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

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ID# 63

MAXI J1820+070

ASASSN-18ey = V3721 Oph

(Bahramian2018Gandhi2019)

RA     (ICRS)     DEC [hh:mm:ss.ss]          [dd:mm:ss.ss] 18:20:21.94  +07:11:07.19

ℓ                      b [deg]                            [deg] 035.8535506  10.1591562

Year of discovery: 2018  
(Tucker2018Kawamuro2018)

# of outbursts after discovery:

Basic data

Distance [kpc]	3.46+2.18-1.03/ 2.96±0.33	Gandhi2019Atri2020
Distance to the plane (z) [kpc]	0.61±0.380.18 / 0.52	Gandhi2019Atri2020
Orbital period (Porb) [h]	16.4518±0.0002	Torres2019
Peak X-ray flux [erg s-1 cm-2] [keV]	2.26E-07 [2-10]	Tucker2018
Outburst magnitude (AB)	V∼14	Tucker2018
Quiescent magnitude (AB)	V=18.3	Hambsch2019
E(B-V) [mag]	0.18	Tucker2018

Dynamically confirmed BH

NOTES

MAXI J1820+070: Kojiguchi2019 identified historic outburst in 1898 and 1934 through the analysis of photographic plates (suggesting a recurrence of 40 yr) and it showed rebrightenings in Jan 2019 (Russell2019c), Aug 2019 (Hambsch2019), Feb 2020 (Adachi2020) and Mar 2021 (Baglio2021)

Dynamical parameters

Orbital period [h]	16.4518±0.0002	Torres2019
Star's spectral type	K3 – 5	Torres2019
Star's radial velocity amplitude (K2) [km/s]	418±4	Torres2019
Mass function 'f(M1)' [M☉]	5.2±0.2	Torres2019
BH mass (M1) [M☉]	5.71 – 8.10 (8.40±0.770.70 if adopted i=63º)	Torres2020
Mass ratio (q=M2/M1)	0.07±0.01	Torres2020
Inclination angle (i) [deg]	>67 – 81 (or 63±3 for the orientation angle of the radio jet)	Torres2020Atri2020
Rot. broadening (v sini) [km/s]	84±5	Torres2020

Optical/NIR magnitudes

Mag. Outburst (AB) Tucker2018
V∼14	g’=13.14±0.03		i’=13.08±0.05
Mag. Quiescent (AB) Hambsch2019
	V=18.3

Aladin finding chart

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MAXI J1820+070 in Simbad

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Pan-STARRS1 finding chart

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