Polis
HIP 89341; Mu Sgr; 13 Sgr
HIP 89341; Mu Sgr; 13 Sgr
DoubleStar
Sgr
Visible
Level 3
Medium telescope (6-8") - Requires steady seeing
Physical Properties
Magnitude
3.86
Variable Type
Eclipsing Binary (Algol-type)
Spectral Type
B8Iab(e)
Star Color
Yellow-white
(B-V 0.23)
Distance
36239.6 ly
Position & Identifiers
RA
18h 13m 45.8s
Dec
-21° 03' 32.0"
Constellation
Sgr
HR
6812
HIP
89341
Bayer
Mu
Flamsteed
13 Sgr
Variable ID
Mu Sgr
Double Cat
11169
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Visibility
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Multiple Star System
Components
6
Separation
16.9″
Companion Mag
10.5
Position Angle
258°
Star Colors
A: Yellow-white
Discoverer
H 5 7
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 16.9″ · PA: 258° · N up, E left
Resolved · 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 11169A, EA 3.79 - 3.92V, 180.45d. Also irregular changes in brightness.
ADS 11169A is SB, 4.1, 7.0v, sep. 0.011". Closest visual companion is B, 11.5v, B9III at 17"; C is 13.5v at 26"; | D, 9.9v, B3; E, 9.4v, B2V, physical, vsini 184k/s.
ADS 11169A, 180.45d, K 56.8k/s, V0 -2.7k/s, asini 129.
Sgr OB1.
Shell star.
Survey Image
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