Who is the wife of Prabhas & the mother of Vishwakarma?

Question

The Harivamsha states that Brihaspati’s sister was a beautiful lady who became the wife of the eighth Vasu, Prabhas & Vishvakarma was born from her!

Brihaspati’s sister was a beautiful lady who practised brahmacharya. She became successful through yoga and roamed around the entire universe, bereft of attachment. She became the wife of the eighth Vasu, Prabhasa. The immensely fortunate Prajapati Vishvakarma was born from her.

Remembering another story, Prabhas was also the Vasu who got cursed by Vasishth to be born on earth because of his wife's insistence on him stealing the Brahmarishi's cow so this lady could be the one behind that prank.

So my question is - Who is this lady & is she really the mother of Vishwakarma?

Answer 1

This chapter Vishnu Purana calls her Yogasiddha:

The sister of Váchaspati, lovely and virtuous, Yogasiddhá, who pervades the whole world without being devoted to it, was the wife of Prabhása, the eighth of the Vasus, and bore to him the patriarch Viswakarmá, the author of a thousand arts, the mechanist of the gods, the fabricator of all ornaments, the chief of artists, the constructor of the self-moving chariots of the deities, and by whose skill men obtain subsistence.

The part about pervading the world is connected to Vedic hymns like this one that describe the wife of Dyaus Pita/Prabhasa as Prithvi or Earth. (I'm not sure how it relates with Bhudevi being a wife of Vishnu.) And Vachaspati is another name for Brihaspati.

This chapter of the Srimad Bhagavatam calls her Angirasi:

From Āṅgirasī, the wife of the Vasu named Vāstu, was born the great architect Viśvakarmā.

Angirasi denotes that she is the daughter of Angirasa, the father of Brihaspati. And Vastu is yet another name for Dyaus Pita/Prabhasa.