Starlog 1 (August 1976) had an article Radical Changes for the Second Season by David Houston
Starlog 2 (November 1976) had cover art for Space: 1999, an article by David Houston titled Recovering from The Mysterious Unknown Force and an episode guide
Starlog 3 (January 1977) continued the episode guide. There was also a short article Catherine Schell here to publicize Space: 1999
Starlog 4 (March 1977) had a Nick Tate interview.
Starlog 5 (May 1977) completed the episode guide, and had a special letters section titled The Conflict Rages
Starlog 6 (June 1977) announced "Moonbase Alpha ceases operation"
Starlog 7 (August 1977) included the Eagle blueprints
Starlog 9 (October 1977) had a Gerry Anderson interview
Starlog 10 (December 1977) had an article about Space Journey: 1999
Starlog 14 shows some behind the scenes photographs. Thanks to Jerome Wybon.
Starlog 15 (August 1978) began a monthly column by Gerry Anderson.
Starlog 24 included a small Space: 1999 photo on the cover and a two page retrospective inside (along with congratulation notes from Barry Gray, Gerry Anderson, Martin Landau, Barbara Bain and Brian Johnson.
Also...