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22 Cassiopeiae — Star in Cassiopeia

Magnitude 4.5–4.6m Star Cassiopeia (Cas) Visible
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1Physical Properties

Magnitude 4.54
Range 4.31 - 4.62
Variable Type Gamma Cassiopeiae (Eruptive Be Star)
Spectral Type B5IIIe bright giant
Star Color Blue-white (B-V -0.07)

2Position & Identifiers

RA 00h 44m 43.5s
Dec +48° 17' 04.0"
Constellation Cassiopeia (Cas)
HR 193
HIP 3504
HD 4180
SAO 36620
Flamsteed 22 Cas
Variable ID Omi Cas
Double Cat 622
SIMBAD

3How easy to spot?

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Equipment Bortle 3 Bortle 4 Bortle 5
Naked eye Medium+ Medium Medium
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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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

Gamma Cas, 4.50 - 4.62V, amp. 0.3:R, 1.1679d.
CPM. Companion F8.
1033d. K 19.0, V0 -18.7, asini 268.
Cas-Tau OB1. Member of Pleiades group.
Shell star. Also classified B2V, B4ne, B8III, B2-5IVe.

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 185
Easy
Elliptical galaxy
Galaxy mag 9.2 1.0° Cassiopeia
NGC 281
Medium+
Emission nebula — try an OIII filter
Emission Nebula mag 7.0 8.4° Cassiopeia
M76
Little Dumbbell Nebula
Hard+
Planetary nebula — try an OIII filter
Planetary Nebula mag 10.1 9.8° Perseus
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