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 — Asteroide in Leone

11 Parthenope

Asteroid Leone (Leo) Visibile

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

Mappa stellare Sistema Solare 3D + Lista + Piano

Proprietà

Magnitudine 9.5

Descrizione

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).

Posizione e identificatori

RA 10h 13m 28.3s

Dec +15° 22' 32.1"

Costellazione Leone (Leo)

Catalogo Parthenope

Wikipedia

Proprietà fisiche

Diametro 143 km

Massa 3.8e18 kg

Albedo 0.19 (19% reflected)

Rotazione 13.7 hours

Dimensione angolare 0.1″ (current)

Proprietà orbitali

Semiasse maggiore 2.4532 AU (367.0 million km)

Eccentricità 0.1005

Inclinazione 4.64°

Periodo orbitale 3.84 years

Distanza 2.147 AU (17.9 light-min)

Elongazione 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.