What telescope do I need to see Euterpe?

At magnitude 9.5, Euterpe is within reach of a 3-inch (80 mm) telescope from a moderate-Bortle site.

Euterpe — Asteroid in Gemini

27 Euterpe

Magnitude 9.5^m Asteroid Gemini (Gem) Visible

Rendered preview of Euterpe from the Nightbase orrery, lit from the current Sun direction with the terminator visible.

Star Map 3D Solar System + List + Plan

Properties

Magnitude 9.5

Description

Type: Asteroid

Distance: 2.347 AU

Orbital Period: 1313.5 days

Diameter: 96 km

Greek muse of music and lyric poetry; S-type; one of the brightest minor planets at opposition (typical mag 9.5).

Position & Identifiers

RA 07h 17m 18.4s

Dec +21° 56' 15.0"

Constellation Gemini (Gem)

Catalog Euterpe

Wikipedia

Physical Properties

Diameter 96 km

Mass 1.2e18 kg

Albedo 0.21 (22% reflected)

Rotation 10.4 hours

Angular Size 0.1″ (current)

Orbital Properties

Semi-major Axis 2.3472 AU (351.1 million km)

Eccentricity 0.1716

Inclination 1.58°

Orbital Period 3.60 years

Distance 2.267 AU (18.9 light-min)

Elongation 58.9° Moderate

Brightness Forecast (next 12 months)

Apparent magnitude as Earth–asteroid distance changes through the year. The peak marks the brightest moment in the window — usually around opposition, when the asteroid is closest and fully illuminated.

Computed from JPL orbital elements via m = H + 5·log₁₀(r·Δ). Phase-function correction is omitted, so curves trace distance variation only — accurate within a few tenths for main-belt asteroids; coarse for fast-moving NEOs near Earth.