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

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ID# 66

MAXI J0637-430

( Russell2019d )

RA     [J2000]     DEC

[]          []

06:36:23.70  -42:52:04.70

ℓ                      b

[deg]                            [deg]

251.5320370  -20.67473903

Year of discovery: 2019  
( Negoro2019c )

# of outbursts after discovery:

Basic data

Distance [kpc]
Distance to the plane (z) [kpc]
Orbital period (Porb) [h]
Peak X-ray flux [erg s-1 cm-2]
Outburst magnitude (AB) r’=15.80±0.01 Baglio2020 Murata2019
Quiescent magnitude (AB) i’>20.7 Johar2020
E(B-V) [mag] 0.064 – 0.12 Kennea2019 Strader2019
Spectral type


MAXI J0637-430 showed at least 1 rebrightening during the decay ( Baglio2020 ).
The true quiescent magnitudes are unknown but the system is not detected by LCO and Faulkes since MJD58999 ( Johar2020 ). Lower limits of the quiescent magnitudes are shown for completeness.
From the state-transition luminosity and the inner edge of the accretion flow in X-rays, Jana2021 estimate the mass of the black hole to be in the range of 5 - 12 M, assuming the distance is <10 kpc.

Optical/NIR magnitudes

Mag. Outburst (AB)
Baglio2020 Murata2019
u∼14.9 g’=16.078±0.08 r’=15.80±0.01
J=17.40±0.01 H=17.69±0.02 Ks=17.96±0.05
Mag. Quiescent (AB)
i’>20.7 z’>>18.3
Additional information
Light Curve by XB-NEWS ( Russell2019 )
Aladin finding chart
Scroll to zoom. Set survey image in "Manage layers"
Default image: DSS2 Red
MAXI J0637-430 in Simbad

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.