Ketu is not actually is planet or a visible body in the sky. It is a shadow planet. Ketu is also called the dragon’s tail. The motion of Ketu in kundali is in opposite direction than the other planets.
Ketu takes a person away from material pleasures. It take a person on the path of virakti. Ketu is favorable for meditation and spiritual progress.
Rashis ruled by Ketu: –
Ketu Exaltation Rashi : Scorpio
Ketu Debilitation Rashi : Taurus
Nakshatras ruled by Ketu : Ashwini, Magha, Mool
Ketu is karaka for : Virakti
Friends : Mars, Venus, Saturn
Neutral: Mercury, Jupiter
Enemies: Sun, Moon
Unfavorable rashis: G
Gemstone: Lasuniya (Cat’s Eye )
Numbers ruled by Ketu: 7