Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 5 · Portents, Comets
ग्रहचारः केतवश्च
वंसुकबिंबक्षितिजच्छुकतुंडादिसन्निभाः ।हुताशनोदितास्तेऽपि केतवः फलदाः स्मृताः ॥ १०० ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 100.
Some look like the bandhuka flower, the bimba fruit, blood or a parrot's beak. These comets, born of fire, are also said to give results.
Simple meaning: Red comets like flowers, fruit, blood or a parrot's beak are born of fire and give results.
भूसुता जलतैलाभा वर्तुलाः क्षुद्भयप्रदाः ।
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.