QX Normae

QX Normae is an active low mass X ray binary in the constellation Norma. It is composed of a neutron star and a star smaller and cooler than the Sun. The X-ray component, known as 4U 1608–52, was discovered in the early 1970s, while the visual component, QX Normae, was discovered in 1977.^[3] By analysing the interstellar extinction between Earth and the system, Güver and colleagues calculated the most likely distance to be 5.8 kpc (19,000 light-years), and the neutron star's mass to be 1.74 ± 0.14 times that of the Sun and radius to be a mere 9.3 ± 1.0 km.^[2]

QX Normae

Observation data Epoch J2000      Equinox J2000
Constellation	Norma
Right ascension	16h 12m 43.0s[1]
Declination	−52° 25′ 23″
Astrometry
Distance	19,000 ly (58,000[2] pc)
Details
Neutron star
Mass	1.74 ± 0.14[2] M☉
Radius	9.3 ± 1.0[2] km
Other designations
4U 1608-52[1]
Database references
SIMBAD	data