Nava means nine, graha means the planets ruling Lords. This is a rare pooja, helping people carrying a special, unique life story. Helps to clean our karma, to release our blocks. Removes some special obstacles, helps to get out from suffering.
Those who get this mantra ceremony from their palm leaf can do something important in spirituality. They have a good chance of becoming a healer.

Sources & References: This mantra lasts for 9 Sundays, with a different mantra for each week

Suggested mantra:

Information about the mantra:
1st week, Surya, Sun: Om Sooriya Graha Namaha, Om Sooriya Graha Athi Devathai Namaha
2nd week, Chandra, Moon: Om Chandra Graha Namaha, Om Chandra Graha Athi Devathai Namaha
3rd week, Mangala, Mars: Om Gujak Graha Namaha, Om Gujak Graha Athi Devathai Namaha
4th week, Budha, Mercury: Om Budan Graha Namaha, Om Budan Graha Athi Devathai Namaha
5th week, Guru, Jupiter: Om Guru Graha Namaha, Om Guru Graha Athi Devathai Namaha
6th week, Shukra, Venus: Om Sukira Graha Namaha, Om Sukira Graha Athi Devathai Namaha
7th week, Shani, Saturn: Om Sani Graha Namaha, Om Sani Graha Athi Devathai Namaha
8th week, Rahu, ascending lunar node: Om Raaghu Graha Namaha, Om Raaghu Graha Athi Devathai Namaha
9th week, Ketu, descending lunar node: Om Kethu Graha Namaha, Om Kethu Graha Athi Devathai Namaha