Stargate Atlantis‘s “Coup D’etat” took a significant ratings hit on February 16, falling to the spin-off show’s lowest rating to date for a new episode premiere.The episode earned a 1.5 average household rating in its 9 p.m. Eastern/Pacific time slot, a drop of three-tenths of a ratings point from the previous week’s new episode. “Coup D’etat” fell below the previous low mark for the 2-year-old series, January 13’s “Epiphany.”Stargate SG-1 held steady from the previous week, with “The Scourge” earning a 1.6 rating at 8 p.m. Battlestar Galactica anchored the night at 10 p.m., taking top honors as The SCI FI Channel’s highest-rated show of the week. “The Captain’s Hand” earned a 1.7 rating, down another tenth of a point from the previous week.The highly anticipated season finales of SCI FI’s Friday night line-up air this Friday, March 10, starting at 8 p.m. Eastern/Pacific!(Source: Nielsen Galaxy Report, via Sci Fi Wire. Thanks to Morjana for the tip)