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IC 4691 — Galaxy in Ophiuchus

Galaxy Modest (16/100)

Elliptical

Magnitude 15.0m Galaxy Ophiuchus (Oph) Visible
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1Properties

Magnitude 15.0
Angular Size 1.0′ × 0.6′
Position Angle 150°
Distance 289.62 million ly
Galaxy Type Elliptical (E)
F, S, iF, 1 or 2 F st inv

Position & Identifiers

RA 18h 08m 45.7s
Dec +11° 49' 48.4"
Constellation Ophiuchus (Oph)
Catalog IC 4691

2How easy to spot?

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Telescope Bortle 3 Bortle 4 Bortle 5
80mm refr. V. hard V. hard V. hard
150mm Newt. V. hard+ V. hard+ V. hard+
C8 203mm Hard V. hard+ V. hard+
Easy Medium Hard Very hard Impossible

Bortle 3 = rural · 4 = outer suburbs · 5 = suburbs

Medium on Seestar S50

3Visibility

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Best season May – Jul (peak: Jun)

4 Eyepiece View

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125x TFOV: 0.4° Lim. mag: 13.6
N E

IC 4691 · 1.0′×0.6′ · N up, E left

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6 Surface Brightness

7 Morphology Decoder

8 Inclination & True Shape

9 Redshift

10 Size Comparator

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11

Light Travel Time Machine

12

Relativistic Travel

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