with a period of 505 days. This is an unusually close distance from the star, within a range that has been termed the brown-dwarf desert. Black hole Telescopium is also host to the first known visible star system with a black hole. QV Telescopii, also designated HR 6819, is a triple star system, which is visible to the unaided eye as a variable star with apparent magnitude 5.32 to 5.39. It is located in Telescopium near its SW corner with Ara and Pavo. The hierarchical triple star system consists of two B-type giant stars, the inner with spectral types B3III and the outer Be, as well as one unseen stellar-mass companion in the inner binary with an orbital period of 40.33 days. This unseen companion is inferred to be a non-accreting stellar-mass black hole of at least 4 . At a distance of approximately 1,120 light-years, QV Telescopii is, , the closest known black hole to Earth and the only known visible star system to contain a black hole. Deep sky objects The Telescopium group is group of twelve galaxies spanning three degrees in the northeastern part of the constellation, lying around 37 megaparsecs (120 million light-years) from our own galaxy. The brightest member is the elliptical galaxy NGC 6868, and to the west lies the spiral galaxy (or, perhaps, lenticular galaxy) NGC 6861. These are the brightest members of two respective subgroups within the galaxy group, and are heading toward a merger in the future. The globular cluster NGC 6584 lies near Theta Arae and is 45,000 light-years distant from Earth. It is an Oosterhoff type I cluster, and contains at least 69 variable stars, most of which are RR Lyrae variables. The planetary nebula IC 4699 is of 13th magnitude and lies midway between Alpha and Epsilon Telescopii. IC 4889 is an elliptical galaxy of apparent magnitude 11.3, which can be found 2 degrees north-north-west of 5.3-magnitude Nu Telescopii. Observing it through a 40 cm telescope will reveal its central region and halo. Occupying an area of around 4' × 2', NGC 6845 is an interacting system of four galaxies—two spiral and two lenticular galaxies—that is estimated to be around 88 megaparsecs (287 million light-years) distant. SN 2008da was a type II supernova observed in one of the spiral galaxies, NGC 6845A, in June 2008. SN 1998bw was a luminous supernova observed in the spiral arm of the