On page 24, the star appears to be confused, and the length of day is wrong. An Auroran day is ca. 61 standard hours (Aurore SB, pg 66 and elsewhere).
Aurore orbits the Brown Dwarf Tithonus, which orbits the barycentre of Muphrid (luminosity 6.5 Sols) and Rubris (luminosity 0.04) at 5.85 AU*. The majority of sunlight (> 99%) comes from Muphrid. Rubris doesn't matter.
* Of course, this means Aurore only gets 19% of the sunlight of Earth from their stars. Tithonus has a given luminosity of 0.00003 of Sol, but is so close it illuminates Aurore at 78% of Earth, giving 97% of Earth. However, Aurore is tidally locked to Tithonus. Due to the Barycentre, Murphid is +/- 0.22 AU in distance and so the actual variation is 17.6 to 20.5% of Sol, and so the insolation varies from 96 to 100% of Sol.
Tithonus glows roughly "light cherry red" and in the colonial areas at night there is a dim red illumination, and in day (when Muphrid, a yellow star, is overhead) it gets slightly lighter and oranger. Living on Aurore means living under dim red light except when artificial illumination is used.