V918 Sco

HIP 81305 DoubleStar Sco Visible Level 4 Large telescope (10"+) - Requires steady seeing

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Physical Properties

Magnitude 5.47

Spectral Type O9Ia

Star Color Yellow-white (B-V 0.40)

Position & Identifiers

RA 16h 36m 22.5s

Dec -42° 51' 32.0"

Constellation Sco

HR 6164

HIP 81305

Variable ID V918 Sco

Visibility

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Multiple Star System

Separation 6.8″

Companion Mag 11.4

Position Angle 120°

Star Colors A: Yellow-white

Discoverer SNA 42

Eyepiece View

Telescope Eyepiece

80x Dawes: 1.9″ TFOV: 0.6°

Seeing

Scale Realistic = true angular size

Sep: 6.8″ · PA: 120° · 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

9.813d, k1 101k/s, K2 60k/s, V1 -37k/s, V2 -28k/s, m1sin3i 1.6, m2sin3i 2.7, | a1sini 13.7, a2sini 8.1.

Group/Cluster

Ara OB1a. Listed by Buscombe and Kennedy (M.N.R.A.S. 124, 196, 1962) as among Sco-Cen stars. Buscombe now points out | that it is a nonmember background star.

Spectral

H alpha emission.

Radial Velocity

Two available determinations of vsini, 140 and 45k/s.

Survey Image

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