Telescopium is a small constellation in the southern hemisphere. It was introduced by the French astronomer Nicolas Louis de Lacaille in the 18th century. Its name means "telescope" in Latin.
Telescopium is usually depicted as an aerial telescope, a long refractor suspended from a pole. The constellation originally extended between the constellations Sagittarius
, but today only encompasses the area south of Sagittarius
and Corona Australis
and no longer contains the stars that Lacaille designated beta Telescopi, gamma Telescopii, and theta Telescopii. These are now 
eta Sagittarii, 
G Scorpii and 
45 Ophiuchi respectively.
The constellation Telescopium occupies an area of 252 square degrees and does not contain any stars with known planets. It can be seen at latitudes between +40° and -90° and is best visible at 9 p.m. during the month of August.
There are no stars brighter than fourth magnitude in Telescopium. The brightest star in the constellation is 
alpha Telescopii, a blue-white subgiant lying about 249 light-years from Earth.
zeta Telescopii, the second brightest star, is a yellow giant approximately 127 light-years distant.
epsilon Telescopii, the third brightest star in the constellation, is a binary system located 409 light-years from Earth. It consists of an orange giant and a magnitude 13 companion star.
delta Telescopii is another interesting binary star system. It consists of a blue-white subgiant 800 light-years distant and a blue-white giant about 1100 light-years distant.
Another notable star is 
xi Telescopii, a red bright giant about 1254 light-years distant. It has an apparent magnitude of 4.93 and is an irregular variable star.
Telescopium also contains a notable globular star cluster, NGC 6584 (Bennett 107). Bennett 107 is a large, bright cluster that consists of a number of magnitude 15 stars. It can be spotted on the western border of the constellation.
Telescopium belongs to the Lacaille family of constellations, along with Norma
Constellations directly bordering Telescopium are Ara
, Corona Australis