Aldrin classic Earth-Mars cycler (inbound / down-escalator, 1 synodic)

aldrin-classic-em-k1-inbound · source: literature · validation: V0

Signature

Bodies: M-E
Sequence (canonical): M-E
Sense: inbound
Period: 2.135 yr (1 × E-M synodic)
Priority date: 1985-10-28

V∞ at encounters

M (#1): 9.70 km/s
Due to symmetric geometry, the inbound V_inf matches the outbound V_inf. Value from Russell 2004 Table 3.4 for the Aldrin.
E (#2): 6.50 km/s
Symmetric with outbound.

Orbit elements (heliocentric)

Semi-major axis a: 1.600 AU
Eccentricity e: 0.393
Perihelion: 0.970 AU
Aphelion: 2.230 AU
Inclination: 0.00°

Orbital elements are identical to the outbound escalator (Rogers et al. 2012 Table 1).

Legs

M → E: 146 d, 0 revs
Mars->Earth inbound transit. Symmetric to the outbound leg.
E → M: 634 d, 0 revs
Derived mathematically: T_cycler (780 d) - inbound transit (146 d) = 634 d.

Primary citation

Aldrin, B. (1985). Cyclic Trajectory Concepts. SAIC presentation to the Interplanetary Rapid Transit Study Meeting, JPL.

Notes

The "inbound" / "down escalator" branch. Time-mirror image of `aldrin-classic-em-k1-outbound`. While M7 novelty matching will likely collapse this under the same primary identity as the outbound, it is given a dedicated seed so the search algorithm validates both directional geometries explicitly.

Source quotes (per-field provenance)

Every numerical value in this entry traces to a verbatim or paraphrased quote from a cited source.

a_au: Rogers et al. 2012, Table 1: 'Aldrin Cycler ... Semi-Major Axis, AU: 1.60'.
e: Rogers et al. 2012, Table 1: 'Aldrin Cycler ... Eccentricity: 0.393'.
perihelion_au: Rogers et al. 2012, Table 1: 'Aldrin Cycler ... Perihelion Radius, AU: 0.97'.
aphelion_au: Rogers et al. 2012, Table 1: 'Aldrin Cycler ... Aphelion Radius, AU: 2.23'.
vinf_kms_at_encounters[0].vinf_kms: Russell 2004 dissertation §3.8: 'Due to symmetry, the energy properties for inbound and outbound cyclers are identical.'
vinf_kms_at_encounters[1].vinf_kms: Russell 2004 dissertation §3.8 (same as above).
legs[0].tof_days: Wikipedia / McConaghy 2002: symmetric 146-day fast transit.
period.years: Earth-Mars synodic 2.135 yr — spec.md §9.