He was the son of Kasyapa (grandson of Brahma and son of Marici ) by his wife Danu. This Asura, who exists in the shape of a planet had thirtythree brothers, i.e.
Vipracitti, Sambara, Namuci, Puloma, Asiloma, Kesi, Durjaya, Ayassiras, Asvasiras, Asva, Sanku, Mahabala, Garga, Amurdhan, Vegavan, Manavan, Svarbhanu, Asvapati, Vrsaparvan, Ajaka, Asvagriva, Suksma, Tuhunda, Ekapat, Ekacakra, Virupaksa, Harahara, Nikumbha, Kapata, Sarabha, Salabha, Surya and Candramas.
(Adi Parva, Chapter 65) .
Ketu maintained closer relationship with Rahu, a step-brother of his, being the son of Kasyapa by another wife called Simhika. Rahu and Ketu are even today considered as inauspicious planets. Rahu wears a half-moon and Ketu holds in his hands a sword and lamp. Amitaujas was Ketu reborn.
(Maha-bharata Adi Parva, Chapter 67, Verse 11).
Also see “Candra”
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