Brihat Samhita
नातिव्यक्ताः सूक्ष्मा दीर्घाः शुक्ला यथाइष्टदिक्प्रभवाः । बुधजास्तस्करसंज्ञाः पापफलास्त्वेकपञ्चाशत् ॥ ११-२० ॥
The comets that are neither very bright nor clearly visible to the naked eye, and that are long and white are named Taskara Ketus; they are the sons of Mercury, they appear anywhere and are 51 in number; when they appear mankind will feel miserable.
english translation
nAtivyaktAH sUkSmA dIrghAH zuklA yathAiSTadikprabhavAH । budhajAstaskarasaMjJAH pApaphalAstvekapaJcAzat ॥ 11-20 ॥
hk transliteration by Sanscript