Erinome / Factbook

Factbook · Erinome

Erinome at a glance

A one-card profile in the style of a national factbook. Every number links to its source or is labeled as a model assumption.

  • As of Oct 24, 2026
  • Sources 3

Erinome

Jupiter XXV · S/2000 J 4

Introduction

Type
Irregular, retrograde moon of Jupiter; Group: Carme group.Source: [1] Wikipedia
Discovery
Discovered: Nov. 23, 2000, Mauna Kea, Hawaii; Discoverers: S. S. Sheppard, D. C. Jewitt, Y. R. Fernandez, E. Magnier.Source: [2] NASA Science

Physical

Size
Diameter: ≈ 3 km.Source: [1] Wikipedia
Mass
Not measured in our sources.
Rotation
Not measured in our sources.
Surface composition
Colour: Light red, like most Carme-group moons.Source: [2] NASA Science
Moons
None reported in our sources.

Orbit & access

Orbit
Mean distance: ≈ 23.0 million km from Jupiter; Orbital period: ≈ 714 days; Inclination: ≈ 164° (retrograde); Eccentricity: ≈ 0.27.Source: [3] NASA JPL Solar System Dynamics
Accessibility (Δv / travel time)
Model assumptionAbout 10.5 km/s of ideal Δv from low Earth orbit (6.30 km/s to depart + 4.20 km/s to arrive), and about 2.7 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 −$2,015M (bear), −$1,170M (base) and $2,594M (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 →

Want the research behind these numbers? See Science. Thinking about the money side? See Business.