Sigma Ori
HIP 26549; Sigma Ori; 48 Ori
DoubleStar
Ori
Visible
Level 5
Expert level - Requires steady seeing
Physical Properties
Magnitude
3.81
Spectral Type
O9.5V
Star Color
Blue
(B-V -0.24)
Distance
950.3 ly
Position & Identifiers
RA
05h 38m 44.8s
Dec
-02° 36' 00.0"
Constellation
Ori
HR
1931
HIP
26549
Bayer
Sigma
Flamsteed
48 Ori
Double Cat
4241
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Visibility
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Multiple Star System
Components
5
Component IDs
AB
Separation
0.3″
Companion Mag
5.3
Companion Sp
B?
Position Angle
239°
Star Colors
A: Blue
B: Blue
Discoverer
BU 1032
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 0.3″ · PA: 239° · 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
AB 4.1 O9.5V, 5.1 B0.5V, 170y, a = 0.247". Combined mag. and colors. C, 8.79V, A2V at 11" may be physical; D, 6.62V, | -0.20(B-V), B2V, at 13" and E = HR 1932, at 42" CPM with A. A multiple system similar to trapezium. ADS 4241 possibly | the most massive visual binary known, 35 solar masses.
Ori OB1b1; Orion belt; HII reg.; IC 434; a trapezium system.
Hydrogen deficient. Interstellar Lyman alpha absorption observed by AEROBEE rocket.
0.003".
Survey Image
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