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47 Dra

Observable Double Star Good (58/100)

Sep: 37.6", Companion: mag 8.3

HIP 92512; 47 Dra DoubleStar Dra Visible Level 2 Small telescope (4") - Requires steady seeing
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Physical Properties

Magnitude 4.66
Spectral Type G9IIIFe-0.5
Star Color Red (B-V 1.19)
Distance 543.6 ly

Position & Identifiers

RA 18h 51m 12.1s
Dec +59° 23' 18.0"
Constellation Dra
HR 7125
HIP 92512
Flamsteed 47 Dra
Variable ID Omi Dra
Double Cat 11779

Visibility

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Multiple Star System

Components 3
Component IDs AB
Separation 37.6″
Companion Mag 8.3
Position Angle 316°
Star Colors A: Red
Discoverer STF2420

Eyepiece View

80x Dawes: 1.9″ TFOV: 0.6°
Realistic = true angular size
N E 316° A (4.7) B (8.3)

Sep: 37.6″ · PA: 316° · 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

B is K3IIIp optical, vsini =<54k/s. C, 11.5v at 139" is receding from A.
ADS 11799A, 138.420d, K 23.5k/s, V0 -19.5k/s, asini 44.5. Companion possibly early type.

Survey Image

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