SELECT declination___j2000__ FROM table_name_77 WHERE constellation = "hydra" AND right_ascension___j2000__ = "10h46m44.9s"
Apa deklinasi (J2000) yang memiliki konstelasi hydra dan kenaikan kanan (J2000) 10H46M44.9S?
CREATE TABLE table_name_77 (declination___j2000__ VARCHAR, constellation VARCHAR, right_ascension___j2000__ VARCHAR)