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Psi Persei — Star in Perseus

Magnitude 4.2–4.4m Star Perseus (Per) Visible
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1Physical Properties

Magnitude 4.23
Range 4.17 - 4.36
Variable Type Gamma Cassiopeiae (Eruptive Be Star)
Spectral Type B5Ve
Star Color Blue (B-V -0.06)

2Position & Identifiers

RA 03h 36m 29.4s
Dec +48° 11' 34.0"
Constellation Perseus (Per)
HR 1087
HIP 16826
HD 22192
SAO 38980
Bayer Psi
Flamsteed 37 Per
Variable ID Psi Per
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 Oct – Dec (peak: Nov)

5Survey Image

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7

Size Comparison

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8

Compare Stars

9

Spectral Classification

10

Hertzsprung-Russell Diagram

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Read: The Hertzsprung-Russell Diagram — Reading Stars Like a Map
11

Stellar Lifecycle

12

Blackbody Spectrum

13

Stellar Absorption Spectrum

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

14

Stellar Fusion

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15Stellar Notes

Amp. 0.04V, 0.5d. Hydrogen emission variable. Expanding circumstellar shell.
Mel 20 #1164; Per OB3; member of Pleiades group. Nonmember of Alpha Per cluster on basis of RV.
Shell star.
Rotationally unstable shell star.

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.

Mirfak
Alpha Per
Easy
Bright naked-eye star, mag 1.8
Star mag 1.79 2.6° Perseus
Alpha Persei Cluster
Easy
Open cluster
Open Cluster mag 1.2 2.6° Perseus
NGC 1278
Hard+
Elliptical galaxy
Galaxy mag 12.6 7.2° Perseus
Algol
HIP 14576; Beta Persei; 26 Persei
Easy
Eclipsing binary, period 2.9d
Variable Star mag 2.12 8.8° Perseus
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