Phi UMa
HIP 48402; Phi UMa; 30 UMa
DoubleStar
UMa
Visible
Level 5
Expert level - Requires steady seeing
Physical Properties
Magnitude
4.59
Spectral Type
A3IV
Star Color
White
(B-V 0.03)
Distance
101.9 ly
Position & Identifiers
RA
09h 52m 06.4s
Dec
+54° 03' 52.0"
Constellation
UMa
HR
3894
HIP
48402
Bayer
Phi
Flamsteed
30 UMa
Double Cat
7545
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Visibility
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Multiple Star System
Separation
0.4″
Companion Mag
5.4
Position Angle
316°
Star Colors
A: White
B: Yellow-white
Discoverer
STT 208
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 0.4″ · PA: 316° · 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
5.30 A3IV, 5.38 A3IV, 105.5y, a = 0.360". Combined mag., colors.
Possible Eggen group with HR 63, q.v.
0.008".
Survey Image
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