Theta Crt

HIP 56633; Theta Crt; 21 Crt DoubleStar Crt Visible Level 3 Medium telescope (6-8") - Requires steady seeing

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Physical Properties

Magnitude 4.70

Spectral Type B9.5Vn

Star Color Blue-white (B-V -0.08)

Position & Identifiers

RA 11h 36m 40.9s

Dec -09° 48' 08.0"

Constellation Crt

HR 4468

HIP 56633

Bayer Theta

Flamsteed 21 Crt

Visibility

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Multiple Star System

Separation 177.8″

Companion Mag 17.9

Position Angle 279°

Star Colors A: Blue-white

Discoverer GWP1622

Eyepiece View

Telescope Eyepiece

32x Dawes: 1.9″ TFOV: 1.6°

Seeing

Scale Realistic = true angular size

Sep: 177.8″ · PA: 279° · 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

Spectroscopic Binary

About 150d.

Survey Image

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