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71 Dra

Observable Variable Star Excellent (62/100)

Period: 5.3d, Type: EA

HIP 100221; 71 Dra VariableStar Dra Visible Level 3 Medium telescope (6-8") - Monitor brightness changes
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Physical Properties

Magnitude 5.72
Variable Type Eclipsing Binary (Algol-type)
Spectral Type B9V
Star Color Blue-white (B-V -0.05)

Position & Identifiers

RA 20h 19m 36.7s
Dec +62° 15' 27.0"
Constellation Dra
HR 7792
HIP 100221
Flamsteed 71 Dra
Variable ID DE Dra

Visibility

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Comparison Stars

Nearby stable stars for estimating brightness (AAVSO)

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Multiple Star System

Separation 0.3″
Companion Mag 8.1
Position Angle 347°
Star Colors A: Blue-white B: Yellow-white
Discoverer GUL 2

Eyepiece View

80x Dawes: 1.9″ TFOV: 0.6°
Realistic = true angular size
N E 347° A (5.7) B (8.1)

Sep: 0.3″ · PA: 347° · 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

EA amp. 0.15V, 5.298036d.
ADS 12214, 18.75y, a = 0.153".
5.298111d, K 49.7k/s, V0 -7.8k/s, asini 3.62. Alternate orbit 5.29807d, K 53.8k/s, V0 -1.1k/s, asini 3.92.
Radio emission.

Survey Image

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