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Secunda Hyadum

HIP 20455; Delta1 Tau; 61 Tau

HIP 20455; Delta1 Tau; 61 Tau DoubleStar Tau Visible Level 3 Medium telescope (6-8") - Requires steady seeing
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Physical Properties

Magnitude 3.76
Spectral Type G9.5III CN0.5
Star Color Orange (B-V 0.98)
Distance 155.3 ly

Position & Identifiers

RA 04h 22m 56.1s
Dec +17° 32' 33.0"
Constellation Tau
HR 1373
HIP 20455
Bayer Delta1
Flamsteed 61 Tau

Visibility

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Multiple Star System

Components 3
Component IDs AB
Separation 112.6″
Companion Mag 13.2
Position Angle 336°
Star Colors A: Orange
Discoverer BUP 55

Eyepiece View

80x Dawes: 1.9″ TFOV: 0.6°
Realistic = true angular size
N E 336° A (3.8) B (13.2)

Sep: 112.6″ · PA: 336° · N up, E left

Resolved · 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

Amp. 0.1V.
529.8d, K 3.0k/s, V0 +39.5k/s, asini 19.8. D. W. Dunham indicates 3.9, 13.0v, sep. 0.04".
In Taurus cluster; Mel 25 #41; the Hyades.
Hyadum II.

Survey Image

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