Euphrosyne
(31) Euphrosyne · discovered 1854 — the first asteroid found from North America
Introduction
- Type
- Main-belt asteroid, C-type (Tholen) / Cb (SMASS).Source: [1] NASA JPL Solar System Dynamics
- Discovery
- Discovered: Sept. 1, 1854 by James Ferguson — first asteroid found from North America.Source: [2] Wikipedia
Physical
- Size
- Diameter: ≈ 267 km; Shape: Third-roundest known asteroid, after Ceres and Hygiea.Source: [1] NASA JPL Solar System Dynamics, [2] Wikipedia
- Mass
- Mass: (1.7 ± 0.3) × 10¹⁹ kg; Density: 1.7 ± 0.2 g/cm³.Source: [2] Wikipedia
- Rotation
- Rotation period: ≈ 5.53 hours.Source: [1] NASA JPL Solar System Dynamics
- Surface composition
- Geometric albedo: ≈ 0.053 (very dark).Source: [1] NASA JPL Solar System Dynamics
- Moons
- Moon: One, found 2019; ≈ 4 km, ≈ 1.2-day orbit at ≈ 670 km.Source: [2] Wikipedia
Orbit & access
- Orbit
- Distance from Sun: 2.48–3.84 AU; Inclination: ≈ 26.3°.Source: [1] NASA JPL Solar System Dynamics
- Accessibility (Δv / travel time)
- Model assumptionAbout 13.4 km/s of ideal Δv from low Earth orbit (5.21 km/s to depart + 8.17 km/s to arrive), and about 1.5 years for an ideal transfer.Model calculation from our Space Resource Intelligence (SRI) sample report: ideal two-impulse Hohmann transfer with a plane change, 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). Extractable water by mass from hydrated carbonaceous material; SRI assumption, not measured for this body.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 −$2,237M (bear), −$1,178M (base) and $3,276M (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 →