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Upsilon Capricorni — Star in Capricornus

Magnitude 5.1m Star Capricornus (Cap) Visible
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1Physical Properties

Magnitude 5.10
Spectral Type M2III giant
Star Color Red (B-V 1.66)
Distance 172 ly

2Position & Identifiers

RA 20h 40m 03.0s
Dec -18° 08' 19.0"
Constellation Capricornus (Cap)
HR 7900
HIP 101984
HD 196777
SAO 163779
Bayer Upsilon
Flamsteed 15 Cap
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

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14Stellar Notes

Occultation diam. = 0.0041 - 0.0086".
15

Light Travel Time Machine

16

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.

12 Cap
Easy
Easy double, sep 22.0″
Double Star mag 5.94 2.4° Capricornus
NGC 6903
Hard+
Elliptical galaxy
Galaxy mag 13.0 4.0° Capricornus
M72
NGC 6981
Easy
Globular cluster — dense ball of ancient stars
Globular Cluster mag 9.3 6.5° Aquarius
M73
NGC 6994
Easy
Noteworthy asterism
Asterism mag 9.0 7.1° Aquarius
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