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55 UMa

HIP 55266; 55 UMa DoubleStar UMa Visible Level 6 Professional/Research - Requires steady seeing
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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

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
N E 127° A (4.8) B (5.3)

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

Simulated absorption spectrum based on spectral type. Hover over lines to identify elements.

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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