15 Sgr

HIP 89439; 15 Sgr DoubleStar Sgr Visible Level 6 Professional/Research - Requires steady seeing

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Physical Properties

Magnitude 5.38

Spectral Type B0Ia

Star Color White (B-V 0.07)

Position & Identifiers

RA 18h 15m 12.9s

Dec -20° 43' 42.0"

Constellation Sgr

HR 6822

HIP 89439

Flamsteed 15 Sgr

Visibility

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Multiple Star System

Separation 1.3″

Companion Mag 10.6

Position Angle 77°

Star Colors A: White B: Yellow

Discoverer TOK 59

Eyepiece View

Telescope Eyepiece

80x Dawes: 1.9″ TFOV: 0.6°

Seeing

Scale Realistic = true angular size

Sep: 1.3″ · PA: 77° · 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

Group/Cluster

Sgr OB7; exciting star of HII region S35; NGC 6526. Also classified O9.7Iab.

Survey Image

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