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Case study · Sci-fi · 2025

Orbit Decay

by Julian Kessel, Orbital-mechanics engineer; first-time novelist

ASIN B0DTHF8XLR

An orbital-mechanics engineer wrote a hard-SF novel where the science had to hold up. We paired him with a domain consultant (a second aerospace engineer who reads SF) during the developmental edit. The book launched in July 2025 and was shortlisted for a major hard-SF debut award in November.

  • Award shortlist Hard SF debut, 2025
  • Tor.com book-club selection, Oct 2025
  • 6,400 launch-quarter copies
  • Tor submission currently under consideration
Developmental editingLine editingDomain-consultant pairingBook cover designAmazon KDP publishing

Inside the project

The book on the desk, in five frames.

Working shots from this engagement — interview sessions, manuscript pages, cover concepts, launch day.

The domain-consultant pairing is the move that separated this engagement from a standard developmental edit. Sam read for story; the consultant (a working aerospace engineer who happens to read hard SF on weekends) read for which paragraphs were doing the over-explaining and which were genuinely needed to ground the reader.

The cut came out to roughly 4,200 words. The added emotional-arc scenes came in at 3,800 words. Net change: small. Net effect on reader engagement: substantial.

The award shortlist arrived in November. The Tor.com book-club selection in October. The Tor traditional submission is in flight as of writing.

“The consultant pass was the right call. Sam knew the structure was off; the engineer knew exactly which paragraphs were doing the over-explaining.”

Julian Kessel, Orbital-mechanics engineer; first-time novelist

Cover rounds

Three cover concepts for Orbit Decay.

The shortlist we presented to the author before round-one revisions. The selected concept is the second in the strip.

  • Concept A — typographic, restrained palette
  • Concept B — selected and revised
  • Concept C — photographic, alternative
  • Round one — typography tightened
  • Round two — final, print-ready
Julian Kessel on writing Orbit Decay 02:14 A two-minute clip from the launch-day interview. The author on what changed during the project.

Project facts

The numbers behind this one.

Services used
Developmental editing, Line editing, Domain-consultant pairing, Book cover design, Amazon KDP publishing
Timeline
Developmental edit 6 weeks; author rewrite 11 weeks; line edit 4 weeks
Investment band
$8,400–$10,200 total (edit + consultant + cover + KDP)
Published
2025
Genre
Sci-fi
ASIN
B0DTHF8XLR

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