Rosalynn Carter, in town for a speech at American University, said yesterday that Democratic officials in Georgia have talked to her about running against Sen. Mack Mattingly in 1986, but she said she has no such plans now. Instead, she said she and the former president are writing a health book, focusing on the unnecessary causes of death and disease in the United States . . .

Sen. Jake Garn, talking on the phone from his Washington home to a Salt Lake City radio talk show, said he isn't going into space for "the heck of it." And he accused reporters of a double standard in criticizing his space-shuttle flight while lusting for one of their own. He said a journalist will probably be on a future flight . . .

Philadelphia Orchestra conductor Riccardo Muti, who, it was feared, planned to return home to Italy once his contract ended, has ended those fears by extending his contract until 1990. The 42-year-old Muti is a successor of the legendary Eugene Ormandy . . .

Media Movements: Alice Rogoff has been appointed senior vice president and chief financial officer of U.S. News & World Report. Rogoff, who has been a partner in the Washington-based investment banking firm of G. William Miller & Co. Inc., was a former assistant to the publisher of The Washington Post and a former special assistant to the director of the Office of Management and Budget . . . Dick Victory, a former Washington Star and Washingtonian magazine editor, who was most recently deputy managing editor of the Orlando Sentinel, has returned to Washingtonian magazine as senior editor . . .