Ashwins

For the two months pair of Aipasi (Ashwin) and Karthika, the following travel with Sri Surya.

1. Adityas – Parjanya and Pushan
2. Rishis – Bharadwaj and Gauthama
3. Gandharvas – Chitrasena and Ruchisi
4. Apsaras – Viswamsi and Kirudhasi
5. Nagas – Vishrutha and Dhananjaya
6. Rakshas – Abha and Vadha

https://www.google.com/search?q=Ashwins+Sun

Apart

 Apart from Sri Surya, 

1. two Adityas, 
2. two Rishis, 
3. two Gandharvas, 
4. two Apsaras, 
5. two Nagas and 
6. two Rakshas (demons) also travel in the chariot. 

For every pair of two months, the travelers change.

https://www.google.com/search?q=Apart+from+Surya