GRO J1655-40
GRO J1655-40 is an X-ray binary star in the constellation Scorpius, about 10,440 light-years from Earth.
Black-hole binary with jets (a microquasar) in Scorpius
Facts
| Type | X-ray binary star (spectral type F3-6IV) |
|---|---|
| Constellation | Scorpius |
| Position (J2000) | 16h 54m 00s, −39° 50′ |
| Distance | 10,440 light-years (its light set off about 10,440 years ago) |
| Studied in | 1,998 scientific papers (SIMBAD) |
When and how to see it
GRO J1655-40 is highest in the sky at midnight in June. From India (about 20° N) it climbs to about 30° above the horizon; from 50° N it never rises.
Heights are worked out for India and for 50° N. Set your location in Settings to see them for where you are.
For tonight's best time from your own town, the darkness and the Moon, open it on the map and see its "Tonight from your location" card.
More in Scorpius
- Butterfly Cluster (M6)
- Butterfly Nebula
- Cat's Paw Nebula
- M4 (NGC 6121)
- M80 (NGC 6093)
- Prawn Nebula
- Ptolemy Cluster (M7)
- War and Peace Nebula
Everything in Scorpius · All 88 constellations · All sky objects
Data: SIMBAD (CDS, Strasbourg; the site's weekly copy) · Data sources & credits