Rishi: Traditionally attributed within the Uṣas-hymn sphere (Ṛgvedic provenance); in VS usage treated as śruti-mantra without separate r̥ṣi-citation in many prayogas
Devata: Uṣas (Dawn)
Chandas: Gāyatrī (by pāda-length and cadence in the underlying Ṛgvedic model)