44 Bootis

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44 Bootis
Placeholder star.jpg
Spectral Class: G0V (a)

K0V (b), K4V (c)

Stage: Main Sequence (Trinary)
Galactic Coord: 3.912, 22.178, 34.899
Mass: 1.01 Sol (a)

1 Sol (b), 0.98 Sol (c)

Radius: 1.04 Sol (a)

0.88 Sol (b), 0.66 Sol (c)

Luminosity: 1.14 Sol (a)

0.54 Sol (b), 0.31 Sol (c)

Temperature: -
HZ Start: -
HZ End: -
Other Names: 44B,

4D4 The Boot i Bootis i Boo HD 133640 HIP 73695 HR 5618 SAO 45357

44 Bootis is a trinary star system located 41.6 Light Years from Sol. It is located on the fringes of Terran Alliance space. It was in the process of colonization during the Exodus Event. The colony ships departed Earth in 2331 and are scheduled to arrive at the planet Corubah, in orbit of the A component, in 2405.

The system has the variable star designation i Boötis and is often confused with Iota Boötis, a Delta-Scuti-type variable star of spectral and luminosity type A9 V.

All three stars of the 44 Boötis system are similar to Sol in size, brightness, and color. This was a primary reason for studying the system as a candidate for colonization. Once terrestrial worlds with oxygen rich atmospheres were discovered in the habitable zones of these stars, plans were put into place to establish a colony.

The structure of this system is common for a trinary system; 2 stars orbit each other in a tight binary pair (in this case the B & C stars), and then that pair orbits the other star at a wider interval.

Physical Properties - A Component

This star is a yellowish main sequence dwarf star of spectral and luminosity type G0Vn. It is slightly more massive than Sol (1.01 Solar Mass), with about the same diameter (1.05 Sol), and around 1.14 times its luminosity. The HZ for the Primary component is centered at 1.07 AU, very similar to Earth's location in Sol. Useful star catalogue numbers and designations for 44 Boötis A include: 44 Boo, i Boo, 44i Boo, HR 5618*, Gl 575 A, Hip 73695, HD 133640, BD+48 2259, SAO 45357, Struve 1909 A, and ADS 9494 A.

From the perspective of an observer on Earth, the orbit of Star A and the BC tight binary pair exhibit a very elongated and narrow ellipse whose separation has varied from 4.7" in 1880 to less than 0.4" in 1969. According to late 20th century measurements found in the new Sixth Catalog of Visual Orbits of Binary Stars, Stars A and B are separated by an "average distance" of about 48.5 AUs, or more than the average of orbital distance of Pluto in the Solar System. They move in a highly elliptical orbit that takes about 206 years to complete.

System Overview - A Component

44 Bootis is one of the farthest colony worlds from Sol at the time of the Exodus Event. It will be settled in 2405, after the colonists complete a cryostasis journey of more than 74 years.

Aside from being a trinary star, this system is fairly similar to Sol. Scientific analysis of the orbital patterns of the A component suggest that this entire planetary system formed first. At some point later, the B/C binary moved close to the A component and was captured by the star's gravity. The resulting final orbits wreaked havoc in the mid-system, causing two rocky worlds to be ripped apart by the B/C pair, while other worlds had their orbital inclination drastically altered.

The entirety of the B/C pair orbits through the middle of the A system, passing in a gap in between the inner planets and the middle planets.

A System Bodies

  • Undehune
  • Dietzen
  • Corubah
  • Memenjaya Belt
  • Talran
  • Terjandy Belt
  • Helgath
  • Neenuraji Belt
  • Suplaya Belt
  • Gandan
  • Enthar
  • Ethrier

Physical Properties - B/C Component

This star is a yellow main sequence star of spectral and luminosity type G2V. It is extremely similar to Sol in terms of mass and size, but it is only half as bright. The C component orbits extremely close to the B - the photospheres of the stars are touching. They are a type of binary known as a shallow contact binary. The C component is a G7V that is roughly 2/3rds the size of Sol and only 1/3rd as bright.

The HZ for the BC component is centered at 0.73 AU, between the orbits of Venus and Earth in Sol.

System Overview - B/C Component

Scientific analysis of the orbital patterns of the B component suggest that this entire planetary system was fully formed before the C component arrived on the scene and was captured by the star's gravity. The inner planets of the B/C component were entirely destroyed by the arrival of the C star. The only B planet that was largely unaffected by the arrival of the C component was Papishan, a gas giant of nearly Jupiter size. Scientists speculate that almost all of the C component's planetary bodies were stripped away and flung off into space, with the sole exception of a frozen terrestrial world called Kawsyth. This world has an unusually high inclination and a retrograde orbit, leading researchers to speculate that it is the sole survivor of the C component's original system.

Although there are some terrestrial planets with oxygen atmospheres in this system, none of the worlds are close enough to the stars to have liquid water.

B/C System Bodies

  • Kaka Belt
  • Bootis Belt
  • Mastamis
  • Papishan
  • Ifost Belt
  • Kawsyth
  • Cosirunt
  • Ori
  • Nipanse


Physical characteristics for the orbital properties of the stars themselves are based on actual data from HIPPARCOS. The planets and system bodies, while plausible, are fictitious.