Astara is raced by her Perth-based breeder Neven Botica, who purchased her European Group Three-winning sire Dalghar from the Aga Khan to stand at Brighthill Farm.
Her Group One gavelhouse.com New Zealand 1000 Guineas odds have now been cut from $18 to $10 following her Soliloquy success.
"It was a great, tough win," Collett said. "She got a good draw and she was able to sit on the speed. She is an Ellerslie specialist and the extra trip [at Riccarton] will suit her down to the ground."
Runner-up Glass Slipper and third placegetter Mystery Show, at $7 and $8 respectively for the Guineas, both impressed with their finishing runs.
"It was a super run. She ran out a bit which probably cost her the race," the former's rider Leith Innes said.
Mystery Show went back to last from her wide gate and she also powered home. "She went huge," jockey Mark Du Plessis said. "We had no options from the draw, but she hit the line hard."
- NZ Racing Desk