Telescopium also hosts the first known visible star system with a black hole, QV Telescopii (HR 6819), which appears as a variable star with magnitude 5.32 to 5.39. ==History== Telescopium was introduced in 1751–52 by Nicolas-Louis de Lacaille with the French name le Telescope, depicting an aerial telescope, after he had observed and catalogued 10,000 southern stars during a two-year stay at the Cape of Good Hope.
Lacaille had Latinised its name to Telescopium by 1763. The constellation was known by other names.
Johann Bode called it the Astronomische Fernrohr in his 1805 Gestirne and kept its size, but later astronomers Francis Baily and Benjamin Gould subsequently shrank its boundaries.
The system is complex, as it has a common proper motion with (and is gravitationally bound to) the star HD 181327, which has its own debris disk.
HD 191760 is a yellow subgiant—a star that is cooling and expanding off the main sequence—of spectral type G3IV/V.
The three-letter abbreviation for the constellation, as adopted by the International Astronomical Union in 1922, is "Tel".
The official constellation boundaries, as set by Belgian astronomer Eugène Delporte in 1930, are defined by a quadrilateral.
Later this will become an extreme helium star before cooling to become a white dwarf. While RR Telescopii, also designated Nova Telescopii 1948, is often called a slow nova, it is now classified as a symbiotic nova system composed of an M5III pulsating red giant and a white dwarf; between 1944 and 1948 it brightened by about 7 magnitudes before being noticed at apparent magnitude 6.0 in mid-1948.
RR Telescopii is a cataclysmic variable that brightened as a nova to magnitude 6 in 1948.
Later this will become an extreme helium star before cooling to become a white dwarf. While RR Telescopii, also designated Nova Telescopii 1948, is often called a slow nova, it is now classified as a symbiotic nova system composed of an M5III pulsating red giant and a white dwarf; between 1944 and 1948 it brightened by about 7 magnitudes before being noticed at apparent magnitude 6.0 in mid-1948.
First discovered in 1952, it was found to have a very low level of hydrogen.
SN 1998bw was a luminous supernova observed in the spiral arm of the galaxy ESO184-G82 in April 1998, and is notable in that it is highly likely to be the source of the gamma-ray burst GRB 980425.
SN 2008da was a type II supernova observed in one of the spiral galaxies, NGC 6845A, in June 2008.
Dipping from its baseline magnitude of 9.6 to 16.5, RS Telescopii is a rare R Coronae Borealis variable—an extremely hydrogen-deficient supergiant thought to have arisen as the result of the merger of two white dwarfs; fewer than 100 have been discovered as of 2012.
As of 2012, four dimmings have been observed.
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