What telescope do I need to see Doris?

At magnitude 10.4, Doris is best observed with a 6-inch (150 mm) or larger telescope.

Doris — Asteroide en Ophiuchus

48 Doris

Asteroid Ophiuchus Visible

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

Mapa Estelar Sistema Solar 3D + Lista + Plan

Propiedades

Magnitud 10.4

Descripción

Type: Asteroid

Distance: 3.113 AU

Orbital Period: 2006.0 days

Diameter: 222 km

Sea-nymph daughter of Oceanus; C-type, low albedo, outer-belt orbit at 3.11 AU.

Posición e Identificadores

RA 17h 06m 08.3s

Dec -14° 56' 46.9"

Constelación Ophiuchus

Catálogo Doris

Wikipedia

Propiedades Físicas

Diámetro 222 km

Masa 1.0e19 kg

Albedo 0.06 (6% reflected)

Rotación 11.9 hours

Tamaño angular 0.1″ (current)

Propiedades orbitales

Semieje mayor 3.1129 AU (465.7 million km)

Excentricidad 0.0663

Inclinación 6.56°

Período orbital 5.49 years

Distancia 2.462 AU (20.5 light-min)

Elongación 142.3° 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.