ॐ मित्राय नमः । ॐ रवये नमः । ॐ सूर्याय नमः । ॐ भानवे नमः । ॐ खगाय नमः । ॐ पूष्णे नमः । ॐ हिरण्यगर्भाय नमः । ॐ मरीचये नमः । ॐ आदित्याय नमः । ॐ सवित्रे नमः । ॐ अर्काय नमः । ॐ भास्कराय नमः ।
Surya
Surya Mantras
The twelve short salutations to the Sun, one for each of his names, as used in Surya Namaskar. Each has the form Om, the name, Namah: Mitra, Ravi, Surya, Bhanu, Khaga, Pushan, Hiranyagarbha, Marichi, Aditya, Savitri, Arka and Bhaskara. They are said one by one with the twelve steps of the sun salutation at sunrise, or chanted on Sundays.
Wording checked against: Sanskrit Documents: सूर्यनमस्कार मन्त्राः (the twelve names, with the bija forms) https://sanskritdocuments.org/doc_deities_misc/suryanamaskArmantra.html; Wikipedia: Sun Salutation (table of the twelve mantras) https://en.wikipedia.org/wiki/Sun_Salutation. Editions differ slightly; follow your family's or guru's version if it differs.