Rishi: Atri (probable, as the hymn repeatedly references Atraye; traditional attribution to Atri or Atris in Aśvin hymns)
Devata: Uṣas (Dawn) explicitly; refrain still addresses a dual ‘vām’ (Aśvinau) suggesting shared hymn-refrain or mixed address
Chandas: Gāyatrī (probable: short refrain-like structure; exact meter requires full hymn scan)
Samhita Patha (Devanagari)अरुणप्सुरुषा अभूदकर्ज्योतिॠतावरी । अन्ति षद्भूतु वामवः ॥
Recitation with translationRig Veda 8.73.16
Transliterationaruṇápsur uṣā́ abhūd ákar jyótir ṛtā́varī | ánti ṣádbhūtu vāmávaḥ ||
Translationअरुणप्सुरुषा ऋतावरी ज्योतिरकार्षीत्। वामवोऽन्ति षद्भूतु सत्यरूपेणोपस्थितम्।
Word by Wordअरुणप्सुःthe ruddy (one) in the waters (i.e., dawn/fire in waters) उरुषाःwide-spreading, far-reaching अभूत्became; came into being अकःa ray; a flash (of light) ऋतावरीshe who bears/advances ṛta (cosmic order); the ṛta-bearing (one) अन्तिnear; in the presence (of) षत्let (him/it) sit; may (it) settle भूतुlet it be; may it become वामवःa gracious boon; a favorable good (gift) 
