Brihat Samhita
श्यामारुणा विताराश्चामररूपा विकीर्णदीधितयः । अरुणाख्या वायोः सप्तसप्ततिः पापदाः परुषाः ॥ ११-२४ ॥
The comets that are dark-red in colour, without disc, presenting the appearance of Cāmara and with scattered rays are named Aruṇa Ketus. They are the sons of Vāyu (the wind) and are 77 in number; when they appear mankind will feel miserable.
english translation
zyAmAruNA vitArAzcAmararUpA vikIrNadIdhitayaH । aruNAkhyA vAyoH saptasaptatiH pApadAH paruSAH ॥ 11-24 ॥
hk transliteration by Sanscript