Purāṇas · c. 9th-10th c. CE
उत्तराहनावगस्तिरधराहनौ यमो मुखेषु चाङ्गारक: शनैश्चर उपस्थे बृहस्पति: ककुदि वक्षस्यादित्यो हृदये नारायणो मनसि चन्द्रो नाभ्यामुशना स्तनयोरश्विनौ बुध: प्राणापानयो राहुर्गले केतव: सर्वाङ्गेषु रोमसु सर्वे तारागणा: ॥ ७ ॥
And on the upper jaw of the Sisumara is Agastya, and on its lower jaw is Yama. — J.M. Sanyal (1930s; public domain)
Bhāgavata 5.23.7 pairs Yama on the lower jaw directly against Agasti (Canopus) on the upper. Since Agastya is securely Canopus and the two jaws are adjacent, a southern-sky star is implied, but the text names none and no reliable identification was found. Yama as an asterism-deity (of Bharaṇī) is a separate usage; this is a distinct sky-position.
Bhāgavata Purāṇa 5.23.7 · text · translation