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4 Cassiopeiae — Star in Cassiopeia

Magnitude 5.0m Star Cassiopeia (Cas) Visible
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1Physical Properties

Magnitude 4.98
Range 4.94 - 5.00
Variable Type Slow Irregular Variable
Spectral Type M1III giant
Star Color Red (B-V 1.68)
Distance 466 ly

2Position & Identifiers

RA 23h 24m 50.3s
Dec +62° 16' 58.0"
Constellation Cassiopeia (Cas)
HR 8904
HIP 115590
HD 220652
SAO 20614
Flamsteed 4 Cas
SIMBAD

3How easy to spot?

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Equipment Bortle 3 Bortle 4 Bortle 5
Naked eye Medium Medium 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 Aug – Oct (peak: Sep)

5Survey Image

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Explore

6

Size Comparison

Querying VizieR for stellar data…
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

14Stellar Notes

NGC 7654 #923 (M52); Wolf 630 group.
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.

M52
NGC 7654
Easy
Rich open cluster
Open Cluster mag 6.9 0.7° Cassiopeia
Bubble nebula
NGC 7635
Hard+
Emission nebula — try an OIII filter
Emission Nebula mag 11.00 1.2° Cassiopeia
V509 Cas
Medium
Variable star, range 4.8–5.5
Variable Star mag 5.00 6.2° Cassiopeia
Show on Map

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