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

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ID# 37

IGR J17091-3624

SAX J1709.1-3624

(Rodriguez2011a)

RA     (ICRS)     DEC [hh:mm:ss.ss]          [dd:mm:ss.ss] 17:09:07.61  -36:24:25.70

ℓ                      b [deg]                            [deg] 349.5247361  02.21273739

Year of discovery: 2003  
(Kuulkers2003)

# of outbursts after discovery: 3

Basic data

Distance [kpc]
Distance to the plane (z) [kpc]
Orbital period (Porb) [h]
Peak X-ray flux [erg s-1 cm-2] [keV]	5.96E-09 [2-10]	Altamirano2011
Outburst magnitude (AB)	I=18.66±0.03	Torres2011
Quiescent magnitude (AB)
E(B-V) [mag]	1.921	Schlafly2011
Spectral type

NOTES

IGR J17091-3624 showed outbursts in 2007 (Capitanio2008) and 2011 (Krimm2011). Re-examination of archival data showed that is was also active in 1994 (Revnivtsev2003a), 1996 and 2001 (intZand2003,Capitanio2006). New outburst confirmed by NICER on Feb 2025 (Vincentelli2025). The system went back to quiescence by Apr 2025 (Saikia2025) based on optical data, however, WoaheneDemehin2025 reported that the X-ray activity was still consistent with outburst by Jun 2025.

Optical/NIR magnitudes

Mag. Outburst (AB) Torres2011
			I=18.66±0.03
Mag. Quiescent (AB)

Aladin finding chart

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IGR J17091-3624 in Simbad

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Finding charts

Orientation: North up, East left. Object marked
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Finding chart reference: Torres2011

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