39 Dra
Observable Double Star
Good (58/100)
Sep: 3.7", Companion: mag 8.1
HIP 90156; 39 Dra
DoubleStar
Dra
Visible
Level 4
Large telescope (10"+) - Requires steady seeing
Physical Properties
Magnitude
4.98
Spectral Type
A1V
Star Color
White
(B-V 0.08)
Distance
93.2 ly
Position & Identifiers
RA
18h 23m 54.5s
Dec
+58° 48' 02.0"
Constellation
Dra
HR
6923
HIP
90156
Flamsteed
39 Dra
Double Cat
11336
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Visibility
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Multiple Star System
Components
8
Component IDs
AB
Separation
3.7″
Companion Mag
8.1
Position Angle
347°
Star Colors
A: White
B: Yellow
Discoverer
STF2323
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 3.7″ · PA: 347° · 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
AB binary with slow orbital motion. Combined mag., colors. B is A5p, vsini 80k/s. C, 7.1v F6V at 90" CPM. Some | discordance whether B or C is the brighter.
ADS 11336A.
Metal weak.
0.013".
Survey Image
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