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Eta Andromedae — Star in Andromeda

Magnitude 4.4m Star Andromeda (And) Visible
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1Physical Properties

Magnitude 4.42
Spectral Type G8IIIb bright giant
Star Color Orange (B-V 0.94)
Distance 362 ly

2Position & Identifiers

RA 00h 57m 12.4s
Dec +23° 25' 03.0"
Constellation Andromeda (And)
HR 271
HIP 4463
HD 5516
SAO 74388
Bayer Eta
Flamsteed 38 And
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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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

115.71d, K 17.9k/s, V0 -10.3k/s, msin3i 0.338, asini 28.5; both components vsini <17k/s.
UMa stream.
16

Light Travel Time Machine

17

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.

36 And
Hard+
Tight double — a rewarding split at 1.1″
Double Star mag 5.47 0.6° Andromeda
NGC 160
Hard+
Bright spiral galaxy
Galaxy mag 12.4 4.9° Andromeda
47 Psc
Medium+
Semi-regular variable, range 4.7–5.4
Variable Star mag 5.06 8.8° Pisces
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