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54 Eri

HIP 21763; 54 Eri DoubleStar Eri Visible Level 6 Professional/Research - Requires steady seeing
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Physical Properties

Magnitude 4.32
Range 4.28 - 4.38
Period 30.000 days
Variable Type Semi-Regular Variable (Late-type Giant)
Spectral Type M4III
Star Color Red (B-V 1.61)
Distance 407.7 ly

Position & Identifiers

RA 04h 40m 26.5s
Dec -19° 40' 18.0"
Constellation Eri
HR 1496
HIP 21763
Flamsteed 54 Eri
Variable ID DM Eri
Double Cat 3380

Visibility

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Light Curve

Multiple Star System

Separation 0.1″
Companion Mag 5.4
Position Angle 135°
Star Colors A: Red
Discoverer STN 9

Eyepiece View

80x Dawes: 1.9″ TFOV: 0.6°
Realistic = true angular size
N E 135° A (4.3) B (5.4)

Sep: 0.1″ · PA: 135° · N up, E left

Unresolved · Rayleigh: 2.3″ · Dawes: 1.9″ · Eff: 3.1″

Size Comparison

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Stellar Lifecycle

Spectral Classification

Hertzsprung-Russell Diagram

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Blackbody Spectrum

Stellar Absorption Spectrum

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

Stellar Notes

SRb 4.28 - 4.36V, 30d.
Seen as double only in 1877 and 1923.

Survey Image

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