Halimede
Neptune IX · S/2002 N 1
Introduction
- Type
- Irregular, retrograde moon of Neptune.Source: [1] Wikipedia
- Discovery
- Discovered: 14 Aug. 2002, Cerro Tololo, Chile.Source: [1] Wikipedia
Physical
- Size
- Diameter: ≈ 42–62 km.Source: [1] Wikipedia
- Mass
- Not measured in our sources.
- Rotation
- Not measured in our sources.
- Surface composition
- Colour: Grey, similar to Nereid.Source: [1] Wikipedia
- Moons
- None reported in our sources.
Orbit & access
- Orbit
- Mean distance: ≈ 16.6 million km from Neptune; Orbital period: ≈ 1,879 days (5.1 years); Inclination: ≈ 120° (retrograde); Eccentricity: ≈ 0.52 (varies 0.19–0.90).Source: [2] NASA JPL Solar System Dynamics, [1] Wikipedia
- Accessibility (Δv / travel time)
- Model assumptionAbout 11.8 km/s of ideal Δv from low Earth orbit (8.25 km/s to depart + 3.51 km/s to arrive), and about 31 years for an ideal transfer.Model calculation from our Space Resource Intelligence (SRI) sample report: ideal transfer to the parent planet, then capture into this moon's orbit; no gravity assists. Real trajectories differ.
- Mission history
- No spacecraft visit is listed in our sources. What is known comes from telescopes.
Resources & economy
- Believed resources
- Model assumptionOur model looks at water / volatiles for propellant and life support. Usable fraction assumed at 0.02–0.1 of extracted material (bear to bull). Composition of small irregular moons is unmeasured; water content is a pure SRI assumption.SRI sample-model assumption, not a measurement.
- Economic outlook
- Model assumptionScientific value now; any resource value is long-horizon option value. Our sample model gives an NPV of about −$1,939M (bear), −$1,052M (base) and −$547M (bull).Model output from our SRI sample valuation model (launch, product value, transit, extraction and discount-rate inputs are scenario assumptions, not forecasts). Not investment advice.
- Business uses
- Information products, science partnerships, and a (very long-shot) in-space resource case. See the Business page. Open →