High Quality Content by WIKIPEDIA articles! Sagittarius XR-5 or Sgr XR-5 is the fifth extrasolar X-ray source believed to be in the constellation Sagittarius detected by a research group at the Naval Research Laboratory using a sounding rocket. Sgr XR-5 is at J1950 RA 18h 26m Dec -13°. Sgr XR-5 is actually in the constellation Scutum. Sgr XR-6 current position is within NGC 6530 a star cluster, which is a bipolar nebula in Messier 8 (Lagoon Nebula), containing known X-ray sources.