What telescope do I need to see Parthenope?

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

Parthenope — Astéroïde dans Lion

11 Parthenope

Asteroid Lion (Leo) Visible

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

Carte du Ciel Système Solaire 3D + Liste + Plan

Propriétés

Magnitude 9.5

Description

Type: Asteroid

Distance: 2.453 AU

Orbital Period: 1403.4 days

Diameter: 143 km

Greek siren who lured sailors to their deaths in Homer's Odyssey; S-type; one of the brightest minor planets at opposition (typical mag 9.5).

Position et Identifiants

RA 10h 13m 28.3s

Dec +15° 22' 31.9"

Constellation Lion (Leo)

Catalogue Parthenope

Wikipedia

Propriétés Physiques

Diamètre 143 km

Masse 3.8e18 kg

Albédo 0.19 (19% reflected)

Rotation 13.7 hours

Taille angulaire 0.1″ (current)

Propriétés orbitales

Demi-grand axe 2.4532 AU (367.0 million km)

Excentricité 0.1005

Inclinaison 4.64°

Période orbitale 3.84 years

Distance 2.147 AU (17.9 light-min)

Élongation 109.8° Good

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.