Alula Australis
HR 4375; Xi UMa; 53 UMa
Observable Double Star
Excellent (71/100)
Sep: 3.1", Companion: mag 4.8
HR 4375; Xi UMa; 53 UMa
DoubleStar
UMa
Visible
Level 3
Medium telescope (6-8") - Requires steady seeing
Physical Properties
Magnitude
4.41
Spectral Type
G0V
Star Color
Yellow
(B-V 0.59)
Distance
23.8 ly
Position & Identifiers
RA
11h 18m 11.0s
Dec
+31° 31' 45.0"
Constellation
UMa
HR
4375
Bayer
Xi
Flamsteed
53 UMa
Double Cat
8119
Visibility
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Multiple Star System
Components
4
Component IDs
AB
Separation
3.1″
Companion Mag
4.8
Companion Sp
G9V
Position Angle
135°
Star Colors
A: Yellow
B: Orange
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 3.1″ · PA: 135° · N up, E left
Resolved · Rayleigh: 2.3″ · Dawes: 1.9″ · Eff: 3.1″
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
See HR 4374.
AB 4.32 G0V, 4.79 G0V, 59.840y, a = 2.530". Combined colors. Mag. for blend 3.79V. AB, first visual double for which an | orbit determined, in 1828 by Savary. Third component astrometric with A, 1.832y, a = 0.055".
ADS 8119A, 669.18d, K 8.0k/s, V0 -15.0k/s, asini 62.4. SB same per. as orbital astrometric binary AP. Resolved | by speckle interferometry.
0.120".
Alula Australis.
Survey Image
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