Indra's bow, the rainbow; the fourth Sun-derived upagraha
Meaning
Indrachapa is the fourth of the Sun-derived upagrahas: subtract Parivesha from 360 degrees and the result is Indrachapa, Indra's bow, the rainbow. It is malefic, though of the five it is the one the texts treat most mildly, and it is read for the bhava it occupies.