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

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ID# 2

4U 1630-472

Nor X-1

( Buxton1998 )

RA     [J2000]     DEC

[]          []

16:34:01.61  -47:23:34.80

ℓ                      b

[deg]                            [deg]

336.9112429  +00.25029536

Year of discovery: 1969  
( Giacconi1972 Priedhorsky1986 )

# of outbursts after discovery: >20

Basic data

Distance [kpc] 4.7-11.5 Kalemci2008
Distance to the plane (z) [kpc] 0.02 – 0.05 Kalemci2008
Orbital period (Porb) [h]
Peak X-ray flux [erg s-1 cm-2]
Outburst magnitude (AB) K (not AB)=16.1 Augusteijn2001
Quiescent magnitude (AB)
E(B-V) [mag] 4.2 Callanan2000
Spectral type


4U 1630-472: The peak X-ray flux was obtained from the 2003 outburst ( Tomsick2005 ) , the brightest one detected so far. It has shown quasi-periodic outburst with recurrence times of ∼600-700 d and durations of 100-200 d ( Kuulkers1997 ). The K-band magnitude was not transformed into AB system.

Optical/NIR magnitudes

Mag. Outburst (AB)
K (not AB)=16.1
Mag. Quiescent (AB)
Aladin finding chart
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4U 1630-472 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.