Mothallah

Alp

Variable star

Its story

Mothallah is the alpha of Triangulum, one of the smallest and most ancient constellations, already catalogued by Ptolemy in the second century. Its Arabic name, «Al-Muthallath», simply means «the triangle», naming both the figure and its leading star. At 63 light-years, it is a gentle F-type variable: a yellow-white flame whose brightness shifts almost imperceptibly. In the same patch of sky lies an entire spiral galaxy, M33, neighbour of Andromeda and silent witness to the flow of cosmic time.

Constellation: Triangulum
Apparent magnitude: 3.42
Distance: 63.3 light years
Coordinates (J2000): RA 28.270° · Dec 29.579°
Catalogue: HIP 8796 · HD 11443

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