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

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ID# 32

XTE J1118+480


( Fender2001b )

RA     [J2000]     DEC

[]          []

11:18:10.79  +48:02:12.42

ℓ                      b

[deg]                            [deg]

157.6611620  +62.32056579

Year of discovery: 2000  
( Remillard2000 )

# of outbursts after discovery: 2

Basic data

Distance [kpc] 1.72±0.1 Gelino2006
Distance to the plane (z) [kpc] 1.52±0.09 Gelino2006
Orbital period (Porb) [h] 4.0784088±5E-07 Torres2004 GonzalezHernandez2014
Peak X-ray flux [erg s-1 cm-2]
Outburst magnitude (AB) I=13.6±0.1 Torres2002 Zurita2005 Hynes2000
Quiescent magnitude (AB) i’=19.0±0.2 Gelino2006 Shahbaz2005
E(B-V) [mag] 0.024 Garcia2000

Dynamically confirmed BH


XTE J1118+480 showed an outburst in 2005 ( Zurita2005 ). The peak X-ray flux is taken from that outburst ( Brocksopp2010 ).
Simon2020 detected another outburst ocurred in 1927 analysing photographic plates, also as a double event with a precursor similar to the outburst occurred in 2000.
Gandhi2019 obtained a distance of 4.16+3.91-2.12 kpc from Gaia DR2.
GonzalezHernandez2012 and GonzalezHernandez2014 reported a period derivative of -1.9±0.6 ms/yr

Dynamical parameters

Orbital period [h] 4.0784088±5E-07 Torres2004 GonzalezHernandez2014
Star's spectral type K7 – M1V Khargharia2013
Star's radial velocity amplitude (K2) [km/s] 708.8±1.4 GonzalezHernandez2008
Mass function 'f(M1)' [M] 6.27±0.04 GonzalezHernandez2008
BH mass (M1) [M] 6.9 – 8.2 Khargharia2013
Mass ratio (q=M2/M1) 0.024±0.009 Calvelo2009
Inclination angle (i) [deg] 68 – 79 Khargharia2013
Rot. broadening (v sini) [km/s] 96+3-11 Calvelo2009

Optical/NIR magnitudes

Mag. Outburst (AB)
Torres2002 Zurita2005 Hynes2000
V=13.0±0.3 R=13.42±0.01 I=13.6±0.1
Mag. Quiescent (AB)
Gelino2006 Shahbaz2005
B=20.0 V=19.61 g'=21±0.3 R=19.1
J=18.6±0.1 H=18.0±0.1 Ks=18.5±0.1
Aladin finding chart
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XTE J1118+480 in Simbad

Pan-STARRS1 finding chart

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PS1 Finding chart PS1 Finding chart

Finding charts

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Finding chart
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.