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 — Astéroïde dans Ophiuchus

48 Doris

Asteroid Ophiuchus Visible

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

Carte du Ciel Système Solaire 3D + Liste + Plan

Propriétés

Magnitude 10.4

Description

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.

Position et Identifiants

RA 17h 06m 08.3s

Dec -14° 56' 46.9"

Constellation Ophiuchus

Catalogue Doris

Wikipedia

Propriétés Physiques

Diamètre 222 km

Masse 1.0e19 kg

Albédo 0.06 (6% reflected)

Rotation 11.9 hours

Taille angulaire 0.1″ (current)

Propriétés orbitales

Demi-grand axe 3.1129 AU (465.7 million km)

Excentricité 0.0663

Inclinaison 6.56°

Période orbitale 5.49 years

Distance 2.462 AU (20.5 light-min)

Élongation 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.