Ketu is very peculiar graha. Ketu is chaya Graha (shadow planet), meaning it does not have a body. It is the south node of the Moon. What does a node of the Moon mean? Moon represents manas (mind) so these nodes work on the mind. They do not have a body. Body or form comes from Agni, that is why there are only 7 days in week representing the 7 body planets.
Let us understand Ketu, he lords over two zodiac signs, Scorpio and Pisces. Scorpio is the home (sva-kshetra) and Pisces is the office (Mula-trikona) of Ketu. Scorpio is the natural 8th signs and maps into the 8th house. This is the house of transformation. We have to undergo transformation to become spiritual. That is why Ketu exalts in the natural 9th house of Sagittarius, which temple or priest. The office of Ketu is the natural 12th house of Moksha. That is why Ketu is called Moksha Karaka i.e. significator of salvation. That is the nature of Ketu, It has the energy of 8th house and 12th house. 8th house is transformation, which can be quite painful. The energy of the 12th house is going away or giving up. We can easily give up things like a sanyasi or we get losses due to this effect.
Remedies For Ketu
One of the best remedies of Ketu is to follow a spiritual path. Ketu gets positive my daily spiritual practice, like chanting your mantras daily etc.
Ganesha Mantra
The devata that controls Ketu is Ganesha. Worship of Ganesha or doing mantra of Ganesh is very good. A simple Ganesh mantra can help to pacify malefic Ketu.
Saptakshari Mantra
ॐ गणेशाय नमः। om gaṇeśāya namaḥ |
Vighneshwara Mantra Shodasakshari
ॐ गं ग्लौं गणपतये विघ्नविनाशीने स्वाहा। om gaṁ glauṁ gaṇapataye vighnavināśīne svāhā |
These two are very beautiful, mantras of Ganesha can be done for better results and making life easy.
Matsya Avatar
Lord Vishnu took the Avatar of Shri Matysa, which is from Ketu. Worship of Shri Matsya Avatar removes suffering caused by Ketu. Worship of Shri Matsya is done with a lot of rules and require utmost purity. Reading Matsya Puran can be done.
Veda Murti
Veda Murti Mantra, Veda Murti from D60 (Shastiamsa Chart) can be calculated and should be worshipped every day to remove the blockage of knowledge and have the protection of Guru.
Dhoomvati
Mahavidhya of Ketu is Dhoomavati. She is worshipped to make Ketu strong, prevent bad results from Neecha Ketu. Mahavidhya worship should be done under the proper supervision of a Jyotish.
Dhoomavati Jyestha Mantra
धुं धुं धुमावती स्वाहा। dhuṁ dhuṁ dhumāvatī svāhā |
Ketu Graha Mantra
Ketu Graha mantra can be done every day to pacify the graha.
Dasakshari Mantra
ॐ त्रां त्रीं त्रौं सः केतवे नमः। om trāṁ trīṁ trauṁ saḥ ketave namaḥ |
Other remedies
- Donation to Saints.
- Feeding Dogs and Fishes
- Visit Shri Jagannath Puri.
- Keeping the Roof of your house clean.
Vedic Akshat 
Chongman zhihui
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