: The Cygnus star system which is home to the outer colonies of New Jerusalem
: and Cygnus is the star Gliese 777 . Further, it is highly likely that the
: star around which the colony of Biko exists is the star HD 174080 .

: In the Definitive Edition of First Strike, there's a short story at the back
: called "Tug O' War". It is explicitly stated within some stellar
: distances that can be calculated: "Biko is located roughly
: twenty-four light-years from Cygnus and it's about fifty-eight light-years
: from Tribute. From point to point to point the total trip would be well
: over a month in length."

: Since it says "point to point to point" we're informed Biko to
: Cygnus is about 24 light-years and Cygnus to Tribute is about 58
: light-years.

: Tribute is in a fictionally known system, home also to the planet Reach:
: Epsilon Eridani.

: I also made the logical assumption that since Cygnus is an entire region of
: stars as viewed from Earth (called a constellation), that what the UNSC
: would call the 'Cygnus system' would be a star within that constellation.

: Using star charts, I figured out the only star within Cygnus that fits the
: distance parameter is Gliese 777 at 56.9 light-years. (Close enough to 58
: I suppose since most other stars in Cygnus are MUCH farther away in
: reality).

: Since there were no other contenders even in the ballpark, I think based on
: factual evidence, we can conclude that Gliese 777 can also be known as the
: Cygnus System. These colonies are where Chyler from the Forward Unto Dawn
: movie is from as well as Jilan Al-Cygni from Contact Harvest.

: Since Gliese 777 became a known quantity, I tried to find a star from that
: starting point measuring out 24 light-years and found at 24.15 a star
: called HD 174080. This can be the colony of Biko, so now we know where
: Spartan-III Carter is from. In this case, there are a couple of stars that
: are just under or just over the 24 light-year mark, but HD 174080 is the
: best match. (It's in the constellation Aquila, by the way.)

Another followup to the Gliese 777 system:

There's a main system yellow star in the system (Gliese 777A) with a small red dwarf binary companion (Gliese 777 B)

There's a Neptune-mass planet close in near the primary star and a Jupiter-sized planet far away from it. The most likely place for our fictional colonies is in between. I'll arbitrarily call out Cygnus first (but it could be reversed with the other colony) such that the system is made up of:

Gliese 777A [Cygnus] (main yellow star)
- Cygnus I (Neptune-mass planet)
- Cygnus II (Cygnus colony)
- Cygnus III (New Jerusalem colony)
- Cygnus IV (Jupiter-sized planet)
Gliese 777B (red dwarf binary)