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IC 4991 — Galaxy in Sagittarius

Galaxy Fair (31/100)

Lenticular

Magnitude 11.5m Galaxy Sagittarius (Sgr) Visible
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1Properties

Magnitude 11.54
Angular Size 2.9′ × 2.1′
Position Angle 129°
Distance 265.68 million ly
Galaxy Type Lenticular (S0)
vF, cS, R

Position & Identifiers

RA 20h 18m 24.0s
Dec -41° 02' 60.0"
Constellation Sagittarius (Sgr)
Catalog IC 4991

2How easy to spot?

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Telescope Bortle 3 Bortle 4 Bortle 5
80mm refr. Hard+ Hard Hard
150mm Newt. Medium+ Medium Medium
C8 203mm Easy Medium+ Medium+
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 Jun – Aug (peak: Jul)

4 Eyepiece View

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125x TFOV: 0.4° Lim. mag: 13.6
N E

IC 4991 · 2.9′×2.1′ · N up, E left

5 Best Magnification

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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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