Dec 17 (Reuters) - Wall Street’s main indexes opened higher on Thursday on increased optimism over a coronavirus stimulus bill, while an unexpected rise in weekly jobless claims pointed to further economic stress from the COVID-19 pandemic. The Dow Jones Industrial Average rose 61.46 points, or 0.20%, at the open to 30,216.00. The S&P 500 opened higher by 12.48 points, or 0.34%, at 3,713.65, while the Nasdaq Composite gained 72.59 points, or 0.57%, to 12,730.78 at the opening bell. (Reporting by Shreyashi Sanyal in Bengaluru; Editing by Maju Samuel)