Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 5 · Portents, Comets
ग्रहचारः केतवश्च
अनिष्टदो धूमकेतुः शक्रचापसमप्रभः ।द्वित्रिचतुःशूलरूपः स च राज्यांतकृन्मतः ॥ ९८ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 98.
The smoke comet is bad. Its light is like Indra's bow. It has two, three or four spear shapes. It is held to bring harm to a kingdom.
Simple meaning: The smoke comet is bad and can bring harm to a kingdom.
मणिहारस्तुवर्णाभा दीप्तिमंतोऽर्कसूनवः ।
Bright gold-like comets born of the Sun, seen in the east or west, can bring loss to kings.
वंसुकबिंबक्षितिजच्छुकतुंडादिसन्निभाः ।
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.