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 in Ophiuchus

48 Doris

Magnitudine 10.4^m Asteroid Ophiuchus Visibile

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

Mappa stellare Sistema Solare 3D + Lista + Piano

Proprietà

Magnitudine 10.4

Descrizione

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.

Posizione e identificatori

RA 16h 34m 11.0s

Dec -13° 05' 38.6"

Costellazione Ophiuchus

Catalogo Doris

Wikipedia

Proprietà fisiche

Diametro 222 km

Massa 1.0e19 kg

Albedo 0.06 (6% reflected)

Rotazione 11.9 hours

Dimensione angolare 0.1″ (current)

Proprietà orbitali

Semiasse maggiore 3.1129 AU (465.7 million km)

Eccentricità 0.0663

Inclinazione 6.56°

Periodo orbitale 5.49 years

Distanza 2.338 AU (19.4 light-min)

Elongazione 162.1° Near opposition

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.