Coordinates

RA: 18^h02^m41^s.937
DEC: -20^∘17'0017''.4
Position-uncertainty [arcsec]: 1.371 × 10^-4
Galactic-longitude [deg]: 9.42
Galactic-latitude [deg]: 1.04
Coordinate-Reference

Binary System

Alternative Name: IGR J18027-2017
X-ray Type: BE,CL,EB,QPO,SG,XP,XT
Mean Distance [kpc]: 5.68
Distance Range [kpc]: 0.97 - 12.65

Compact Object

Mean Mass[M_☉]: 1.57^[1]
Mass Range [M_☉]: 1.32 - 1.82^[1]
Orbital Period [d]: 4.57^{[1][2][3][4][5]}
Pulse Period [s]: 139.6^[1][2][3][4]
CRSF energy [keV]: 24^[1]
XMM-Newton flux [10^-12 erg cm^-2 s^-1]:10.96 - 53.38 (0.2-12.0 keV)
Swift/XRT flux [10^-12 erg cm^-2 s^-1]:0.0 - 56.21 (0.3-10.0 keV)
Swift/BAT flux [10^-12 erg cm^-2 s^-1]:84.45 (14-195 keV)

Optical Counterpart

Gaia DR3 Name: 4070968778561141760
Counterpart: confirmed
Spectral Type: B1Ib^[1][2]
G [mag]: 16.802(0.004)
J [mag]: 12.72(0.04)
H [mag]: 11.90(0.04)
K [mag]: 11.474(0.032)
W1 [mag]: 10.982(0.009)
W2 [mag]: 10.990(0.007)
Effective stellar temperature [K]: 5179.7

Other references

2004AstL...30..382R