HABITATS CAN CYCLE...
...throughout the inner Solar System.
Habitats could leverage
highly eccentric NEA orbits
to periodically cross planetary orbits.
Habitats could leverage
highly eccentric NEA orbits
to periodically cross planetary orbits.
Some Near Earth Asteroid (NEA) orbits periodically
cross two different planetary orbits.
cross two different planetary orbits.
Some of these NEAs can become specialized Habitats,
CYCLERS,
which rendezvous with Earth every two years
to transport payloads throughout the inner Solar System.
CYCLERS,
which rendezvous with Earth every two years
to transport payloads throughout the inner Solar System.
Initial cyclers will likely transport payloads
between Earth and orbit of Mars.
between Earth and orbit of Mars.
Typical cycler will likely be a habitat transformed from a Near Earth Asteroid (NEA). A cycler trip will be lengthy, but a large internal volume and Earthlike gravity (from centrifugal force due to longitudinal spinning) can make a cycler orbit a very pleasant voyage with many traveling companions (perhaps 10,000 passengers).

Cycler Definitions
Cycler: Habitat in a resonant, transfer orbit.
Transfer Orbit: Highly eccentric solar orbit
which transits two planetary orbits.
Earth Resonant Orbit: Solar orbit with period
as exact multiple of Earth's Period (i.e., 2 years, 3 years, etc.)
Resonant Cycler can transfer large payloads
between Earth and a destination orbit.
 
Single 2 Year Cycler with biennial rendezvous
at semilatus rectum: ℓ = 1 AU.
Cyclic periods depend on Kepler's Third Law.
Square of orbital period, P, equals the cube of the semimajor axis, a.

