-07 [2-10]	Brocksopp2006
Outburst magnitude (AB)	R=13.55	Bailyn1995
Quiescent magnitude (AB)	R=16.3±0.1	Orosz1997Greene2001VanDerHooft1998Petretti2023
E(B-V) [mag]	1.3	Horne1996Orosz1997

Dynamically confirmed BH

NOTES

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]	62.926272±0.000096	Petretti2023
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) Bailyn1995
	V=14.4	R=13.55
Mag. Quiescent (AB) Orosz1997Greene2001VanDerHooft1998Petretti2023
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

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Finding charts

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