Theta CrB
HIP 76127; Theta CrB; 4 CrB
DoubleStar
CrB
Visible
Level 5
Expert level - Requires steady seeing
Physical Properties
Magnitude
4.14
Variable Type
Eclipsing Binary (Algol-type)
Spectral Type
B6Vnne
Star Color
Blue-white
(B-V -0.13)
Distance
120.8 ly
Position & Identifiers
RA
15h 32m 55.8s
Dec
+31° 21' 33.0"
Constellation
CrB
HR
5778
HIP
76127
Bayer
Theta
Flamsteed
4 CrB
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Visibility
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Multiple Star System
Separation
0.8″
Companion Mag
6.3
Position Angle
198°
Star Colors
A: Blue-white
B: Yellow-white
Discoverer
COU 610
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 0.8″ · PA: 198° · 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
Component A is NSV 7134, 4.12V, amp. 0.7m. However, 1300 UBV observations on 57 nights (1984-6) revealed no variation | over 0.06 mag. R-I also found at -0.16. Component B, the rarely seen companion, is NSV 7135, 5.5, 7.8v.
Member of the local association (Pleiades group).
Primary probably not variable and velocity probably constant.
Survey Image
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