EXAMPLE: If a 2 year Apollo happens to intersect Earth's orbit, it will continue to intersect Earth's orbit at same position every 2 years. Right side diagram shows a cycler habitat completing its biennial rendezvous. Presumably, there was an exchange of cargo and many passengers, and the cycler starts another 2 year orbit which will extend well beyond orbit of Mars.
An effective cycler orbit cycler could have an elongated orbit as shown; the perihelion (q, orbit's closest point to Sol) lies between orbit of Earth and orbit of Mars, and aphelion (Q, orbit's farthest point) is well past orbit of Mars.
Even on a resonant, 2 year orbit; a randomly placed cycler would most likely never encounter neither Earth nor Mars.However, a well placed cycler would accomplish biennial rendezvous with Earth as it pierces Ecliptic, the plane of the Earth's orbit around Sol, a common reference for describing a celestial object's position in Solar System. Furthermore, that object's inclination (i) is the angle between that object's orbital plane and the Ecliptic (i.e., a greater i indicates object spends most of its orbit far from Ecliptic, while lesser i indicates closer.)  
REALIGN THE ORBIT.
BACKGROUND: Of the eight thousand cataloged Apollo asteroids, very few (perhaps 80) are Earth resonant with orbital periods of precisely two years. Also, resonance does not obligate an object to intersect orbit of Earth. Of these 80 resonant Apollos, their nearest distance to Earth's orbit ranges from .001 AU to .142 AU (149,600 km to 21.2 million km). Recall Luna orbits Earth with radius of 384,400 km.
HOWEVER, NEA Orbits can be adjusted. Just as an asteroid can transform into a comfortable Habitat, its orbital perihelion can adjust to intersect near Earth every two years. (See right side diagram.) Thus, cycler orbit perihelion becomes q=1 AU, and it does biennial rendezvous as shown. Other considerations: Furthermore, orbit's inclination (i) can adjust to near zero. Carefully plan cycler orbit to not collide with Luna. Annual event: add another cycler exactly 180° from the other one (see diagram). Thus, one cycler would rendezvous with Earth on even years (i.e., 2024, 2026, 2028, ...) and other cycler would rendezvous on odd years (2025, 2027, 2029, ...) 
Compared with previous cycler example:
1) Orbit extends less further past orbit of Mars. 2) Added cycler can make the Earth rendezvous an annual event.  
ADD ANOTHER ORBIT
The first cycler orbit was designed with zero inclination (i) such that the perihelion (q) coincides with Earth's Vernal Equinox (VE).ADD ANOTHER similar cycler orbit such that q aligns with Earth's Winter Solstice (WS). ANNUAL RENDEZVOUS EVENTS: Both the VE orbit and the WS orbit could have two properly placed cyclers to rendezvous with Terra (i.e., Earth) at orbit's perihelion (q). Given a 2 year period, any given cycler is constrained to meet with Terra only once every two years. However, each orbit could have two cyclers: one to service Terra on odd years; the other on even years. Since this example assumes two fully deployed biennial orbits, Terra will enjoy visits from two cyclers each year.  
ADD EVEN MORE ORBITS
VE orbit could be replicated and realigned as shown in right side diagram; such a deployment would service Terra four times annually.THEORETICALLY: There is no limit for quantity of rendezvous events. Given sufficient resources and resolve, cyclers could Earthrendezvous monthly, weekly and even daily. FEASIBILITY: Safety concerns does impose some obvious restrictions. EXAMPLE: If we decided to implement multiple daily rendezvous events, common sense tells us this greatly increases the risk of cycler collisions with Terra, Luna and even other habitats. Note similar risk of current day aircraft incidents. Even though air travel is generally quite safe, incident risk does increase due to increased quantity of air traffic. PRACTICALLY: Human economy will quantify cycler events. EXAMPLE: SPACE TOURISM. Cycler supply would increase in response to a huge demand for two year "cruises" on very pleasant environments through celestial heavens (just as wealthy clients now take ocean cruises "around the world"). For more examples, see following list of REVENUE GENERATING ACTIVITIES. However, if cycler events cannot be monetized; they won't last.  
From the revenue list (see right), TE speculates on a few:
ASTEROID TELEPOSSESSION
By definition, a cycler cannot stop cycling. Thus, it cannot interrupt its orbit to conduct mining operations; however, it can deploy much smaller vessels throughout its orbit. Thus, a cycler crew will likely deploy a much smaller, autonomous Artificial Intelligence (AI) vessel to claim a suitable asteroid. Via constant communications, the cycler crew would "telepossess" this asteroid. AI vessel will deploy devices to mine and process resources to create a suitable payload for another cycler to someday recover. Thus, the autonomous AI vessel would communicate with incoming cycler to coordinate subsequent activities required to launch payload from asteroid and gracefully intercept cycler. 
 
EARTH MARS OPERATIONS
Initial task of 2 year cyclers might be to transfer payloads to/from orbit of Mars though not directly to Mars itself. Sidereal orbit of Mars (1.88 years) does not resonate with orbit of Earth (i.e., every two years); thus, two year cycler will always rendezvous with Earth, but it will seldom rendezvous with Mars. HOWEVER, two year cycler can inject Mars bound payload into a closer orbit.
1) Outer Concentric Orbit is slower than orbit of Mars; thus, Mars can "catch up" to payload. 2) Inner Concentric Orbit is faster; thus, payload can gain on Mars, the planet. 3) Most Likely Option: Launch Payload into specially designed transfer orbit to intercept Mars.
For more about cycling to Mars, see next chapter, Marsonance.

SUMMARY:
For some Apollo NEAs to become 2 year cyclers, consider following tasks:I. Leverage NEAs. Select asteroid to transform into Habitat. II. Adjust NEA Orbit. Ensure period is 2 years, and it intersects Earth orbit in coordination with Earth, planet. III. Add More Orbits. Replicate and arrange additional orbits.
REVENUE IS THE REASON:
Cycler benefits must be monetized or they won't last.

VOLUME O: ELEVATIONAL 

VOLUME I: ASTEROIDAL 
VOLUME II: INTERPLANETARY 
VOLUME III: INTERSTELLAR 
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