The world champion Washington Bullets, new members of the Atlantic Division of the National Basketball Association, will open their 1978-79 season with an Oct. 13 game here against New Orleans.

Although that game will be on a Friday the 13th, previous good fortune will be rewarded as the championship banner will be flown for the first time and the Bullets will be presented championship rings by league Commissioner Lawrence O'Brien.

The switch to the Atlantic Division means Washington will battle for first place with talent-laden Philadelphia and New York. Boston, coming off the worst-record (32-50) in Celtics' 31 years, should be tougher following the acquisition of Marvin Barnes, Nate Archibald and Billy Knight. Lowly New Jersey completes the division.

The Bullets will play four games apiece, two home and two away, against 19 teams. Washington will face San Diego and Kansas City three times each to complete an 82-game schedule.

Seattle, the loser to Washington in last season's championship series, will play here Jan. 23 and Feb. 23.

Bullet General Manager Bob Ferry is especially pleased with the eight home games slated for March.

"From a winning standpoint, we always try to build a heavy home schedule in March when we are early in our playoff drive," he said.