Rishi: Traditionally affiliated with the Agnicayana mantra-stream (Yājñavalkya lineage in Śukla transmission; specific ṛṣi as per Anukramaṇī not supplied in input)
Devata: Āditya / Agni as the garbha within the altar-body
Chandas: Triṣṭubh (by cadence and pāda-length typical of this Agnicayana set)
Anoint with milk the Āditya-embryo, the universal-formed image of the thousand. Encompass it with glowing ardour; press not upon me: as thou art being built up, make it of a hundred years’ duration.