KETU I (KETUMĀN). A Dānava. He was the son of Kaśyapa (grandson of Brahmā and son of Marīci) by his wife Danu. This Asura, who exists in the shape of a planet had thirtythree brothers, i.e. Vipracitti, Śambara, Namuci, Pulomā, Asilomā, Keśī, Durjaya, Ayaśśiras, Aśvaśiras, Aśva, Śaṅku, Mahābala, Garga, Amūrdhan, Vegavān, Mānavān, Svarbhānu, Aśvapati, Vṛṣaparvan, Ajaka, Aśvagrīva, Sūkṣma, Tuhuṇḍa, Ekapāt, Ekacakra, Virūpākṣa, Harāhara, Nikumbha, Kapaṭa, Śarabha, Śalabha, Sūrya and Candramas.
[Ādi Parva, Chapter 65] . But Ketu maintained closer relationship with Rāhu, a step-brother of his, being the son of Kaśyapa by another wife called Siṁhikā. Rāhu and Ketu are even today considered as inauspicious planets. Rāhu wears a half-moon and Ketu holds in his hands a sword and lamp. Amitaujas was Ketu reborn.
[Ādi Parva, Chapter 67, Verse 11] .
KETU II A great sage of ancient India. He attained salvation by self-study.
[Śānti Parva, Chapter 26, Verse 7] .
KETU III A synonym of Śiva.
[Anuśāsana Parva, Chapter 17, Verse 38] .
KETU IV A King born in Bharata's dyanasty.
[Bhāgavata, 9th Skandha] .
KETU V (DHŪMAKETU). The following story is told in Viṣṇudharmottara Purāṇa about the birth of Dhūmaketu. Noting that the population on earth had increased abnormally Brahmā created a damsel called Mṛtyu and asked her to kill people. At this command of Brahmā she began crying, and from her tear drops various kinds of diseases originated at the sight of which she took to penance. Then Brahmā appeared and blessed her saying that no one would die because of her at which she heaved a great sigh of relief from which was born Ketu or Dhūmaketu.