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

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ID# 24

GRS 1739-278

V2606 Oph

(Hjellming1996)

RA     (ICRS)     DEC [hh:mm:ss.ss]          [dd:mm:ss.ss] 17:42:40.03  -27:44:52.70

ℓ                      b [deg]                            [deg] 000.6720951  01.17572417

Year of discovery: 1996  
(Paul1996)

# of outbursts after discovery: 2

Basic data

Distance [kpc]	7.25±1.25	Greiner1996
Distance to the plane (z) [kpc]	0.15±0.03	Greiner1996
Orbital period (Porb) [h]
Peak X-ray flux [erg s-1 cm-2] [keV]	7.20E-09 [2-10]	MAXI
Outburst magnitude (AB)	J=17.2±0.1	Marti1997
Quiescent magnitude (AB)	J>20.1	Chaty2002a
E(B-V) [mag]	2 – 4	Marti1997
Spectral type	>F5V	Chaty2002a

NOTES

GRS 1739-278 showed another outburst in 2014 (Miller2015b,Krimm2014b) and 2016 (Mereminskiy2016). The peak X-ray flux is taken from the MAXI SSC light curve of that outburst. It has an uncertain distance. Another outburst was reported on June 2023 by Negoro2023,Kennea2023

Optical/NIR magnitudes

Mag. Outburst (AB) Marti1997
	V=23.2±0.3	R=20.6±0.1
	J=17.2±0.1
Mag. Quiescent (AB) Chaty2002a
J>20.1		K (not AB)>18.4

Aladin finding chart

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GRS 1739-278 in Simbad

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Pan-STARRS1 finding chart

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