According to the search results, the Powerball jackpot for October 9, 2023 was estimated to be $1.57 billion with a cash value of $686.5 million. However, the jackpot was not won on that day, and it continued to grow. The next day, October 10, 2023, the jackpot was estimated to be $1.73 billion, making it the second-highest lottery jackpot in history. Therefore, the answer to the question "what is the Powerball jackpot for October 9, 2023?" is $1.57 billion.