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V918 Scorpii — Star in Scorpius

Magnitude 5.5m Star Scorpius (Sco) Visible
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1Physical Properties

Magnitude 5.47
Range 5.42 - 5.50
Period 9.8 days
Variable Type Ellipsoidal Variable
Spectral Type O9Ia supergiant
Star Color Yellow-white (B-V 0.40)

2Position & Identifiers

RA 16h 36m 22.5s
Dec -42° 51' 32.0"
Constellation Scorpius (Sco)
HR 6164
HIP 81305
HD 149404
SAO 226953
Variable ID V918 Sco
SIMBAD

3How easy to spot?

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Equipment Bortle 3 Bortle 4 Bortle 5
Naked eye Medium Hard+ Hard
50mm finder Easy Easy Easy
150mm scope Easy Easy Easy
Easy Medium Hard Very hard Impossible

Bortle 3 = rural · 4 = outer suburbs · 5 = suburbs

4Visibility

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Best season Apr – Jun (peak: May)

5Survey Image

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6

Size Comparison

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7

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8

Spectral Classification

9

Hertzsprung-Russell Diagram

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Read: The Hertzsprung-Russell Diagram — Reading Stars Like a Map
10

Stellar Lifecycle

11

Blackbody Spectrum

12

Stellar Absorption Spectrum

Simulated absorption spectrum based on spectral type. Hover over lines to identify elements.

13

Stellar Fusion

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14Stellar Notes

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

Nearby in the Sky

Other targets within a few degrees — pan your scope a little and keep exploring.

Visibility scores assume a 150 mm Newton at Bortle 4.

NGC 6192
Easy
Open cluster
Open Cluster mag 9.0 0.9° Scorpius
V919 Sco
Easy
Wolf-Rayet star — rare, hot emission spectrum
Star mag 6.49 3.1° Scorpius
V861 Sco
Medium
Eclipsing binary, period 7.8d
Variable Star mag 6.15 4.3° Scorpius
NGC 6139
Easy
Globular cluster — dense ball of ancient stars
Globular Cluster mag 9.2 4.3° Scorpius
Epsilon Nor
Easy
Easy double, sep 22.9″
Double Star mag 4.47 5.0° Norma
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