Phi Dra
HIP 89908; Phi Dra; 43 Dra
DoubleStar
Dra
Visible
Level 5
Expert level - Requires steady seeing
Physical Properties
Magnitude
4.22
Variable Type
Alpha2 CVn (Magnetic Rotating)
Spectral Type
A0pSi:
Star Color
Blue-white
(B-V -0.10)
Distance
271.8 ly
Position & Identifiers
RA
18h 20m 45.5s
Dec
+71° 20' 16.0"
Constellation
Dra
HR
6920
HIP
89908
Bayer
Phi
Flamsteed
43 Dra
Variable ID
Phi Dra
Double Cat
11311
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Visibility
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Multiple Star System
Components
3
Component IDs
AB
Separation
0.5″
Companion Mag
5.9
Companion Sp
B9V
Position Angle
262°
Star Colors
A: Blue-white
B: Blue-white
Discoverer
STT 353
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 0.5″ · PA: 262° · 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
Alpha CV, amp. 0.04V, 1.71646d. Same rotation period.
4.4, 6.1v, 271.7y, a = 0.392".
26.768d, K 26.6k/s, V0 -20.8k/s, asini 9.02.
Also classified B8Vp.
0.003".
Survey Image
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