Theta Ret
Observable Double Star
Good (53/100)
Sep: 4.1", Companion: mag 7.7
HIP 20020; Theta Ret
DoubleStar
Ret
Visible
Level 3
Medium telescope (6-8") - Requires steady seeing
Physical Properties
Magnitude
5.87
Spectral Type
B9III-IV
Star Color
Blue-white
(B-V -0.07)
Position & Identifiers
RA
04h 17m 40.2s
Dec
-63° 15' 20.0"
Constellation
Ret
HR
1372
HIP
20020
Bayer
Theta
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Visibility
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Multiple Star System
Separation
4.1″
Companion Mag
7.7
Position Angle
2°
Star Colors
A: Blue-white
B: Yellow-white
Discoverer
RMK 3
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 4.1″ · PA: 2° · 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.
Survey Image
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