Chief Justice John Roberts planned to preside at two oath-taking ceremonies Saturday allowing Sotomayor to begin her new job.
In a private one in the justices' conference room, Roberts was to administer an oath that the Constitution requires of all federal officials, to "support and defend" the Constitution.
Then, in a public ceremony expected to air live on some television networks, Sotomayor was to take a second oath in which she would pledge to "administer justice" fairly and impartially, as prescribed by a 220-year-old federal law.
President Barack Obama scheduled a White House reception for Sotomayor on Wednesday.
Sotomayor, 55, has been a federal judge for 17 years. Obama nominated her in May to take the place of Justice David Souter after Souter announced his retirement. The Senate confirmed Sotomayor's nomination Thursday by a 68-31 vote.
The court is set to hear arguments Sept. 9 in a campaign finance case. The entire court will convene the day before for a formal ceremony to welcome Sotomayor.
Many presidents have been on hand to see their nominees take their seat on the Supreme Court bench for the first time. President George W. Bush attended Roberts' ceremony in October 2005.
