Planetes publishing
Japanese manga volumes, Kodansha
Vol. 1, Jan 2001
Vol. 2, Oct 2001
Vol. 3, Jan 2003
Vol. 4, Feb 2004
See the entire Japanese edition online at these two sources: Comic Days | Piccoma
The Challenge of Space in 2075:
Planetes Official Guide Book
2075年宇宙への挑戦 プラネテス公式ガイドブック
B&W, 214 pages
Kodansha, Feb 2004
Published along with the final manga volume, this book offers a story summary, character guide, world & technology guide, real-world space history, fictional timeline, and more. The anime series was on TV at the time, but only gets 6 pages of coverage. Some of the material in this book was translated for the US manga edition by Tokyo Pop.
Planetes Companion
ふたごのプラネテス
Color and B&W, 152 pages
Kodansha, Dec 2004
Bundled with a DVD (containing Episode 7 with an audio commentary), this book is equally divided between the manga and anime series. The manga half includes tributes, a chapter reprint, and gag strips. The anime half includes an episode guide, model sheets, and tribute art.
US manga volumes, Tokyo Pop
Vol. 1 (Chapters 1-5), Oct 2003
Vol. 2 (Chapters 6-11), Jan 2004
Vol. 3 (Chapters 12-16, plus an extra), June 2004
Vol. 4/1 (Chapters 17-21 & bonus material), Nov 2004
Vol. 4/2 (Chapters 22-26 & bonus material), Feb 2005
The Japanese edition of Vol. 4 was double-length, so it was split in half for the US edition and augmented with material from the Challenge of Space 20175 book.
US manga volumes, Dark Horse
Vol. 1 (Chapters 1-12), Dec 2015
Order it from RightStuf here
Vol. 2 (Chapters 13-26, plus an extra), April 2016
Order it from RightStuf here
Model Graphix magazine articles, 2004-05
Model Graphix is a long running, high-end hobby magazine published by Dai Nippon Kaiga. Beginning in February 2004, it became the only magazine to publish articles concurrent with the Planetes anime release on DVD. That entire series of articles is presented here.