RX Telescopii is an irregular variable star in the constellation Telescopium. It has a maximum magnitude of 6.45 and a minimum magnitude 7.47. It is a red supergiant with a spectral type of M3Iab, indicating the star is an intermediate-size luminous supergiant star. The distance to RX Telescopii is uncertain. It has a

Gaia Data Release 2 The ''Gaia'' catalogues are star catalogues created using the results obtained by ''Gaia'' space telescope. The catalogues are released in stages that will contain increasing amounts of information; the early releases also miss some stars, especia ...

parallax of , suggesting a distance around . A more rigorous statistical calculation gives a distance of , suggesting a radius of using an angular diameter of , which would make it one of the largest stars discovered and its photosphere engulf the orbit of Jupiter, and nearing that of Saturn if it was placed in the Solar System. However the Gaia database has an astrometric noise value larger than the parallax itself and about ten times larger than the typical maximum for a reliable parallax, thus this distance, hence the radius, are inaccurate.

Gaia EDR3 The ''Gaia'' catalogues are star catalogues created using the results obtained by ''Gaia'' space telescope. The catalogues are released in stages that will contain increasing amounts of information; the early releases also miss some stars, especia ...

published a parallax of , corresponding to a much smaller radius of using the angular diameter.

References

{{DEFAULTSORT:RX Telescopii Telescopium Slow irregular variables Telescopii, RX M-type supergiants Durchmusterung objects 177456 TIC objects