Goddess Mahagauri is the 8th of the 9 forms of Goddess Durga and is worshipped on the 8th night of Navratri.
Significance of Mahagauri as explained by Gurudev Sri Sri Ravi Shankar
The epitome of beauty: Mahagauri
Mahagauri means that form which is beautiful and resplendent. If you see, Nature has two extremes. One of the forms is Kaalratri which is most terrifying and devastating, and on the other hand you see Mahagauri which is the most beautiful and serene form of the Mother Divine.
Mahagauri represents the epitome of beauty. Mahagauri confers and fulfills all your wishes and desires. Devi Mahagauri gives you all blessings and boons that you seek for material gains, so that you become content from within and move forward in life
Mantra for Mahagauri
The Mantra for Mahagauri is
Aum Hrim Mahagauri Durgaye Namaha
You can do a 108 Japa of this mantra using the japa108.com app.
Connection with Rahu
Rahu is the planet connected to Mahagauri. Rahu is all about desires and since he has a head without the body he does not get satisfied. Rahu gives you the power and passion to fulfilling all your ambitions only to leave you feeling empty and to realise that desires whether fulfilled or not fulfilled leads to misery. Similarly this form of the Goddess gives you the power to achieve all your materialistic desires for you to be either content and search for the deeper meaning of life or to feel meaningless about these desires and seek real peace and happiness from within.