Alrakis
HIP 83608; Mu Dra; 21 Dra
Observable Double Star
Excellent (61/100)
Sep: 2.0", Companion: mag 5.7
HIP 83608; Mu Dra; 21 Dra
DoubleStar
Dra
Visible
Level 3
Medium telescope (6-8") - Requires steady seeing
Physical Properties
Magnitude
5.80
Spectral Type
F7V
Star Color
Yellow
(B-V 0.48)
Distance
70.9 ly
Position & Identifiers
RA
17h 05m 19.7s
Dec
+54° 28' 13.0"
Constellation
Dra
HR
6370
HIP
83608
Bayer
Mu
Flamsteed
21 Dra
Double Cat
10345
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Visibility
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Multiple Star System
Components
3
Component IDs
AB
Separation
2.0″
Companion Mag
5.7
Position Angle
354°
Star Colors
A: Yellow
B: Yellow
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 2.0″ · PA: 354° · 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
AB 5.65, 5.70, combined spectrum F7V, 672y, a = 3.945" or 472.07y, a = 3.143", masses 1.3, 1.3 solar. Combined colors. | Mag. for blend, 4.92V. C, 13v at 14" physical: revolution about AB on order 4000y.
Blended with HR 6369.
0.039".
Arrakis; Errakis; Al Rakis; El Rakis.
Survey Image
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