Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 5 · Portents, Comets
ग्रहचारः केतवश्च
भूसुता जलतैलाभा वर्तुलाः क्षुद्भयप्रदाः ।सुभिक्षक्षेमदाः श्वेतकेतवः सोमसूनवः ॥ १०१ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 101.
The sons of the Earth look like water or oil and are round. They bring fear of hunger. The white comets, sons of the Moon, bring plenty of food and welfare.
Simple meaning: Round comets born of the Earth can bring fear of hunger. White comets born of the Moon bring plenty.
पितामहात्मजः केतुस्त्रिवर्णस्त्रिदशान्वितः ।
Brahma's three-coloured comet, the Brahmadanda, is said to put many lives at risk.
ऐशान्यां भार्गवसुताः श्वेतरूपास्त्वनिष्टदाः ।
White comets of Venus in the north-east, and crestless comets of Saturn, bring bad results.
विकचाख्या गुरुसुता वेष्टा याम्ये स्थिता अपि ।
Jupiter's comets are bad even in the south. Small white comets of Mercury bring fear of thieves and illness.