Del-1

Hot blue star

Its story

Delta-1 Telescopii is a B6 blue subgiant locked in a spectroscopic pair with a companion invisible to telescopes: only the periodic shift of her spectral lines reveals it. She shines with the strength of some 800 Suns at 708 light-years, in a constellation Lacaille invented in the 18th century to honour the instrument then revolutionising astronomy. Fitting: she is hotter than any glass could bear.

Constellation: Telescopium
Apparent magnitude: 4.92
Distance: 707.6 light years
Coordinates (J2000): RA 277.939° · Dec -45.915°
Catalogue: HIP 90830 · HD 170465

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