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HIP 21408

HIP 21408 DoubleStar Tau Visible Level 6 Professional/Research - Requires steady seeing
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Physical Properties

Magnitude 6.36
Spectral Type G5II-III+A-F

Position & Identifiers

RA 04h 35m 42.7s
Dec +19° 52' 54.0"
Constellation Tau
HR 1455
HIP 21408
Double Cat 3316

Visibility

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Multiple Star System

Separation 0.1″
Companion Mag 7.4
Position Angle 134°
Discoverer L 4

Eyepiece View

80x Dawes: 1.9″ TFOV: 0.6°
Realistic = true angular size
N E 134° A (6.4) B (7.4)

Sep: 0.1″ · PA: 134° · N up, E left

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

Size Comparison

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Stellar Lifecycle

Spectral Classification

Blackbody Spectrum

Stellar Absorption Spectrum

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

Stellar Notes

Visual duplicity questioned. Unresolved by speckle interferometry 1983.93.

Survey Image

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