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Zeta Andromedae — Star in Andromeda

Magnitude 3.9–4.1m Star Andromeda (And) Visible
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1Physical Properties

Magnitude 4.06
Range 3.92 - 4.14
Period 17.8 days
Variable Type Ellipsoidal Variable
Spectral Type K1IIe supergiant
Star Color Orange (B-V 1.12)
Distance 88 ly

2Position & Identifiers

RA 00h 47m 20.3s
Dec +24° 16' 02.0"
Constellation Andromeda (And)
HR 215
HIP 3693
HD 4502
SAO 74267
Bayer Zeta
Flamsteed 34 And
Variable ID Zet And

3How easy to spot?

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Equipment Bortle 3 Bortle 4 Bortle 5
Naked eye Easy 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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7

Size Comparison

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8

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9

Spectral Classification

10

Hertzsprung-Russell Diagram

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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

Component A of visual system, EB 3.92 - 4.14V, 17.7695d.
AB CPM. Companions probably optical.
Component A of visual system, 17.7692d, K 26.3k/s, V0 -23.7k/s, asini 6.43. Possible X-ray source 3U0032+24.
CaII emission.
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Light Travel Time Machine

17

Relativistic Travel

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