Coordinates
RA: 15h42m23s.352
DEC: -52∘23'09''.643
Position-uncertainty [arcsec]: 1.439 × 10-5
Galactic-longitude [deg]: 327.42
Galactic-latitude [deg]: 2.16
Coordinate-Reference
Binary System
Alternative Name: 4U 1538-522
X-ray Type: CL,EB,SG,XP
Mean Distance [kpc]: 5.99
Distance Range [kpc]: 5.09 - 6.84
Hydrogen Column density [1021 cm−2]: 46.0
Compact Object
Mean Mass[M☉]: 1.02[1]
Mass Range [M☉]: 0.85 - 1.19[1]
Orbital Period [d]: 3.73[1][2][3]
Pulse Period [s]: 526.42[1]
CRSF energy [keV]: 22,47[1][2][3]
XMM-Newton flux [10-12 erg cm-2 s-1]:40.78 (0.2-12.0 keV)
Chandra flux [10-12 erg cm-2 s-1]:2.68 (0.5-7.0 keV)
Swift/XRT flux [10-12 erg cm-2 s-1]:271.9 (0.3-10.0 keV)
Swift/BAT flux [10-12 erg cm-2 s-1]:328.27 (14-195 keV)
Optical Counterpart
Gaia DR3 Name: 5886085557746480000
Counterpart: confirmed
Spectral Type: B0 Iab[1][2]
G [mag]: 13.1637(0.0031)
V [mag]: 14.5
J [mag]: 10.358(0.025)
H [mag]: 9.910(0.023)
K [mag]: 9.677(0.022)
W1 [mag]: 9.215(0.010)
W2 [mag]: 9.257(0.008)
Effective stellar temperature [K]: 5980.2
Stellar Luminosity [L☉]: 2698.0
