| Terzan 1 | |
| Epoch: | J2000 |
| Constellation: | Scorpius |
| Ra: | [1] |
| Names: | ESO 455-23, Cl Haute-Provence 2, Cl VDBH 235, [KPS2012] MWSC 2635, C 1732-304, Cl Terzan 1, GCl 69 |
Terzan 1 also known as ESO 455-23 and Terzan 1966, is a heavily obscured globular cluster located around 20.000 light-years from Earth in the constellation of Scorpius.
It is one of about 150 globular clusters discovered by the French astronomer Agop Terzan in the 1960s-70s, belonging to the Milky Way. Terzan 1 is also an X-ray source.
Terzan 1 has the smallest projected distance to the Milky Way’s center among all known globulars: is only 4,200 light-years from the center but 21,800 light-years from Earth.
In 1980, astronomers detected X-ray bursts from a source located in Terzan 1. Several years later, the source X1732-304 was detected within the cluster with NASA’s Spacelab 2 and ESA’s EXOSAT missions.[2]