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 — Asteroid in Ophiuchus

48 Doris

Asteroid Ophiuchus Sichtbar

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

Sternkarte 3D-Sonnensystem + Liste + Plan

Eigenschaften

Helligkeit 10.4

Beschreibung

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 & Bezeichnungen

RA 17h 06m 08.3s

Dec -14° 56' 46.9"

Sternbild Ophiuchus

Katalog Doris

Wikipedia

Physikalische Eigenschaften

Durchmesser 222 km

Masse 1.0e19 kg

Albedo 0.06 (6% reflected)

Rotation 11.9 hours

Winkeldurchmesser 0.1″ (current)

Bahneigenschaften

Große Halbachse 3.1129 AU (465.7 million km)

Exzentrizität 0.0663

Bahnneigung 6.56°

Umlaufzeit 5.49 years

Entfernung 2.462 AU (20.5 light-min)

Elongation 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.