Theta Boo

HIP 70497; Theta Boo; 23 Boo DoubleStar Boo Visible Level 3 Medium telescope (6-8") - Requires steady seeing

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Physical Properties

Magnitude 4.05

Spectral Type F7V

Star Color Yellow (B-V 0.50)

Distance 45.3 ly

Position & Identifiers

RA 14h 25m 11.8s

Dec +51° 51' 03.0"

Constellation Boo

HR 5404

HIP 70497

Bayer Theta

Flamsteed 23 Boo

Visibility

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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

Telescope Eyepiece

80x Dawes: 1.9″ TFOV: 0.6°

Seeing

Scale 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 Notes

Double Star

CPM.

Group/Cluster

Wolf 630 group; NGC 457.

Alternative Names

Asellus Primus.

Survey Image

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