Rishi: Bhṛgu-lineage (traditional attribution via internal mention of Bhṛgavaḥ); in Śukla-Yajurvedic liturgical use, treated as a received ṛṣi-tradition rather than a single author
Devata: Agni (as Hotṛ and first-established fire)
Chandas: Triṣṭubh (by RV-parallel cadence and length; confirmable by full metrical scan in RV source)