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
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
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Visibility
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Comparison Stars for 71 Dra
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
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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