55 UMa
HIP 55266; 55 UMa
DoubleStar
UMa
Visible
Level 6
Professional/Research - Requires steady seeing
Physical Properties
Magnitude
4.78
Spectral Type
A1Vp:
Star Color
White
(B-V 0.12)
Distance
130.5 ly
Position & Identifiers
RA
11h 19m 07.9s
Dec
+38° 11' 08.0"
Constellation
UMa
HR
4380
HIP
55266
Flamsteed
55 UMa
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Visibility
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Multiple Star System
Separation
0.1″
Companion Mag
5.3
Position Angle
127°
Star Colors
A: White
Discoverer
CHR 133
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 0.1″ · PA: 127° · 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
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Stellar Notes
2.55385d, K 80.4k/s, V0 -4.6k/s, asini 2.54. Insufficient broad-line velocities determined to permit two-component | solution; however, velocities consistent with mass ratio of about 0.9 (Lloyd 1981).
Lambda Boo star, Mg 4481 wk:
Survey Image
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