Iota1 Librae

Its magnitude of 4.5 means that naked-eye visibility is dependent on a sky sufficiently free from the effects of light pollution.

The best time for observation in the evening sky falls in the months between May and September; from both hemispheres of the period of visibility remains approximately the same, thanks to the position of the star not far from the celestial equator.

[3] The inner pair, designated components Aa and Ab, form a spectroscopic binary with an orbital period of 22.35 years and an eccentricity of 0.35.

[5] The brighter member has a stellar classification of B9 IVp Si,[3] indicating it is a B-type subgiant star with an overabundance of silicon in the photosphere.

[9][10] A third component is located 57 arcsec distant; it is a star of the tenth magnitude, Iota1 Librae B.

A light curve for Iota 1 Librae plotted from STEREO data, adpated from Wraight et al. (2012) [ 7 ]