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Sigma Capricorni — Star in Capricornus

Magnitude 5.3m Star Capricornus (Cap) Visible
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1Physical Properties

Magnitude 5.28
Spectral Type K3II bright giant
Star Color Red (B-V 1.40)
Distance 130 ly

2Position & Identifiers

RA 20h 19m 23.6s
Dec -19° 07' 07.0"
Constellation Capricornus (Cap)
HR 7761
HIP 100195
HD 193150
SAO 163445
Bayer Sigma
Flamsteed 7 Cap
Double Cat 13675
SIMBAD

3How easy to spot?

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Equipment Bortle 3 Bortle 4 Bortle 5
Naked eye Medium Hard+ Hard
50mm finder Easy Easy Easy
150mm scope Easy Easy Easy
Easy Medium Hard Very hard Impossible

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

4Visibility

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Best season Jun – Aug (peak: Jul)

5Survey Image

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6

Size Comparison

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7

Compare Stars

8

Spectral Classification

9

Hertzsprung-Russell Diagram

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Read: The Hertzsprung-Russell Diagram — Reading Stars Like a Map
10

Stellar Lifecycle

11

Blackbody Spectrum

12

Stellar Absorption Spectrum

Simulated absorption spectrum based on spectral type. Hover over lines to identify elements.

13

Stellar Fusion

Discover

14

Light Travel Time Machine

15

Relativistic Travel

Nearby in the Sky

Other targets within a few degrees — pan your scope a little and keep exploring.

Visibility scores assume a 150 mm Newton at Bortle 4.

NGC 6903
Hard+
Elliptical galaxy
Galaxy mag 13.0 1.0° Capricornus
Pi Cap
Medium+
Easy double, sep 3.5″
Double Star mag 5.25 2.1° Capricornus
M75
NGC 6864
Easy
Compact globular cluster
Globular Cluster mag 8.6 4.2° Sagittarius
V505 Sgr
Medium+
Eclipsing binary, period 1.2d
Variable Star mag 6.48 7.7° Sagittarius
Show on Map

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