One commonly recited mantra for appeasing ancestors and mitigating Pitra Dosha is the "Om Namo Bhagavate Vasudevaya" mantra. Chanting this Pitra Dosha mantra with devotion and sincerity is believed to invoke the blessings of Lord Vishnu and pacify the souls of ancestors. Additionally, reciting the Gayatri Mantra or the Mahamrityunjaya Mantra with reverence can also be beneficial in addressing Pitra Dosha.