ASTRIS was a star-nymph daughter of the sun-god Helios and the wife of the Indian river-god Hydaspes.

Nonnus, Dionysiaca 17. 269 ff (trans. Rouse) (Greek epic C5th A.D.) :
"He [Orontes the Indian chief, who led ] stept back and turned his gaze to the eastern expanse, and uttered his last words to Phaethon [Helios the sun] opposite : `O Helios . . . And if you have not forgotten your Klymene’s bed, protect Deriades, a sprout of your own stock, who has in him the blood of Astris (Sidereal Maiden) [i.e. the wife of Hydaspes and mother of Deriades] said to be your daughter [by Klymene].'" - Nonnus, Dionysiaca 17.269

Nonnus, Dionysiaca 23. 236 ff :
"[Dionysos addressesthe Indian river Hydaspes when he attempts to drown his troops :] `And if it is Asterie [daughter of Helios] your wife that makes you so proud, because she has the blood of Hyperion’s heavenly kin, my father burnt with fire the gold son of Helios the fiery charioteer [Phaethon].'"

Nonnus, Dionysiaca 26. 32 ff :
"You [Deriades king of the Indians] have in you the heavenly blood of a daughter of Phaethon [i.e. Astris, daughter of Helios], your blazing grandfather."

Nonnus, Dionysiaca 26. 350 ff :
"The emperor of the Indians [Deriades], son of Hydaspes the watery lover in union with Astris daughter of Helios, happy in her offspring--men say that her mother was Keto, a Naias daughter of Okeanos--and Hydaspes crept into her bower till he flooded it, and wooed her to his embrace with conjugal waves."

Nonnus, Dionysiaca 27. 100 ff :
"My [Deriades] mother’s [Astris's] father, governor of the flaming stars, Phaethon [Helios], is himself a potentate all of fire."

Nonnus, Dionysiaca 27. 189 ff :
"[Dionysos addresses his troops during the Indian War :] `Let Astris wander away to the mountains, to bewail her son Deriades a slave in heavy chains: let her go, if she likes, to settle in Celtic land, that she also may turn into a tree with the Heliades and weep often in floods of sorrowful tears.'"

Nonnus, Dionysiaca 33. 150 ff :
"[Aphrodite addresses Eros :] `Helios mocks at me, and arms the offspring of Astris, the warrior Deriades his own daughter’s son, to destroy the Bassarides of womanmad Dionysos and to rout the love-stricken Satyroi of Bromios.'"

Sources:

• Nonnos, Dionysiaca - Greek Epic C5th A.D.