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: 3

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. New outburst reported on June 2025 (Sun2025).

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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