Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 5 · Portents, Comets
ग्रहचारः केतवश्च
कुजात्मजाः कुंकुमाख्या रक्ताः शूलास्त्वनिष्टदाः ।अग्निजा विश्वरूपाख्या अग्निवर्णाः सुखप्रदाः ॥ १०५ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 105.
Mars's sons are called Kumkuma. They are red and shaped like spears, and bad. The sons of Agni are called Vishvarupa. They are fire-coloured and bring comfort.
Simple meaning: Red spear-shaped comets of Mars are bad. Fire-coloured comets of Agni bring comfort.
अरुणाः श्यामलाकारा अर्कपुत्राश्च पापदाः ।
Dusky comets of the Sun are bad. Star-like comets of Venus are good.
कृत्तिकासु भवो धूमकेतुर्नूनं प्रजाक्षयः ।
A comet in Krittika can mean loss of people. One on palaces or trees can harm kings.
सुभिक्षकृत्कौमुदाख्यः केतुः कुमुदसन्निभः ।
The lily-white Kaumuda comet brings plenty. The Avarta comet at twilight is not good.