RX J1856.5−3754
Star
RX J1856.5−3754 is a neutron star in the constellation Corona Australis. At approximately 400 light-years from Earth, it is the closest neutron star discovered to date. Wikipedia
Magnitude: 25.7
Distance to Earth: 400 light years
Constellation: Corona Australis
Mass: 0.9 M☉
Radius: 19–41 km
Age: 1 Myr
Apparent magnitude (V): 25.7