Theta Ori
HIP 26221; Theta1 Ori; 41 Ori
HIP 26221; Theta1 Ori; 41 Ori
DoubleStar
Ori
Visible
Level 3
Medium telescope (6-8") - Requires steady seeing
Physical Properties
Magnitude
5.13
Spectral Type
O6p
Star Color
White
(B-V 0.02)
Distance
3261.6 ly
Position & Identifiers
RA
05h 35m 16.5s
Dec
-05° 23' 23.0"
Constellation
Ori
HR
1895
HIP
26221
Bayer
Theta1
Flamsteed
41 Ori
Double Cat
4186
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Visibility
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Multiple Star System
Components
12
Component IDs
*
Separation
117.0″
Companion Mag
16.2
Position Angle
32°
Star Colors
A: White
B: White
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 117.0″ · PA: 32° · 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
5.10 - 5.16V. He II 4686 suggests var. density of infalling material on time scale of days.
See HR 1893. Fixed with HR 1896 at 13".
Inverse P Cyg profile suggests infalling material rather than SB.
Abnormal reddening at 1500A. Color excess E(B-V) = +0.32. Morel and Magenat indicate R-I from -0.13 to 0.00 in | disagreement with other Johnson sources.
Ori OB1d; sword of Orion; a trapezium star. Orion Neb, NGC 1976, HII reg.
Interstellar Lyman alpha absorption observed by AEROBEE rocket. Also classified O6ep, O7Vp, O6.5III.
Survey Image
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