Theta Boo
HIP 70497; Theta Boo; 23 Boo
DoubleStar
Boo
Visible
Level 3
Medium telescope (6-8") - Requires steady seeing
Physical Properties
Magnitude
4.05
Range
4.04 - 4.06
Period
2.9 days
Variable Type
ROT
Spectral Type
F7V
Star Color
Yellow
(B-V 0.50)
Distance
45 ly
Position & Identifiers
RA
14h 25m 11.8s
Dec
+51° 51' 03.0"
Constellation
Boo
HR
5404
HIP
70497
Bayer
Theta
Flamsteed
23 Boo
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Visibility
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Light Curve
Multiple Star System
Separation
69.4″
Companion Mag
11.5
Companion Sp
M2.5V
Position Angle
182°
Star Colors
A: Yellow
B: Red
Discoverer
STT 580
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 69.4″ · PA: 182° · 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 Fusion
Stellar Notes
CPM.
Wolf 630 group; NGC 457.
Asellus Primus.
Survey Image
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