Dubhe
HIP 54061; Alpha UMa; 50 UMa
HIP 54061; Alpha UMa; 50 UMa
DoubleStar
UMa
Visible
Level 6
Professional/Research - Requires steady seeing
Physical Properties
Magnitude
1.79
Spectral Type
G8III
Star Color
Orange
(B-V 1.07)
Distance
123.0 ly
Position & Identifiers
RA
11h 03m 43.7s
Dec
+61° 45' 03.0"
Constellation
UMa
HR
4301
HIP
54061
Bayer
Alpha
Flamsteed
50 UMa
Double Cat
8035
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Visibility
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Multiple Star System
Separation
0.8″
Companion Mag
5.0
Position Angle
342°
Star Colors
A: Orange
Discoverer
BU 1077
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 0.8″ · PA: 342° · 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
ADS 8035A; B also var. suspect NSV 5071, too close to primary to be certain of variability.
1.87 K0III, 4.81 F0V, 44.4y, a = 0.603". Also classified K0II-III + A8V:. Combined mag., colors. Also CPM at 280" | with HD 95638 = GC 15179, 7.12V F8; SB, 6.04d.
44.0y, K 2.0k/s, V0 -8.7k/s, asini 414. Unresolved by speckle interferometry.
Balloon-borne spectrometer revealed pronounced emission of MgII.
0.039".
DUBHE; Dubb; Ak.
Survey Image
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