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Caput Trianguli, Metallah, Ras al Mothallah,
Alpha Trianguli, 2 Trianguli

Proper NamesMothallah, Caput Trianguli, Metallah, Ras al Mothallah
Bayer DesignationAlpha Trianguli
Flamsteed Number2 Trianguli
HR (BSC)544
Right Ascension1h 53m 5s
Declination+29° 34' 44"
Distance63 light years
19 parsecs
MagnitudeApparent: +3.4
Absolute: +2.0
Spectral ClassF5III Bright Yellow Giant
Optimum VisibilityOctober / November

This orange subgiant, about 63 light years from Earth, takes its name from the Arabic al muthallath, meaning 'the Triangle' and, despite its 'Alpha' designation, is the second brightest star in the northern constellation of that name. Given its triangular associations, it is appropriate that Mothallah is a ternary or triple system, with the main star having two companions.

Imagery provided by Aladin sky atlas


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