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

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ID# 32

XTE J1118+480

KV UMa

(Fender2001b)

RA     (ICRS)     DEC [hh:mm:ss.ss]          [dd:mm:ss.ss] 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	Torres2004GonzalezHernandez2014
Peak X-ray flux [erg s-1 cm-2] [keV]	4.99E-10 [2-10]	Brockshopp2010
Outburst magnitude (AB)	I=13.6±0.1	Torres2002Zurita2005Hynes2000
Quiescent magnitude (AB)	i’=19.0±0.2	Gelino2006Shahbaz2005
E(B-V) [mag]	0.024	Garcia2000

Dynamically confirmed BH

NOTES

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	Torres2004GonzalezHernandez2014
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) Torres2002Zurita2005Hynes2000
	V=13.0±0.3	R=13.42±0.01	I=13.6±0.1
	J=12.83±0.07
Mag. Quiescent (AB) Gelino2006Shahbaz2005
B=20.0	V=19.61	g'=21±0.3	R=19.1
		i’=19.0±0.2
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

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Pan-STARRS1 finding chart

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Finding charts

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