LS 5039

LS 5039, also known under the designation V479 Scuti variables (short: V479 Sct ), is a massive X-ray binary and microquasar in the constellation sign.

The system consists of a compact object and a blue giant of spectral type O, which revolve around one another in a narrow orbit in just under 4 days. The exact nature of the compact object in LS 5039 is still the subject of research; it could be a black hole or a neutron star. The system is a source of X-rays and gamma rays with energies up to the TeV range.