Brihat Samhita
ध्रुवकेतुरनियतगतिप्रमाणवर्णऽकृतिर्भवति विष्वक् । दिव्यान्तरिक्षभौमो भवत्ययं स्निग्ध इष्टफलः ॥ ११-४१ ॥
Dhruva Ketu is a comet possessing no fixed course, colour or shape and appears anywhere in the heavens, in the sky and on Earth. When it appears glossy, mankind will be happy.
english translation
dhruvaketuraniyatagatipramANavarNa'kRtirbhavati viSvak । divyAntarikSabhaumo bhavatyayaM snigdha iSTaphalaH ॥ 11-41 ॥
hk transliteration by Sanscript